Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / Cryptography / base64Transforms.cs / 1 / base64Transforms.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // Base64Transform.cs // // This file contains two ICryptoTransforms: ToBase64Transform and FromBase64Transform // they may be attached to a CryptoStream in either read or write mode namespace System.Security.Cryptography { using System; using System.IO; using System.Text; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum FromBase64TransformMode { IgnoreWhiteSpaces = 0, DoNotIgnoreWhiteSpaces = 1, } [System.Runtime.InteropServices.ComVisible(true)] public class ToBase64Transform : ICryptoTransform { private ASCIIEncoding asciiEncoding = new ASCIIEncoding(); // converting to Base64 takes 3 bytes input and generates 4 bytes output public int InputBlockSize { get { return(3); } } public int OutputBlockSize { get { return(4); } } public bool CanTransformMultipleBlocks { get { return(false); } } public virtual bool CanReuseTransform { get { return(true); } } public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset) { if (asciiEncoding == null) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // Do some validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); // for now, only convert 3 bytes to 4 char[] temp = new char[4]; Convert.ToBase64CharArray(inputBuffer, inputOffset, 3, temp, 0); byte[] tempBytes = asciiEncoding.GetBytes(temp); if (tempBytes.Length != 4) throw new CryptographicException(Environment.GetResourceString( "Cryptography_SSE_InvalidDataSize" )); Buffer.BlockCopy(tempBytes, 0, outputBuffer, outputOffset, tempBytes.Length); return(tempBytes.Length); } public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount) { if (asciiEncoding == null) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); // Do some validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); // Convert.ToBase64CharArray already does padding, so all we have to // again, for now only a block at a time if (inputCount == 0) { return(new byte[0]); } else { char[] temp = new char[4]; Convert.ToBase64CharArray(inputBuffer, inputOffset, inputCount, temp, 0); byte[] tempBytes = asciiEncoding.GetBytes(temp); return(tempBytes); } } // must implement IDisposable, but in this case there's nothing to do. ///void IDisposable.Dispose() { Dispose(true); GC.SuppressFinalize(this); } public void Clear() { ((IDisposable) this).Dispose(); } protected virtual void Dispose(bool disposing) { if (disposing) { asciiEncoding = null; } } ~ToBase64Transform() { Dispose(false); } } [System.Runtime.InteropServices.ComVisible(true)] public class FromBase64Transform : ICryptoTransform { private byte[] _inputBuffer = new byte[4]; private int _inputIndex; private FromBase64TransformMode _whitespaces; // Constructors public FromBase64Transform() : this(FromBase64TransformMode.IgnoreWhiteSpaces) {} public FromBase64Transform(FromBase64TransformMode whitespaces) { _whitespaces = whitespaces; _inputIndex = 0; } // converting from Base64 generates 3 bytes output from each 4 bytes input block public int InputBlockSize { get { return(1); } } public int OutputBlockSize { get { return(3); } } public bool CanTransformMultipleBlocks { get { return(false); } } public virtual bool CanReuseTransform { get { return(true); } } public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset) { byte[] temp = new byte[inputCount]; char[] tempChar; int effectiveCount; // Do some validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (_inputBuffer == null) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); if (_whitespaces == FromBase64TransformMode.IgnoreWhiteSpaces) { temp = DiscardWhiteSpaces(inputBuffer, inputOffset, inputCount); effectiveCount = temp.Length; } else { Buffer.InternalBlockCopy(inputBuffer, inputOffset, temp, 0, inputCount); effectiveCount = inputCount; } if (effectiveCount + _inputIndex < 4) { Buffer.InternalBlockCopy(temp, 0, _inputBuffer, _inputIndex, effectiveCount); _inputIndex += effectiveCount; return 0; } // Get the number of 4 bytes blocks to transform int numBlocks = (effectiveCount + _inputIndex) / 4; byte[] transformBuffer = new byte[_inputIndex + effectiveCount]; Buffer.InternalBlockCopy(_inputBuffer, 0, transformBuffer, 0, _inputIndex); Buffer.InternalBlockCopy(temp, 0, transformBuffer, _inputIndex, effectiveCount); _inputIndex = (effectiveCount + _inputIndex) % 4; Buffer.InternalBlockCopy(temp, effectiveCount - _inputIndex, _inputBuffer, 0, _inputIndex); tempChar = Encoding.ASCII.GetChars(transformBuffer, 0, 4*numBlocks); byte[] tempBytes = Convert.FromBase64CharArray(tempChar, 0, 4*numBlocks); Buffer.BlockCopy(tempBytes, 0, outputBuffer, outputOffset, tempBytes.Length); return(tempBytes.Length); } public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount) { byte[] temp = new byte[inputCount]; char[] tempChar; int effectiveCount; // Do some validation if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (inputCount < 0 || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (_inputBuffer == null) throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_Generic")); if (_whitespaces == FromBase64TransformMode.IgnoreWhiteSpaces) { temp = DiscardWhiteSpaces(inputBuffer, inputOffset, inputCount); effectiveCount = temp.Length; } else { Buffer.InternalBlockCopy(inputBuffer, inputOffset, temp, 0, inputCount); effectiveCount = inputCount; } if (effectiveCount + _inputIndex < 4) { Reset(); return (new byte[0]); } // Get the number of 4 bytes blocks to transform int numBlocks = (effectiveCount + _inputIndex) / 4; byte[] transformBuffer = new byte[_inputIndex + effectiveCount]; Buffer.InternalBlockCopy(_inputBuffer, 0, transformBuffer, 0, _inputIndex); Buffer.InternalBlockCopy(temp, 0, transformBuffer, _inputIndex, effectiveCount); _inputIndex = (effectiveCount + _inputIndex) % 4; Buffer.InternalBlockCopy(temp, effectiveCount - _inputIndex, _inputBuffer, 0, _inputIndex); tempChar = Encoding.ASCII.GetChars(transformBuffer, 0, 4*numBlocks); byte[] tempBytes = Convert.FromBase64CharArray(tempChar, 0, 4*numBlocks); // reinitialize the transform Reset(); return(tempBytes); } private byte[] DiscardWhiteSpaces(byte[] inputBuffer, int inputOffset, int inputCount) { int i, iCount = 0; for (i=0; i void IDisposable.Dispose() { Dispose(true); GC.SuppressFinalize(this); } // Reset the state of the transform so it can be used again private void Reset() { _inputIndex = 0; } public void Clear() { ((IDisposable) this).Dispose(); } protected virtual void Dispose(bool disposing) { // we always want to clear the input buffer if (disposing) { if (_inputBuffer != null) Array.Clear(_inputBuffer, 0, _inputBuffer.Length); _inputBuffer = null; _inputIndex = 0; } } ~FromBase64Transform() { Dispose(false); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- MarkupProperty.cs
- XamlFigureLengthSerializer.cs
- InputLanguage.cs
- TimeoutValidationAttribute.cs
- SafeNativeMethods.cs
- SpotLight.cs
- ObjectDataSourceFilteringEventArgs.cs
- EntityCommandCompilationException.cs
- FilteredDataSetHelper.cs
- StaticSiteMapProvider.cs
- ConfigurationElementProperty.cs
- VectorAnimationBase.cs
- BadImageFormatException.cs
- DrawingServices.cs
- Pair.cs
- PriorityItem.cs
- PriorityBindingExpression.cs
- FullTrustAssembliesSection.cs
- ElementHostPropertyMap.cs
- CellNormalizer.cs
- TimeoutException.cs
- CompilationLock.cs
- XNodeValidator.cs
- LedgerEntryCollection.cs
- AttachedPropertyBrowsableForTypeAttribute.cs
- PasswordDeriveBytes.cs
- FormViewPagerRow.cs
- shaperfactoryquerycachekey.cs
- DateTimeParse.cs
- BooleanToSelectiveScrollingOrientationConverter.cs
- EdmFunctionAttribute.cs
- GACIdentityPermission.cs
- PathStreamGeometryContext.cs
- CheckBoxList.cs
- SafeHandle.cs
- VersionPair.cs
- ClientConfigurationSystem.cs
- BoolExpressionVisitors.cs
- TextRange.cs
- DrawingGroup.cs
- CollectionsUtil.cs
- DrawingDrawingContext.cs
- BindingContext.cs
- PropertyValueChangedEvent.cs
- Speller.cs
- InputLanguageCollection.cs
- xdrvalidator.cs
- IPEndPoint.cs
- AstNode.cs
- DeferrableContentConverter.cs
- MultiViewDesigner.cs
- ObjectList.cs
- CodeSubDirectoriesCollection.cs
- Stacktrace.cs
- PropagatorResult.cs
- DoubleAnimationClockResource.cs
- DataGridColumnHeaderItemAutomationPeer.cs
- RegexInterpreter.cs
- XmlSchemaAnnotation.cs
- ProfileService.cs
- LocatorPart.cs
- LiteralControl.cs
- StandardToolWindows.cs
- ThousandthOfEmRealDoubles.cs
- isolationinterop.cs
- UnsafeCollabNativeMethods.cs
- QueryStringParameter.cs
- Error.cs
- DataBindingExpressionBuilder.cs
- PerformanceCounterManager.cs
- SecurityState.cs
- CellLabel.cs
- MDIControlStrip.cs
- InfocardInteractiveChannelInitializer.cs
- BitmapEncoder.cs
- SessionStateItemCollection.cs
- FacetValues.cs
- ComplexObject.cs
- ProxyWebPartConnectionCollection.cs
- DependencyObjectType.cs
- UnmanagedBitmapWrapper.cs
- WebOperationContext.cs
- ParserOptions.cs
- PropertyPath.cs
- ContextInformation.cs
- TextDecorationCollection.cs
- ListViewSelectEventArgs.cs
- UnauthorizedAccessException.cs
- _HeaderInfoTable.cs
- RemoveStoryboard.cs
- DataListItemCollection.cs
- TreeNodeStyleCollection.cs
- UnsafeNativeMethods.cs
- ACE.cs
- DefaultProxySection.cs
- FontCollection.cs
- HostingEnvironment.cs
- ButtonColumn.cs
- loginstatus.cs
- TransformedBitmap.cs