HashStream.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / HashStream.cs / 1305376 / HashStream.cs
                        

                        
                            //------------------------------------------------------------ 
// 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 hashNeedsReset;
        MemoryStream logStream; 
 
        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()
        {
            this.hash.TransformFinalBlock(CryptoHelper.EmptyBuffer, 0, 0); 

            if (DigestTraceRecordHelper.ShouldTraceDigest) 
                DigestTraceRecordHelper.TraceDigest(this.logStream, this.hash); 
        }
 
        public byte[] FlushHashAndGetValue()
        {
            FlushHash();
            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());
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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