public DecryptionBuffer(string password, string salt, SymmetricCryptoAlgorithm cryptoAlgorithm = SymmetricCryptoAlgorithm.AES_256_CBC, PaddingMode paddingMode = PaddingMode.PKCS7)
{
byte[] saltValueBytes = CryptoCommon.GetBytes(salt);
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(password, saltValueBytes, 7);
Initialize(key, cryptoAlgorithm, paddingMode);
}
private void InitializeWithAutoSalt()
{
SymmetricAlgorithm symmetricAlg = CryptoCommon.GetSymmetricAlgorithm(_autoSaltCryptoAlgorithm);
symmetricAlg.Padding = CryptoCommon.GetPaddingMode(_autoSaltPaddingMode);
byte[] salt = _restBuffer.GetBytes(_autoSaltLength);
if (_autoSaltLength == 4) // If salt length is 4, then add it twice because Rfc2898DeriveBytes supports only 8 byte salts
{
ByteBuffer newSalt = new ByteBuffer();
newSalt.AddBytes(salt);
newSalt.AddBytes(salt);
salt = newSalt.GetAllBytes();
}
Rfc2898DeriveBytes key;
if (_keyBytes != null)
{
key = new Rfc2898DeriveBytes(_keyBytes, salt, 7);
}
else
{
key = new Rfc2898DeriveBytes(_keyStr, salt, 7);
}
_keyStr = null;
_keyBytes = null;
byte[] ivBytes = key.GetBytes(symmetricAlg.BlockSize / 8);
byte[] keyBytes = key.GetBytes(symmetricAlg.KeySize / 8);
_keySize = symmetricAlg.KeySize;
_ic = symmetricAlg.CreateDecryptor(keyBytes, ivBytes);
_autosizeSaltInitialized = true;
}
private void Initialize(Rfc2898DeriveBytes key, SymmetricCryptoAlgorithm cryptoAlgorithm, PaddingMode paddingMode)
{
_gotAllData = false;
SymmetricAlgorithm symmetricAlg = CryptoCommon.GetSymmetricAlgorithm(cryptoAlgorithm);
symmetricAlg.Padding = CryptoCommon.GetPaddingMode(paddingMode);
byte[] ivBytes;
byte[] keyBytes;
lock (key) // Make key threadsafe from itself if you reuse the same one ove and over
{
key.Reset();
ivBytes = key.GetBytes(symmetricAlg.BlockSize / 8);
keyBytes = key.GetBytes(symmetricAlg.KeySize / 8);
}
_keySize = symmetricAlg.KeySize;
_ic = symmetricAlg.CreateDecryptor(keyBytes, ivBytes);
}
public static string DecryptBase64String(string password, AutoSaltSizes saltSize, string b64StrData, SymmetricCryptoAlgorithm algorithm = SymmetricCryptoAlgorithm.AES_256_CBC)
{
byte[] data = Convert.FromBase64String(b64StrData);
byte[] encryptedData = DecryptData(password, saltSize, data, algorithm);
return(CryptoCommon.GetString(encryptedData));
}
public static string EncryptBase64String(string password, string salt, string strData, SymmetricCryptoAlgorithm algorithm = SymmetricCryptoAlgorithm.AES_256_CBC)
{
byte[] data = CryptoCommon.GetBytes(strData);
byte[] encryptedData = EncryptData(password, salt, data, algorithm);
return(Convert.ToBase64String(encryptedData));
}
public static string EncryptString(string password, AutoSaltSizes saltSize, string strData, SymmetricCryptoAlgorithm algorithm = SymmetricCryptoAlgorithm.AES_256_CBC)
{
byte[] data = CryptoCommon.GetBytes(strData);
byte[] encryptedData = EncryptData(password, saltSize, data, algorithm);
return(CryptoCommon.GetString(encryptedData));
}