/// <summary>
/// Decrypts a byte array
/// </summary>
/// <param name="cipherText">Ciphertext byte array</param>
/// <param name="mode">Cipher mode</param>
/// <returns>Plaintext or null if moode is not CipherMode.ECB.</returns>
public byte[] Decrypt(byte[] cipherText, System.Security.Cryptography.CipherMode mode)
{
switch (mode)
{
case System.Security.Cryptography.CipherMode.ECB:
return(Decrypt_ECB(cipherText));
default:
return(null);
}
}
static CipherMode FromSysCipherMode(System.Security.Cryptography.CipherMode mode)
{
switch (mode)
{
case System.Security.Cryptography.CipherMode.CBC:
return(CipherMode.CBC);
case System.Security.Cryptography.CipherMode.ECB:
return(CipherMode.ECB);
case System.Security.Cryptography.CipherMode.OFB:
return(CipherMode.OFB);
case System.Security.Cryptography.CipherMode.CFB:
return(CipherMode.CFB);
case System.Security.Cryptography.CipherMode.CTS:
return(CipherMode.CTS);
default:
throw new Exception();
}
}
/// <summary>
/// Sets the CipherMode.
/// </summary>
/// <param name="cipherMode">new CipherMode</param>
public void updateCipherMode(System.Security.Cryptography.CipherMode cipherMode = System.Security.Cryptography.CipherMode.CBC)
{
this.cipherMode = cipherMode;
}
private static ISymmetricCryptoAlgorithm GetSymmetricAlgorithm(this SymmetricAlgorithmName name,
SymmetricAlgorithmKey keySize, System.Security.Cryptography.CipherMode mode)
{
switch (name)
{
case SymmetricAlgorithmName.TripleDES:
return(new TripleDES(keySize: (int)keySize, mode: mode));
break;
case SymmetricAlgorithmName.AES:
default:
return(new AES(keySize: (int)keySize, mode: mode));
break;
}
}
