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// ICryptoTransform implementation on top of CommonCrypto and SymmetricTransform
//
// Authors:
// Sebastien Pouliot <sebastien@xamarin.com>
//
// Copyright 2012 Xamarin Inc.
using System;
using System.Security.Cryptography;
using Mono.Security.Cryptography;
namespace Crimson.CommonCrypto {
class CryptorTransform : SymmetricTransform {
IntPtr handle;
IntPtr handle_e;
bool encryption;
public CryptorTransform (IntPtr cryptor, IntPtr special, SymmetricAlgorithm algo, bool encryption, byte[] iv)
: base (algo, encryption, iv)
{
handle = cryptor;
// for CFB we need to encrypt data while decrypting
handle_e = special;
this.encryption = encryption;
}
~CryptorTransform ()
{
Dispose (false);
}
// PRO: doing this ensure all cipher modes and padding modes supported by .NET will be available with CommonCrypto (drop-in replacements)
// CON: doing this will only process one block at the time, so it's not ideal for performance, but still a lot better than managed
protected override void ECB (byte[] input, byte[] output)
{
IntPtr len = IntPtr.Zero;
CCCryptorStatus s = Cryptor.CCCryptorUpdate ((encrypt == encryption) ? handle : handle_e,
input, (IntPtr) input.Length, output, (IntPtr) output.Length, ref len);
if (((int) len != output.Length) || (s != CCCryptorStatus.Success))
throw new CryptographicUnexpectedOperationException (s.ToString ());
}
protected override void Dispose (bool disposing)
{
if (handle != IntPtr.Zero) {
Cryptor.CCCryptorRelease (handle);
handle = IntPtr.Zero;
}
if (handle_e != IntPtr.Zero) {
Cryptor.CCCryptorRelease (handle_e);
handle_e = IntPtr.Zero;
}
base.Dispose (disposing);
GC.SuppressFinalize (this);
}
}
}
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