private static byte[] CryptoTransformCore(byte[] value, byte[] key, byte[] initializationVector, AdvancedEncryptionStandardCommand command)
{
ValidateInput(value, key, initializationVector);
byte[] output = null;
using (Aes rijndael = Aes.Create())
{
rijndael.BlockSize = BlockSize;
rijndael.Key = key;
rijndael.IV = initializationVector;
rijndael.Padding = PaddingMode.PKCS7;
rijndael.Mode = CipherMode.CBC;
MemoryStream tempStream = null;
CryptoStream cryptoStream = null;
try
{
switch (command)
{
case AdvancedEncryptionStandardCommand.Decrypt:
tempStream = new MemoryStream(value);
cryptoStream = new CryptoStream(tempStream, rijndael.CreateDecryptor(), CryptoStreamMode.Read);
output = new byte[value.Length];
cryptoStream.Read(output, 0, output.Length);
tempStream = null;
output = ByteUtility.RemoveTrailingZeros(output);
break;
case AdvancedEncryptionStandardCommand.Encrypt:
tempStream = new MemoryStream();
cryptoStream = new CryptoStream(tempStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write);
cryptoStream.Write(value, 0, value.Length);
cryptoStream.FlushFinalBlock();
output = tempStream.ToArray();
tempStream = null;
break;
}
}
finally
{
if (cryptoStream != null)
{
cryptoStream.Dispose();
}
if (tempStream != null)
{
tempStream.Dispose();
}
}
}
return(output);
}