Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / Security / Cryptography / DES.cs / 1 / DES.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // DES.cs // namespace System.Security.Cryptography { using System; [System.Runtime.InteropServices.ComVisible(true)] public abstract class DES : SymmetricAlgorithm { private static KeySizes[] s_legalBlockSizes = { new KeySizes(64, 64, 0) }; private static KeySizes[] s_legalKeySizes = { new KeySizes(64, 64, 0) }; // // protected constructors // protected DES() { KeySizeValue = 64; BlockSizeValue = 64; FeedbackSizeValue = BlockSizeValue; LegalBlockSizesValue = s_legalBlockSizes; LegalKeySizesValue = s_legalKeySizes; } // // public properties // public override byte[] Key { get { if (KeyValue == null) { // Never hand back a weak or semi-weak key do { GenerateKey(); } while (IsWeakKey(KeyValue) || IsSemiWeakKey(KeyValue)); } return (byte[]) KeyValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); if (!ValidKeySize(value.Length * 8)) { // must convert bytes to bits throw new ArgumentException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } if (IsWeakKey(value)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); } if (IsSemiWeakKey(value)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); } KeyValue = (byte[]) value.Clone(); KeySizeValue = value.Length * 8; } } // // public methods // new static public DES Create() { return Create("System.Security.Cryptography.DES"); } new static public DES Create(String algName) { return (DES) CryptoConfig.CreateFromName(algName); } public static bool IsWeakKey(byte[] rgbKey) { if (!IsLegalKeySize(rgbKey)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } byte[] rgbOddParityKey = Utils.FixupKeyParity(rgbKey); UInt64 key = QuadWordFromBigEndian(rgbOddParityKey); if ((key == 0x0101010101010101) || (key == 0xfefefefefefefefe) || (key == 0x1f1f1f1f0e0e0e0e) || (key == 0xe0e0e0e0f1f1f1f1)) { return(true); } return(false); } public static bool IsSemiWeakKey(byte[] rgbKey) { if (!IsLegalKeySize(rgbKey)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } byte[] rgbOddParityKey = Utils.FixupKeyParity(rgbKey); UInt64 key = QuadWordFromBigEndian(rgbOddParityKey); if ((key == 0x01fe01fe01fe01fe) || (key == 0xfe01fe01fe01fe01) || (key == 0x1fe01fe00ef10ef1) || (key == 0xe01fe01ff10ef10e) || (key == 0x01e001e001f101f1) || (key == 0xe001e001f101f101) || (key == 0x1ffe1ffe0efe0efe) || (key == 0xfe1ffe1ffe0efe0e) || (key == 0x011f011f010e010e) || (key == 0x1f011f010e010e01) || (key == 0xe0fee0fef1fef1fe) || (key == 0xfee0fee0fef1fef1)) { return(true); } return(false); } // // private methods // private static bool IsLegalKeySize(byte[] rgbKey) { if (rgbKey != null && rgbKey.Length == 8) return(true); return(false); } private static UInt64 QuadWordFromBigEndian(byte[] block) { UInt64 x; x = ( (((UInt64)block[0]) << 56) | (((UInt64)block[1]) << 48) | (((UInt64)block[2]) << 40) | (((UInt64)block[3]) << 32) | (((UInt64)block[4]) << 24) | (((UInt64)block[5]) << 16) | (((UInt64)block[6]) << 8) | ((UInt64)block[7]) ); return(x); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // DES.cs // namespace System.Security.Cryptography { using System; [System.Runtime.InteropServices.ComVisible(true)] public abstract class DES : SymmetricAlgorithm { private static KeySizes[] s_legalBlockSizes = { new KeySizes(64, 64, 0) }; private static KeySizes[] s_legalKeySizes = { new KeySizes(64, 64, 0) }; // // protected constructors // protected DES() { KeySizeValue = 64; BlockSizeValue = 64; FeedbackSizeValue = BlockSizeValue; LegalBlockSizesValue = s_legalBlockSizes; LegalKeySizesValue = s_legalKeySizes; } // // public properties // public override byte[] Key { get { if (KeyValue == null) { // Never hand back a weak or semi-weak key do { GenerateKey(); } while (IsWeakKey(KeyValue) || IsSemiWeakKey(KeyValue)); } return (byte[]) KeyValue.Clone(); } set { if (value == null) throw new ArgumentNullException("value"); if (!ValidKeySize(value.Length * 8)) { // must convert bytes to bits throw new ArgumentException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } if (IsWeakKey(value)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); } if (IsSemiWeakKey(value)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); } KeyValue = (byte[]) value.Clone(); KeySizeValue = value.Length * 8; } } // // public methods // new static public DES Create() { return Create("System.Security.Cryptography.DES"); } new static public DES Create(String algName) { return (DES) CryptoConfig.CreateFromName(algName); } public static bool IsWeakKey(byte[] rgbKey) { if (!IsLegalKeySize(rgbKey)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } byte[] rgbOddParityKey = Utils.FixupKeyParity(rgbKey); UInt64 key = QuadWordFromBigEndian(rgbOddParityKey); if ((key == 0x0101010101010101) || (key == 0xfefefefefefefefe) || (key == 0x1f1f1f1f0e0e0e0e) || (key == 0xe0e0e0e0f1f1f1f1)) { return(true); } return(false); } public static bool IsSemiWeakKey(byte[] rgbKey) { if (!IsLegalKeySize(rgbKey)) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); } byte[] rgbOddParityKey = Utils.FixupKeyParity(rgbKey); UInt64 key = QuadWordFromBigEndian(rgbOddParityKey); if ((key == 0x01fe01fe01fe01fe) || (key == 0xfe01fe01fe01fe01) || (key == 0x1fe01fe00ef10ef1) || (key == 0xe01fe01ff10ef10e) || (key == 0x01e001e001f101f1) || (key == 0xe001e001f101f101) || (key == 0x1ffe1ffe0efe0efe) || (key == 0xfe1ffe1ffe0efe0e) || (key == 0x011f011f010e010e) || (key == 0x1f011f010e010e01) || (key == 0xe0fee0fef1fef1fe) || (key == 0xfee0fee0fef1fef1)) { return(true); } return(false); } // // private methods // private static bool IsLegalKeySize(byte[] rgbKey) { if (rgbKey != null && rgbKey.Length == 8) return(true); return(false); } private static UInt64 QuadWordFromBigEndian(byte[] block) { UInt64 x; x = ( (((UInt64)block[0]) << 56) | (((UInt64)block[1]) << 48) | (((UInt64)block[2]) << 40) | (((UInt64)block[3]) << 32) | (((UInt64)block[4]) << 24) | (((UInt64)block[5]) << 16) | (((UInt64)block[6]) << 8) | ((UInt64)block[7]) ); return(x); } } } // 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
- DesignTimeXamlWriter.cs
- WeakReference.cs
- StringReader.cs
- SystemInformation.cs
- XmlCharCheckingWriter.cs
- MouseButton.cs
- SetUserPreferenceRequest.cs
- TableCellsCollectionEditor.cs
- MaskDesignerDialog.cs
- IItemContainerGenerator.cs
- Imaging.cs
- DrawingGroup.cs
- HandleValueEditor.cs
- ArrayConverter.cs
- SqlCacheDependencySection.cs
- PresentationAppDomainManager.cs
- TextTreeUndo.cs
- CustomErrorCollection.cs
- DecoderReplacementFallback.cs
- SqlDataSourceConfigureSortForm.cs
- TypeToArgumentTypeConverter.cs
- DrawListViewSubItemEventArgs.cs
- SafeSecurityHandles.cs
- ChtmlImageAdapter.cs
- QueryOperationResponseOfT.cs
- Condition.cs
- ServerValidateEventArgs.cs
- CultureInfo.cs
- BulletedListDesigner.cs
- UserControlDesigner.cs
- DataGridViewRowStateChangedEventArgs.cs
- ArraySortHelper.cs
- StringFreezingAttribute.cs
- ScrollBar.cs
- ToolStripContentPanelRenderEventArgs.cs
- TaskbarItemInfo.cs
- Root.cs
- SmiRecordBuffer.cs
- CustomUserNameSecurityTokenAuthenticator.cs
- SqlProviderServices.cs
- ConditionalAttribute.cs
- ScriptReferenceBase.cs
- QilFunction.cs
- DesignerEventService.cs
- RightNameExpirationInfoPair.cs
- safelinkcollection.cs
- HttpConfigurationContext.cs
- CodeDomSerializer.cs
- AutoResizedEvent.cs
- AutomationPatternInfo.cs
- CodeGen.cs
- AttributedMetaModel.cs
- Memoizer.cs
- Polyline.cs
- Encoder.cs
- TcpStreams.cs
- AbstractExpressions.cs
- DataRowView.cs
- KnownIds.cs
- TimerEventSubscription.cs
- ServiceModelConfigurationSectionCollection.cs
- DataBoundControlParameterTarget.cs
- WebServiceHost.cs
- ExceptionList.cs
- HttpApplication.cs
- PagesSection.cs
- _CacheStreams.cs
- ApplicationDirectory.cs
- SymbolTable.cs
- WsdlParser.cs
- Vertex.cs
- ToolStripContainerActionList.cs
- ConvertersCollection.cs
- ExpandSegmentCollection.cs
- TransportSecurityProtocolFactory.cs
- IgnoreSection.cs
- FontWeightConverter.cs
- CubicEase.cs
- Variant.cs
- UserPersonalizationStateInfo.cs
- InfoCardRSAOAEPKeyExchangeFormatter.cs
- EntityProviderFactory.cs
- DPCustomTypeDescriptor.cs
- Mutex.cs
- SqlXml.cs
- Adorner.cs
- UInt32.cs
- Registry.cs
- MethodResolver.cs
- BooleanToSelectiveScrollingOrientationConverter.cs
- ErrorFormatterPage.cs
- SessionStateUtil.cs
- BitmapEffectvisualstate.cs
- RuleInfoComparer.cs
- AssemblyAssociatedContentFileAttribute.cs
- ContractAdapter.cs
- ClientWindowsAuthenticationMembershipProvider.cs
- XmlCharCheckingReader.cs
- ColorDialog.cs
- Duration.cs