IPWorks Encrypt 2020 Android Edition

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Decrypt Method

Decrypted the specified data.

Syntax

public void 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:

  • secp256r1
  • secp384r2
  • secp521r1

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:

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:

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

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);

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IPWorks Encrypt 2020 Android Edition - Version 20.0 [Build 8161]