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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto.IO
{
public class MacStream
: Stream
{
protected readonly Stream stream;
protected readonly IMac inMac;
protected readonly IMac outMac;
public MacStream(
Stream stream,
IMac readMac,
IMac writeMac)
{
this.stream = stream;
this.inMac = readMac;
this.outMac = writeMac;
}
public virtual IMac ReadMac()
{
return inMac;
}
public virtual IMac WriteMac()
{
return outMac;
}
public override int Read(
byte[] buffer,
int offset,
int count)
{
int n = stream.Read(buffer, offset, count);
if (inMac != null)
{
if (n > 0)
{
inMac.BlockUpdate(buffer, offset, n);
}
}
return n;
}
public override int ReadByte()
{
int b = stream.ReadByte();
if (inMac != null)
{
if (b >= 0)
{
inMac.Update((byte)b);
}
}
return b;
}
public override void Write(
byte[] buffer,
int offset,
int count)
{
if (outMac != null)
{
if (count > 0)
{
outMac.BlockUpdate(buffer, offset, count);
}
}
stream.Write(buffer, offset, count);
}
public override void WriteByte(byte b)
{
if (outMac != null)
{
outMac.Update(b);
}
stream.WriteByte(b);
}
public override bool CanRead
{
get { return stream.CanRead; }
}
public override bool CanWrite
{
get { return stream.CanWrite; }
}
public override bool CanSeek
{
get { return stream.CanSeek; }
}
public override long Length
{
get { return stream.Length; }
}
public override long Position
{
get { return stream.Position; }
set { stream.Position = value; }
}
#if PORTABLE
protected override void Disposing(bool disposing)
{
if (disposing)
{
Platform.Dispose(stream);
}
base.Dispose(disposing);
}
#else
public override void Close()
{
Platform.Dispose(stream);
}
#endif
public override void Flush()
{
stream.Flush();
}
public override long Seek(
long offset,
SeekOrigin origin)
{
return stream.Seek(offset,origin);
}
public override void SetLength(
long length)
{
stream.SetLength(length);
}
}
}
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