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 / 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
- ProfileProvider.cs
- MasterPage.cs
- ThreadInterruptedException.cs
- LinearGradientBrush.cs
- HttpPostProtocolReflector.cs
- BinaryMethodMessage.cs
- AssemblyInfo.cs
- TableStyle.cs
- SpeakInfo.cs
- SessionStateUtil.cs
- DecoderNLS.cs
- HyperLinkColumn.cs
- WeakHashtable.cs
- TcpClientCredentialType.cs
- SourceFilter.cs
- ISAPIWorkerRequest.cs
- DataGridViewColumnDividerDoubleClickEventArgs.cs
- KeyValuePairs.cs
- XmlDownloadManager.cs
- ArgIterator.cs
- SqlServer2KCompatibilityAnnotation.cs
- AdministrationHelpers.cs
- Message.cs
- StyleBamlRecordReader.cs
- StandardToolWindows.cs
- SingleKeyFrameCollection.cs
- ToolStripContentPanelRenderEventArgs.cs
- Marshal.cs
- HttpListener.cs
- CodeCatchClauseCollection.cs
- X509CertificateStore.cs
- ColorConverter.cs
- SrgsRuleRef.cs
- StateElement.cs
- DataGridViewCellValidatingEventArgs.cs
- TextDecoration.cs
- HtmlElement.cs
- XamlRtfConverter.cs
- FormatVersion.cs
- PasswordRecovery.cs
- IFlowDocumentViewer.cs
- PerfCounters.cs
- ImmComposition.cs
- DocumentViewer.cs
- StrokeCollectionConverter.cs
- InvalidCastException.cs
- ContentValidator.cs
- SecurityElement.cs
- TransformedBitmap.cs
- MdiWindowListStrip.cs
- OleCmdHelper.cs
- IdentitySection.cs
- DataGridViewRowDividerDoubleClickEventArgs.cs
- ScriptControl.cs
- TdsParameterSetter.cs
- TemplateManager.cs
- Expander.cs
- TripleDES.cs
- CreateUserErrorEventArgs.cs
- FrameSecurityDescriptor.cs
- AstTree.cs
- FontDifferentiator.cs
- ImageMetadata.cs
- DataGridViewCell.cs
- UrlMapping.cs
- SudsWriter.cs
- CodeVariableDeclarationStatement.cs
- AspNetHostingPermission.cs
- HotCommands.cs
- DataGridTableCollection.cs
- TextEditor.cs
- securitycriticaldataClass.cs
- NetworkInterface.cs
- Int32Animation.cs
- DbParameterHelper.cs
- BStrWrapper.cs
- CompoundFileStreamReference.cs
- LocalizeDesigner.cs
- ScriptServiceAttribute.cs
- ResourceDefaultValueAttribute.cs
- InternalDispatchObject.cs
- Win32Native.cs
- X509CertificateValidationMode.cs
- DataExpression.cs
- TableCellCollection.cs
- ChannelOptions.cs
- OledbConnectionStringbuilder.cs
- _SingleItemRequestCache.cs
- NativeMethods.cs
- cookieexception.cs
- XPathItem.cs
- RectAnimationUsingKeyFrames.cs
- DbLambda.cs
- XmlRawWriter.cs
- UnsafeNativeMethodsPenimc.cs
- Selection.cs
- DataViewListener.cs
- BinaryMethodMessage.cs
- ToolboxCategory.cs
- EpmSyndicationContentDeSerializer.cs