Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / 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
- TextBlock.cs
- CodePageEncoding.cs
- SessionState.cs
- Maps.cs
- RichTextBoxConstants.cs
- CollectionExtensions.cs
- HeaderedContentControl.cs
- ColumnMapCopier.cs
- CaseExpr.cs
- DocumentSequence.cs
- PageThemeParser.cs
- HostVisual.cs
- ForwardPositionQuery.cs
- IProvider.cs
- PackageDigitalSignatureManager.cs
- SiteMapNode.cs
- SubMenuStyleCollectionEditor.cs
- FilterQueryOptionExpression.cs
- OdbcParameterCollection.cs
- ChannelServices.cs
- GroupItem.cs
- TraceHandler.cs
- MsmqIntegrationValidationBehavior.cs
- ContentOperations.cs
- EmptyCollection.cs
- XmlNodeList.cs
- LabelEditEvent.cs
- BaseTemplateCodeDomTreeGenerator.cs
- CallSiteHelpers.cs
- RequestCachingSection.cs
- ToolboxItemLoader.cs
- TableLayout.cs
- CommandConverter.cs
- FileEnumerator.cs
- SqlMultiplexer.cs
- Path.cs
- PageFunction.cs
- Bold.cs
- DuplicateDetector.cs
- RenderingEventArgs.cs
- AccessDataSourceView.cs
- NominalTypeEliminator.cs
- ProjectionPlanCompiler.cs
- _NetworkingPerfCounters.cs
- CompositeDesignerAccessibleObject.cs
- MessageDesigner.cs
- XmlSchemaInfo.cs
- SoapServerProtocol.cs
- ListenerChannelContext.cs
- XmlQueryRuntime.cs
- Int32Rect.cs
- CqlIdentifiers.cs
- MDIControlStrip.cs
- DateTimeConstantAttribute.cs
- Pens.cs
- DataStreams.cs
- AnnotationResourceChangedEventArgs.cs
- VisualStyleElement.cs
- ScrollChrome.cs
- SqlDataSourceStatusEventArgs.cs
- XmlResolver.cs
- RightNameExpirationInfoPair.cs
- TableStyle.cs
- ContainerControl.cs
- LazyTextWriterCreator.cs
- WS2007HttpBindingElement.cs
- WindowsTokenRoleProvider.cs
- Stylesheet.cs
- CapacityStreamGeometryContext.cs
- SqlNotificationEventArgs.cs
- TreeViewEvent.cs
- PassportAuthenticationEventArgs.cs
- embossbitmapeffect.cs
- ValidationEventArgs.cs
- PropertyGeneratedEventArgs.cs
- DbConnectionPoolCounters.cs
- XmlDocument.cs
- SerializationEventsCache.cs
- typedescriptorpermission.cs
- PieceNameHelper.cs
- GeneralTransform3D.cs
- ReadWriteSpinLock.cs
- ImportContext.cs
- NavigationProperty.cs
- SessionEndingEventArgs.cs
- PersonalizationState.cs
- SingleObjectCollection.cs
- StringFunctions.cs
- TrustManagerMoreInformation.cs
- ObjectPersistData.cs
- IssuedTokenParametersEndpointAddressElement.cs
- ValidatorCompatibilityHelper.cs
- PropertyMapper.cs
- ListItemsPage.cs
- CultureInfoConverter.cs
- EmptyControlCollection.cs
- DeferredTextReference.cs
- BindingManagerDataErrorEventArgs.cs
- DelayLoadType.cs
- BookmarkNameHelper.cs