Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Cryptography / RC2CryptoServiceProvider.cs / 1305376 / RC2CryptoServiceProvider.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // RC2CryptoServiceProvider.cs // namespace System.Security.Cryptography { using System.Globalization; using System.Diagnostics.Contracts; [System.Runtime.InteropServices.ComVisible(true)] public sealed class RC2CryptoServiceProvider : RC2 { private bool m_use40bitSalt = false; private static KeySizes[] s_legalKeySizes = { new KeySizes(40, 128, 8) // cryptoAPI implementation only goes up to 128 }; // // public constructors // [System.Security.SecuritySafeCritical] // auto-generated public RC2CryptoServiceProvider () { if (CryptoConfig.AllowOnlyFipsAlgorithms) throw new InvalidOperationException(Environment.GetResourceString("Cryptography_NonCompliantFIPSAlgorithm")); Contract.EndContractBlock(); if (!Utils.HasAlgorithm(Constants.CALG_RC2, 0)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_AlgorithmNotAvailable")); // Acquire a Type 1 provider. This will be the Enhanced provider if available, otherwise // it will be the base provider. LegalKeySizesValue = s_legalKeySizes; // Since the CSP only supports a CFB feedback of 8, make that the default FeedbackSizeValue = 8; } // // public methods // public override int EffectiveKeySize { get { return KeySizeValue; } set { if (value != KeySizeValue) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_RC2_EKSKS2")); } } [System.Runtime.InteropServices.ComVisible(false)] public bool UseSalt { get { return m_use40bitSalt; } set { m_use40bitSalt = value; } } [System.Security.SecuritySafeCritical] // auto-generated public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV) { return _NewEncryptor(rgbKey, ModeValue, rgbIV, EffectiveKeySizeValue, FeedbackSizeValue, CryptoAPITransformMode.Encrypt); } [System.Security.SecuritySafeCritical] // auto-generated public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV) { return _NewEncryptor(rgbKey, ModeValue, rgbIV, EffectiveKeySizeValue, FeedbackSizeValue, CryptoAPITransformMode.Decrypt); } public override void GenerateKey () { KeyValue = new byte[KeySizeValue/8]; Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); } public override void GenerateIV () { // block size is always 64 bits so IV is always 64 bits == 8 bytes IVValue = new byte[8]; Utils.StaticRandomNumberGenerator.GetBytes(IVValue); } // // private methods // [System.Security.SecurityCritical] // auto-generated private ICryptoTransform _NewEncryptor (byte[] rgbKey, CipherMode mode, byte[] rgbIV, int effectiveKeySize, 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 RC2_CSP 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")); if (rgbKey == null) { rgbKey = new byte[KeySizeValue/8]; Utils.StaticRandomNumberGenerator.GetBytes(rgbKey); } // Check the rgbKey size int keySizeValue = rgbKey.Length * 8; if (!ValidKeySize(keySizeValue)) throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeySize")); // Deal with effective key length questions rgArgIds[cArgs] = Constants.KP_EFFECTIVE_KEYLEN; if (EffectiveKeySizeValue == 0) { rgArgValues[cArgs] = keySizeValue; } else { rgArgValues[cArgs] = effectiveKeySize; } cArgs += 1; // 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; } if (!Utils.HasAlgorithm(Constants.CALG_RC2, keySizeValue)) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_AlgKeySizeNotAvailable", keySizeValue)); // Create the encryptor/decryptor object return new CryptoAPITransform(Constants.CALG_RC2, cArgs, rgArgIds, rgArgValues, rgbKey, PaddingValue, mode, BlockSizeValue, feedbackSize, m_use40bitSalt, 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
- WindowsFormsLinkLabel.cs
- DataStorage.cs
- ComponentResourceManager.cs
- SqlDataSourceFilteringEventArgs.cs
- DataGridViewColumnDesignTimeVisibleAttribute.cs
- SafePointer.cs
- WebPartDisplayModeEventArgs.cs
- CFStream.cs
- ExceptionCollection.cs
- CompatibleIComparer.cs
- GenericWebPart.cs
- ListViewCancelEventArgs.cs
- BamlTreeNode.cs
- List.cs
- HwndMouseInputProvider.cs
- TraceContextRecord.cs
- AutomationFocusChangedEventArgs.cs
- MachineKeySection.cs
- SmtpClient.cs
- COSERVERINFO.cs
- TextTreeObjectNode.cs
- WindowsListViewGroupHelper.cs
- ContentElementCollection.cs
- VersionedStreamOwner.cs
- Descriptor.cs
- CommonDialog.cs
- ObjectToModelValueConverter.cs
- DataReceivedEventArgs.cs
- ResourcePart.cs
- CssClassPropertyAttribute.cs
- AudioSignalProblemOccurredEventArgs.cs
- MetaTableHelper.cs
- Stack.cs
- BaseTemplateBuildProvider.cs
- CodeParameterDeclarationExpressionCollection.cs
- BamlLocalizer.cs
- CaseExpr.cs
- ContentDisposition.cs
- xmlfixedPageInfo.cs
- ShaderEffect.cs
- DbParameterCollectionHelper.cs
- SQLMoney.cs
- HostedImpersonationContext.cs
- _SSPISessionCache.cs
- UnsafeNativeMethods.cs
- DataSourceSelectArguments.cs
- RoutingUtilities.cs
- LayoutInformation.cs
- BlockCollection.cs
- Activity.cs
- Triplet.cs
- DateTimeSerializationSection.cs
- HtmlTableRowCollection.cs
- DataGrid.cs
- ExternalDataExchangeService.cs
- JsonUriDataContract.cs
- InfoCardRSAPKCS1SignatureDeformatter.cs
- RegionInfo.cs
- ResourceDisplayNameAttribute.cs
- OdbcReferenceCollection.cs
- FillBehavior.cs
- DataTableTypeConverter.cs
- XmlAnyElementAttributes.cs
- UserInitiatedNavigationPermission.cs
- CharacterString.cs
- WriterOutput.cs
- ProjectionNode.cs
- AutomationPattern.cs
- IntegerCollectionEditor.cs
- InputBinding.cs
- TypeToken.cs
- MulticastNotSupportedException.cs
- RawStylusInputCustomData.cs
- ResourceSet.cs
- DebugView.cs
- WindowsSolidBrush.cs
- TrackingParameters.cs
- ListenerElementsCollection.cs
- FontInfo.cs
- SourceSwitch.cs
- AssemblyResolver.cs
- Light.cs
- TextTreeUndoUnit.cs
- MetadataItem_Static.cs
- WrappedIUnknown.cs
- XmlDeclaration.cs
- Propagator.JoinPropagator.JoinPredicateVisitor.cs
- Socket.cs
- DebuggerAttributes.cs
- ReflectionTypeLoadException.cs
- EntityModelSchemaGenerator.cs
- ConnectorRouter.cs
- COAUTHIDENTITY.cs
- SQLSingle.cs
- PostBackTrigger.cs
- shaperfactoryquerycachekey.cs
- DataGridViewRowCancelEventArgs.cs
- AndCondition.cs
- _ListenerAsyncResult.cs
- DesignerMetadata.cs