Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / HashAlgorithm.cs / 1 / HashAlgorithm.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // HashAlgorithm.cs // namespace System.Security.Cryptography { using System.IO; [System.Runtime.InteropServices.ComVisible(true)] public abstract class HashAlgorithm : 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, Environment.GetResourceString("ObjectDisposed_Generic")); if (State != 0) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_HashNotYetFinalized")); return (byte[]) HashValue.Clone(); } } // // public methods // static public HashAlgorithm Create() { return Create("System.Security.Cryptography.HashAlgorithm"); } static public HashAlgorithm Create(String hashName) { return (HashAlgorithm) CryptoConfig.CreateFromName(hashName); } public byte[] ComputeHash(Stream inputStream) { if (m_bDisposed) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // 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, Environment.GetResourceString("ObjectDisposed_Generic")); // 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) { if (m_bDisposed) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // 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")); 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 public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset) { if (m_bDisposed) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // 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")); // 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; } public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount) { if (m_bDisposed) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // 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")); 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 ///void IDisposable.Dispose() { Dispose(true); GC.SuppressFinalize(this); } public void Clear() { ((IDisposable) this).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(); } }
Link Menu
![Network programming in C#, Network Programming in VB.NET, Network Programming in .NET](/images/book.jpg)
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CounterSampleCalculator.cs
- MailMessage.cs
- ColumnResizeAdorner.cs
- CrossSiteScriptingValidation.cs
- XmlNamespaceMappingCollection.cs
- DataBindingHandlerAttribute.cs
- CodeSnippetTypeMember.cs
- LiteralLink.cs
- AssemblyBuilder.cs
- FileDialog.cs
- TimeSpanValidator.cs
- VariableQuery.cs
- Contracts.cs
- TypeElementCollection.cs
- SubclassTypeValidatorAttribute.cs
- Effect.cs
- InvalidAsynchronousStateException.cs
- DocumentViewerBase.cs
- SerializationObjectManager.cs
- FlowDocumentFormatter.cs
- ResizeGrip.cs
- Thread.cs
- WS2007FederationHttpBindingCollectionElement.cs
- ValidatorUtils.cs
- ConfigurationPropertyAttribute.cs
- DocumentAutomationPeer.cs
- LocalizeDesigner.cs
- CookielessHelper.cs
- SecurityPermission.cs
- WorkflowEventArgs.cs
- SrgsToken.cs
- CalloutQueueItem.cs
- SafeNativeMethodsMilCoreApi.cs
- GenericWebPart.cs
- MonthChangedEventArgs.cs
- EncryptedKeyIdentifierClause.cs
- ErrorsHelper.cs
- SecurityValidationBehavior.cs
- ProxySimple.cs
- ForwardPositionQuery.cs
- ASCIIEncoding.cs
- latinshape.cs
- WebPartConnectionsEventArgs.cs
- SecurityKeyEntropyMode.cs
- CodeValidator.cs
- DataStreams.cs
- XamlFxTrace.cs
- WebPartDescription.cs
- KeyGesture.cs
- EmbeddedMailObjectsCollection.cs
- Context.cs
- TextSelection.cs
- COM2ColorConverter.cs
- CustomLineCap.cs
- ServiceContractGenerationContext.cs
- SharedStatics.cs
- Parser.cs
- HtmlDocument.cs
- PrinterSettings.cs
- FileDialogCustomPlace.cs
- PointLightBase.cs
- ErrorStyle.cs
- DataGridViewButtonCell.cs
- WindowsListViewScroll.cs
- MarkupCompilePass2.cs
- QueryParameter.cs
- SoapObjectReader.cs
- IISMapPath.cs
- XmlEncodedRawTextWriter.cs
- MaskedTextProvider.cs
- XhtmlConformanceSection.cs
- TemplateXamlParser.cs
- TextEndOfSegment.cs
- OdbcConnectionOpen.cs
- SafeNativeMethods.cs
- DataGridViewSelectedColumnCollection.cs
- FormatPage.cs
- StringPropertyBuilder.cs
- IdentityValidationException.cs
- IgnoreFlushAndCloseStream.cs
- HttpApplication.cs
- HttpCapabilitiesBase.cs
- ReflectionPermission.cs
- XmlEnumAttribute.cs
- AccessDataSourceView.cs
- InvalidEnumArgumentException.cs
- SqlDependency.cs
- ComplexTypeEmitter.cs
- BinHexDecoder.cs
- SortedDictionary.cs
- GridEntryCollection.cs
- VisualTreeHelper.cs
- AdPostCacheSubstitution.cs
- WindowsComboBox.cs
- DbConnectionPoolIdentity.cs
- TcpConnectionPool.cs
- SupportsEventValidationAttribute.cs
- MsmqAppDomainProtocolHandler.cs
- HttpCookie.cs
- Help.cs