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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel
{
using System.IO;
using System.Security.Cryptography;
using System.IdentityModel.Diagnostics;
sealed class HashStream : Stream
{
HashAlgorithm hash;
long length;
bool disposed;
bool hashNeedsReset;
MemoryStream logStream;
/// <summary>
/// Constructor for HashStream. The HashAlgorithm instance is owned by the caller.
/// </summary>
public HashStream(HashAlgorithm hash)
{
if (hash == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("hash");
Reset(hash);
}
public override bool CanRead
{
get { return false; }
}
public override bool CanWrite
{
get { return true; }
}
public override bool CanSeek
{
get { return false; }
}
public HashAlgorithm Hash
{
get { return this.hash; }
}
public override long Length
{
get { return this.length; }
}
public override long Position
{
get { return this.length; }
set
{
// PreSharp Bug: Property get methods should not throw exceptions.
#pragma warning suppress 56503
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
}
}
public override void Flush()
{
}
public void FlushHash()
{
FlushHash(null);
}
public void FlushHash(MemoryStream preCanonicalBytes)
{
this.hash.TransformFinalBlock(CryptoHelper.EmptyBuffer, 0, 0);
if (DigestTraceRecordHelper.ShouldTraceDigest)
DigestTraceRecordHelper.TraceDigest(this.logStream, this.hash);
}
public byte[] FlushHashAndGetValue()
{
return FlushHashAndGetValue(null);
}
public byte[] FlushHashAndGetValue(MemoryStream preCanonicalBytes)
{
FlushHash(preCanonicalBytes);
return this.hash.Hash;
}
public override int Read(byte[] buffer, int offset, int count)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
}
public void Reset()
{
if (this.hashNeedsReset)
{
this.hash.Initialize();
this.hashNeedsReset = false;
}
this.length = 0;
if (DigestTraceRecordHelper.ShouldTraceDigest)
this.logStream = new MemoryStream();
}
public void Reset(HashAlgorithm hash)
{
this.hash = hash;
this.hashNeedsReset = false;
this.length = 0;
if (DigestTraceRecordHelper.ShouldTraceDigest)
this.logStream = new MemoryStream();
}
public override void Write(byte[] buffer, int offset, int count)
{
this.hash.TransformBlock(buffer, offset, count, buffer, offset);
this.length += count;
this.hashNeedsReset = true;
if (DigestTraceRecordHelper.ShouldTraceDigest)
this.logStream.Write(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
}
public override void SetLength(long length)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
}
#region IDisposable members
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (this.disposed)
{
return;
}
if (disposing)
{
//
// Free all of our managed resources
//
if (this.logStream != null)
{
this.logStream.Dispose();
this.logStream = null;
}
}
// Free native resources, if any.
this.disposed = true;
}
#endregion
}
}
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