Code:
/ 4.0 / 4.0 / 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. // ==++== // // 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
- CounterSetInstanceCounterDataSet.cs
- GcSettings.cs
- DependencyPropertyValueSerializer.cs
- SqlCrossApplyToCrossJoin.cs
- FormsAuthentication.cs
- DocumentOrderComparer.cs
- HtmlGenericControl.cs
- PrinterUnitConvert.cs
- SignatureHelper.cs
- EntityParameter.cs
- LinkUtilities.cs
- MarshalByRefObject.cs
- XmlUtilWriter.cs
- SqlDeflator.cs
- SchemaImporter.cs
- WindowsEditBoxRange.cs
- TemplateControlBuildProvider.cs
- AddInAttribute.cs
- InternalResources.cs
- FullTextState.cs
- Throw.cs
- RotateTransform3D.cs
- TableLayoutRowStyleCollection.cs
- PackageDigitalSignature.cs
- Msec.cs
- FlowLayout.cs
- DynamicResourceExtension.cs
- MaterialCollection.cs
- TextPointer.cs
- DependencySource.cs
- CookielessHelper.cs
- ListViewInsertEventArgs.cs
- DropSource.cs
- SiteIdentityPermission.cs
- ControlBindingsConverter.cs
- HostProtectionPermission.cs
- EncodingNLS.cs
- StructuralType.cs
- ToolStripControlHost.cs
- IncrementalReadDecoders.cs
- XmlSerializer.cs
- XmlParserContext.cs
- FormsAuthenticationEventArgs.cs
- ProfileEventArgs.cs
- DataRelation.cs
- OleDbParameterCollection.cs
- MessageQueueCriteria.cs
- Viewport2DVisual3D.cs
- DataTableNameHandler.cs
- GCHandleCookieTable.cs
- ServiceMetadataPublishingElement.cs
- CodeFieldReferenceExpression.cs
- AttachedPropertyBrowsableAttribute.cs
- TcpChannelListener.cs
- EntityCommandDefinition.cs
- KeyBinding.cs
- Converter.cs
- TextModifierScope.cs
- HttpRuntimeSection.cs
- ComponentEditorPage.cs
- SecurityManager.cs
- WindowsProgressbar.cs
- IChannel.cs
- AttachedPropertyBrowsableForTypeAttribute.cs
- KeyFrames.cs
- CustomErrorsSection.cs
- ProxyHwnd.cs
- WindowsFormsLinkLabel.cs
- QilExpression.cs
- TemplateParser.cs
- ByeMessageApril2005.cs
- Exceptions.cs
- CurrentChangingEventArgs.cs
- DataViewSetting.cs
- WebServiceData.cs
- SelectionProviderWrapper.cs
- MetadataArtifactLoaderCompositeFile.cs
- XPathArrayIterator.cs
- FieldAccessException.cs
- RangeBase.cs
- XsltException.cs
- EdmToObjectNamespaceMap.cs
- SafeFileMapViewHandle.cs
- SmtpReplyReaderFactory.cs
- SemanticAnalyzer.cs
- ManagedFilter.cs
- XmlHierarchicalDataSourceView.cs
- MobileSysDescriptionAttribute.cs
- DataGridTextBoxColumn.cs
- XmlValidatingReader.cs
- SecurityPermission.cs
- ActivationWorker.cs
- ResourceReferenceExpressionConverter.cs
- UriExt.cs
- Scene3D.cs
- SafeFileMappingHandle.cs
- ListBoxItem.cs
- Int32AnimationBase.cs
- LookupNode.cs
- XmlExpressionDumper.cs