ExclusiveCanonicalizationTransform.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / ExclusiveCanonicalizationTransform.cs / 1305376 / ExclusiveCanonicalizationTransform.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IdentityModel 
{
    using System.IO; 
    using System.Security.Cryptography; 
    using System.IdentityModel.Selectors;
    using System.IdentityModel.Tokens; 
    using System.Text;
    using System.Xml;

    class ExclusiveCanonicalizationTransform : Transform 
    {
        readonly bool includeComments; 
        string inclusiveNamespacesPrefixList; 
        string[] inclusivePrefixes;
        string inclusiveListElementPrefix = ExclusiveC14NStrings.Prefix; 
        string prefix = XmlSignatureStrings.Prefix;
        readonly bool isCanonicalizationMethod;

        public ExclusiveCanonicalizationTransform() 
            : this(false)
        { 
        } 

        public ExclusiveCanonicalizationTransform(bool isCanonicalizationMethod) 
            : this(isCanonicalizationMethod, false)
        {
            this.isCanonicalizationMethod = isCanonicalizationMethod;
        } 

        protected ExclusiveCanonicalizationTransform(bool isCanonicalizationMethod, bool includeComments) 
        { 
            this.isCanonicalizationMethod = isCanonicalizationMethod;
            this.includeComments = includeComments; 
        }

        public override string Algorithm
        { 
            get
            { 
                return this.includeComments ? XD.SecurityAlgorithmDictionary.ExclusiveC14nWithComments.Value : XD.SecurityAlgorithmDictionary.ExclusiveC14n.Value; 
            }
        } 

        public bool IncludeComments
        {
            get 
            {
                return this.includeComments; 
            } 
        }
 
        public string InclusiveNamespacesPrefixList
        {
            get
            { 
                return this.inclusiveNamespacesPrefixList;
            } 
            set 
            {
                this.inclusiveNamespacesPrefixList = value; 
                this.inclusivePrefixes = TokenizeInclusivePrefixList(value);
            }
        }
 
        public override bool NeedsInclusiveContext
        { 
            get { return GetInclusivePrefixes() != null; } 
        }
 
        public string[] GetInclusivePrefixes()
        {
            return this.inclusivePrefixes;
        } 

        CanonicalizationDriver GetConfiguredDriver(SignatureResourcePool resourcePool) 
        { 
            CanonicalizationDriver driver = resourcePool.TakeCanonicalizationDriver();
            driver.IncludeComments = this.IncludeComments; 
            driver.SetInclusivePrefixes(this.inclusivePrefixes);
            return driver;
        }
 
        // multi-transform case, inefficient path
        public override object Process(object input, SignatureResourcePool resourcePool, DictionaryManager dictionaryManager) 
        { 
            if (input is XmlReader)
            { 
                CanonicalizationDriver driver = GetConfiguredDriver(resourcePool);
                driver.SetInput(input as XmlReader);
                return driver.GetMemoryStream();
            } 
            else if (input is ISecurityElement)
            { 
                MemoryStream stream = new MemoryStream(); 
                XmlDictionaryWriter utf8Writer = resourcePool.TakeUtf8Writer();
                utf8Writer.StartCanonicalization(stream, false, null); 
                (input as ISecurityElement).WriteTo(utf8Writer, dictionaryManager);
                utf8Writer.EndCanonicalization();
                stream.Seek(0, SeekOrigin.Begin);
                return stream; 
            }
            else 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(SR.GetString(SR.UnsupportedInputTypeForTransform, input.GetType())));
            } 
        }

        // common single-transform case; fold directly into a digest
        public override byte[] ProcessAndDigest(object input, SignatureResourcePool resourcePool, string digestAlgorithm, DictionaryManager dictionaryManager) 
        {
            HashAlgorithm hash = resourcePool.TakeHashAlgorithm(digestAlgorithm); 
            ProcessAndDigest(input, resourcePool, hash, dictionaryManager); 
            return hash.Hash;
        } 

        public void ProcessAndDigest(object input, SignatureResourcePool resourcePool, HashAlgorithm hash, DictionaryManager dictionaryManger)
        {
            HashStream hashStream = resourcePool.TakeHashStream(hash); 

            XmlReader reader = input as XmlReader; 
            if (reader != null) 
            {
                ProcessReaderInput(reader, resourcePool, hashStream); 
            }
            else if (input is ISecurityElement)
            {
                XmlDictionaryWriter utf8Writer = resourcePool.TakeUtf8Writer(); 
                utf8Writer.StartCanonicalization(hashStream, this.IncludeComments, GetInclusivePrefixes());
                (input as ISecurityElement).WriteTo(utf8Writer, dictionaryManger); 
                utf8Writer.EndCanonicalization(); 
            }
            else 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(SR.GetString(SR.UnsupportedInputTypeForTransform, input.GetType())));
            }
 
            hashStream.FlushHash();
        } 
 
        void ProcessReaderInput(XmlReader reader, SignatureResourcePool resourcePool, HashStream hashStream)
        { 
            reader.MoveToContent();
            XmlDictionaryReader dictionaryReader = reader as XmlDictionaryReader;
            if (dictionaryReader != null && dictionaryReader.CanCanonicalize)
            { 
                dictionaryReader.StartCanonicalization(hashStream, this.IncludeComments, GetInclusivePrefixes());
                dictionaryReader.Skip(); 
                dictionaryReader.EndCanonicalization(); 
             }
            else 
            {
                CanonicalizationDriver driver = GetConfiguredDriver(resourcePool);
                driver.SetInput(reader);
                driver.WriteTo(hashStream); 
            }
        } 
 
        public override void ReadFrom(XmlDictionaryReader reader, DictionaryManager dictionaryManager)
        { 
            XmlDictionaryString elementName = this.isCanonicalizationMethod ?
                dictionaryManager.XmlSignatureDictionary.CanonicalizationMethod : dictionaryManager.XmlSignatureDictionary.Transform;
            reader.MoveToStartElement(elementName, dictionaryManager.XmlSignatureDictionary.Namespace);
            this.prefix = reader.Prefix; 
            bool isEmptyElement = reader.IsEmptyElement;
            string algorithm = reader.GetAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null); 
            if (algorithm != this.Algorithm) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CryptographicException(SR.GetString(SR.AlgorithmMismatchForTransform))); 
            }
            reader.Read();
            reader.MoveToContent();
 
            if (!isEmptyElement)
            { 
                if (reader.IsStartElement(dictionaryManager.ExclusiveC14NDictionary.InclusiveNamespaces, dictionaryManager.ExclusiveC14NDictionary.Namespace)) 
                {
                    reader.MoveToStartElement(dictionaryManager.ExclusiveC14NDictionary.InclusiveNamespaces, dictionaryManager.ExclusiveC14NDictionary.Namespace); 
                    this.inclusiveListElementPrefix = reader.Prefix;
                    bool emptyElement = reader.IsEmptyElement;
                    // We treat PrefixList as optional Attribute.
                    this.InclusiveNamespacesPrefixList = reader.GetAttribute(dictionaryManager.ExclusiveC14NDictionary.PrefixList, null); 
                    reader.Read();
                    if (!emptyElement) 
                        reader.ReadEndElement(); 
                }
                reader.MoveToContent(); 
                reader.ReadEndElement(); // Transform
            }
        }
 
        public override void WriteTo(XmlDictionaryWriter writer, DictionaryManager dictionaryManager)
        { 
            XmlDictionaryString elementName = this.isCanonicalizationMethod ? 
                dictionaryManager.XmlSignatureDictionary.CanonicalizationMethod : dictionaryManager.XmlSignatureDictionary.Transform;
            XmlDictionaryString algorithm = this.includeComments ? dictionaryManager.SecurityAlgorithmDictionary.ExclusiveC14nWithComments : dictionaryManager.SecurityAlgorithmDictionary.ExclusiveC14n; 

            writer.WriteStartElement(this.prefix, elementName, dictionaryManager.XmlSignatureDictionary.Namespace);
            writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
            if (algorithm != null) 
            {
                writer.WriteString(algorithm); 
            } 
            else
            { 
                writer.WriteString(algorithm.Value);
            }
            writer.WriteEndAttribute();
            if (this.InclusiveNamespacesPrefixList != null) 
            {
                writer.WriteStartElement(this.inclusiveListElementPrefix, dictionaryManager.ExclusiveC14NDictionary.InclusiveNamespaces, dictionaryManager.ExclusiveC14NDictionary.Namespace); 
                writer.WriteAttributeString(dictionaryManager.ExclusiveC14NDictionary.PrefixList, null, this.InclusiveNamespacesPrefixList); 
                writer.WriteEndElement(); // InclusiveNamespaces
            } 

            writer.WriteEndElement(); // Transform
        }
 
        static string[] TokenizeInclusivePrefixList(string prefixList)
        { 
            if (prefixList == null) 
            {
                return null; 
            }
            string[] prefixes = prefixList.Split(null);
            int count = 0;
            for (int i = 0; i < prefixes.Length; i++) 
            {
                string prefix = prefixes[i]; 
                if (prefix == "#default") 
                {
                    prefixes[count++] = string.Empty; 
                }
                else if (prefix.Length > 0)
                {
                    prefixes[count++] = prefix; 
                }
            } 
            if (count == 0) 
            {
                return null; 
            }
            else if (count == prefixes.Length)
            {
                return prefixes; 
            }
            else 
            { 
                string[] result = new string[count];
                Array.Copy(prefixes, result, count); 
                return result;
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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