ECC Component

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

Syntax

TipcECC

Remarks

The ECC (Elliptic Curve Cryptography) component 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 component 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 component is very flexible and offers many properties and configuration settings to configure it. The sections below detail the use of the component 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 properties 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 component 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 component 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 component 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 component 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 component 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 component 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 component 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 component 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

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

Method List

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

Event List

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

Config Settings

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

Certificate Property (ECC Component)

The certificate used for signing and decryption.

Syntax

property Certificate: TipcCertificate read get_Certificate write set_Certificate;

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.

Please refer to the Certificate type for a complete list of fields.

ComputeSecretKDF Property (ECC Component)

The key derivation function.

Syntax

property ComputeSecretKDF: TipcECCComputeSecretKDFs read get_ComputeSecretKDF write set_ComputeSecretKDF;

TipcECCComputeSecretKDFs = (
  ekdSHA1,
  ekdSHA256,
  ekdSHA384,
  ekdSHA512,
  ekdMD2,
  ekdMD4,
  ekdMD5,
  ekdHMACSHA1,
  ekdHMACSHA256,
  ekdHMACSHA384,
  ekdHMACSHA512,
  ekdHMACMD5,
  ekdTLS,
  ekdConcat
);

Default Value

ekdSHA256

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

EncryptionAlgorithm Property (ECC Component)

The encryption algorithm to use.

Syntax

property EncryptionAlgorithm: TipcECCEncryptionAlgorithms read get_EncryptionAlgorithm write set_EncryptionAlgorithm;

TipcECCEncryptionAlgorithms = (
  iesAES,
  iesTripleDES,
  iesXOR
);

Default Value

iesAES

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

When EncryptionAlgorithm is set to iesAES, AES CBC with a default key size of 256 bits is used. To specify a different key size, set EncryptionKeySize.

HashAlgorithm Property (ECC Component)

The hash algorithm used for hash computation.

Syntax

property HashAlgorithm: TipcECCHashAlgorithms read get_HashAlgorithm write set_HashAlgorithm;

TipcECCHashAlgorithms = (
  ehaSHA1,
  ehaSHA224,
  ehaSHA256,
  ehaSHA384,
  ehaSHA512,
  ehaMD2,
  ehaMD4,
  ehaMD5,
  ehaMD5SHA1,
  ehaRIPEMD160
);

Default Value

ehaSHA256

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.

HashEdDSA Property (ECC Component)

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

Syntax

property HashEdDSA: Boolean read get_HashEdDSA write set_HashEdDSA;

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 component 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 component 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.

HashSignature Property (ECC Component)

The hash signature.

Syntax

property HashSignature: String read get_HashSignature write set_HashSignature;
property HashSignatureB: TBytes read get_HashSignatureB write set_HashSignatureB;

Default Value

''

Remarks

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

HashValue Property (ECC Component)

The hash value of the data.

Syntax

property HashValue: String read get_HashValue write set_HashValue;
property HashValueB: TBytes read get_HashValueB write set_HashValueB;

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 component, 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 component 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 component 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.

HMACAlgorithm Property (ECC Component)

The HMAC algorithm to use during encryption.

Syntax

property HMACAlgorithm: TipcECCHMACAlgorithms read get_HMACAlgorithm write set_HMACAlgorithm;

TipcECCHMACAlgorithms = (
  iesHMACSHA1,
  iesHMACSHA224,
  iesHMACSHA256,
  iesHMACSHA384,
  iesHMACSHA512,
  iesHMACRIPEMD160
);

Default Value

iesHMACSHA256

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.

InputFile Property (ECC Component)

The file to process.

Syntax

property InputFile: String read get_InputFile write set_InputFile;

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 component 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.

InputMessage Property (ECC Component)

The message to process.

Syntax

property InputMessage: String read get_InputMessage write set_InputMessage;
property InputMessageB: TBytes read get_InputMessageB write set_InputMessageB;

Default Value

''

Remarks

This property specifies the message to be processed.

Input and Output Properties

The component 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.

IV Property (ECC Component)

The initialization vector (IV) used when encrypting.

Syntax

property IV: String read get_IV write set_IV;
property IVB: TBytes read get_IVB write set_IVB;

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 component 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.

KDF Property (ECC Component)

The key derivation function used during encryption and decryption.

Syntax

property KDF: String read get_KDF write set_KDF;

Default Value

'KDF2'

Remarks

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

• "KDF1"
• "KDF2" (default)

The KDFHashAlgorithm specifies the hash algorithm used in conjunction with the specified KDF.

This property is only applicable when calling Encrypt or Decrypt.

KDFHashAlgorithm Property (ECC Component)

The KDF hash algorithm to use when encrypting and decrypting.

Syntax

property KDFHashAlgorithm: TipcECCKDFHashAlgorithms read get_KDFHashAlgorithm write set_KDFHashAlgorithm;

TipcECCKDFHashAlgorithms = (
  iesSHA1,
  iesSHA224,
  iesSHA256,
  iesSHA384,
  iesSHA512
);

Default Value

iesSHA256

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.

Key Property (ECC Component)

The ECC key.

Syntax

property Key: TipcECCKey read get_Key write set_Key;

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.

Please refer to the ECCKey type for a complete list of fields.

OutputFile Property (ECC Component)

The output file when encrypting or decrypting.

Syntax

property OutputFile: String read get_OutputFile write set_OutputFile;

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 component 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.

OutputMessage Property (ECC Component)

The output message when encrypting or decrypting.

Syntax

property OutputMessage: String read get_OutputMessage;
property OutputMessageB: TBytes read get_OutputMessageB;

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 component 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.

Overwrite Property (ECC Component)

Indicates whether or not the component should overwrite files.

Syntax

property Overwrite: Boolean read get_Overwrite write set_Overwrite;

Default Value

false

Remarks

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

RecipientCert Property (ECC Component)

The certificate used for encryption and computing a shared secret.

Syntax

property RecipientCert: TipcCertificate read get_RecipientCert write set_RecipientCert;

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.

Please refer to the Certificate type for a complete list of fields.

RecipientKey Property (ECC Component)

The public key used to compute the shared secret.

Syntax

property RecipientKey: TipcECCKey read get_RecipientKey write set_RecipientKey;

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.

Please refer to the ECCKey type for a complete list of fields.

SharedSecret Property (ECC Component)

The computed shared secret.

Syntax

property SharedSecret: String read get_SharedSecret;
property SharedSecretB: TBytes read get_SharedSecretB;

Default Value

''

Remarks

This property holds the shared secret computed by ComputeSecret.

This property is read-only.

SignerCert Property (ECC Component)

The certificate used for signature verification.

Syntax

property SignerCert: TipcCertificate read get_SignerCert write set_SignerCert;

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.

Please refer to the Certificate type for a complete list of fields.

SignerKey Property (ECC Component)

The public key used to verify the signature.

Syntax

property SignerKey: TipcECCKey read get_SignerKey write set_SignerKey;

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.

Please refer to the ECCKey type for a complete list of fields.

UseHex Property (ECC Component)

Whether binary values are hex encoded.

Syntax

property UseHex: Boolean read get_UseHex write set_UseHex;

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 component 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 component 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 component 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 component will expect InputMessage or InputFile to hold hex encoded data. The component will then hex decode the data and perform decryption as normal.

ComputeSecret Method (ECC Component)

Computes a shared secret.

Syntax

procedure ComputeSecret();

Remarks

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

When this method is called, the component 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.

Config Method (ECC Component)

Sets or retrieves a configuration setting.

Syntax

function Config(ConfigurationString: String): String;

Remarks

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

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, 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.

CreateKey Method (ECC Component)

Creates a new key.

Syntax

procedure CreateKey(KeyAlgorithm: String);

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 properties 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"

Decrypt Method (ECC Component)

Decrypted the specified data.

Syntax

procedure 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 component 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 component 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);

Encrypt Method (ECC Component)

Encrypts the specified data.

Syntax

procedure 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 component 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 component 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);

Reset Method (ECC Component)

Resets the component.

Syntax

procedure Reset();

Remarks

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

SetInputStream Method (ECC Component)

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

Syntax

procedure SetInputStream(InputStream: TStream);

Remarks

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

Input and Output Properties

The component 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.

SetOutputStream Method (ECC Component)

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

Syntax

procedure SetOutputStream(OutputStream: TStream);

Remarks

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

Input and Output Properties

The component 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.

Sign Method (ECC Component)

Creates a hash signature using ECDSA or EdDSA.

Syntax

procedure Sign();

Remarks

Sign will create a hash signature using ECDSA or EdDSA. The component 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 component 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();

VerifySignature Method (ECC Component)

Verifies the signature for the specified data.

Syntax

function VerifySignature(): Boolean;

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 component 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 Event (ECC Component)

Fired when information is available about errors during data delivery.

Syntax

type TErrorEvent = procedure (
  Sender: TObject;
  ErrorCode: Integer;
  const Description: String
) of Object;

property OnError: TErrorEvent read FOnError write FOnError;

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component raises an exception.

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 Component)

Fired as progress is made.

Syntax

type TProgressEvent = procedure (
  Sender: TObject;
  BytesProcessed: Int64;
  PercentProcessed: Integer
) of Object;

property OnProgress: TProgressEvent read FOnProgress write FOnProgress;

Remarks

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

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.

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

>

constructor Create();

>

constructor Create(valEncoded: TBytes);

>

constructor Create(valStoreType: TipcCertStoreTypes; valStore: String; valStorePassword: String; valSubject: String);

>

constructor Create(valStoreType: TipcCertStoreTypes; valStore: TBytes; valStorePassword: String; valSubject: String);

ECCKey Type

Contains the parameters for the ECC algorithm.

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

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constructor Create();

Config Settings (ECC Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

ECC Config Settings

Base Config Settings

Trappable Errors (ECC Component)

ECC Errors