Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Cryptography / SymmetricAlgorithm.cs / 1305376 / SymmetricAlgorithm.cs
using System.Diagnostics.Contracts; // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // SymmetricAlgorithm.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public abstract class SymmetricAlgorithm : IDisposable { protected int BlockSizeValue; protected int FeedbackSizeValue; protected byte[] IVValue; protected byte[] KeyValue; protected KeySizes[] LegalBlockSizesValue; protected KeySizes[] LegalKeySizesValue; protected int KeySizeValue; protected CipherMode ModeValue; protected PaddingMode PaddingValue; // // protected constructors // protected SymmetricAlgorithm() { // Default to cipher block chaining (CipherMode.CBC) and // PKCS-style padding (pad n bytes with value n) ModeValue = CipherMode.CBC; PaddingValue = PaddingMode.PKCS7; } // SymmetricAlgorithm implements IDisposable // To keep mscorlib compatibility with Orcas, CoreCLR's SymmetricAlgorithm 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) { // Note: we always want to zeroize the sensitive key material if (KeyValue != null) { Array.Clear(KeyValue, 0, KeyValue.Length); KeyValue = null; } if (IVValue != null) { Array.Clear(IVValue, 0, IVValue.Length); IVValue = null; } } } // // public properties // public virtual int BlockSize { get { return BlockSizeValue; } set { int i; int j; for (i=0; iBlockSizeValue || (value % 8) != 0) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFeedbackSize")); FeedbackSizeValue = value; } } public virtual byte[] IV { get { if (IVValue == null) GenerateIV(); return (byte[]) IVValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); Contract.EndContractBlock(); if (value.Length != BlockSizeValue / 8) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidIVSize")); IVValue = (byte[]) value.Clone(); } } public virtual byte[] Key { get { if (KeyValue == null) GenerateKey(); return (byte[]) KeyValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); Contract.EndContractBlock(); if (!ValidKeySize(value.Length * 8)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); // must convert bytes to bits KeyValue = (byte[]) value.Clone(); KeySizeValue = value.Length * 8; } } public virtual KeySizes[] LegalBlockSizes { get { return (KeySizes[]) LegalBlockSizesValue.Clone(); } } public virtual KeySizes[] LegalKeySizes { get { return (KeySizes[]) LegalKeySizesValue.Clone(); } } public virtual int KeySize { get { return KeySizeValue; } set { if (!ValidKeySize(value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); KeySizeValue = value; KeyValue = null; } } public virtual CipherMode Mode { get { return ModeValue; } set { if ((value < CipherMode.CBC) || (CipherMode.CFB < value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidCipherMode")); ModeValue = value; } } public virtual PaddingMode Padding { get { return PaddingValue; } set { if ((value < PaddingMode.None) || (PaddingMode.ISO10126 < value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidPaddingMode")); PaddingValue = value; } } // // public methods // // The following method takes a bit length input and returns whether that length is a valid size // according to LegalKeySizes public bool ValidKeySize(int bitLength) { KeySizes[] validSizes = this.LegalKeySizes; int i,j; if (validSizes == null) return false; for (i=0; i< validSizes.Length; i++) { if (validSizes[i].SkipSize == 0) { if (validSizes[i].MinSize == bitLength) { // assume MinSize = MaxSize return true; } } else { for (j = validSizes[i].MinSize; j<= validSizes[i].MaxSize; j += validSizes[i].SkipSize) { if (j == bitLength) { return true; } } } } return false; } [System.Security.SecuritySafeCritical] // auto-generated static public SymmetricAlgorithm Create() { // use the crypto config system to return an instance of // the default SymmetricAlgorithm on this machine return Create("System.Security.Cryptography.SymmetricAlgorithm"); } [System.Security.SecuritySafeCritical] // auto-generated static public SymmetricAlgorithm Create(String algName) { return (SymmetricAlgorithm) CryptoConfig.CreateFromName(algName); } public virtual ICryptoTransform CreateEncryptor() { return CreateEncryptor(Key, IV); } public abstract ICryptoTransform CreateEncryptor(byte[] rgbKey, byte[] rgbIV); public virtual ICryptoTransform CreateDecryptor() { return CreateDecryptor(Key, IV); } public abstract ICryptoTransform CreateDecryptor(byte[] rgbKey, byte[] rgbIV); public abstract void GenerateKey(); public abstract void GenerateIV(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System.Diagnostics.Contracts; // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // [....] // // // SymmetricAlgorithm.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public abstract class SymmetricAlgorithm : IDisposable { protected int BlockSizeValue; protected int FeedbackSizeValue; protected byte[] IVValue; protected byte[] KeyValue; protected KeySizes[] LegalBlockSizesValue; protected KeySizes[] LegalKeySizesValue; protected int KeySizeValue; protected CipherMode ModeValue; protected PaddingMode PaddingValue; // // protected constructors // protected SymmetricAlgorithm() { // Default to cipher block chaining (CipherMode.CBC) and // PKCS-style padding (pad n bytes with value n) ModeValue = CipherMode.CBC; PaddingValue = PaddingMode.PKCS7; } // SymmetricAlgorithm implements IDisposable // To keep mscorlib compatibility with Orcas, CoreCLR's SymmetricAlgorithm 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) { // Note: we always want to zeroize the sensitive key material if (KeyValue != null) { Array.Clear(KeyValue, 0, KeyValue.Length); KeyValue = null; } if (IVValue != null) { Array.Clear(IVValue, 0, IVValue.Length); IVValue = null; } } } // // public properties // public virtual int BlockSize { get { return BlockSizeValue; } set { int i; int j; for (i=0; iBlockSizeValue || (value % 8) != 0) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFeedbackSize")); FeedbackSizeValue = value; } } public virtual byte[] IV { get { if (IVValue == null) GenerateIV(); return (byte[]) IVValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); Contract.EndContractBlock(); if (value.Length != BlockSizeValue / 8) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidIVSize")); IVValue = (byte[]) value.Clone(); } } public virtual byte[] Key { get { if (KeyValue == null) GenerateKey(); return (byte[]) KeyValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); Contract.EndContractBlock(); if (!ValidKeySize(value.Length * 8)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); // must convert bytes to bits KeyValue = (byte[]) value.Clone(); KeySizeValue = value.Length * 8; } } public virtual KeySizes[] LegalBlockSizes { get { return (KeySizes[]) LegalBlockSizesValue.Clone(); } } public virtual KeySizes[] LegalKeySizes { get { return (KeySizes[]) LegalKeySizesValue.Clone(); } } public virtual int KeySize { get { return KeySizeValue; } set { if (!ValidKeySize(value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); KeySizeValue = value; KeyValue = null; } } public virtual CipherMode Mode { get { return ModeValue; } set { if ((value < CipherMode.CBC) || (CipherMode.CFB < value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidCipherMode")); ModeValue = value; } } public virtual PaddingMode Padding { get { return PaddingValue; } set { if ((value < PaddingMode.None) || (PaddingMode.ISO10126 < value)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidPaddingMode")); PaddingValue = value; } } // // public methods // // The following method takes a bit length input and returns whether that length is a valid size // according to LegalKeySizes public bool ValidKeySize(int bitLength) { KeySizes[] validSizes = this.LegalKeySizes; int i,j; if (validSizes == null) return false; for (i=0; i< validSizes.Length; i++) { if (validSizes[i].SkipSize == 0) { if (validSizes[i].MinSize == bitLength) { // assume MinSize = MaxSize return true; } } else { for (j = validSizes[i].MinSize; j<= validSizes[i].MaxSize; j += validSizes[i].SkipSize) { if (j == bitLength) { return true; } } } } return false; } [System.Security.SecuritySafeCritical] // auto-generated static public SymmetricAlgorithm Create() { // use the crypto config system to return an instance of // the default SymmetricAlgorithm on this machine return Create("System.Security.Cryptography.SymmetricAlgorithm"); } [System.Security.SecuritySafeCritical] // auto-generated static public SymmetricAlgorithm Create(String algName) { return (SymmetricAlgorithm) CryptoConfig.CreateFromName(algName); } public virtual ICryptoTransform CreateEncryptor() { return CreateEncryptor(Key, IV); } public abstract ICryptoTransform CreateEncryptor(byte[] rgbKey, byte[] rgbIV); public virtual ICryptoTransform CreateDecryptor() { return CreateDecryptor(Key, IV); } public abstract ICryptoTransform CreateDecryptor(byte[] rgbKey, byte[] rgbIV); public abstract void GenerateKey(); public abstract void GenerateIV(); } } // 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
- ProcessHostMapPath.cs
- EnumerableCollectionView.cs
- ChtmlTextWriter.cs
- BitmapEffectGroup.cs
- GuidelineSet.cs
- GenericsNotImplementedException.cs
- XmlSerializerOperationGenerator.cs
- MetadataSource.cs
- mediaeventargs.cs
- TcpChannelFactory.cs
- ClaimTypes.cs
- SortedSet.cs
- unsafenativemethodstextservices.cs
- SoapSchemaImporter.cs
- WebPartConnectionsCancelEventArgs.cs
- WindowsFormsLinkLabel.cs
- TextServicesDisplayAttribute.cs
- RegexStringValidator.cs
- FileUtil.cs
- ResourceDictionaryCollection.cs
- GridViewSortEventArgs.cs
- EntityViewGenerator.cs
- SecurityUtils.cs
- DataObject.cs
- PrinterResolution.cs
- XsltLibrary.cs
- TempFiles.cs
- TrustManagerPromptUI.cs
- Nullable.cs
- SamlAssertionKeyIdentifierClause.cs
- MappingMetadataHelper.cs
- IODescriptionAttribute.cs
- controlskin.cs
- ThreadStartException.cs
- DocumentViewerBase.cs
- ExpressionVisitor.cs
- ButtonColumn.cs
- Highlights.cs
- DocumentCollection.cs
- GridViewPageEventArgs.cs
- EnumValAlphaComparer.cs
- Screen.cs
- BamlLocalizableResource.cs
- PropertyChangedEventManager.cs
- invalidudtexception.cs
- MissingFieldException.cs
- AuthenticationModulesSection.cs
- MbpInfo.cs
- CroppedBitmap.cs
- HandledEventArgs.cs
- AmbientProperties.cs
- XmlNamedNodeMap.cs
- CompositeFontParser.cs
- WindowsListViewItemCheckBox.cs
- ReturnValue.cs
- XmlNodeReader.cs
- DocumentApplicationState.cs
- SqlMethods.cs
- XmlAttributes.cs
- CryptoKeySecurity.cs
- ReadOnlyDataSource.cs
- ServicePointManager.cs
- QueryContinueDragEvent.cs
- BitmapEffectDrawing.cs
- MemberMaps.cs
- NameValueConfigurationElement.cs
- PictureBoxDesigner.cs
- ToolStripDropDownClosingEventArgs.cs
- ElementHostAutomationPeer.cs
- ConfigurationProperty.cs
- ExternalException.cs
- mediaeventshelper.cs
- CqlBlock.cs
- RowsCopiedEventArgs.cs
- COM2ExtendedBrowsingHandler.cs
- XmlAutoDetectWriter.cs
- HttpProfileBase.cs
- Compiler.cs
- DrawingState.cs
- KeyConverter.cs
- GridViewAutomationPeer.cs
- OdbcConnectionString.cs
- FixedSOMImage.cs
- HttpModulesSection.cs
- DelegateArgumentReference.cs
- ExtensionSimplifierMarkupObject.cs
- XmlReaderSettings.cs
- InputLanguageProfileNotifySink.cs
- FormViewDeleteEventArgs.cs
- ThreadStartException.cs
- ResourceManager.cs
- XmlArrayItemAttribute.cs
- CompilerGeneratedAttribute.cs
- XPathParser.cs
- WebPartTransformer.cs
- HTTPNotFoundHandler.cs
- AdornerPresentationContext.cs
- DependencyPropertyDescriptor.cs
- Comparer.cs
- CodeGenerator.cs