Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Cryptography / HashAlgorithm.cs / 1305376 / HashAlgorithm.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // HashAlgorithm.cs // namespace System.Security.Cryptography { using System.IO; using System.Diagnostics.Contracts; [System.Runtime.InteropServices.ComVisible(true)] public abstract class HashAlgorithm : IDisposable, ICryptoTransform { protected int HashSizeValue; protected internal byte[] HashValue; protected int State = 0; private bool m_bDisposed = false; protected HashAlgorithm() {} // // public properties // public virtual int HashSize { get { return HashSizeValue; } } public virtual byte[] Hash { get { if (m_bDisposed) throw new ObjectDisposedException(null); if (State != 0) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_HashNotYetFinalized")); return (byte[]) HashValue.Clone(); } } // // public methods // [System.Security.SecuritySafeCritical] // auto-generated static public HashAlgorithm Create() { return Create("System.Security.Cryptography.HashAlgorithm"); } [System.Security.SecuritySafeCritical] // auto-generated static public HashAlgorithm Create(String hashName) { return (HashAlgorithm) CryptoConfig.CreateFromName(hashName); } public byte[] ComputeHash(Stream inputStream) { if (m_bDisposed) throw new ObjectDisposedException(null); // Default the buffer size to 4K. byte[] buffer = new byte[4096]; int bytesRead; do { bytesRead = inputStream.Read(buffer, 0, 4096); if (bytesRead > 0) { HashCore(buffer, 0, bytesRead); } } while (bytesRead > 0); HashValue = HashFinal(); byte[] Tmp = (byte[]) HashValue.Clone(); Initialize(); return(Tmp); } public byte[] ComputeHash(byte[] buffer) { if (m_bDisposed) throw new ObjectDisposedException(null); // Do some validation if (buffer == null) throw new ArgumentNullException("buffer"); HashCore(buffer, 0, buffer.Length); HashValue = HashFinal(); byte[] Tmp = (byte[]) HashValue.Clone(); Initialize(); return(Tmp); } public byte[] ComputeHash(byte[] buffer, int offset, int count) { // Do some validation if (buffer == null) throw new ArgumentNullException("buffer"); if (offset < 0) throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (count < 0 || (count > buffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((buffer.Length - count) < offset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); Contract.EndContractBlock(); if (m_bDisposed) throw new ObjectDisposedException(null); HashCore(buffer, offset, count); HashValue = HashFinal(); byte[] Tmp = (byte[]) HashValue.Clone(); Initialize(); return(Tmp); } // ICryptoTransform methods // we assume any HashAlgorithm can take input a byte at a time public virtual int InputBlockSize { get { return(1); } } public virtual int OutputBlockSize { get { return(1); } } public virtual bool CanTransformMultipleBlocks { get { return(true); } } public virtual bool CanReuseTransform { get { return(true); } } // We implement TransformBlock and TransformFinalBlock here [System.Security.SecuritySafeCritical] // auto-generated public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset) { // Do some validation, we let BlockCopy do the destination array validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); Contract.EndContractBlock(); if (m_bDisposed) throw new ObjectDisposedException(null); // Change the State value State = 1; HashCore(inputBuffer, inputOffset, inputCount); if ((outputBuffer != null) && ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))) Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount); return inputCount; } [System.Security.SecuritySafeCritical] // auto-generated public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount) { // Do some validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); Contract.EndContractBlock(); if (m_bDisposed) throw new ObjectDisposedException(null); HashCore(inputBuffer, inputOffset, inputCount); HashValue = HashFinal(); byte[] outputBytes = new byte[inputCount]; if (inputCount != 0) Buffer.InternalBlockCopy(inputBuffer, inputOffset, outputBytes, 0, inputCount); // reset the State value State = 0; return outputBytes; } // IDisposable methods // To keep mscorlib compatibility with Orcas, CoreCLR's HashAlgorithm has an explicit IDisposable // implementation. Post-Orcas the desktop has an implicit IDispoable implementation. #if FEATURE_CORECLR void IDisposable.Dispose() #if false { } #endif // false #else [System.Security.SecuritySafeCritical] // auto-generated public void Dispose() #endif // FEATURE_CORECLR { Dispose(true); GC.SuppressFinalize(this); } public void Clear() { (this as IDisposable).Dispose(); } protected virtual void Dispose(bool disposing) { if (disposing) { if (HashValue != null) Array.Clear(HashValue, 0, HashValue.Length); HashValue = null; m_bDisposed = true; } } // // abstract public methods // public abstract void Initialize(); protected abstract void HashCore(byte[] array, int ibStart, int cbSize); protected abstract byte[] HashFinal(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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