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(Blowfish): moved to GameRes.Cryptography namespace.
(BlowfishDecryptor): ICryptoTransform interface implementation. (BlowfishStream): removed as unused.
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morkt
parent
837c203e4b
commit
db0d39f863
@ -25,10 +25,11 @@
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|***************************************************************************/
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using System;
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using System.Text;
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using System.IO;
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using System.Security.Cryptography;
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using GameRes.Utility;
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namespace Simias.Encryption
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namespace GameRes.Cryptography
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{
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/// <summary>
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/// Class that provides blowfish encryption.
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@ -285,11 +286,6 @@ namespace Simias.Encryption
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}
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="x"></param>
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/// <returns></returns>
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private uint F(uint x)
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{
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ushort a;
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@ -443,235 +439,61 @@ namespace Simias.Encryption
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}
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}
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public class BlowfishStream : Stream
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/// <summary>
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/// ICryptoTransform implementation for use with CryptoStream.
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/// </summary>
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public sealed class BlowfishDecryptor : ICryptoTransform
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{
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class CBState : IAsyncResult
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{
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internal AsyncCallback callback;
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internal object state;
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internal byte[] buffer;
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internal IAsyncResult result;
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internal CBState(AsyncCallback callback, object state, byte[] buffer)
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{
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this.callback = callback;
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this.state = state;
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this.buffer = buffer;
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}
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#region IAsyncResult Members
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Blowfish m_bf;
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public object AsyncState
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public const int BlockSize = 8;
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public bool CanTransformMultipleBlocks { get { return true; } }
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public bool CanReuseTransform { get { return true; } }
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public int InputBlockSize { get { return BlockSize; } }
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public int OutputBlockSize { get { return BlockSize; } }
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public BlowfishDecryptor (Blowfish bf)
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{
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get
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{
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return state;
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}
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m_bf = bf;
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}
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public bool CompletedSynchronously
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public int TransformBlock (byte[] inBuffer, int offset, int count, byte[] outBuffer, int outOffset)
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{
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get
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for (int i = 0; i < count; i += BlockSize)
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{
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return result.CompletedSynchronously;
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uint xl = LittleEndian.ToUInt32 (inBuffer, offset+i);
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uint xr = LittleEndian.ToUInt32 (inBuffer, offset+i+4);
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m_bf.Decipher (ref xl, ref xr);
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LittleEndian.Pack (xl, outBuffer, outOffset+i);
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LittleEndian.Pack (xr, outBuffer, outOffset+i+4);
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}
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return count;
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}
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public System.Threading.WaitHandle AsyncWaitHandle
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static readonly byte[] EmptyArray = new byte[0];
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public byte[] TransformFinalBlock (byte[] inBuffer, int offset, int count)
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{
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get
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{
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return result.AsyncWaitHandle;
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}
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if (0 == count)
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return EmptyArray;
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if (0 != count % BlockSize)
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throw new InvalidDataException ("Non-padded block in Blowfish encrypted stream");
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var output = new byte[count];
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TransformBlock (inBuffer, offset, count, output, 0);
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return output;
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}
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public bool IsCompleted
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#region IDisposable implementation
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bool _disposed = false;
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public void Dispose ()
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{
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get
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if (!_disposed)
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{
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return result.IsCompleted;
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_disposed = true;
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}
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GC.SuppressFinalize (this);
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}
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#endregion
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}
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public enum Target
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{
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Encrypted,
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Normal
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};
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Stream stream;
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Blowfish bf;
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Target target;
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BlowfishStream(Stream stream, Blowfish bf, Target target)
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{
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this.stream = stream;
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this.bf = bf;
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this.target = target;
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}
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/// <summary>
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/// Returns true if the stream support reads.
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/// </summary>
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public override bool CanRead
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{
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get {return stream.CanRead;}
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}
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/// <summary>
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/// Returns true is the stream supports seeks.
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/// </summary>
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public override bool CanSeek
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{
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get {return stream.CanSeek;}
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}
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/// <summary>
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/// Returns true if the stream supports writes.
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/// </summary>
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public override bool CanWrite
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{
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get {return stream.CanWrite;}
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}
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/// <summary>
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/// Returns the length of the stream.
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/// </summary>
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public override long Length
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{
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get {return stream.Length;}
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}
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/// <summary>
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/// Gets or Sets the posistion of the stream.
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/// </summary>
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public override long Position
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{
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get {return stream.Position;}
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set {stream.Position = value;}
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}
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/// <summary>
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/// Flushes the stream.
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/// </summary>
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public override void Flush()
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{
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stream.Flush();
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}
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/// <summary>
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/// Read data from the stream and encrypt it.
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/// </summary>
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/// <param name="buffer">The buffer to read into.</param>
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/// <param name="offset">The offset in the buffer to begin storing data.</param>
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/// <param name="count">The number of bytes to read.</param>
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/// <returns></returns>
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public override int Read(byte[] buffer, int offset, int count)
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{
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int bytesRead = stream.Read(buffer, offset, count);
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if (target == Target.Normal)
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bf.Encipher(buffer, bytesRead);
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else
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bf.Decipher(buffer, bytesRead);
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return bytesRead;
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}
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/// <summary>
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/// Write data to the stream after decrypting it.
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/// </summary>
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/// <param name="buffer">The buffer containing the data to write.</param>
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/// <param name="offset">The offset in the buffer where the data begins.</param>
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/// <param name="count">The number of bytes to write.</param>
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public override void Write(byte[] buffer, int offset, int count)
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{
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if (target == Target.Normal)
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bf.Decipher(buffer, count);
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else
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bf.Encipher(buffer, count);
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stream.Write(buffer, offset, count);
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="buffer"></param>
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/// <param name="offset"></param>
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/// <param name="count"></param>
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/// <param name="callback"></param>
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/// <param name="state"></param>
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/// <returns></returns>
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public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
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{
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CBState cbs = new CBState(callback, state, buffer);
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cbs.result = base.BeginRead (buffer, offset, count, new AsyncCallback(ReadComplete), cbs);
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return cbs;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="asyncResult"></param>
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/// <returns></returns>
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public override int EndRead(IAsyncResult asyncResult)
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{
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CBState cbs = (CBState)asyncResult.AsyncState;
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int bytesRead = base.EndRead (cbs.result);
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if (target == Target.Normal)
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bf.Encipher(cbs.buffer, bytesRead);
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else
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bf.Decipher(cbs.buffer, bytesRead);
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return bytesRead;
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}
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/// <summary>
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/// The Read has completed.
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/// </summary>
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/// <param name="result">The result of the async write.</param>
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private void ReadComplete(IAsyncResult result)
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{
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CBState cbs = (CBState)result.AsyncState;
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cbs.callback(cbs);
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="buffer"></param>
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/// <param name="offset"></param>
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/// <param name="count"></param>
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/// <param name="callback"></param>
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/// <param name="state"></param>
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/// <returns></returns>
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public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
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{
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if (target == Target.Normal)
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bf.Decipher(buffer, count);
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else
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bf.Encipher(buffer, count);
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return base.BeginWrite (buffer, offset, count, callback, state);
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}
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/// <summary>
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/// Move the current stream posistion to the specified location.
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/// </summary>
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/// <param name="offset">The offset from the origin to seek.</param>
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/// <param name="origin">The origin to seek from.</param>
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/// <returns>The new position.</returns>
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public override long Seek(long offset, SeekOrigin origin)
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{
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return stream.Seek(offset, origin);
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}
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/// <summary>
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/// Set the stream length.
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/// </summary>
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/// <param name="value">The length to set.</param>
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public override void SetLength(long value)
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{
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stream.SetLength(value);
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}
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}
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}
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@ -30,7 +30,6 @@ using System.Text;
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using System.ComponentModel;
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using System.ComponentModel.Composition;
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using System.Collections.Generic;
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using Simias.Encryption;
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using System.Runtime.InteropServices;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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