Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / clr / src / BCL / System / Security / Cryptography / TripleDESCryptoServiceProvider.cs / 1 / TripleDESCryptoServiceProvider.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // TripleDESCryptoServiceProvider.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public sealed class TripleDESCryptoServiceProvider : TripleDES { // // public constructors // public TripleDESCryptoServiceProvider () { if (!Utils.HasAlgorithm(Constants.CALG_3DES, 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"),"TripleDES"); 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"),"TripleDES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Decrypt); } public override void GenerateKey () { KeyValue = new byte[KeySizeValue/8]; Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); // Never hand back a weak or semi-weak key while (TripleDES.IsWeakKey(KeyValue)) { Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); } } public override void GenerateIV () { // IV is always 8 bytes/64 bits because block size is always 64 bits 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]; int algid = Constants.CALG_3DES; // Check for bad values // 1) we don't support OFB mode in TripleDESCryptoServiceProvider 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[KeySizeValue/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; } // If the size of rgbKey is 16 bytes, then we're doing two-key 3DES, so switch algids // Note that we assume that if a CSP supports CALG_3DES then it also supports CALG_3DES_112 if (rgbKey.Length == 16) { algid = Constants.CALG_3DES_112; } // Create the encryptor object return new CryptoAPITransform(algid, 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. // // ==--== // // TripleDESCryptoServiceProvider.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public sealed class TripleDESCryptoServiceProvider : TripleDES { // // public constructors // public TripleDESCryptoServiceProvider () { if (!Utils.HasAlgorithm(Constants.CALG_3DES, 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"),"TripleDES"); 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"),"TripleDES"); return _NewEncryptor(rgbKey, ModeValue, rgbIV, FeedbackSizeValue, CryptoAPITransformMode.Decrypt); } public override void GenerateKey () { KeyValue = new byte[KeySizeValue/8]; Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); // Never hand back a weak or semi-weak key while (TripleDES.IsWeakKey(KeyValue)) { Utils.StaticRandomNumberGenerator.GetBytes(KeyValue); } } public override void GenerateIV () { // IV is always 8 bytes/64 bits because block size is always 64 bits 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]; int algid = Constants.CALG_3DES; // Check for bad values // 1) we don't support OFB mode in TripleDESCryptoServiceProvider 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[KeySizeValue/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; } // If the size of rgbKey is 16 bytes, then we're doing two-key 3DES, so switch algids // Note that we assume that if a CSP supports CALG_3DES then it also supports CALG_3DES_112 if (rgbKey.Length == 16) { algid = Constants.CALG_3DES_112; } // Create the encryptor object return new CryptoAPITransform(algid, 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
- TemplateKeyConverter.cs
- coordinatorfactory.cs
- OutputCacheModule.cs
- CompositionAdorner.cs
- SafeLocalMemHandle.cs
- StreamWriter.cs
- AsyncOperation.cs
- IntSecurity.cs
- TextLineResult.cs
- WpfGeneratedKnownProperties.cs
- TdsRecordBufferSetter.cs
- ViewValidator.cs
- EventLogPermissionEntry.cs
- HelloOperation11AsyncResult.cs
- MetadataItemEmitter.cs
- IncrementalReadDecoders.cs
- Metafile.cs
- HttpListenerContext.cs
- NamespaceImport.cs
- IpcServerChannel.cs
- HttpConfigurationSystem.cs
- MsmqTransportReceiveParameters.cs
- WebConfigurationHost.cs
- ComponentManagerBroker.cs
- ListViewSelectEventArgs.cs
- Panel.cs
- DataSetUtil.cs
- Nullable.cs
- ValidationError.cs
- DataGridColumn.cs
- DataGridViewControlCollection.cs
- WindowsListViewGroupHelper.cs
- MatrixTransform3D.cs
- SqlBooleanizer.cs
- FastEncoderStatics.cs
- FontDriver.cs
- PeerApplicationLaunchInfo.cs
- PerformanceCounterManager.cs
- AutomationIdentifier.cs
- ProfessionalColorTable.cs
- unitconverter.cs
- entityreference_tresulttype.cs
- TreeNodeCollection.cs
- InternalCache.cs
- DataGridPreparingCellForEditEventArgs.cs
- TransformGroup.cs
- DataTemplateKey.cs
- TypeElementCollection.cs
- DbParameterCollection.cs
- Workspace.cs
- NavigationPropertySingletonExpression.cs
- DerivedKeySecurityTokenStub.cs
- TableStyle.cs
- SdlChannelSink.cs
- EntityDataSourceMemberPath.cs
- RayMeshGeometry3DHitTestResult.cs
- Module.cs
- ReflectionHelper.cs
- HeaderedItemsControl.cs
- Inflater.cs
- ListControlBuilder.cs
- ChannelPoolSettings.cs
- ByteAnimation.cs
- DateTimeConverter2.cs
- Tokenizer.cs
- CodeDelegateInvokeExpression.cs
- DecodeHelper.cs
- WebServiceEnumData.cs
- TreeNodeSelectionProcessor.cs
- cookiecontainer.cs
- ChildDocumentBlock.cs
- XmlAutoDetectWriter.cs
- TextTreePropertyUndoUnit.cs
- FixedSOMTableCell.cs
- Conditional.cs
- BaseCAMarshaler.cs
- Missing.cs
- VariableReference.cs
- Message.cs
- QilName.cs
- _AutoWebProxyScriptHelper.cs
- XmlSortKey.cs
- ActivityCodeDomReferenceService.cs
- GridViewColumn.cs
- ObjectDataSourceMethodEventArgs.cs
- DescriptionAttribute.cs
- CommentAction.cs
- DynamicActionMessageFilter.cs
- EnumerableCollectionView.cs
- Dump.cs
- AppliedDeviceFiltersDialog.cs
- SchemaHelper.cs
- EventSinkActivityDesigner.cs
- BuildProvider.cs
- SendKeys.cs
- PageBuildProvider.cs
- __ComObject.cs
- WebPartExportVerb.cs
- BCLDebug.cs
- DataGridViewAccessibleObject.cs