public static HexString EncryptByPassPhrase(string passphrase, string cleartext, int add_authenticator, string authenticator, SQLServerCryptoVersion sqlServerCryptoVersion)
{
var sqlServerCryptoAlgorithm = new SQLServerCryptoAlgorithm(sqlServerCryptoVersion);
sqlServerCryptoAlgorithm.SetKeyFromPassPhrase(passphrase);
byte[] header = new SQLServerCryptoHeader()
{
Version = sqlServerCryptoVersion,
InitializationVector = sqlServerCryptoAlgorithm.Symmetric.IV
};
var sqlServerCryptoMessage = new SQLServerCryptoMessage()
{
AddAuthenticator = add_authenticator > 0,
Authenticator = authenticator
};
sqlServerCryptoMessage.CreateFromClearText(cleartext);
byte[] message = sqlServerCryptoMessage;
var encryptedMessage = sqlServerCryptoAlgorithm.Symmetric
.CreateEncryptor()
.TransformFinalBlock(message, 0, message.Length);
return(new HexString(header.Concat(encryptedMessage).ToArray()));
}
public static string DecryptByPassPhrase(string passphrase, HexString ciphertext, int add_authenticator, string authenticator, bool verify)
{
byte[] ciphertextBytes = ciphertext.ToByteArray();
var version = (SQLServerCryptoVersion)ciphertextBytes[0];
var sqlServerCryptoAlgorithm = new SQLServerCryptoAlgorithm(version);
sqlServerCryptoAlgorithm.SetKeyFromPassPhrase(passphrase);
var versionAndReservedSize = 4;
var ivSize = sqlServerCryptoAlgorithm.KeySize / 2;
var header = new SQLServerCryptoHeader
{
Version = version,
InitializationVector = ciphertextBytes.Skip(versionAndReservedSize).Take(ivSize).ToArray()
};
sqlServerCryptoAlgorithm.Symmetric.IV = header.InitializationVector;
var encryptedMessage = ciphertextBytes.Skip(versionAndReservedSize + ivSize).ToArray();
var decryptedMessage = sqlServerCryptoAlgorithm.Symmetric
.CreateDecryptor()
.TransformFinalBlock(encryptedMessage, 0, encryptedMessage.Length);
// Message
var sqlServerCryptoMessage = new SQLServerCryptoMessage()
{
AddAuthenticator = add_authenticator > 0,
Authenticator = authenticator
};
sqlServerCryptoMessage.CreateFromDecryptedMessage(decryptedMessage, verify);
return(ByteArray2String(sqlServerCryptoMessage.MessageBytes));
}
