public SQLServerCryptoAlgorithm(SQLServerCryptoVersion sqlCryptoVersion)
{
Version = sqlCryptoVersion;
switch (Version)
{
case SQLServerCryptoVersion.V1:
Hash = SHA1.Create();
Symmetric = TripleDES.Create();
KeySize = 16;
break;
case SQLServerCryptoVersion.V2:
Hash = SHA256.Create();
Symmetric = Aes.Create();
KeySize = 32;
break;
default:
throw new Exception("Unsupported SQLServerCryptoVersion");
}
Symmetric.Padding = PaddingMode.PKCS7;
Symmetric.Mode = CipherMode.CBC;
}
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 HexString EncryptByPassPhrase(string passphrase, string cleartext, SQLServerCryptoVersion sqlServerCryptoVersion) => EncryptByPassPhrase(passphrase, cleartext, 0, string.Empty, sqlServerCryptoVersion);
public SQLServerCryptoHeader(SQLServerCryptoVersion sqlServerCryptoVersion = SQLServerCryptoVersion.V1) => Version = sqlServerCryptoVersion;
