Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / 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(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TrackingServices.cs
- Typeface.cs
- wgx_sdk_version.cs
- EmbossBitmapEffect.cs
- Version.cs
- DefaultValidator.cs
- JavascriptXmlWriterWrapper.cs
- _NTAuthentication.cs
- GuidelineSet.cs
- ComplexBindingPropertiesAttribute.cs
- Action.cs
- XmlNavigatorFilter.cs
- XmlSerializerSection.cs
- ExpressionBindingCollection.cs
- NameValueConfigurationCollection.cs
- ObjectDataSourceView.cs
- MembershipSection.cs
- BinaryKeyIdentifierClause.cs
- DataSetUtil.cs
- ZipIOFileItemStream.cs
- FixedBufferAttribute.cs
- OlePropertyStructs.cs
- Schema.cs
- ZoneMembershipCondition.cs
- ObsoleteAttribute.cs
- SupportsEventValidationAttribute.cs
- DataServiceQueryException.cs
- DataContract.cs
- __ComObject.cs
- EdmComplexPropertyAttribute.cs
- TransportConfigurationTypeElementCollection.cs
- TransformPatternIdentifiers.cs
- SqlDataSourceSelectingEventArgs.cs
- WebPartManagerInternals.cs
- CqlGenerator.cs
- CreateParams.cs
- BrowserCapabilitiesCodeGenerator.cs
- Double.cs
- DynamicRendererThreadManager.cs
- ExpressionEvaluator.cs
- Configuration.cs
- XmlSerializationGeneratedCode.cs
- MSG.cs
- DynamicValueConverter.cs
- Validator.cs
- EmptyStringExpandableObjectConverter.cs
- RectAnimationClockResource.cs
- Region.cs
- CodeIndexerExpression.cs
- WebPermission.cs
- ZipPackage.cs
- DataGridColumnHeaderAutomationPeer.cs
- CompModHelpers.cs
- XmlParserContext.cs
- XmlDocumentType.cs
- FreezableCollection.cs
- PagedDataSource.cs
- XmlDeclaration.cs
- SQLDateTimeStorage.cs
- CustomWebEventKey.cs
- TableCell.cs
- XmlSchemaImport.cs
- FormsAuthenticationModule.cs
- EventProvider.cs
- securitycriticaldata.cs
- BamlLocalizationDictionary.cs
- ProcessInfo.cs
- Helpers.cs
- ErrorFormatterPage.cs
- ItemCollection.cs
- PropertyGridView.cs
- ColumnTypeConverter.cs
- TransformationRules.cs
- ServiceObjectContainer.cs
- LogLogRecordHeader.cs
- WindowsListView.cs
- TabPanel.cs
- Section.cs
- StatusBarPanel.cs
- CompilerParameters.cs
- DataServiceException.cs
- DataControlImageButton.cs
- MetadataArtifactLoaderXmlReaderWrapper.cs
- InvalidDataException.cs
- SessionStateUtil.cs
- WpfWebRequestHelper.cs
- OdbcRowUpdatingEvent.cs
- CategoryGridEntry.cs
- DbExpressionVisitor_TResultType.cs
- PropertyEmitter.cs
- XmlSerializerSection.cs
- PeerNameRecord.cs
- DrawTreeNodeEventArgs.cs
- Win32PrintDialog.cs
- FillBehavior.cs
- OracleConnectionString.cs
- UserControlParser.cs
- SQLStringStorage.cs
- RecognizeCompletedEventArgs.cs
- DataColumnMappingCollection.cs