public Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV)
{
return(StandardAesEngine.CreateStream(sPlainText, true, pbKey, pbIV));
}
public Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV)
{
return(StandardAesEngine.CreateStream(sEncrypted, false, pbKey, pbIV));
}
private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
StandardAesEngine.ValidateArguments(s, bEncrypt, pbKey, pbIV);
byte[] pbLocalIV = new byte[16];
Array.Copy(pbIV, pbLocalIV, 16);
byte[] pbLocalKey = new byte[32];
Array.Copy(pbKey, pbLocalKey, 32);
#if KeePass2PCL
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.
OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var key = provider.CreateSymmetricKey(pbLocalKey);
if (bEncrypt)
{
var encryptor = WinRTCrypto.CryptographicEngine.CreateEncryptor(
key, pbLocalIV);
return(new CryptoStream(s, encryptor, CryptoStreamMode.Write));
}
else
{
var decryptor = WinRTCrypto.CryptographicEngine.CreateDecryptor(
key, pbLocalIV);
return(new CryptoStream(s, decryptor, CryptoStreamMode.Read));
}
#else
#if !KeePassRT
RijndaelManaged r = new RijndaelManaged();
if (r.BlockSize != 128) // AES block size
{
Debug.Assert(false);
r.BlockSize = 128;
}
r.IV = pbLocalIV;
r.KeySize = 256;
r.Key = pbLocalKey;
r.Mode = m_rCipherMode;
r.Padding = m_rCipherPadding;
ICryptoTransform iTransform = (bEncrypt ? r.CreateEncryptor() : r.CreateDecryptor());
Debug.Assert(iTransform != null);
if (iTransform == null)
{
throw new SecurityException("Unable to create Rijndael transform!");
}
return(new CryptoStream(s, iTransform, bEncrypt ? CryptoStreamMode.Write :
CryptoStreamMode.Read));
#else
AesEngine aes = new AesEngine();
CbcBlockCipher cbc = new CbcBlockCipher(aes);
PaddedBufferedBlockCipher bc = new PaddedBufferedBlockCipher(cbc,
new Pkcs7Padding());
KeyParameter kp = new KeyParameter(pbLocalKey);
ParametersWithIV prmIV = new ParametersWithIV(kp, pbLocalIV);
bc.Init(bEncrypt, prmIV);
IBufferedCipher cpRead = (bEncrypt ? null : bc);
IBufferedCipher cpWrite = (bEncrypt ? bc : null);
return(new CipherStream(s, cpRead, cpWrite));
#endif
#endif
}
