private PinnedBuffer EncryptInCbcMode(PinnedBuffer plaintext, PinnedBuffer privateKey, PinnedBuffer initializationVector)
{
initializationVector.RejectIf().IsNull(nameof(initializationVector)).OrIf(argument => argument.Count() != BlockSizeInBytes, nameof(privateKey), "The length of the specified initialization vector is invalid for the algorithm.");
using (var encryptionProvider = InitializeProvider())
{
encryptionProvider.BlockSize = BlockSizeInBits;
encryptionProvider.KeySize = KeySizeInBits;
encryptionProvider.Mode = Mode;
encryptionProvider.Padding = PaddingMode;
encryptionProvider.Key = privateKey;
encryptionProvider.IV = initializationVector;
using (var encryptor = encryptionProvider.CreateEncryptor(privateKey, initializationVector))
{
using (var memoryStream = new MemoryStream())
{
using (var cryptographicStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptographicStream.Write(plaintext, 0, plaintext.Length);
cryptographicStream.FlushFinalBlock();
return(new PinnedBuffer(initializationVector.Concat(memoryStream.ToArray()).ToArray(), false));
}
}
}
}
}