public byte[] Decrypt(byte[] data)
{
if (ModeSignature.Equals("CBC") || ModeSignature.Equals("ECB"))
{
using var aes = new AesManaged
{
Mode = AlgorithmUtility.GetCipherMode(ModeSignature)
};
using var decryptor = aes.CreateDecryptor(Key, IV);
using var ms = new MemoryStream(data);
using var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
var decrypted = new byte[data.Length];
var bytesRead = cs.Read(decrypted, 0, decrypted.Length);
return(decrypted.Take(bytesRead).ToArray());
}
else // OFB or CFB
{
byte[] decrypted;
var aes = CreateAesCipher(false);
try
{
decrypted = new byte[aes.GetOutputSize(data.Length)];
var len = aes.ProcessBytes(data, 0, data.Length, decrypted, 0);
aes.DoFinal(decrypted, len);
return(decrypted);
}
catch (CryptoException)
{
}
}
return(null);
}
public byte[] Decrypt(byte[] data)
{
if (!ModeSignature.Equals("OFB"))
{
using var tdes = new TripleDESCryptoServiceProvider
{
Mode = AlgorithmUtility.GetCipherMode(ModeSignature)
};
using var decryptor = tdes.CreateDecryptor(Key, IV);
using var ms = new MemoryStream(data);
using var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
var decrypted = new byte[data.Length];
var bytesRead = cs.Read(decrypted, 0, data.Length);
return decrypted.Take(bytesRead).ToArray();
}
else
{
byte[] decrypted;
var tdes = CreateTripleDesCipher(false);
try
{
decrypted = new byte[tdes.GetOutputSize(data.Length)];
var len = tdes.ProcessBytes(data, 0, data.Length, decrypted, 0);
tdes.DoFinal(decrypted, len);
return decrypted;
}
catch (CryptoException)
{
}
}
return null;
}
public byte[] Encrypt(byte[] data)
{
if (ModeSignature.Equals("CBC") || ModeSignature.Equals("ECB"))
{
using var aes = new AesManaged
{
Mode = AlgorithmUtility.GetCipherMode(ModeSignature)
};
using var encryptor = aes.CreateEncryptor(Key, IV);
using var ms = new MemoryStream();
using var writer = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
writer.Write(data, 0, data.Length);
writer.FlushFinalBlock();
return(ms.ToArray());
}
else // OFB or CFB
{
byte[] encrypted;
var aes = CreateAesCipher(true);
try
{
encrypted = new byte[aes.GetOutputSize(data.Length)];
var len = aes.ProcessBytes(data, 0, data.Length, encrypted, 0);
aes.DoFinal(encrypted, len);
return(encrypted);
}
catch (CryptoException)
{
}
return(null);
}
}
public byte[] Encrypt(byte[] data)
{
if (!ModeSignature.Equals("OFB"))
{
using var tdes = new TripleDESCryptoServiceProvider
{
Mode = AlgorithmUtility.GetCipherMode(ModeSignature)
};
//tdes.Padding = PaddingMode.PKCS7;
using var encryptor = tdes.CreateEncryptor(Key, IV);
using var ms = new MemoryStream();
using var writer = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
writer.Write(data, 0, data.Length);
writer.FlushFinalBlock();
return ms.ToArray();
}
else
{
byte[] encrypted;
var tdes = CreateTripleDesCipher(true);
try
{
encrypted = new byte[tdes.GetOutputSize(data.Length)];
var len = tdes.ProcessBytes(data, 0, data.Length, encrypted, 0);
tdes.DoFinal(encrypted, len);
return encrypted;
}
catch (CryptoException)
{
}
}
return null;
}