Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / 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 check is that // the inputCount wasn't 0 // 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); } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SystemNetHelpers.cs
- XomlCompiler.cs
- PropertyInfoSet.cs
- FontInfo.cs
- ListenerElementsCollection.cs
- XmlUrlResolver.cs
- XMLSchema.cs
- PackageRelationshipCollection.cs
- ExpressionWriter.cs
- ServerIdentity.cs
- XmlDictionaryString.cs
- SamlAuthorityBinding.cs
- AutomationPeer.cs
- PointAnimationClockResource.cs
- hresults.cs
- StructureChangedEventArgs.cs
- DataServiceQuery.cs
- WeakEventManager.cs
- TripleDESCryptoServiceProvider.cs
- MissingFieldException.cs
- SapiRecoContext.cs
- relpropertyhelper.cs
- MenuItemStyleCollection.cs
- XmlSerializerAssemblyAttribute.cs
- TextDecoration.cs
- DataControlFieldHeaderCell.cs
- MethodBuilderInstantiation.cs
- DelegatingMessage.cs
- DispatcherProcessingDisabled.cs
- TextEvent.cs
- PackageProperties.cs
- IPHostEntry.cs
- RoleBoolean.cs
- NamespaceEmitter.cs
- ColumnPropertiesGroup.cs
- VisualStyleRenderer.cs
- ChtmlTextWriter.cs
- DateTimeParse.cs
- RijndaelManagedTransform.cs
- InternalConfigHost.cs
- DataGridViewUtilities.cs
- SizeChangedInfo.cs
- KnownTypesHelper.cs
- PointConverter.cs
- ObjectStateEntry.cs
- Assembly.cs
- InputReferenceExpression.cs
- CursorConverter.cs
- Page.cs
- infer.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- ActivityPreviewDesigner.cs
- LogExtentCollection.cs
- QilFunction.cs
- ChangeDirector.cs
- NameTable.cs
- BinaryCommonClasses.cs
- CustomTypeDescriptor.cs
- UInt64.cs
- DefaultValueMapping.cs
- ToolStripDesignerAvailabilityAttribute.cs
- CodeCompileUnit.cs
- DataGridCell.cs
- SubstitutionList.cs
- EntityDataSourceValidationException.cs
- Set.cs
- CodeObject.cs
- Encoder.cs
- XmlWriterSettings.cs
- WSFederationHttpSecurity.cs
- ImmutablePropertyDescriptorGridEntry.cs
- ShutDownListener.cs
- PersistChildrenAttribute.cs
- XPathNavigatorKeyComparer.cs
- OleDbTransaction.cs
- SmiEventSink.cs
- RelatedView.cs
- FacetChecker.cs
- EditorAttributeInfo.cs
- DnsPermission.cs
- UrlMapping.cs
- SocketElement.cs
- BrowserDefinitionCollection.cs
- BroadcastEventHelper.cs
- FilteredXmlReader.cs
- SourceCollection.cs
- HttpModuleAction.cs
- TraceLog.cs
- Listbox.cs
- DetailsViewAutoFormat.cs
- FrameAutomationPeer.cs
- CodeGenerator.cs
- RequestCachePolicyConverter.cs
- HttpCacheVaryByContentEncodings.cs
- TemplatePropertyEntry.cs
- DBCSCodePageEncoding.cs
- HostUtils.cs
- ApplicationId.cs
- RegexNode.cs
- ServiceChannel.cs