Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / clr / src / BCL / System / Security / Cryptography / DESCryptoServiceProvider.cs / 1 / DESCryptoServiceProvider.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // DESCryptoServiceProvider.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public sealed class DESCryptoServiceProvider : DES { // // public constructors // public DESCryptoServiceProvider () { if (!Utils.HasAlgorithm(Constants.CALG_DES, 0)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_AlgorithmNotAvailable")); // Since the CSP only supports a CFB feedback of 8, make that the default FeedbackSizeValue = 8; } // // public methods // public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV) { if (IsWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); if (IsSemiWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Encrypt); } public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV) { if (IsWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); if (IsSemiWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Decrypt); } public override void GenerateKey () { KeyValue = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); // Never hand back a weak or semi-weak key while (DES.IsWeakKey(KeyValue) || DES.IsSemiWeakKey(KeyValue)) { Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); } } public override void GenerateIV () { IVValue = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(IVValue); } // // private methods // private ICryptoTransform _NewEncryptor (byte[] rgbKey, CipherMode mode, byte[] rgbIV, int feedbackSize, CryptoAPITransformMode encryptMode) { int cArgs = 0; int[] rgArgIds = new int[10]; Object[] rgArgValues = new Object[10]; // Check for bad values // 1) we don't support OFB mode in DESCryptoServiceProvider if (mode == CipherMode.OFB) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_OFBNotSupported")); // 2) we only support CFB with a feedback size of 8 bits if ((mode == CipherMode.CFB) && (feedbackSize != 8)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CFBSizeNotSupported")); // Build the key if one does not already exist if (rgbKey == null) { rgbKey = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(rgbKey); } // Set the mode for the encryptor (defaults to CBC) if (mode != CipherMode.CBC) { rgArgIds[cArgs] = Constants.KP_MODE; rgArgValues[cArgs] = mode; cArgs += 1; } // If not ECB mode -- pass in an IV if (mode != CipherMode.ECB) { if (rgbIV == null) { rgbIV = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(rgbIV); } // // We truncate IV's that are longer than the block size to 8 bytes : this is // done to maintain backward compatibility with the behavior shipped in V1.x. // The call to set the IV in CryptoAPI will ignore any bytes after the first 8 // bytes. We'll still reject IV's that are shorter than the block size though. // if (rgbIV.Length < 8) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidIVSize")); rgArgIds[cArgs] = Constants.KP_IV; rgArgValues[cArgs] = rgbIV; cArgs += 1; } // If doing OFB or CFB, then we need to set the feed back loop size if ((mode == CipherMode.OFB) || (mode == CipherMode.CFB)) { rgArgIds[cArgs] = Constants.KP_MODE_BITS; rgArgValues[cArgs] = feedbackSize; cArgs += 1; } // Create the encryptpr/decryptor object return new CryptoAPITransform(Constants.CALG_DES, cArgs, rgArgIds, rgArgValues, rgbKey, PaddingValue, mode, BlockSizeValue, feedbackSize, false, encryptMode); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // DESCryptoServiceProvider.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public sealed class DESCryptoServiceProvider : DES { // // public constructors // public DESCryptoServiceProvider () { if (!Utils.HasAlgorithm(Constants.CALG_DES, 0)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_AlgorithmNotAvailable")); // Since the CSP only supports a CFB feedback of 8, make that the default FeedbackSizeValue = 8; } // // public methods // public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV) { if (IsWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); if (IsSemiWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Encrypt); } public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV) { if (IsWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_Weak"),"DES"); if (IsSemiWeakKey(rgbKey)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKey_SemiWeak"),"DES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Decrypt); } public override void GenerateKey () { KeyValue = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); // Never hand back a weak or semi-weak key while (DES.IsWeakKey(KeyValue) || DES.IsSemiWeakKey(KeyValue)) { Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); } } public override void GenerateIV () { IVValue = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(IVValue); } // // private methods // private ICryptoTransform _NewEncryptor (byte[] rgbKey, CipherMode mode, byte[] rgbIV, int feedbackSize, CryptoAPITransformMode encryptMode) { int cArgs = 0; int[] rgArgIds = new int[10]; Object[] rgArgValues = new Object[10]; // Check for bad values // 1) we don't support OFB mode in DESCryptoServiceProvider if (mode == CipherMode.OFB) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_OFBNotSupported")); // 2) we only support CFB with a feedback size of 8 bits if ((mode == CipherMode.CFB) && (feedbackSize != 8)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CFBSizeNotSupported")); // Build the key if one does not already exist if (rgbKey == null) { rgbKey = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(rgbKey); } // Set the mode for the encryptor (defaults to CBC) if (mode != CipherMode.CBC) { rgArgIds[cArgs] = Constants.KP_MODE; rgArgValues[cArgs] = mode; cArgs += 1; } // If not ECB mode -- pass in an IV if (mode != CipherMode.ECB) { if (rgbIV == null) { rgbIV = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(rgbIV); } // // We truncate IV's that are longer than the block size to 8 bytes : this is // done to maintain backward compatibility with the behavior shipped in V1.x. // The call to set the IV in CryptoAPI will ignore any bytes after the first 8 // bytes. We'll still reject IV's that are shorter than the block size though. // if (rgbIV.Length < 8) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidIVSize")); rgArgIds[cArgs] = Constants.KP_IV; rgArgValues[cArgs] = rgbIV; cArgs += 1; } // If doing OFB or CFB, then we need to set the feed back loop size if ((mode == CipherMode.OFB) || (mode == CipherMode.CFB)) { rgArgIds[cArgs] = Constants.KP_MODE_BITS; rgArgValues[cArgs] = feedbackSize; cArgs += 1; } // Create the encryptpr/decryptor object return new CryptoAPITransform(Constants.CALG_DES, cArgs, rgArgIds, rgArgValues, rgbKey, PaddingValue, mode, BlockSizeValue, feedbackSize, false, encryptMode); } } } // 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
- ColumnHeader.cs
- MemberInfoSerializationHolder.cs
- DrawListViewItemEventArgs.cs
- StylusPointPropertyInfo.cs
- AutoGeneratedFieldProperties.cs
- KeyFrames.cs
- CodeAttributeDeclarationCollection.cs
- RegexRunnerFactory.cs
- DataGridItemCollection.cs
- CodeArgumentReferenceExpression.cs
- FontWeight.cs
- BridgeDataReader.cs
- TextLine.cs
- ItemList.cs
- TextDecorationCollectionConverter.cs
- ScrollChrome.cs
- TrustManagerMoreInformation.cs
- InputEventArgs.cs
- UseAttributeSetsAction.cs
- unitconverter.cs
- SimpleFileLog.cs
- Image.cs
- _FtpControlStream.cs
- Int32KeyFrameCollection.cs
- BinaryWriter.cs
- BinaryFormatterWriter.cs
- ContextMenu.cs
- SharedPersonalizationStateInfo.cs
- WindowsListViewGroup.cs
- XsltLoader.cs
- TextParentUndoUnit.cs
- ClientCredentialsElement.cs
- Timer.cs
- CustomError.cs
- CodeIdentifiers.cs
- odbcmetadatacolumnnames.cs
- DiagnosticTrace.cs
- SourceFilter.cs
- CodeMethodInvokeExpression.cs
- EncryptedKeyHashIdentifierClause.cs
- ExtendedPropertyDescriptor.cs
- WinEventWrap.cs
- CatalogPartChrome.cs
- DataMisalignedException.cs
- DockAndAnchorLayout.cs
- SoapCodeExporter.cs
- CodeTypeMemberCollection.cs
- ScriptingRoleServiceSection.cs
- IPPacketInformation.cs
- FirstMatchCodeGroup.cs
- SettingsPropertyValue.cs
- SmiSettersStream.cs
- XslAstAnalyzer.cs
- CodeAttachEventStatement.cs
- RSAPKCS1SignatureFormatter.cs
- ObjectContext.cs
- PointConverter.cs
- MouseGesture.cs
- DbSourceParameterCollection.cs
- CancelRequestedQuery.cs
- InternalRelationshipCollection.cs
- AuthenticationSection.cs
- AnnotationAdorner.cs
- Utils.cs
- UpdateCompiler.cs
- HideDisabledControlAdapter.cs
- ObjectStateFormatter.cs
- HtmlTableRowCollection.cs
- ListSortDescription.cs
- ReferenceTypeElement.cs
- ToolStripItemEventArgs.cs
- NavigationProgressEventArgs.cs
- CodeArrayCreateExpression.cs
- OleDbInfoMessageEvent.cs
- Int32CAMarshaler.cs
- DeploymentExceptionMapper.cs
- SerializationInfoEnumerator.cs
- WebInvokeAttribute.cs
- ContractCodeDomInfo.cs
- ProviderConnectionPoint.cs
- WebEvents.cs
- GeometryHitTestParameters.cs
- MenuRendererClassic.cs
- SlipBehavior.cs
- RichTextBoxAutomationPeer.cs
- ProfileGroupSettingsCollection.cs
- QueryResult.cs
- GPRECT.cs
- NativeObjectSecurity.cs
- MediaCommands.cs
- TraceContextRecord.cs
- TypedAsyncResult.cs
- HtmlTableCell.cs
- DeferrableContent.cs
- XmlArrayAttribute.cs
- LockCookie.cs
- HybridDictionary.cs
- RSAOAEPKeyExchangeDeformatter.cs
- ObjectStateManagerMetadata.cs
- CodeIdentifier.cs