Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / Security / Cryptography / HMAC.cs / 5 / HMAC.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // HMAC.cs // // // For test vectors, see RFC2104, e.g. http://www.faqs.org/rfcs/rfc2104.html // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public abstract class HMAC : KeyedHashAlgorithm { // // protected members // // an HMAC uses a hash function where data is hashed by iterating a basic compression // function on blocks of data. BlockSizeValue is the byte size of such a block private int blockSizeValue = 64; protected int BlockSizeValue { get { return blockSizeValue; } set { blockSizeValue = value; } } internal string m_hashName; internal HashAlgorithm m_hash1; internal HashAlgorithm m_hash2; // // private members // // m_inner = PaddedKey ^ {0x36,...,0x36} // m_outer = PaddedKey ^ {0x5C,...,0x5C} private byte[] m_inner; private byte[] m_outer; private bool m_hashing = false; private void UpdateIOPadBuffers () { if (m_inner == null) m_inner = new byte[BlockSizeValue]; if (m_outer == null) m_outer = new byte[BlockSizeValue]; int i; for (i=0; i < BlockSizeValue; i++) { m_inner[i] = 0x36; m_outer[i] = 0x5C; } for (i=0; i < KeyValue.Length; i++) { m_inner[i] ^= KeyValue[i]; m_outer[i] ^= KeyValue[i]; } } internal void InitializeKey (byte[] key) { // When we change the key value, we'll need to update the initial values of the inner and outter // computation buffers. In the case of correct HMAC vs Whidbey HMAC, these buffers could get // generated to a different size than when we started. m_inner = null; m_outer = null; if (key.Length > BlockSizeValue) { KeyValue = m_hash1.ComputeHash(key); // No need to call Initialize, ComputeHash will do it for us } else { KeyValue = (byte[]) key.Clone(); } UpdateIOPadBuffers(); } // // public properties // public override byte[] Key { get { return (byte[]) KeyValue.Clone(); } set { if (m_hashing) throw new CryptographicException(Environment.GetResourceString("Cryptography_HashKeySet")); InitializeKey(value); } } public string HashName { get { return m_hashName; } set { if (m_hashing) throw new CryptographicException(Environment.GetResourceString("Cryptography_HashNameSet")); m_hashName = value; // create the hash algorithms m_hash1 = HashAlgorithm.Create(m_hashName); m_hash2 = HashAlgorithm.Create(m_hashName); } } // // public methods // new static public HMAC Create () { return Create("System.Security.Cryptography.HMAC"); } new static public HMAC Create (string algorithmName) { return (HMAC) CryptoConfig.CreateFromName(algorithmName); } public override void Initialize () { m_hash1.Initialize(); m_hash2.Initialize(); m_hashing = false; } protected override void HashCore (byte[] rgb, int ib, int cb) { if (m_hashing == false) { m_hash1.TransformBlock(m_inner, 0, m_inner.Length, m_inner, 0); m_hashing = true; } m_hash1.TransformBlock(rgb, ib, cb, rgb, ib); } protected override byte[] HashFinal () { if (m_hashing == false) { m_hash1.TransformBlock(m_inner, 0, m_inner.Length, m_inner, 0); m_hashing = true; } // finalize the original hash m_hash1.TransformFinalBlock(new byte[0], 0, 0); byte[] hashValue1 = m_hash1.HashValue; // write the outer array m_hash2.TransformBlock(m_outer, 0, m_outer.Length, m_outer, 0); // write the inner hash and finalize the hash m_hash2.TransformBlock(hashValue1, 0, hashValue1.Length, hashValue1, 0); m_hashing = false; m_hash2.TransformFinalBlock(new byte[0], 0, 0); return m_hash2.HashValue; } // // IDisposable methods // protected override void Dispose (bool disposing) { if (disposing) { if (m_hash1 != null) m_hash1.Clear(); if (m_hash2 != null) m_hash2.Clear(); if (m_inner != null) Array.Clear(m_inner, 0, m_inner.Length); if (m_outer != null) Array.Clear(m_outer, 0, m_outer.Length); } // call the base class's Dispose base.Dispose(disposing); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // HMAC.cs // // // For test vectors, see RFC2104, e.g. http://www.faqs.org/rfcs/rfc2104.html // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public abstract class HMAC : KeyedHashAlgorithm { // // protected members // // an HMAC uses a hash function where data is hashed by iterating a basic compression // function on blocks of data. BlockSizeValue is the byte size of such a block private int blockSizeValue = 64; protected int BlockSizeValue { get { return blockSizeValue; } set { blockSizeValue = value; } } internal string m_hashName; internal HashAlgorithm m_hash1; internal HashAlgorithm m_hash2; // // private members // // m_inner = PaddedKey ^ {0x36,...,0x36} // m_outer = PaddedKey ^ {0x5C,...,0x5C} private byte[] m_inner; private byte[] m_outer; private bool m_hashing = false; private void UpdateIOPadBuffers () { if (m_inner == null) m_inner = new byte[BlockSizeValue]; if (m_outer == null) m_outer = new byte[BlockSizeValue]; int i; for (i=0; i < BlockSizeValue; i++) { m_inner[i] = 0x36; m_outer[i] = 0x5C; } for (i=0; i < KeyValue.Length; i++) { m_inner[i] ^= KeyValue[i]; m_outer[i] ^= KeyValue[i]; } } internal void InitializeKey (byte[] key) { // When we change the key value, we'll need to update the initial values of the inner and outter // computation buffers. In the case of correct HMAC vs Whidbey HMAC, these buffers could get // generated to a different size than when we started. m_inner = null; m_outer = null; if (key.Length > BlockSizeValue) { KeyValue = m_hash1.ComputeHash(key); // No need to call Initialize, ComputeHash will do it for us } else { KeyValue = (byte[]) key.Clone(); } UpdateIOPadBuffers(); } // // public properties // public override byte[] Key { get { return (byte[]) KeyValue.Clone(); } set { if (m_hashing) throw new CryptographicException(Environment.GetResourceString("Cryptography_HashKeySet")); InitializeKey(value); } } public string HashName { get { return m_hashName; } set { if (m_hashing) throw new CryptographicException(Environment.GetResourceString("Cryptography_HashNameSet")); m_hashName = value; // create the hash algorithms m_hash1 = HashAlgorithm.Create(m_hashName); m_hash2 = HashAlgorithm.Create(m_hashName); } } // // public methods // new static public HMAC Create () { return Create("System.Security.Cryptography.HMAC"); } new static public HMAC Create (string algorithmName) { return (HMAC) CryptoConfig.CreateFromName(algorithmName); } public override void Initialize () { m_hash1.Initialize(); m_hash2.Initialize(); m_hashing = false; } protected override void HashCore (byte[] rgb, int ib, int cb) { if (m_hashing == false) { m_hash1.TransformBlock(m_inner, 0, m_inner.Length, m_inner, 0); m_hashing = true; } m_hash1.TransformBlock(rgb, ib, cb, rgb, ib); } protected override byte[] HashFinal () { if (m_hashing == false) { m_hash1.TransformBlock(m_inner, 0, m_inner.Length, m_inner, 0); m_hashing = true; } // finalize the original hash m_hash1.TransformFinalBlock(new byte[0], 0, 0); byte[] hashValue1 = m_hash1.HashValue; // write the outer array m_hash2.TransformBlock(m_outer, 0, m_outer.Length, m_outer, 0); // write the inner hash and finalize the hash m_hash2.TransformBlock(hashValue1, 0, hashValue1.Length, hashValue1, 0); m_hashing = false; m_hash2.TransformFinalBlock(new byte[0], 0, 0); return m_hash2.HashValue; } // // IDisposable methods // protected override void Dispose (bool disposing) { if (disposing) { if (m_hash1 != null) m_hash1.Clear(); if (m_hash2 != null) m_hash2.Clear(); if (m_inner != null) Array.Clear(m_inner, 0, m_inner.Length); if (m_outer != null) Array.Clear(m_outer, 0, m_outer.Length); } // call the base class's Dispose base.Dispose(disposing); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SettingsPropertyValue.cs
- DesignerMetadata.cs
- RecognizerInfo.cs
- BitmapEffectRenderDataResource.cs
- QueryRewriter.cs
- SqlFunctionAttribute.cs
- UserControlParser.cs
- GridEntry.cs
- InputLanguageSource.cs
- Control.cs
- ConfigurationProperty.cs
- DebuggerAttributes.cs
- ProfileSection.cs
- Exception.cs
- FieldTemplateUserControl.cs
- VectorAnimationBase.cs
- DoubleLink.cs
- XmlSchemaSimpleTypeUnion.cs
- ViewStateModeByIdAttribute.cs
- MemberHolder.cs
- InspectionWorker.cs
- GeneralTransform3DGroup.cs
- HttpPostLocalhostServerProtocol.cs
- ParserStreamGeometryContext.cs
- BoundsDrawingContextWalker.cs
- InstanceKeyView.cs
- LineVisual.cs
- CodeAttributeDeclarationCollection.cs
- RemoteWebConfigurationHostServer.cs
- FastEncoderWindow.cs
- FileFormatException.cs
- EventMappingSettingsCollection.cs
- OrderedEnumerableRowCollection.cs
- WebConfigurationManager.cs
- TypedRowHandler.cs
- CurrencyWrapper.cs
- PathParser.cs
- SecurityUtils.cs
- ObjectParameterCollection.cs
- DesignerActionUIService.cs
- AssemblyBuilderData.cs
- ValidatorCompatibilityHelper.cs
- SignedPkcs7.cs
- InputEventArgs.cs
- AcceptorSessionSymmetricTransportSecurityProtocol.cs
- GifBitmapEncoder.cs
- WebControlAdapter.cs
- CurrencyManager.cs
- GenericIdentity.cs
- PerformanceCounterPermissionEntryCollection.cs
- Utils.cs
- XmlLanguageConverter.cs
- CheckBoxField.cs
- HttpCacheParams.cs
- EntityProviderServices.cs
- ExpressionBindingCollection.cs
- AnnotationAuthorChangedEventArgs.cs
- BufferBuilder.cs
- CombinedTcpChannel.cs
- DrawingGroupDrawingContext.cs
- AppliedDeviceFiltersEditor.cs
- TokenBasedSet.cs
- BaseConfigurationRecord.cs
- ControlParameter.cs
- MetadataProperty.cs
- XamlTypeMapperSchemaContext.cs
- ValidatorAttribute.cs
- Win32Exception.cs
- ZipIOModeEnforcingStream.cs
- cookiecontainer.cs
- WebConfigManager.cs
- httpapplicationstate.cs
- ConnectionConsumerAttribute.cs
- smtpconnection.cs
- SystemColorTracker.cs
- XmlEventCache.cs
- NumberFormatter.cs
- PathGradientBrush.cs
- counter.cs
- COM2AboutBoxPropertyDescriptor.cs
- IpcClientChannel.cs
- CodeTypeConstructor.cs
- SignatureGenerator.cs
- DiagnosticStrings.cs
- SecuritySessionFilter.cs
- CodeTypeReferenceSerializer.cs
- TablePatternIdentifiers.cs
- XmlSchemaAttributeGroup.cs
- DesignerCategoryAttribute.cs
- Deflater.cs
- Condition.cs
- DebuggerAttributes.cs
- BitmapEffectState.cs
- NTAccount.cs
- COM2TypeInfoProcessor.cs
- EventMappingSettingsCollection.cs
- COMException.cs
- Int64Converter.cs
- XmlEntity.cs
- ContentPropertyAttribute.cs