private static byte[] Encrypt(byte[] input, byte[] key, int keySize, System.Security.Cryptography.CipherMode mode, byte[] iv = null)
{
using (var aesEncryption = Aes.Create())
{
if (iv == null)
{
aesEncryption.GenerateIV();
}
else
{
aesEncryption.IV = iv;
}
aesEncryption.KeySize = keySize;
aesEncryption.BlockSize = Crypto.DefaultBlocklength * 8;
aesEncryption.Mode = mode;
aesEncryption.Padding = PaddingMode.PKCS7;
aesEncryption.Key = key;
ICryptoTransform crypto = aesEncryption.CreateEncryptor();
// The result of the encryption and decryption
byte[] cipherText = crypto.TransformFinalBlock(input, 0, input.Length);
var result = new byte[cipherText.Length + aesEncryption.IV.Length];
Buffer.BlockCopy(aesEncryption.IV, 0, result, 0, aesEncryption.IV.Length);
Buffer.BlockCopy(cipherText, 0, result, aesEncryption.IV.Length, cipherText.Length);
return(result);
}
}
static byte[] Decrypt(byte[] input, byte[] key, int keySize, System.Security.Cryptography.CipherMode mode)
{
byte[] iv = input.Take(Crypto.DefaultBlocklength).ToArray();
using (var aesEncryption = Aes.Create())
{
aesEncryption.KeySize = keySize;
aesEncryption.BlockSize = Crypto.DefaultBlocklength * 8;
aesEncryption.Mode = mode;
aesEncryption.Padding = PaddingMode.PKCS7;
aesEncryption.IV = iv;
aesEncryption.Key = key;
ICryptoTransform decrypt = aesEncryption.CreateDecryptor();
var encryptedBuffer = input.Skip(Crypto.DefaultBlocklength).ToArray();
return(decrypt.TransformFinalBlock(encryptedBuffer, 0, encryptedBuffer.Length));
}
}
