ECC Class

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The ECC (Elliptic Curve Cryptography) class implements ECDSA, EdDSA, ECDH, and ECIES operations.

Syntax

ECC

Remarks

The ECC (Elliptic Curve Cryptography) class implements ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm), ECDH (Elliptic Curve Diffie Hellman), and ECIES (Elliptic Curve Integrated Encryption Scheme) operations. The class supports the following common operations:

• CreateKey allows key creation using algorithms such as secp256r1, secp384r1, secp521r1, X25519, X448, Ed25519, Ed448, and more.
• ComputeSecret computes a shared secret between two parties using a public and private key (ECDH).
• Sign and VerifySignature provides a way to digitally sign data and verify signatures (ECDSA and EdDSA).
• Encrypt and Decrypt encrypt and decrypt data using a public and private key (ECIES).

The class is very flexible and offers many properties and configuration settings to configure it. The sections below detail the use of the class for each of the major operations listed above.

Key Creation and Management

CreateKey creates a new public and private key.

When this method is called, Key is populated with the generated key. The PublicKey and PrivateKey fields hold the PEM formatted public and private key for ease of use. This is helpful for storing or transporting keys more easily.

The KeyAlgorithm parameter specifies the algorithm for which the key is intended to be used. Possible values are:

NIST, Koblitz, and Brainpool Curve Notes

Keys for use with NIST curves (secp256r1, secp384r1, secp521r1), Koblitz curves (secp160k1, secp192k1, secp224k1, secp256k1), and Brainpool curves are made up of a number of individual parameters.

The public key consists of the following parameters:

• Rx
• Ry

The private key consists of one value:

• K

Curve25519 and Curve448 Notes

Keys for use with Curve25519 or Curve448 are made up of a private key and public key field.

XPk holds the public key.

XSk holds the private key.

Create Key Example (secp256r1 - PEM)

//Create a key using secp256r1 Ecc ecc = new Ecc(); ecc.CreateKey("secp256r1"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1" string privKey = ecc.Key.PrivateKey; //PEM formatted key string pubKey = ecc.Key.PublicKey; //PEM formatted key //Load the saved key ecc.Reset(); ecc.Key.PublicKey = pubKey; ecc.Key.PrivateKey = privKey; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1"

Create Key Example (secp256r1 - Raw Key Params)

//Create a key using secp256r1 and store/load the key using the individual params Ecc ecc = new Ecc(); ecc.CreateKey("secp256r1"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1" byte[] K = ecc.Key.KB; //Private key param byte[] Rx = ecc.Key.RxB; //Public key param byte[] Ry = ecc.Key.RyB; //Public key param //Load the saved key ecc.Reset(); ecc.Key.Algorithm = ECAlgorithms.eaSecp256r1; //This MUST be set manually when using key params directly ecc.Key.KB = K; ecc.Key.RxB = Rx; ecc.Key.RyB = Ry; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1"

Create Key Example (Ed25519 - PEM)

//Create a key using Ed25519 Ecc ecc = new Ecc(); ecc.CreateKey("Ed25519"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519" string privKey = ecc.Key.PrivateKey; //PEM formatted key string pubKey = ecc.Key.PublicKey; //PEM formatted key //Load the saved key ecc.Reset(); ecc.Key.PublicKey = pubKey; ecc.Key.PrivateKey = privKey; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519"

Create Key Example (Ed25519 - Raw Key Params)

//Create a key using Ed25519 and store/load the key using the individual params Ecc ecc = new Ecc(); ecc.CreateKey("Ed25519"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519" byte[] XPk = ecc.Key.XPkB; //Public key data byte[] XSk = ecc.Key.XSkB; //Secret key data //Load the saved key ecc.Reset(); ecc.Key.Algorithm = ECAlgorithms.eaEd25519; //This MUST be set manually when using key params directly ecc.Key.XPkB = XPk; ecc.Key.XSkB = XSk; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519"

Compute Secret (ECDH)

This method computes a shared secret using Elliptic Curve Diffie Hellman (ECDH).

When this method is called, the class will use the public key specified by PublicKey and the private key specified by Key to compute a shared secret, or secret agreement. The ComputeSecretKDF property specifies the Hash or HMAC algorithm that is applied to the raw secret. The resulting value is held by SharedSecret. The following properties are applicable when calling this method:

• Key (required)
• PublicKey (required)
• ComputeSecretKDF (optional)

See ComputeSecretKDF for details on advanced settings that may be applicable for the chosen algorithm.

Keys created with the Ed25519 and Ed448 algorithms are not supported when calling this method.

Compute Secret Example

//Create a key for Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("X25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Create a key for Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("X25519"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Note: the public keys must be exchanged between parties by some mechanism //Create the shared secret on Party 1 ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; //Private key of this party ecc1.RecipientKey.PublicKey = ecc2_pub; //Public key of other party ecc1.UseHex = true; //Hex encodes the shared secret bytes for easier display/storage ecc1.ComputeSecret(); Console.WriteLine(ecc1.SharedSecret); //Create the shared secret on Party 2 ecc2.Reset(); ecc2.Key.PrivateKey = ecc2_priv; //Private key of this party ecc2.RecipientKey.PublicKey = ecc1_pub; //Public key of other party ecc2.UseHex = true; //Hex encodes the shared secret bytes for easier display/storage ecc2.ComputeSecret(); Console.WriteLine(ecc2.SharedSecret); //This will match the shared secret created by ecc1.

Signing (ECDSA and EdDSA)

Sign will create a hash signature using ECDSA or EdDSA. The class will use the key specified by Key to hash the input data and sign the resulting hash.

Key must contain a private key created with a valid ECDSA or EdDSA algorithm. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for signing are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves
• Ed25519 and Ed448

See CreateKey for details about key creation and algorithms.

When this method is called, data will be read from the InputFile or InputMessage.

The hash to be signed will be computed using the specified HashAlgorithm. The computed hash is stored in the HashValue property. The signed hash is stored in the HashSignature property.

To sign a hash without first computing it, set HashValue to a previously computed hash for the input data. Note: HashValue is not applicable when signing with a PureEdDSA algorithm such as Ed25519 or Ed448.

The Progress event will fire with updates for the hash computation progress only. The hash signature creation process is quick and does not require progress updates.

After calling Sign, the public key must be sent to the recipient along with HashSignature and the original input data so the other party may perform signature verification.

The following properties are applicable when calling this method:

• Key (required)
• HashAlgorithm (applicable to ECDSA only)
• HashEdDSA (applicable to EdDSA only)
• HashValue (not applicable to PureEdDSA)
• UseHex

The following properties are populated after calling this method:

• HashValue
• HashSignature

When the Algorithm is Ed25519 or Ed448, the following additional parameters are applicable:

• HashEdDSA
• EdDSAContext

EdDSA keys can be used with a PureEdDSA algorithm (Ed25519/Ed448) or a HashEdDSA (Ed25519ph, Ed448ph) algorithm. This is controlled by the HashEdDSA property. By default, the class uses the PureEdDSA algorithm.

The PureEdDSA algorithm requires two passes over the input data but provides collision resilience. The collision resilience of PureEdDSA means that even if it is feasible to compute collisions for the hash function, the algorithm is still secure. When using PureEdDSA, HashValue is not applicable.

When using a HashEdDSA algorithm, the input is pre-hashed and supports a single pass over the data during the signing operation. To enable HashEdDSA, set HashEdDSA to True.

To specify context data when using Ed25519 or Ed448, set EdDSAContext.

Sign And Verify Example (ECDSA)

//Create an ECDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("secp256r1"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - PureEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - HashEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.HashEdDSA = true; //Use "ed25519ph" ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.HashEdDSA = true; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Verifying (ECDSA and EdDSA)

VerifySignature will verify a hash signature and return True if successful or False otherwise.

Before calling this method, specify the input file by setting InputFile or InputMessage.

A public key and the hash signature are required to perform the signature verification. Specify the public key in SignerKey. Specify the hash signature in HashSignature.

When this method is called, the class will compute the hash for the specified file and populate HashValue. It will verify the signature using the specified SignerKey and HashSignature.

To verify the hash signature without first computing the hash, simply specify HashValue before calling this method. Note: HashValue is not applicable when the message was signed with a PureEdDSA algorithm such as Ed25519 or Ed448.

The Progress event will fire with updates for the hash computation progress only. The hash signature verification process is quick and does not require progress updates.

The following properties are applicable when calling this method:

• HashSignature (required)
• SignerKey (required)
• EdDSAContext (applicable to EdDSA only)
• HashAlgorithm (applicable to ECDSA only)
• HashEdDSA (applicable to EdDSA only)
• HashValue (not applicable to PureEdDSA)
• UseHex

Sign And Verify Example (ECDSA)

//Create an ECDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("secp256r1"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - PureEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - HashEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.HashEdDSA = true; //Use "ed25519ph" ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.HashEdDSA = true; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Encrypting (ECIES)

Encrypt encrypts the specified data with the ECDSA public key specified in RecipientKey.

Encryption is performed using ECIES which requires an ECDSA key. RecipientKey must contain an ECDSA key. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for encryption are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves

See CreateKey for details about key creation and algorithms.

When this method is called, the class will encrypt the specified data using ECIES and the encrypted data will be output. To hex encode the output, set UseHex to True.

The following properties are applicable when calling this method:

• EncryptionAlgorithm
• HMACAlgorithm
• HMACOptionalInfo
• HMACKeySize
• IV
• KDF
• KDFHashAlgorithm
• KDFOptionalInfo
• UseHex

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Encrypt and Decrypt Example

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (AES with IV)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); //Use an IV (16 bytes for AES) - In a real environment this should be random byte[] IV = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc1.IVB = IV; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message and the IV to Party 2 //Decrypt the message using the private key for Party 2 and the IV ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc2.IVB = IV; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (XOR Encryption Algorithm)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (KDF Options)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.KDF = "KDF1"; //Use KDF1 ecc1.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc1.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); //Hex encoded string ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.KDF = "KDF1"; ecc2.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc2.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Decrypting (ECIES)

Decrypt decrypts the specified data with the ECDSA private key specified in Key.

Decryption is performed using ECIES which requires an ECDSA key. Key must contain an ECDSA key. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for encryption are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves

See CreateKey for details about key creation and algorithms.

When this method is called, the class will decrypt the specified data using ECIES and the decrypted data will be output. If the input data was originally hex encoded, set UseHex to True.

The following properties are applicable when calling this method:

• EncryptionAlgorithm
• HMACAlgorithm
• HMACOptionalInfo
• HMACKeySize
• IV
• KDF
• KDFHashAlgorithm
• KDFOptionalInfo
• UseHex

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Encrypt and Decrypt Example

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (AES with IV)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); //Use an IV (16 bytes for AES) - In a real environment this should be random byte[] IV = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc1.IVB = IV; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message and the IV to Party 2 //Decrypt the message using the private key for Party 2 and the IV ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc2.IVB = IV; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (XOR Encryption Algorithm)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (KDF Options)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.KDF = "KDF1"; //Use KDF1 ecc1.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc1.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); //Hex encoded string ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.KDF = "KDF1"; ecc2.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc2.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Property List

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the class with short descriptions. Click on the links for further details.

Certificate Property (ECC Class)

The certificate used for signing and decryption.

Syntax

• C++
• C
• Qt

IPWorksEncryptCertificate* GetCertificate();
int SetCertificate(IPWorksEncryptCertificate* val);

char* ipworksencrypt_ecc_getcerteffectivedate(void* lpObj);

char* ipworksencrypt_ecc_getcertexpirationdate(void* lpObj);

char* ipworksencrypt_ecc_getcertextendedkeyusage(void* lpObj);

char* ipworksencrypt_ecc_getcertfingerprint(void* lpObj);

char* ipworksencrypt_ecc_getcertfingerprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getcertfingerprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getcertissuer(void* lpObj);

char* ipworksencrypt_ecc_getcertprivatekey(void* lpObj);

int ipworksencrypt_ecc_getcertprivatekeyavailable(void* lpObj);

char* ipworksencrypt_ecc_getcertprivatekeycontainer(void* lpObj);

char* ipworksencrypt_ecc_getcertpublickey(void* lpObj);

char* ipworksencrypt_ecc_getcertpublickeyalgorithm(void* lpObj);

int ipworksencrypt_ecc_getcertpublickeylength(void* lpObj);

char* ipworksencrypt_ecc_getcertserialnumber(void* lpObj);

char* ipworksencrypt_ecc_getcertsignaturealgorithm(void* lpObj);

int ipworksencrypt_ecc_getcertstore(void* lpObj, char** lpCertStore, int* lenCertStore);
int ipworksencrypt_ecc_setcertstore(void* lpObj, const char* lpCertStore, int lenCertStore);

char* ipworksencrypt_ecc_getcertstorepassword(void* lpObj);
int ipworksencrypt_ecc_setcertstorepassword(void* lpObj, const char* lpszCertStorePassword);

int ipworksencrypt_ecc_getcertstoretype(void* lpObj);
int ipworksencrypt_ecc_setcertstoretype(void* lpObj, int iCertStoreType);

char* ipworksencrypt_ecc_getcertsubjectaltnames(void* lpObj);

char* ipworksencrypt_ecc_getcertthumbprintmd5(void* lpObj);

char* ipworksencrypt_ecc_getcertthumbprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getcertthumbprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getcertusage(void* lpObj);

int ipworksencrypt_ecc_getcertusageflags(void* lpObj);

char* ipworksencrypt_ecc_getcertversion(void* lpObj);

char* ipworksencrypt_ecc_getcertsubject(void* lpObj);
int ipworksencrypt_ecc_setcertsubject(void* lpObj, const char* lpszCertSubject);

int ipworksencrypt_ecc_getcertencoded(void* lpObj, char** lpCertEncoded, int* lenCertEncoded);
int ipworksencrypt_ecc_setcertencoded(void* lpObj, const char* lpCertEncoded, int lenCertEncoded);

QString GetCertEffectiveDate();

QString GetCertExpirationDate();

QString GetCertExtendedKeyUsage();

QString GetCertFingerprint();

QString GetCertFingerprintSHA1();

QString GetCertFingerprintSHA256();

QString GetCertIssuer();

QString GetCertPrivateKey();

bool GetCertPrivateKeyAvailable();

QString GetCertPrivateKeyContainer();

QString GetCertPublicKey();

QString GetCertPublicKeyAlgorithm();

int GetCertPublicKeyLength();

QString GetCertSerialNumber();

QString GetCertSignatureAlgorithm();

QByteArray GetCertStore();
int SetCertStore(QByteArray qbaCertStore);

QString GetCertStorePassword();
int SetCertStorePassword(QString qsCertStorePassword);

int GetCertStoreType();
int SetCertStoreType(int iCertStoreType);

QString GetCertSubjectAltNames();

QString GetCertThumbprintMD5();

QString GetCertThumbprintSHA1();

QString GetCertThumbprintSHA256();

QString GetCertUsage();

int GetCertUsageFlags();

QString GetCertVersion();

QString GetCertSubject();
int SetCertSubject(QString qsCertSubject);

QByteArray GetCertEncoded();
int SetCertEncoded(QByteArray qbaCertEncoded);

Remarks

This property specifies a certificate with a private key.

This may be set instead of Key, allowing a Certificate object to be used instead of a ECCKey object. This certificate is used when calling Sign and Decrypt. The specified certificate must have a private key.

If both this property and Key are specified, Key will be used and this property will be ignored.

Data Type

IPWorksEncryptCertificate

ComputeSecretKDF Property (ECC Class)

The key derivation function.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetComputeSecretKDF();
int SetComputeSecretKDF(int iComputeSecretKDF);

Unicode (Windows)
INT GetComputeSecretKDF();
INT SetComputeSecretKDF(INT iComputeSecretKDF);

EKD_SHA1(0), 
EKD_SHA256(1), 
EKD_SHA384(2), 
EKD_SHA512(3), 
EKD_MD2(4), 
EKD_MD4(5), 
EKD_MD5(6), 
EKD_HMACSHA1(7), 
EKD_HMACSHA256(8), 
EKD_HMACSHA384(9), 
EKD_HMACSHA512(10), 
EKD_HMACMD5(11), 
EKD_TLS(12), 
EKD_CONCAT(13)

int ipworksencrypt_ecc_getcomputesecretkdf(void* lpObj);
int ipworksencrypt_ecc_setcomputesecretkdf(void* lpObj, int iComputeSecretKDF);

int GetComputeSecretKDF();
int SetComputeSecretKDF(int iComputeSecretKDF);

Default Value

1

Remarks

This property specifies the key derivation function (KDF) and algorithm to use when calling ComputeSecret.

Possible values are:

HMAC Notes

If an HMAC algorithm is selected, HMACKey may optionally be set to specify the key.

TLS Notes

When set to TLS, TLSSeed and TLSLabel are required. In addition, PrependSecret and AppendSecret are not applicable.

Concat Notes

If Concat is selected, the following configuration settings are applicable:

• ConcatAlgorithmId (required)
• ConcatPartyUInfo (required)
• ConcatPartyVInfo (required)
• ConcatSuppPubInfo
• ConcatSuppPrivInfo
• ConcatHashAlgorithm

Data Type

Integer

EncryptionAlgorithm Property (ECC Class)

The encryption algorithm to use.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetEncryptionAlgorithm();
int SetEncryptionAlgorithm(int iEncryptionAlgorithm);

Unicode (Windows)
INT GetEncryptionAlgorithm();
INT SetEncryptionAlgorithm(INT iEncryptionAlgorithm);

IES_AES(0), 
IES_TRIPLE_DES(1), 
IES_XOR(2)

int ipworksencrypt_ecc_getencryptionalgorithm(void* lpObj);
int ipworksencrypt_ecc_setencryptionalgorithm(void* lpObj, int iEncryptionAlgorithm);

int GetEncryptionAlgorithm();
int SetEncryptionAlgorithm(int iEncryptionAlgorithm);

Default Value

0

Remarks

This setting specifies the encryption algorithm to use when Encrypt is called. This must also be set before calling Decrypt to match the algorithm used during the initial encryption.

Possible values are:

• 0 (iesAES - default)
• 1 (iesTripleDES)
• 2 (iesXOR)

AES Notes

Data Type

Integer

HashAlgorithm Property (ECC Class)

The hash algorithm used for hash computation.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetHashAlgorithm();
int SetHashAlgorithm(int iHashAlgorithm);

Unicode (Windows)
INT GetHashAlgorithm();
INT SetHashAlgorithm(INT iHashAlgorithm);

EHA_SHA1(0), 
EHA_SHA224(1), 
EHA_SHA256(2), 
EHA_SHA384(3), 
EHA_SHA512(4), 
EHA_MD2(5), 
EHA_MD4(6), 
EHA_MD5(7), 
EHA_MD5SHA1(8), 
EHA_RIPEMD160(9)

int ipworksencrypt_ecc_gethashalgorithm(void* lpObj);
int ipworksencrypt_ecc_sethashalgorithm(void* lpObj, int iHashAlgorithm);

int GetHashAlgorithm();
int SetHashAlgorithm(int iHashAlgorithm);

Default Value

2

Remarks

This property specifies the hash algorithm used for hash computation. This is only applicable when calling Sign or VerifySignature and Algorithm specifies a ECDSA key (NIST, Koblitz, or Brainpool curve). Possible values are:

When Algorithm specifies an EdDSA key, this setting is not applicable as the hash algorithm is defined by the specification as SHA-512 for Ed25519 and SHAKE-256 for Ed448.

Data Type

Integer

HashEdDSA Property (ECC Class)

Whether to use HashEdDSA when signing with an Ed25519 or Ed448 key.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetHashEdDSA();
int SetHashEdDSA(int bHashEdDSA);

Unicode (Windows)
BOOL GetHashEdDSA();
INT SetHashEdDSA(BOOL bHashEdDSA);

int ipworksencrypt_ecc_gethasheddsa(void* lpObj);
int ipworksencrypt_ecc_sethasheddsa(void* lpObj, int bHashEdDSA);

bool GetHashEdDSA();
int SetHashEdDSA(bool bHashEdDSA);

Default Value

FALSE

Remarks

This setting specifies whether to use the HashEdDSA algorithm when signing and verifying with Ed25519 or Ed448 keys.

If set to True, the class will use the HashEdDSA algorithm (Ed25519ph or Ed448ph) when signing and verifying. When using a HashEdDSA algorithm, the input is pre-hashed and supports a single pass over the data during the signing operation.

If set to False (default), the class will use the PureEdDSA algorithm (Ed25519 or Ed448) when signing. The PureEdDSA requires two passes over the input data but provides collision resilience. The collision resilience of PureEdDSA means that even if it is feasible to compute collisions for the hash function, the algorithm is still secure.

This property is only applicable when calling Sign and Algorithm is set to Ed25519 or Ed448.

If this property is set before calling Sign, it must be set before calling VerifySignature.

Data Type

Boolean

HashSignature Property (ECC Class)

The hash signature.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetHashSignature(char* &lpHashSignature, int &lenHashSignature);
int SetHashSignature(const char* lpHashSignature, int lenHashSignature);

Unicode (Windows)
INT GetHashSignature(LPSTR &lpHashSignature, INT &lenHashSignature);
INT SetHashSignature(LPCSTR lpHashSignature, INT lenHashSignature);

int ipworksencrypt_ecc_gethashsignature(void* lpObj, char** lpHashSignature, int* lenHashSignature);
int ipworksencrypt_ecc_sethashsignature(void* lpObj, const char* lpHashSignature, int lenHashSignature);

QByteArray GetHashSignature();
int SetHashSignature(QByteArray qbaHashSignature);

Default Value

""

Remarks

This property holds the computed hash signature. This is populated after calling Sign. This must be set before calling VerifySignature.

Data Type

Binary String

HashValue Property (ECC Class)

The hash value of the data.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetHashValue(char* &lpHashValue, int &lenHashValue);
int SetHashValue(const char* lpHashValue, int lenHashValue);

Unicode (Windows)
INT GetHashValue(LPSTR &lpHashValue, INT &lenHashValue);
INT SetHashValue(LPCSTR lpHashValue, INT lenHashValue);

int ipworksencrypt_ecc_gethashvalue(void* lpObj, char** lpHashValue, int* lenHashValue);
int ipworksencrypt_ecc_sethashvalue(void* lpObj, const char* lpHashValue, int lenHashValue);

QByteArray GetHashValue();
int SetHashValue(QByteArray qbaHashValue);

Default Value

""

Remarks

This property holds the computed hash value for the specified data. This is populated when calling Sign or VerifySignature when an input file is specified by setting InputFile or InputMessage.

Pre-existing hash values may be set to this property before calling Sign or VerifySignature. If you know the hash value prior to using the class, you may specify the pre-computed hash value here.

This setting is not applicable to PureEdDSA algorithms. If Algorithm is Ed25519 or Ed448 and HashEdDSA is False (default), the PureEdDSA algorithm is used and HashValue is not applicable.

Hash Notes

The class will determine whether or not to recompute the hash based on the properties that are set. If a file is specified by InputFile or InputMessage, the hash will be recomputed when calling Sign or VerifySignature. If the HashValue property is set, the class will only sign the hash or verify the hash signature. Setting InputFile or InputMessage clears the HashValue property. Setting the HashValue property clears the input file selection.

Data Type

Binary String

HMACAlgorithm Property (ECC Class)

The HMAC algorithm to use during encryption.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetHMACAlgorithm();
int SetHMACAlgorithm(int iHMACAlgorithm);

Unicode (Windows)
INT GetHMACAlgorithm();
INT SetHMACAlgorithm(INT iHMACAlgorithm);

IES_HMACSHA1(0), 
IES_HMACSHA224(1), 
IES_HMACSHA256(2), 
IES_HMACSHA384(3), 
IES_HMACSHA512(4), 
IES_HMACRIPEMD160(5)

int ipworksencrypt_ecc_gethmacalgorithm(void* lpObj);
int ipworksencrypt_ecc_sethmacalgorithm(void* lpObj, int iHMACAlgorithm);

int GetHMACAlgorithm();
int SetHMACAlgorithm(int iHMACAlgorithm);

Default Value

2

Remarks

This property specifies the HMAC algorithm to use when encrypting. The HMAC algorithm is used when Encrypt and Decrypt are called to protect and verify data. Possible values are:

• 0 (iesHMACSHA1)
• 1 (iesHMACSHA224)
• 2 (iesHMACSHA256 - Default)
• 3 (iesHMACSHA384)
• 4 (iesHMACSHA512)
• 5 (iesHMACRIPEMD160)

This property is only applicable when calling Encrypt or Decrypt.

Data Type

Integer

InputFile Property (ECC Class)

The file to process.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetInputFile();
int SetInputFile(const char* lpszInputFile);

Unicode (Windows)
LPWSTR GetInputFile();
INT SetInputFile(LPCWSTR lpszInputFile);

char* ipworksencrypt_ecc_getinputfile(void* lpObj);
int ipworksencrypt_ecc_setinputfile(void* lpObj, const char* lpszInputFile);

QString GetInputFile();
int SetInputFile(QString qsInputFile);

Default Value

""

Remarks

This property specifies the file to be processed. Set this property to the full or relative path to the file which will be processed.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Data Type

String

InputMessage Property (ECC Class)

The message to process.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetInputMessage(char* &lpInputMessage, int &lenInputMessage);
int SetInputMessage(const char* lpInputMessage, int lenInputMessage);

Unicode (Windows)
INT GetInputMessage(LPSTR &lpInputMessage, INT &lenInputMessage);
INT SetInputMessage(LPCSTR lpInputMessage, INT lenInputMessage);

int ipworksencrypt_ecc_getinputmessage(void* lpObj, char** lpInputMessage, int* lenInputMessage);
int ipworksencrypt_ecc_setinputmessage(void* lpObj, const char* lpInputMessage, int lenInputMessage);

QByteArray GetInputMessage();
int SetInputMessage(QByteArray qbaInputMessage);

Default Value

""

Remarks

This property specifies the message to be processed.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Data Type

Binary String

IV Property (ECC Class)

The initialization vector (IV) used when encrypting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetIV(char* &lpIV, int &lenIV);
int SetIV(const char* lpIV, int lenIV);

Unicode (Windows)
INT GetIV(LPSTR &lpIV, INT &lenIV);
INT SetIV(LPCSTR lpIV, INT lenIV);

int ipworksencrypt_ecc_getiv(void* lpObj, char** lpIV, int* lenIV);
int ipworksencrypt_ecc_setiv(void* lpObj, const char* lpIV, int lenIV);

QByteArray GetIV();
int SetIV(QByteArray qbaIV);

Default Value

""

Remarks

This property optionally specifies an IV to be used when calling Encrypt or Decrypt. If specified, the IV is used by EncryptionAlgorithm during encryption.

If not specified, the class will create an IV filled with null bytes (zeros). Since the encryption key is only used once, the use of null bytes in the IV is considered acceptable and is a standard practice.

The length of the IV should be as follows:

This setting is not applicable when EncryptionAlgorithm is set to XOR.

Data Type

Binary String

KDF Property (ECC Class)

The key derivation function used during encryption and decryption.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetKDF();
int SetKDF(const char* lpszKDF);

Unicode (Windows)
LPWSTR GetKDF();
INT SetKDF(LPCWSTR lpszKDF);

char* ipworksencrypt_ecc_getkdf(void* lpObj);
int ipworksencrypt_ecc_setkdf(void* lpObj, const char* lpszKDF);

QString GetKDF();
int SetKDF(QString qsKDF);

Default Value

"KDF2"

Remarks

This property specifies the key derivation function (KDF) to use when encrypting and decrypting. Possible values are:

• "KDF1"
• "KDF2" (default)

This property is only applicable when calling Encrypt or Decrypt.

Data Type

String

KDFHashAlgorithm Property (ECC Class)

The KDF hash algorithm to use when encrypting and decrypting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetKDFHashAlgorithm();
int SetKDFHashAlgorithm(int iKDFHashAlgorithm);

Unicode (Windows)
INT GetKDFHashAlgorithm();
INT SetKDFHashAlgorithm(INT iKDFHashAlgorithm);

IES_SHA1(0), 
IES_SHA224(1), 
IES_SHA256(2), 
IES_SHA384(3), 
IES_SHA512(4)

int ipworksencrypt_ecc_getkdfhashalgorithm(void* lpObj);
int ipworksencrypt_ecc_setkdfhashalgorithm(void* lpObj, int iKDFHashAlgorithm);

int GetKDFHashAlgorithm();
int SetKDFHashAlgorithm(int iKDFHashAlgorithm);

Default Value

2

Remarks

This property specifies the hash algorithm to use when deriving a key using the specified KDF. Possible values are:

• 0 (iesSHA1)
• 1 (iesSHA224)
• 2 (iesSHA256)
• 3 (iesSHA384)
• 4 (iesSHA512)

This property is only applicable when calling Encrypt or Decrypt.

Data Type

Integer

Key Property (ECC Class)

The ECC key.

Syntax

• C++
• C
• Qt

IPWorksEncryptECCKey* GetKey();
int SetKey(IPWorksEncryptECCKey* val);

int ipworksencrypt_ecc_getkeyalgorithm(void* lpObj);
int ipworksencrypt_ecc_setkeyalgorithm(void* lpObj, int iKeyAlgorithm);

int ipworksencrypt_ecc_getkeyk(void* lpObj, char** lpKeyK, int* lenKeyK);
int ipworksencrypt_ecc_setkeyk(void* lpObj, const char* lpKeyK, int lenKeyK);

char* ipworksencrypt_ecc_getkeyprivatekey(void* lpObj);
int ipworksencrypt_ecc_setkeyprivatekey(void* lpObj, const char* lpszKeyPrivateKey);

char* ipworksencrypt_ecc_getkeypublickey(void* lpObj);
int ipworksencrypt_ecc_setkeypublickey(void* lpObj, const char* lpszKeyPublicKey);

int ipworksencrypt_ecc_getkeyrx(void* lpObj, char** lpKeyRx, int* lenKeyRx);
int ipworksencrypt_ecc_setkeyrx(void* lpObj, const char* lpKeyRx, int lenKeyRx);

int ipworksencrypt_ecc_getkeyry(void* lpObj, char** lpKeyRy, int* lenKeyRy);
int ipworksencrypt_ecc_setkeyry(void* lpObj, const char* lpKeyRy, int lenKeyRy);

int ipworksencrypt_ecc_getkeyxpk(void* lpObj, char** lpKeyXPk, int* lenKeyXPk);
int ipworksencrypt_ecc_setkeyxpk(void* lpObj, const char* lpKeyXPk, int lenKeyXPk);

int ipworksencrypt_ecc_getkeyxsk(void* lpObj, char** lpKeyXSk, int* lenKeyXSk);
int ipworksencrypt_ecc_setkeyxsk(void* lpObj, const char* lpKeyXSk, int lenKeyXSk);

int GetKeyAlgorithm();
int SetKeyAlgorithm(int iKeyAlgorithm);

QByteArray GetKeyK();
int SetKeyK(QByteArray qbaKeyK);

QString GetKeyPrivateKey();
int SetKeyPrivateKey(QString qsKeyPrivateKey);

QString GetKeyPublicKey();
int SetKeyPublicKey(QString qsKeyPublicKey);

QByteArray GetKeyRx();
int SetKeyRx(QByteArray qbaKeyRx);

QByteArray GetKeyRy();
int SetKeyRy(QByteArray qbaKeyRy);

QByteArray GetKeyXPk();
int SetKeyXPk(QByteArray qbaKeyXPk);

QByteArray GetKeyXSk();
int SetKeyXSk(QByteArray qbaKeyXSk);

Remarks

This property specifies the ECC private key. This property must be set before calling Sign or ComputeSecret.

NIST, Koblitz, and Brainpool Curve Notes

Keys for use with NIST curves (secp256r1, secp384r1, secp521r1), Koblitz curves (secp160k1, secp192k1, secp224k1, secp256k1), and Brainpool curves are made up of a number of individual parameters.

The public key consists of the following parameters:

• Rx
• Ry

The private key consists of one value:

• K

Curve25519 and Curve448 Notes

Keys for use with Curve25519 or Curve448 are made up of a private key and public key field.

XPk holds the public key.

XSk holds the private key.

Data Type

IPWorksEncryptECCKey

OutputFile Property (ECC Class)

The output file when encrypting or decrypting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetOutputFile();
int SetOutputFile(const char* lpszOutputFile);

Unicode (Windows)
LPWSTR GetOutputFile();
INT SetOutputFile(LPCWSTR lpszOutputFile);

char* ipworksencrypt_ecc_getoutputfile(void* lpObj);
int ipworksencrypt_ecc_setoutputfile(void* lpObj, const char* lpszOutputFile);

QString GetOutputFile();
int SetOutputFile(QString qsOutputFile);

Default Value

""

Remarks

This property specifies the file to which the output will be written when Encrypt or Decrypt is called. This may be set to an absolute or relative path.

This property is only applicable to Encrypt and Decrypt.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Data Type

String

OutputMessage Property (ECC Class)

The output message when encrypting or decrypting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetOutputMessage(char* &lpOutputMessage, int &lenOutputMessage);

Unicode (Windows)
INT GetOutputMessage(LPSTR &lpOutputMessage, INT &lenOutputMessage);

int ipworksencrypt_ecc_getoutputmessage(void* lpObj, char** lpOutputMessage, int* lenOutputMessage);

QByteArray GetOutputMessage();

Default Value

""

Remarks

This property will be populated with the output after calling Encrypt or Decrypt if OutputFile is not set.

This property is only applicable to Encrypt and Decrypt.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

This property is read-only and not available at design time.

Data Type

Binary String

Overwrite Property (ECC Class)

Indicates whether or not the class should overwrite files.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetOverwrite();
int SetOverwrite(int bOverwrite);

Unicode (Windows)
BOOL GetOverwrite();
INT SetOverwrite(BOOL bOverwrite);

int ipworksencrypt_ecc_getoverwrite(void* lpObj);
int ipworksencrypt_ecc_setoverwrite(void* lpObj, int bOverwrite);

bool GetOverwrite();
int SetOverwrite(bool bOverwrite);

Default Value

FALSE

Remarks

This property indicates whether or not the class will overwrite OutputFile. If Overwrite is False, an error will be thrown whenever OutputFile exists before an operation. The default value is False.

Data Type

Boolean

RecipientCert Property (ECC Class)

The certificate used for encryption and computing a shared secret.

Syntax

• C++
• C
• Qt

IPWorksEncryptCertificate* GetRecipientCert();
int SetRecipientCert(IPWorksEncryptCertificate* val);

char* ipworksencrypt_ecc_getrecipientcerteffectivedate(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertexpirationdate(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertextendedkeyusage(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertfingerprint(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertfingerprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertfingerprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertissuer(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertprivatekey(void* lpObj);

int ipworksencrypt_ecc_getrecipientcertprivatekeyavailable(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertprivatekeycontainer(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertpublickey(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertpublickeyalgorithm(void* lpObj);

int ipworksencrypt_ecc_getrecipientcertpublickeylength(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertserialnumber(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertsignaturealgorithm(void* lpObj);

int ipworksencrypt_ecc_getrecipientcertstore(void* lpObj, char** lpRecipientCertStore, int* lenRecipientCertStore);
int ipworksencrypt_ecc_setrecipientcertstore(void* lpObj, const char* lpRecipientCertStore, int lenRecipientCertStore);

char* ipworksencrypt_ecc_getrecipientcertstorepassword(void* lpObj);
int ipworksencrypt_ecc_setrecipientcertstorepassword(void* lpObj, const char* lpszRecipientCertStorePassword);

int ipworksencrypt_ecc_getrecipientcertstoretype(void* lpObj);
int ipworksencrypt_ecc_setrecipientcertstoretype(void* lpObj, int iRecipientCertStoreType);

char* ipworksencrypt_ecc_getrecipientcertsubjectaltnames(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertthumbprintmd5(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertthumbprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertthumbprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertusage(void* lpObj);

int ipworksencrypt_ecc_getrecipientcertusageflags(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertversion(void* lpObj);

char* ipworksencrypt_ecc_getrecipientcertsubject(void* lpObj);
int ipworksencrypt_ecc_setrecipientcertsubject(void* lpObj, const char* lpszRecipientCertSubject);

int ipworksencrypt_ecc_getrecipientcertencoded(void* lpObj, char** lpRecipientCertEncoded, int* lenRecipientCertEncoded);
int ipworksencrypt_ecc_setrecipientcertencoded(void* lpObj, const char* lpRecipientCertEncoded, int lenRecipientCertEncoded);

QString GetRecipientCertEffectiveDate();

QString GetRecipientCertExpirationDate();

QString GetRecipientCertExtendedKeyUsage();

QString GetRecipientCertFingerprint();

QString GetRecipientCertFingerprintSHA1();

QString GetRecipientCertFingerprintSHA256();

QString GetRecipientCertIssuer();

QString GetRecipientCertPrivateKey();

bool GetRecipientCertPrivateKeyAvailable();

QString GetRecipientCertPrivateKeyContainer();

QString GetRecipientCertPublicKey();

QString GetRecipientCertPublicKeyAlgorithm();

int GetRecipientCertPublicKeyLength();

QString GetRecipientCertSerialNumber();

QString GetRecipientCertSignatureAlgorithm();

QByteArray GetRecipientCertStore();
int SetRecipientCertStore(QByteArray qbaRecipientCertStore);

QString GetRecipientCertStorePassword();
int SetRecipientCertStorePassword(QString qsRecipientCertStorePassword);

int GetRecipientCertStoreType();
int SetRecipientCertStoreType(int iRecipientCertStoreType);

QString GetRecipientCertSubjectAltNames();

QString GetRecipientCertThumbprintMD5();

QString GetRecipientCertThumbprintSHA1();

QString GetRecipientCertThumbprintSHA256();

QString GetRecipientCertUsage();

int GetRecipientCertUsageFlags();

QString GetRecipientCertVersion();

QString GetRecipientCertSubject();
int SetRecipientCertSubject(QString qsRecipientCertSubject);

QByteArray GetRecipientCertEncoded();
int SetRecipientCertEncoded(QByteArray qbaRecipientCertEncoded);

Remarks

This property specifies a certificate for encryption and computing a shared secret.

This may be set instead of RecipientKey, allowing a Certificate object to be used instead of a ECCKey object. This certificate is used when calling Encrypt and ComputeSecret.

If both this property and RecipientKey are specified, RecipientKey will be used and this property will be ignored.

Data Type

IPWorksEncryptCertificate

RecipientKey Property (ECC Class)

The public key used to compute the shared secret.

Syntax

• C++
• C
• Qt

IPWorksEncryptECCKey* GetRecipientKey();
int SetRecipientKey(IPWorksEncryptECCKey* val);

int ipworksencrypt_ecc_getrecipientkeyalgorithm(void* lpObj);
int ipworksencrypt_ecc_setrecipientkeyalgorithm(void* lpObj, int iRecipientKeyAlgorithm);

char* ipworksencrypt_ecc_getrecipientkeypublickey(void* lpObj);
int ipworksencrypt_ecc_setrecipientkeypublickey(void* lpObj, const char* lpszRecipientKeyPublicKey);

int ipworksencrypt_ecc_getrecipientkeyrx(void* lpObj, char** lpRecipientKeyRx, int* lenRecipientKeyRx);
int ipworksencrypt_ecc_setrecipientkeyrx(void* lpObj, const char* lpRecipientKeyRx, int lenRecipientKeyRx);

int ipworksencrypt_ecc_getrecipientkeyry(void* lpObj, char** lpRecipientKeyRy, int* lenRecipientKeyRy);
int ipworksencrypt_ecc_setrecipientkeyry(void* lpObj, const char* lpRecipientKeyRy, int lenRecipientKeyRy);

int ipworksencrypt_ecc_getrecipientkeyxpk(void* lpObj, char** lpRecipientKeyXPk, int* lenRecipientKeyXPk);
int ipworksencrypt_ecc_setrecipientkeyxpk(void* lpObj, const char* lpRecipientKeyXPk, int lenRecipientKeyXPk);

int GetRecipientKeyAlgorithm();
int SetRecipientKeyAlgorithm(int iRecipientKeyAlgorithm);

QString GetRecipientKeyPublicKey();
int SetRecipientKeyPublicKey(QString qsRecipientKeyPublicKey);

QByteArray GetRecipientKeyRx();
int SetRecipientKeyRx(QByteArray qbaRecipientKeyRx);

QByteArray GetRecipientKeyRy();
int SetRecipientKeyRy(QByteArray qbaRecipientKeyRy);

QByteArray GetRecipientKeyXPk();
int SetRecipientKeyXPk(QByteArray qbaRecipientKeyXPk);

Remarks

This property specifies the public key used to compute the shared secret. If RecipientCert is not specified, this must be set before calling ComputeSecret.

Data Type

IPWorksEncryptECCKey

SharedSecret Property (ECC Class)

The computed shared secret.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetSharedSecret(char* &lpSharedSecret, int &lenSharedSecret);

Unicode (Windows)
INT GetSharedSecret(LPSTR &lpSharedSecret, INT &lenSharedSecret);

int ipworksencrypt_ecc_getsharedsecret(void* lpObj, char** lpSharedSecret, int* lenSharedSecret);

QByteArray GetSharedSecret();

Default Value

""

Remarks

This property holds the shared secret computed by ComputeSecret.

This property is read-only.

Data Type

Binary String

SignerCert Property (ECC Class)

The certificate used for signature verification.

Syntax

• C++
• C
• Qt

IPWorksEncryptCertificate* GetSignerCert();
int SetSignerCert(IPWorksEncryptCertificate* val);

char* ipworksencrypt_ecc_getsignercerteffectivedate(void* lpObj);

char* ipworksencrypt_ecc_getsignercertexpirationdate(void* lpObj);

char* ipworksencrypt_ecc_getsignercertextendedkeyusage(void* lpObj);

char* ipworksencrypt_ecc_getsignercertfingerprint(void* lpObj);

char* ipworksencrypt_ecc_getsignercertfingerprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getsignercertfingerprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getsignercertissuer(void* lpObj);

char* ipworksencrypt_ecc_getsignercertprivatekey(void* lpObj);

int ipworksencrypt_ecc_getsignercertprivatekeyavailable(void* lpObj);

char* ipworksencrypt_ecc_getsignercertprivatekeycontainer(void* lpObj);

char* ipworksencrypt_ecc_getsignercertpublickey(void* lpObj);

char* ipworksencrypt_ecc_getsignercertpublickeyalgorithm(void* lpObj);

int ipworksencrypt_ecc_getsignercertpublickeylength(void* lpObj);

char* ipworksencrypt_ecc_getsignercertserialnumber(void* lpObj);

char* ipworksencrypt_ecc_getsignercertsignaturealgorithm(void* lpObj);

int ipworksencrypt_ecc_getsignercertstore(void* lpObj, char** lpSignerCertStore, int* lenSignerCertStore);
int ipworksencrypt_ecc_setsignercertstore(void* lpObj, const char* lpSignerCertStore, int lenSignerCertStore);

char* ipworksencrypt_ecc_getsignercertstorepassword(void* lpObj);
int ipworksencrypt_ecc_setsignercertstorepassword(void* lpObj, const char* lpszSignerCertStorePassword);

int ipworksencrypt_ecc_getsignercertstoretype(void* lpObj);
int ipworksencrypt_ecc_setsignercertstoretype(void* lpObj, int iSignerCertStoreType);

char* ipworksencrypt_ecc_getsignercertsubjectaltnames(void* lpObj);

char* ipworksencrypt_ecc_getsignercertthumbprintmd5(void* lpObj);

char* ipworksencrypt_ecc_getsignercertthumbprintsha1(void* lpObj);

char* ipworksencrypt_ecc_getsignercertthumbprintsha256(void* lpObj);

char* ipworksencrypt_ecc_getsignercertusage(void* lpObj);

int ipworksencrypt_ecc_getsignercertusageflags(void* lpObj);

char* ipworksencrypt_ecc_getsignercertversion(void* lpObj);

char* ipworksencrypt_ecc_getsignercertsubject(void* lpObj);
int ipworksencrypt_ecc_setsignercertsubject(void* lpObj, const char* lpszSignerCertSubject);

int ipworksencrypt_ecc_getsignercertencoded(void* lpObj, char** lpSignerCertEncoded, int* lenSignerCertEncoded);
int ipworksencrypt_ecc_setsignercertencoded(void* lpObj, const char* lpSignerCertEncoded, int lenSignerCertEncoded);

QString GetSignerCertEffectiveDate();

QString GetSignerCertExpirationDate();

QString GetSignerCertExtendedKeyUsage();

QString GetSignerCertFingerprint();

QString GetSignerCertFingerprintSHA1();

QString GetSignerCertFingerprintSHA256();

QString GetSignerCertIssuer();

QString GetSignerCertPrivateKey();

bool GetSignerCertPrivateKeyAvailable();

QString GetSignerCertPrivateKeyContainer();

QString GetSignerCertPublicKey();

QString GetSignerCertPublicKeyAlgorithm();

int GetSignerCertPublicKeyLength();

QString GetSignerCertSerialNumber();

QString GetSignerCertSignatureAlgorithm();

QByteArray GetSignerCertStore();
int SetSignerCertStore(QByteArray qbaSignerCertStore);

QString GetSignerCertStorePassword();
int SetSignerCertStorePassword(QString qsSignerCertStorePassword);

int GetSignerCertStoreType();
int SetSignerCertStoreType(int iSignerCertStoreType);

QString GetSignerCertSubjectAltNames();

QString GetSignerCertThumbprintMD5();

QString GetSignerCertThumbprintSHA1();

QString GetSignerCertThumbprintSHA256();

QString GetSignerCertUsage();

int GetSignerCertUsageFlags();

QString GetSignerCertVersion();

QString GetSignerCertSubject();
int SetSignerCertSubject(QString qsSignerCertSubject);

QByteArray GetSignerCertEncoded();
int SetSignerCertEncoded(QByteArray qbaSignerCertEncoded);

Remarks

This property specifies a certificate for signature verification.

This may be set instead of SignerKey, allowing a Certificate object to be used instead of a ECCKey object. This certificate is used when calling VerifySignature.

If both this property and SignerKey are specified, SignerKey will be used and this property will be ignored.

Data Type

IPWorksEncryptCertificate

SignerKey Property (ECC Class)

The public key used to verify the signature.

Syntax

• C++
• C
• Qt

IPWorksEncryptECCKey* GetSignerKey();
int SetSignerKey(IPWorksEncryptECCKey* val);

int ipworksencrypt_ecc_getsignerkeyalgorithm(void* lpObj);
int ipworksencrypt_ecc_setsignerkeyalgorithm(void* lpObj, int iSignerKeyAlgorithm);

char* ipworksencrypt_ecc_getsignerkeypublickey(void* lpObj);
int ipworksencrypt_ecc_setsignerkeypublickey(void* lpObj, const char* lpszSignerKeyPublicKey);

int ipworksencrypt_ecc_getsignerkeyrx(void* lpObj, char** lpSignerKeyRx, int* lenSignerKeyRx);
int ipworksencrypt_ecc_setsignerkeyrx(void* lpObj, const char* lpSignerKeyRx, int lenSignerKeyRx);

int ipworksencrypt_ecc_getsignerkeyry(void* lpObj, char** lpSignerKeyRy, int* lenSignerKeyRy);
int ipworksencrypt_ecc_setsignerkeyry(void* lpObj, const char* lpSignerKeyRy, int lenSignerKeyRy);

int ipworksencrypt_ecc_getsignerkeyxpk(void* lpObj, char** lpSignerKeyXPk, int* lenSignerKeyXPk);
int ipworksencrypt_ecc_setsignerkeyxpk(void* lpObj, const char* lpSignerKeyXPk, int lenSignerKeyXPk);

int GetSignerKeyAlgorithm();
int SetSignerKeyAlgorithm(int iSignerKeyAlgorithm);

QString GetSignerKeyPublicKey();
int SetSignerKeyPublicKey(QString qsSignerKeyPublicKey);

QByteArray GetSignerKeyRx();
int SetSignerKeyRx(QByteArray qbaSignerKeyRx);

QByteArray GetSignerKeyRy();
int SetSignerKeyRy(QByteArray qbaSignerKeyRy);

QByteArray GetSignerKeyXPk();
int SetSignerKeyXPk(QByteArray qbaSignerKeyXPk);

Remarks

This property specifies the public key used to verify the signature. This public key corresponds to the private key used when creating the signature. This must be set before calling VerifySignature.

Data Type

IPWorksEncryptECCKey

UseHex Property (ECC Class)

Whether binary values are hex encoded.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetUseHex();
int SetUseHex(int bUseHex);

Unicode (Windows)
BOOL GetUseHex();
INT SetUseHex(BOOL bUseHex);

int ipworksencrypt_ecc_getusehex(void* lpObj);
int ipworksencrypt_ecc_setusehex(void* lpObj, int bUseHex);

bool GetUseHex();
int SetUseHex(bool bUseHex);

Default Value

FALSE

Remarks

This setting specifies whether various calculated values are hex encoded. If set to False (default), all data is provided as-is with no encoding.

If set to True, certain properties are hex encoded when populated for ease of display, transport, and storage.

Compute Secret Notes

This property specifies whether SharedSecret is hex encoded when ComputeSecret is called.

Sign and Verify Notes

This property specifies whether HashValue and HashSignature are hex encoded.

If set to True, when Sign is called the class will compute the hash for the specified file and populate HashValue with the hex encoded hash value. It will then create the hash signature and populate HashSignature with the hex encoded hash signature value. If HashValue is specified directly, it must be a hex encoded value.

If set to True, when VerifySignature is called the class will compute the hash value for the specified file and populate HashValue with the hex encoded hash value. It will then hex decode HashSignature and verify the signature. HashSignature must hold a hex encoded value. If HashValue is specified directly, it must be a hex encoded value.

Encrypt and Decrypt Notes

If set to True, when Encrypt is called the class will perform the encryption as normal and then hex encode the output. OutputMessage or OutputFile will hold hex encoded data.

If set to True, when Decrypt is called the class will expect InputMessage or InputFile to hold hex encoded data. The class will then hex decode the data and perform decryption as normal.

Data Type

Boolean

ComputeSecret Method (ECC Class)

Computes a shared secret.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int ComputeSecret();

Unicode (Windows)
INT ComputeSecret();

int ipworksencrypt_ecc_computesecret(void* lpObj);

int ComputeSecret();

Remarks

This method computes a shared secret using Elliptic Curve Diffie Hellman (ECDH).

When this method is called, the class will use the public key specified by PublicKey and the private key specified by Key to compute a shared secret, or secret agreement. The ComputeSecretKDF property specifies the Hash or HMAC algorithm that is applied to the raw secret. The resulting value is held by SharedSecret. The following properties are applicable when calling this method:

• Key (required)
• PublicKey (required)
• ComputeSecretKDF (optional)

See ComputeSecretKDF for details on advanced settings that may be applicable for the chosen algorithm.

Keys created with the Ed25519 and Ed448 algorithms are not supported when calling this method.

Compute Secret Example

//Create a key for Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("X25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Create a key for Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("X25519"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Note: the public keys must be exchanged between parties by some mechanism //Create the shared secret on Party 1 ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; //Private key of this party ecc1.RecipientKey.PublicKey = ecc2_pub; //Public key of other party ecc1.UseHex = true; //Hex encodes the shared secret bytes for easier display/storage ecc1.ComputeSecret(); Console.WriteLine(ecc1.SharedSecret); //Create the shared secret on Party 2 ecc2.Reset(); ecc2.Key.PrivateKey = ecc2_priv; //Private key of this party ecc2.RecipientKey.PublicKey = ecc1_pub; //Public key of other party ecc2.UseHex = true; //Hex encodes the shared secret bytes for easier display/storage ecc2.ComputeSecret(); Console.WriteLine(ecc2.SharedSecret); //This will match the shared secret created by ecc1.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Config Method (ECC Class)

Sets or retrieves a configuration setting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);

char* ipworksencrypt_ecc_config(void* lpObj, const char* lpszConfigurationString);

QString Config(const QString& qsConfigurationString);

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

CreateKey Method (ECC Class)

Creates a new key.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int CreateKey(const char* lpszKeyAlgorithm);

Unicode (Windows)
INT CreateKey(LPCWSTR lpszKeyAlgorithm);

int ipworksencrypt_ecc_createkey(void* lpObj, const char* lpszKeyAlgorithm);

int CreateKey(const QString& qsKeyAlgorithm);

Remarks

CreateKey creates a new public and private key.

When this method is called, Key is populated with the generated key. The PublicKey and PrivateKey fields hold the PEM formatted public and private key for ease of use. This is helpful for storing or transporting keys more easily.

The KeyAlgorithm parameter specifies the algorithm for which the key is intended to be used. Possible values are:

NIST, Koblitz, and Brainpool Curve Notes

Keys for use with NIST curves (secp256r1, secp384r1, secp521r1), Koblitz curves (secp160k1, secp192k1, secp224k1, secp256k1), and Brainpool curves are made up of a number of individual parameters.

The public key consists of the following parameters:

• Rx
• Ry

The private key consists of one value:

• K

Curve25519 and Curve448 Notes

Keys for use with Curve25519 or Curve448 are made up of a private key and public key field.

XPk holds the public key.

XSk holds the private key.

Create Key Example (secp256r1 - PEM)

//Create a key using secp256r1 Ecc ecc = new Ecc(); ecc.CreateKey("secp256r1"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1" string privKey = ecc.Key.PrivateKey; //PEM formatted key string pubKey = ecc.Key.PublicKey; //PEM formatted key //Load the saved key ecc.Reset(); ecc.Key.PublicKey = pubKey; ecc.Key.PrivateKey = privKey; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1"

Create Key Example (secp256r1 - Raw Key Params)

//Create a key using secp256r1 and store/load the key using the individual params Ecc ecc = new Ecc(); ecc.CreateKey("secp256r1"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1" byte[] K = ecc.Key.KB; //Private key param byte[] Rx = ecc.Key.RxB; //Public key param byte[] Ry = ecc.Key.RyB; //Public key param //Load the saved key ecc.Reset(); ecc.Key.Algorithm = ECAlgorithms.eaSecp256r1; //This MUST be set manually when using key params directly ecc.Key.KB = K; ecc.Key.RxB = Rx; ecc.Key.RyB = Ry; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaSecp256r1"

Create Key Example (Ed25519 - PEM)

//Create a key using Ed25519 Ecc ecc = new Ecc(); ecc.CreateKey("Ed25519"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519" string privKey = ecc.Key.PrivateKey; //PEM formatted key string pubKey = ecc.Key.PublicKey; //PEM formatted key //Load the saved key ecc.Reset(); ecc.Key.PublicKey = pubKey; ecc.Key.PrivateKey = privKey; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519"

Create Key Example (Ed25519 - Raw Key Params)

//Create a key using Ed25519 and store/load the key using the individual params Ecc ecc = new Ecc(); ecc.CreateKey("Ed25519"); Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519" byte[] XPk = ecc.Key.XPkB; //Public key data byte[] XSk = ecc.Key.XSkB; //Secret key data //Load the saved key ecc.Reset(); ecc.Key.Algorithm = ECAlgorithms.eaEd25519; //This MUST be set manually when using key params directly ecc.Key.XPkB = XPk; ecc.Key.XSkB = XSk; Console.WriteLine(ecc.Key.Algorithm); //outputs enum value "eaEd25519"

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Decrypt Method (ECC Class)

Decrypted the specified data.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Decrypt();

Unicode (Windows)
INT Decrypt();

int ipworksencrypt_ecc_decrypt(void* lpObj);

int Decrypt();

Remarks

Decrypt decrypts the specified data with the ECDSA private key specified in Key.

Decryption is performed using ECIES which requires an ECDSA key. Key must contain an ECDSA key. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for encryption are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves

See CreateKey for details about key creation and algorithms.

When this method is called, the class will decrypt the specified data using ECIES and the decrypted data will be output. If the input data was originally hex encoded, set UseHex to True.

The following properties are applicable when calling this method:

• EncryptionAlgorithm
• HMACAlgorithm
• HMACOptionalInfo
• HMACKeySize
• IV
• KDF
• KDFHashAlgorithm
• KDFOptionalInfo
• UseHex

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Encrypt and Decrypt Example

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (AES with IV)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); //Use an IV (16 bytes for AES) - In a real environment this should be random byte[] IV = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc1.IVB = IV; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message and the IV to Party 2 //Decrypt the message using the private key for Party 2 and the IV ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc2.IVB = IV; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (XOR Encryption Algorithm)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (KDF Options)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.KDF = "KDF1"; //Use KDF1 ecc1.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc1.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); //Hex encoded string ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.KDF = "KDF1"; ecc2.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc2.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Encrypt Method (ECC Class)

Encrypts the specified data.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Encrypt();

Unicode (Windows)
INT Encrypt();

int ipworksencrypt_ecc_encrypt(void* lpObj);

int Encrypt();

Remarks

Encrypt encrypts the specified data with the ECDSA public key specified in RecipientKey.

Encryption is performed using ECIES which requires an ECDSA key. RecipientKey must contain an ECDSA key. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for encryption are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves

See CreateKey for details about key creation and algorithms.

When this method is called, the class will encrypt the specified data using ECIES and the encrypted data will be output. To hex encode the output, set UseHex to True.

The following properties are applicable when calling this method:

• EncryptionAlgorithm
• HMACAlgorithm
• HMACOptionalInfo
• HMACKeySize
• IV
• KDF
• KDFHashAlgorithm
• KDFOptionalInfo
• UseHex

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Encrypt and Decrypt Example

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (AES with IV)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); //Use an IV (16 bytes for AES) - In a real environment this should be random byte[] IV = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc1.IVB = IV; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message and the IV to Party 2 //Decrypt the message using the private key for Party 2 and the IV ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesAES; ecc2.IVB = IV; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (XOR Encryption Algorithm)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.EncryptionAlgorithm = EccEncryptionAlgorithms.iesXOR; ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Encrypt and Decrypt Example (KDF Options)

//Create an ECDSA key on Party 2 Ecc ecc2 = new Ecc(); ecc2.CreateKey("secp256r1"); string ecc2_priv = ecc2.Key.PrivateKey; string ecc2_pub = ecc2.Key.PublicKey; //Transmit public key to Party 1 //Encrypt the message on Party 1 using public key from Party 2 Ecc ecc1 = new Ecc(); ecc1.KDF = "KDF1"; //Use KDF1 ecc1.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc1.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); //Hex encoded string ecc1.InputMessage = "hello ecc"; ecc1.RecipientKey.PublicKey = ecc2_pub; ecc1.UseHex = true; ecc1.Encrypt(); string encryptedMessage = ecc1.OutputMessage; //Transmit the encrypted message to Party 2 //Decrypt the message using the private key for Party 2 ecc2.KDF = "KDF1"; ecc2.KDFHashAlgorithm = EccKDFHashAlgorithms.iesSHA1; ecc2.Config("KDFOptionalInfo=202122232425262728292a2b2c2d2e2f"); ecc2.Key.PrivateKey = ecc2_priv; ecc2.InputMessage = encryptedMessage; ecc2.UseHex = true; ecc2.Decrypt(); Console.WriteLine(ecc2.OutputMessage);

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Reset Method (ECC Class)

Resets the class.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Reset();

Unicode (Windows)
INT Reset();

int ipworksencrypt_ecc_reset(void* lpObj);

int Reset();

Remarks

When called, the class will reset all of its properties to their default values.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

SetInputStream Method (ECC Class)

Sets the stream from which the class will read data to encrypt or decrypt.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int SetInputStream(IPWorksEncryptStream* sInputStream);

Unicode (Windows)
INT SetInputStream(IPWorksEncryptStream* sInputStream);

int ipworksencrypt_ecc_setinputstream(void* lpObj, IPWorksEncryptStream* sInputStream);

int SetInputStream(IPWorksEncryptStream* sInputStream);

Remarks

This method sets the stream from which the class will read data to encrypt or decrypt.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

SetOutputStream Method (ECC Class)

Sets the stream to which the class will write encrypted or decrypted data.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int SetOutputStream(IPWorksEncryptStream* sOutputStream);

Unicode (Windows)
INT SetOutputStream(IPWorksEncryptStream* sOutputStream);

int ipworksencrypt_ecc_setoutputstream(void* lpObj, IPWorksEncryptStream* sOutputStream);

int SetOutputStream(IPWorksEncryptStream* sOutputStream);

Remarks

This method sets the stream to which the class will write encrypted or decrypted data.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Sign Method (ECC Class)

Creates a hash signature using ECDSA or EdDSA.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Sign();

Unicode (Windows)
INT Sign();

int ipworksencrypt_ecc_sign(void* lpObj);

int Sign();

Remarks

Sign will create a hash signature using ECDSA or EdDSA. The class will use the key specified by Key to hash the input data and sign the resulting hash.

Key must contain a private key created with a valid ECDSA or EdDSA algorithm. Algorithm is used to determine the eligibility of the key for this operation. Supported algorithms for signing are:

• NIST Curves (secp256r1, secp384r1, secp521r1)
• Koblitz Curves (secp160k1, secp192k1, secp224k1, secp256k1)
• Brainpool Curves
• Ed25519 and Ed448

See CreateKey for details about key creation and algorithms.

When this method is called, data will be read from the InputFile or InputMessage.

The hash to be signed will be computed using the specified HashAlgorithm. The computed hash is stored in the HashValue property. The signed hash is stored in the HashSignature property.

To sign a hash without first computing it, set HashValue to a previously computed hash for the input data. Note: HashValue is not applicable when signing with a PureEdDSA algorithm such as Ed25519 or Ed448.

The Progress event will fire with updates for the hash computation progress only. The hash signature creation process is quick and does not require progress updates.

After calling Sign, the public key must be sent to the recipient along with HashSignature and the original input data so the other party may perform signature verification.

The following properties are applicable when calling this method:

• Key (required)
• HashAlgorithm (applicable to ECDSA only)
• HashEdDSA (applicable to EdDSA only)
• HashValue (not applicable to PureEdDSA)
• UseHex

The following properties are populated after calling this method:

• HashValue
• HashSignature

When the Algorithm is Ed25519 or Ed448, the following additional parameters are applicable:

• HashEdDSA
• EdDSAContext

EdDSA keys can be used with a PureEdDSA algorithm (Ed25519/Ed448) or a HashEdDSA (Ed25519ph, Ed448ph) algorithm. This is controlled by the HashEdDSA property. By default, the class uses the PureEdDSA algorithm.

The PureEdDSA algorithm requires two passes over the input data but provides collision resilience. The collision resilience of PureEdDSA means that even if it is feasible to compute collisions for the hash function, the algorithm is still secure. When using PureEdDSA, HashValue is not applicable.

When using a HashEdDSA algorithm, the input is pre-hashed and supports a single pass over the data during the signing operation. To enable HashEdDSA, set HashEdDSA to True.

To specify context data when using Ed25519 or Ed448, set EdDSAContext.

Sign And Verify Example (ECDSA)

//Create an ECDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("secp256r1"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - PureEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - HashEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.HashEdDSA = true; //Use "ed25519ph" ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.HashEdDSA = true; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

VerifySignature Method (ECC Class)

Verifies the signature for the specified data.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
bool VerifySignature();

Unicode (Windows)
INT VerifySignature();

bool ipworksencrypt_ecc_verifysignature(void* lpObj);

bool VerifySignature();

Remarks

VerifySignature will verify a hash signature and return True if successful or False otherwise.

Before calling this method, specify the input file by setting InputFile or InputMessage.

A public key and the hash signature are required to perform the signature verification. Specify the public key in SignerKey. Specify the hash signature in HashSignature.

When this method is called, the class will compute the hash for the specified file and populate HashValue. It will verify the signature using the specified SignerKey and HashSignature.

To verify the hash signature without first computing the hash, simply specify HashValue before calling this method. Note: HashValue is not applicable when the message was signed with a PureEdDSA algorithm such as Ed25519 or Ed448.

The Progress event will fire with updates for the hash computation progress only. The hash signature verification process is quick and does not require progress updates.

The following properties are applicable when calling this method:

• HashSignature (required)
• SignerKey (required)
• EdDSAContext (applicable to EdDSA only)
• HashAlgorithm (applicable to ECDSA only)
• HashEdDSA (applicable to EdDSA only)
• HashValue (not applicable to PureEdDSA)
• UseHex

Sign And Verify Example (ECDSA)

//Create an ECDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("secp256r1"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - PureEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Sign And Verify Example (EdDSA - HashEdDSA)

//Create an EdDSA key on Party 1 Ecc ecc1 = new Ecc(); ecc1.CreateKey("ed25519"); string ecc1_priv = ecc1.Key.PrivateKey; string ecc1_pub = ecc1.Key.PublicKey; //Sign the data on Party 1 string originalData = "hello ecc"; ecc1.Reset(); ecc1.Key.PrivateKey = ecc1_priv; ecc1.InputMessage = originalData; ecc1.UseHex = true; //Hex encode the hash signature for ease of use. ecc1.HashEdDSA = true; //Use "ed25519ph" ecc1.Sign(); string hashSignature = ecc1.HashSignature; //Transmit the hash signature, public key, and original data to Party 2 //Verify the data on Party 2 Ecc ecc2 = new Ecc(); ecc2.SignerKey.PublicKey = ecc1_pub; ecc2.InputMessage = originalData; ecc2.HashSignature = hashSignature; ecc2.HashEdDSA = true; ecc2.UseHex = true; //Decode the hex encoded hash signature bool isVerified = ecc2.VerifySignature();

Error Handling (C++)

This method returns a Boolean value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

Error Event (ECC Class)

Fired when information is available about errors during data delivery.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
virtual int FireError(ECCErrorEventParams *e);

typedef struct {
  int ErrorCode;
  const char *Description;
  int reserved;
} ECCErrorEventParams;


Unicode (Windows)
virtual INT FireError(ECCErrorEventParams *e);

typedef struct {
  INT ErrorCode;
  LPCWSTR Description;
  INT reserved;
} ECCErrorEventParams;

#define EID_ECC_ERROR 1

virtual INT IPWORKSENCRYPT_CALL FireError(INT &iErrorCode, LPSTR &lpszDescription);

class ECCErrorEventParams {
public:
  int ErrorCode();

  const QString &Description();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};

// To handle, connect one or more slots to this signal.
void Error(ECCErrorEventParams *e);

// Or, subclass ECC and override this emitter function.
virtual int FireError(ECCErrorEventParams *e) {...}

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Progress Event (ECC Class)

Fired as progress is made.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
virtual int FireProgress(ECCProgressEventParams *e);

typedef struct {
  int64 BytesProcessed;
  int PercentProcessed;
  int reserved;
} ECCProgressEventParams;


Unicode (Windows)
virtual INT FireProgress(ECCProgressEventParams *e);

typedef struct {
  LONG64 BytesProcessed;
  INT PercentProcessed;
  INT reserved;
} ECCProgressEventParams;

#define EID_ECC_PROGRESS 2

virtual INT IPWORKSENCRYPT_CALL FireProgress(LONG64 &lBytesProcessed, INT &iPercentProcessed);

class ECCProgressEventParams {
public:
  qint64 BytesProcessed();

  int PercentProcessed();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};

// To handle, connect one or more slots to this signal.
void Progress(ECCProgressEventParams *e);

// Or, subclass ECC and override this emitter function.
virtual int FireProgress(ECCProgressEventParams *e) {...}

Remarks

This event is fired automatically as data is processed by the class.

The PercentProcessed parameter indicates the current status of the operation.

The BytesProcessed parameter holds the total number of bytes processed so far.

Certificate Type

This is the digital certificate being used.

Syntax

IPWorksEncryptCertificate (declared in ipworksencrypt.h)

Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

Fields

Constructors

Certificate()

Certificate(const char* lpEncoded, int lenEncoded)

Certificate(int iStoreType, const char* lpStore, int lenStore, const char* lpszStorePassword, const char* lpszSubject)

ECCKey Type

Contains the parameters for the ECC algorithm.

Syntax

IPWorksEncryptECCKey (declared in ipworksencrypt.h)

Remarks

This type is made up of fields that represent the private and public key parameters used by the ECC operations. The PrivateKey and PublicKey parameters hold a PEM formatted value for easy transport and storage of keys.

NIST, Koblitz, and Brainpool Curve Notes

Keys for use with NIST curves (secp256r1, secp384r1, secp521r1), Koblitz curves (secp160k1, secp192k1, secp224k1, secp256k1), and Brainpool curves are made up of a number of individual parameters.

The public key consists of the following parameters:

• Rx
• Ry

The private key consists of one value:

• K

Curve25519 and Curve448 Notes

Keys for use with Curve25519 or Curve448 are made up of a private key and public key field.

XPk holds the public key.

XSk holds the private key.

Fields

Constructors

ECCKey()

ECCKey(const char* lpRx, int lenRx, const char* lpRy, int lenRy, int iAlgorithm)

ECCKey(const char* lpK, int lenK, const char* lpRx, int lenRx, const char* lpRy, int lenRy, int iAlgorithm)

IPWorksEncryptStream Type

Syntax

IPWorksEncryptStream (declared in ipworksencrypt.h)

Remarks

The ECC class includes one or more API members that take a stream object as a parameter. To use such API members, create a concrete class that implements the IPWorksEncryptStream interface and pass the ECC class an instance of that concrete class.

When implementing the IPWorksEncryptStream interface's properties and methods, they must behave as described below. If the concrete class's implementation does not behave as expected, undefined behavior may occur.

bool CanRead() { return true; }

bool CanSeek() { return true; }

bool CanWrite() { return true; }

int64 GetLength() = 0;

void Close() {}

int Flush() { return 0; }

int Read(void* buffer, int count) = 0;

int64 Seek(int64 offset, int seekOrigin) = 0;

int Write(const void* buffer, int count) = 0;

Config Settings (ECC Class)

ECC Config Settings

Base Config Settings

Trappable Errors (ECC Class)

Error Handling (C++)

Call the GetLastErrorCode() method to obtain the last called method's result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

ECC Errors