//Decrypt the envelope and return the output array.
public byte[] DecryptEnvelope()
{
//Create the RSAWrapper from a string representation of its name.
rsaAlgorithm = new RSAWrapper(rsaName);
//Initialize the RSA algorithm key.
rsaAlgorithm.RSAalg.FromXmlString(rsaKey);
//Create the CipherMode from a string representation of its name.
cipherMode = HelperExtensions.StringToCipherMode(cipherName);
symmetricAlgorithm = HelperExtensions.StringToSymAlg(symmetricAlgorithmName, cipherMode, cipherName);
symmetricAlgorithm.algorithm.IV = initializationVector;
symmetricAlgorithm.algorithm.Key = rsaAlgorithm.RSADecrypt(DigitalEnvelopeEncrypted.EncryptedSymmetricKey, true);
return(symmetricAlgorithm.Decrypt(DigitalEnvelopeEncrypted.EncryptedMessage));
}
//Validate the digital signature and return true if was authenticated successfully.
public bool AuthenticateSignature()
{
rsaAlgorithm = new RSAWrapper(rsaName, hashAlgorithmName);
rsaAlgorithm.RSAalg.FromXmlString(rsaKey);
return(rsaAlgorithm.VerifySignedHash(input, signature));
}
//Constructor for the purpose of signing files. The input is given as a byte array.
public DigitalSignature(RSAWrapper rsaAlgorithm, byte[] input)
{
this.rsaAlgorithm = rsaAlgorithm;
this.input = input;
}
//Constructor for the purpose of signing files. The input is given as a file path.
public DigitalSignature(RSAWrapper rsaAlgorithm, string inputFilePath)
{
this.rsaAlgorithm = rsaAlgorithm;
LoadInputFile(inputFilePath);
}
//Create a DigitalEnvelope instance which will be used to create an envelope.
public DigitalEnvelope(SymmetricAlgorithmWrapper SYMAlgorithm, RSAWrapper rsaAlgorithm, string inputFilePath)
{
this.symmetricAlgorithm = SYMAlgorithm;
this.rsaAlgorithm = rsaAlgorithm;
LoadInputFile(inputFilePath);
}
