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
- OrderedDictionary.cs
- nulltextcontainer.cs
- Message.cs
- EarlyBoundInfo.cs
- SqlInternalConnectionSmi.cs
- documentsequencetextview.cs
- WebDescriptionAttribute.cs
- WebExceptionStatus.cs
- DataGridViewCellMouseEventArgs.cs
- SoapDocumentMethodAttribute.cs
- CallTemplateAction.cs
- ConnectionConsumerAttribute.cs
- MemberInfoSerializationHolder.cs
- XmlLanguageConverter.cs
- TypedDataSetSchemaImporterExtensionFx35.cs
- OleDbConnectionPoolGroupProviderInfo.cs
- ColorBlend.cs
- WindowsImpersonationContext.cs
- WebColorConverter.cs
- BasicCellRelation.cs
- ImageField.cs
- UIElementParagraph.cs
- OdbcErrorCollection.cs
- WebEncodingValidator.cs
- SerialReceived.cs
- MessageHeaderException.cs
- SymLanguageVendor.cs
- SerialPort.cs
- FastEncoderWindow.cs
- LocalizationParserHooks.cs
- TraceHandler.cs
- TypographyProperties.cs
- WebPartMovingEventArgs.cs
- _NegotiateClient.cs
- TreeViewItem.cs
- ComplexPropertyEntry.cs
- SafeNativeMethods.cs
- SoapExtensionReflector.cs
- FileEnumerator.cs
- TrackingStringDictionary.cs
- LongValidatorAttribute.cs
- ObjectManager.cs
- SqlNodeAnnotation.cs
- HtmlInputPassword.cs
- DeferrableContentConverter.cs
- Path.cs
- NullToBooleanConverter.cs
- BulletedList.cs
- PrintDocument.cs
- TextEditorMouse.cs
- C14NUtil.cs
- GridView.cs
- InstalledVoice.cs
- BindingsSection.cs
- mansign.cs
- BitmapData.cs
- CatalogZoneAutoFormat.cs
- SecurityRuntime.cs
- SecurityCapabilities.cs
- DefaultBinder.cs
- IgnorePropertiesAttribute.cs
- WebPartCollection.cs
- GlobalizationSection.cs
- PropertyGridCommands.cs
- GroupStyle.cs
- XmlSchemaExternal.cs
- TraceShell.cs
- UrlMappingsSection.cs
- ToolStripScrollButton.cs
- SubpageParagraph.cs
- PointLight.cs
- ReferenceTypeElement.cs
- RectAnimation.cs
- FileAuthorizationModule.cs
- WorkBatch.cs
- ItemCollection.cs
- TextDpi.cs
- EditorPartChrome.cs
- EndpointInfo.cs
- AddValidationError.cs
- httpstaticobjectscollection.cs
- PolicyException.cs
- PermissionListSet.cs
- X509Certificate2Collection.cs
- PageThemeBuildProvider.cs
- ButtonFieldBase.cs
- DeviceContext2.cs
- XmlSchemaSequence.cs
- PopupRoot.cs
- Point3D.cs
- AnonymousIdentificationModule.cs
- Matrix.cs
- ResourceContainer.cs
- HostedTcpTransportManager.cs
- DataSvcMapFileSerializer.cs
- CharStorage.cs
- XPathAncestorQuery.cs
- BaseParaClient.cs
- Metafile.cs
- SpeechAudioFormatInfo.cs