Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / 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
- Parser.cs
- BamlRecordReader.cs
- KeyValueConfigurationElement.cs
- LocatorPart.cs
- SynchronizationScope.cs
- ExpressionConverter.cs
- XsltOutput.cs
- NetStream.cs
- TextWriterTraceListener.cs
- figurelengthconverter.cs
- LabelEditEvent.cs
- TargetConverter.cs
- FileAuthorizationModule.cs
- CSharpCodeProvider.cs
- TraceSection.cs
- PathStreamGeometryContext.cs
- BuildManagerHost.cs
- XNodeNavigator.cs
- LOSFormatter.cs
- EventHandlersStore.cs
- OleDbRowUpdatedEvent.cs
- XamlWrappingReader.cs
- FormViewDeleteEventArgs.cs
- SessionState.cs
- ThrowHelper.cs
- securitycriticaldata.cs
- StrongNameUtility.cs
- Int16Animation.cs
- EmissiveMaterial.cs
- Command.cs
- ListenerSessionConnectionReader.cs
- MultiAsyncResult.cs
- CopyAction.cs
- BitmapEditor.cs
- ActivityDesigner.cs
- SqlConnectionString.cs
- dtdvalidator.cs
- PrintDialog.cs
- ConfigXmlElement.cs
- ShaperBuffers.cs
- OperatingSystemVersionCheck.cs
- FormParameter.cs
- TextWriter.cs
- documentsequencetextcontainer.cs
- DrawingContextWalker.cs
- ResourceManager.cs
- XmlILAnnotation.cs
- MouseDevice.cs
- MdiWindowListItemConverter.cs
- TranslateTransform.cs
- XmlIterators.cs
- StyleSheetRefUrlEditor.cs
- StaticSiteMapProvider.cs
- TimeStampChecker.cs
- WebEventTraceProvider.cs
- WmpBitmapDecoder.cs
- WeakReferenceList.cs
- OleDbMetaDataFactory.cs
- SqlGatherConsumedAliases.cs
- FrameworkElement.cs
- HtmlLink.cs
- DBSchemaRow.cs
- WebPermission.cs
- CodeParameterDeclarationExpressionCollection.cs
- ZipIOExtraField.cs
- RawStylusActions.cs
- WindowsTreeView.cs
- IntegerCollectionEditor.cs
- AutomationPropertyInfo.cs
- TailCallAnalyzer.cs
- QfeChecker.cs
- EasingQuaternionKeyFrame.cs
- _HTTPDateParse.cs
- Propagator.JoinPropagator.cs
- MatrixTransform.cs
- TraceLevelStore.cs
- XPathChildIterator.cs
- FormatSettings.cs
- SessionStateItemCollection.cs
- NetPipeSection.cs
- AssemblyName.cs
- WebBrowser.cs
- DetailsViewInsertEventArgs.cs
- ViewSimplifier.cs
- GACMembershipCondition.cs
- LineBreak.cs
- ListControlConvertEventArgs.cs
- HideDisabledControlAdapter.cs
- NullableLongMinMaxAggregationOperator.cs
- PersonalizationState.cs
- SingleAnimationBase.cs
- MsmqProcessProtocolHandler.cs
- FileEnumerator.cs
- XmlByteStreamWriter.cs
- WebHttpBindingCollectionElement.cs
- BlurEffect.cs
- Mapping.cs
- listitem.cs
- StorageFunctionMapping.cs
- DataGridRowDetailsEventArgs.cs