SamlAssertion.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Tokens / SamlAssertion.cs / 1305376 / SamlAssertion.cs

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

namespace System.IdentityModel.Tokens 
{
    using System.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.Globalization;
    using System.IO; 
    using System.IdentityModel;
    using System.IdentityModel.Claims;
    using System.IdentityModel.Policy;
    using System.IdentityModel.Selectors; 
    using System.Runtime;
    using System.Runtime.InteropServices; 
    using System.Security; 
    using System.Security.Cryptography;
    using System.Xml; 

    public class SamlAssertion : ICanonicalWriterEndRootElementCallback
    {
        string assertionId = SamlConstants.AssertionIdPrefix + Guid.NewGuid().ToString(); 
        string issuer;
        DateTime issueInstant = DateTime.UtcNow.ToUniversalTime(); 
        SamlConditions conditions; 
        SamlAdvice advice;
        readonly ImmutableCollection statements = new ImmutableCollection(); 
        ReadOnlyCollection cryptoList;

        SignedXml signature;
        SigningCredentials signingCredentials; 
        SecurityKey verificationKey;
        SecurityToken signingToken; 
 
        HashStream hashStream;
        XmlTokenStream tokenStream; 
        SecurityTokenSerializer keyInfoSerializer;
        DictionaryManager dictionaryManager;

        bool isReadOnly = false; 

        public SamlAssertion() 
        { 
        }
 
        public SamlAssertion(
            string assertionId,
            string issuer,
            DateTime issueInstant, 
            SamlConditions samlConditions,
            SamlAdvice samlAdvice, 
            IEnumerable samlStatements 
            )
        { 
            if (String.IsNullOrEmpty(assertionId))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIdRequired));

            if (!IsAssertionIdValid(assertionId)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIDIsInvalid, assertionId));
 
            if (String.IsNullOrEmpty(issuer)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIssuerRequired));
 
            if (samlStatements == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("samlStatements");
            } 

            this.assertionId = assertionId; 
            this.issuer = issuer; 
            this.issueInstant = issueInstant.ToUniversalTime();
            this.conditions = samlConditions; 
            this.advice = samlAdvice;

            foreach (SamlStatement samlStatement in samlStatements)
            { 
                if (samlStatement == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLEntityCannotBeNullOrEmpty, XD.SamlDictionary.Statement.Value)); 
 
                this.statements.Add(samlStatement);
            } 

            if (this.statements.Count == 0)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionRequireOneStatement));
        } 

        public int MinorVersion 
        { 
            get { return SamlConstants.MinorVersionValue; }
        } 

        public int MajorVersion
        {
            get { return SamlConstants.MajorVersionValue; } 
        }
 
        public string AssertionId 
        {
            get { return this.assertionId; } 
            set
            {
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                if (String.IsNullOrEmpty(value)) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIdRequired)); 

                this.assertionId = value; 
            }
        }

        public string Issuer 
        {
            get { return this.issuer; } 
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));

                if (String.IsNullOrEmpty(value))
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIssuerRequired)); 

                this.issuer = value; 
            } 
        }
 
        public DateTime IssueInstant
        {
            get { return this.issueInstant; }
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                this.issueInstant = value; 
            }
        }

        public SamlConditions Conditions 
        {
            get { return this.conditions; } 
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));

                this.conditions = value;
            } 
        }
 
        public SamlAdvice Advice 
        {
            get { return this.advice; } 
            set
            {
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                this.advice = value; 
            } 
        }
 
        public IList Statements
        {
            get
            { 
                return this.statements;
            } 
        } 

        public SigningCredentials SigningCredentials 
        {
            get { return this.signingCredentials; }
            set
            { 
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 
 
                this.signingCredentials = value;
            } 
        }

        internal SignedXml Signature
        { 
            get { return this.signature; }
        } 
 
        internal SecurityKey SignatureVerificationKey
        { 
            get { return this.verificationKey; }
        }

        public SecurityToken SigningToken 
        {
            get { return this.signingToken; } 
        } 

        public bool IsReadOnly 
        {
            get { return this.isReadOnly; }
        }
 
        internal ReadOnlyCollection SecurityKeys
        { 
            get 
            {
                return this.cryptoList; 
            }
        }

        public void MakeReadOnly() 
        {
            if (!this.isReadOnly) 
            { 
                if (this.conditions != null)
                    this.conditions.MakeReadOnly(); 

                if (this.advice != null)
                    this.advice.MakeReadOnly();
 
                foreach (SamlStatement statement in this.statements)
                { 
                    statement.MakeReadOnly(); 
                }
 
                this.statements.MakeReadOnly();

                if (this.cryptoList == null)
                { 
                    this.cryptoList = BuildCryptoList();
                } 
 
                this.isReadOnly = true;
            } 
        }

        protected void ReadSignature(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver, SamlSerializer samlSerializer)
        { 
            if (reader == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader"); 
 
            if (samlSerializer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("samlSerializer"); 

            if (this.signature != null)
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SAMLSignatureAlreadyRead)));
 
            // If the reader cannot canonicalize then buffer the signature element to a canonicalizing reader.
            XmlDictionaryReader effectiveReader = reader; 
            if (!effectiveReader.CanCanonicalize) 
            {
                MemoryStream stream = new MemoryStream(); 
                XmlDictionaryWriter writer = XmlDictionaryWriter.CreateBinaryWriter(stream, samlSerializer.DictionaryManager.ParentDictionary);
                writer.WriteNode(effectiveReader, false);
                writer.Flush();
                stream.Position = 0; 
                effectiveReader = XmlDictionaryReader.CreateBinaryReader(stream.GetBuffer(), 0, (int)stream.Length, samlSerializer.DictionaryManager.ParentDictionary, reader.Quotas);
                effectiveReader.MoveToContent(); 
                writer.Close(); 
            }
            SignedXml signedXml = new SignedXml(new StandardSignedInfo(samlSerializer.DictionaryManager), samlSerializer.DictionaryManager, keyInfoSerializer); 
            signedXml.TransformFactory = ExtendedTransformFactory.Instance;
            signedXml.ReadFrom(effectiveReader);
            SecurityKeyIdentifier securityKeyIdentifier = signedXml.Signature.KeyIdentifier;
            this.verificationKey = SamlSerializer.ResolveSecurityKey(securityKeyIdentifier, outOfBandTokenResolver); 
            if (this.verificationKey == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToResolveSignatureKey, this.issuer))); 
 
            this.signature = signedXml;
            this.signingToken = SamlSerializer.ResolveSecurityToken(securityKeyIdentifier, outOfBandTokenResolver); 
            if (this.signingToken == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlSigningTokenNotFound)));

            if (!ReferenceEquals(reader, effectiveReader)) 
                effectiveReader.Close();
        } 
 
        void CheckObjectValidity()
        { 
            if (String.IsNullOrEmpty(this.assertionId))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIdRequired)));

            if (!IsAssertionIdValid(this.assertionId)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIDIsInvalid)));
 
            if (String.IsNullOrEmpty(this.issuer)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIssuerRequired)));
 
            if (this.statements.Count == 0)
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionRequireOneStatement)));
        }
 
        bool IsAssertionIdValid(string assertionId)
        { 
            if (String.IsNullOrEmpty(assertionId)) 
                return false;
 
            // The first character of the Assertion ID should be a letter or a '_'
            return (((assertionId[0] >= 'A') && (assertionId[0] <= 'Z')) ||
                ((assertionId[0] >= 'a') && (assertionId[0] <= 'z')) ||
                (assertionId[0] == '_')); 
        }
 
        ReadOnlyCollection BuildCryptoList() 
        {
            List cryptoList = new List(); 

            for (int i = 0; i < this.statements.Count; ++i)
            {
                SamlSubjectStatement statement = this.statements[i] as SamlSubjectStatement; 
                if (statement != null)
                { 
                    bool skipCrypto = false; 
                    SecurityKey crypto = null;
                    if (statement.SamlSubject != null) 
                        crypto = statement.SamlSubject.Crypto;
                    InMemorySymmetricSecurityKey inMemorySymmetricSecurityKey = crypto as InMemorySymmetricSecurityKey;
                    if (inMemorySymmetricSecurityKey != null)
                    { 

                        // Verify that you have not already added this to crypto list. 
                        for (int j = 0; j < cryptoList.Count; ++j) 
                        {
                            if ((cryptoList[j] is InMemorySymmetricSecurityKey) && (cryptoList[j].KeySize == inMemorySymmetricSecurityKey.KeySize)) 
                            {
                                byte[] key1 = ((InMemorySymmetricSecurityKey)cryptoList[j]).GetSymmetricKey();
                                byte[] key2 = inMemorySymmetricSecurityKey.GetSymmetricKey();
                                int k = 0; 
                                for (k = 0; k < key1.Length; ++k)
                                { 
                                    if (key1[k] != key2[k]) 
                                    {
                                        break; 
                                    }
                                }
                                skipCrypto = (k == key1.Length);
                            } 

                            if (skipCrypto) 
                                break; 
                        }
                    } 
                    if (!skipCrypto && (crypto != null))
                    {
                        cryptoList.Add(crypto);
                    } 
                }
            } 
 
            return cryptoList.AsReadOnly();
 
        }

        void VerifySignature(SignedXml signature, SecurityKey signatureVerificationKey)
        { 
            if (signature == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("signature"); 
 
            if (signatureVerificationKey == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("signatureVerificatonKey"); 

            signature.StartSignatureVerification(signatureVerificationKey);
            signature.EnsureDigestValidity(this.assertionId, tokenStream);
            signature.CompleteSignatureVerification(); 
        }
 
        void ICanonicalWriterEndRootElementCallback.OnEndOfRootElement(XmlDictionaryWriter dictionaryWriter) 
        {
            byte[] hashValue = this.hashStream.FlushHashAndGetValue(); 

            PreDigestedSignedInfo signedInfo = new PreDigestedSignedInfo(this.dictionaryManager);
            signedInfo.AddEnvelopedSignatureTransform = true;
            signedInfo.CanonicalizationMethod = SecurityAlgorithms.ExclusiveC14n; 
            signedInfo.SignatureMethod = this.signingCredentials.SignatureAlgorithm;
            signedInfo.DigestMethod = this.signingCredentials.DigestAlgorithm; 
            signedInfo.AddReference(this.assertionId, hashValue); 

            SignedXml signedXml = new SignedXml(signedInfo, this.dictionaryManager, this.keyInfoSerializer); 
            signedXml.ComputeSignature(this.signingCredentials.SigningKey);
            signedXml.Signature.KeyIdentifier = this.signingCredentials.SigningKeyIdentifier;
            signedXml.WriteTo(dictionaryWriter);
        } 

        public virtual void ReadXml(XmlDictionaryReader reader, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver) 
        { 
            if (reader == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("ReadXml")); 

            if (samlSerializer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("samlSerializer"));
 
            XmlDictionaryReader dictionaryReader = XmlDictionaryReader.CreateDictionaryReader(reader);
            WrappedReader wrappedReader = new WrappedReader(dictionaryReader); 
#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null. 
            SamlDictionary dictionary = samlSerializer.DictionaryManager.SamlDictionary;
 
            if (!wrappedReader.IsStartElement(dictionary.Assertion, dictionary.Namespace))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLElementNotRecognized, wrappedReader.LocalName)));

            string attributeValue = wrappedReader.GetAttribute(dictionary.MajorVersion, null); 
            if (String.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingMajorVersionAttributeOnRead))); 
            int majorVersion = Int32.Parse(attributeValue, CultureInfo.InvariantCulture); 

            attributeValue = wrappedReader.GetAttribute(dictionary.MinorVersion, null); 
            if (String.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingMinorVersionAttributeOnRead)));

            int minorVersion = Int32.Parse(attributeValue, CultureInfo.InvariantCulture); 

            if ((majorVersion != SamlConstants.MajorVersionValue) || (minorVersion != SamlConstants.MinorVersionValue)) 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLTokenVersionNotSupported, majorVersion, minorVersion, SamlConstants.MajorVersionValue, SamlConstants.MinorVersionValue)));
            } 

            attributeValue = wrappedReader.GetAttribute(dictionary.AssertionId, null);
            if (string.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIdRequired))); 

            if (!IsAssertionIdValid(attributeValue)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIDIsInvalid, attributeValue))); 

            this.assertionId = attributeValue; 

            attributeValue = wrappedReader.GetAttribute(dictionary.Issuer, null);
            if (string.IsNullOrEmpty(attributeValue))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingIssuerAttributeOnRead))); 
            this.issuer = attributeValue;
 
            attributeValue = wrappedReader.GetAttribute(dictionary.IssueInstant, null); 
            if (!string.IsNullOrEmpty(attributeValue))
                this.issueInstant = DateTime.ParseExact( 
                    attributeValue, SamlConstants.AcceptedDateTimeFormats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None).ToUniversalTime();

            wrappedReader.MoveToContent();
            wrappedReader.Read(); 

            if (wrappedReader.IsStartElement(dictionary.Conditions, dictionary.Namespace)) 
            { 
                this.conditions = samlSerializer.LoadConditions(wrappedReader, keyInfoSerializer, outOfBandTokenResolver);
                if (this.conditions == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadCondtions)));
            }

            if (wrappedReader.IsStartElement(dictionary.Advice, dictionary.Namespace)) 
            {
                this.advice = samlSerializer.LoadAdvice(wrappedReader, keyInfoSerializer, outOfBandTokenResolver); 
                if (this.advice == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadAdvice)));
            } 

            while (wrappedReader.IsStartElement())
            {
#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null. 
                if (wrappedReader.IsStartElement(samlSerializer.DictionaryManager.XmlSignatureDictionary.Signature, samlSerializer.DictionaryManager.XmlSignatureDictionary.Namespace))
                { 
                    break; 
                }
                else 
                {
                    SamlStatement statement = samlSerializer.LoadStatement(wrappedReader, keyInfoSerializer, outOfBandTokenResolver);
                    if (statement == null)
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadStatement))); 
                    this.statements.Add(statement);
                } 
            } 

            if (this.statements.Count == 0) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionRequireOneStatementOnRead)));

            if (wrappedReader.IsStartElement(samlSerializer.DictionaryManager.XmlSignatureDictionary.Signature, samlSerializer.DictionaryManager.XmlSignatureDictionary.Namespace))
                this.ReadSignature(wrappedReader, keyInfoSerializer, outOfBandTokenResolver, samlSerializer); 

            wrappedReader.MoveToContent(); 
            wrappedReader.ReadEndElement(); 

            this.tokenStream = wrappedReader.XmlTokens; 

            if (this.signature != null)
            {
                VerifySignature(this.signature, this.verificationKey); 
            }
 
            BuildCryptoList(); 
        }
 
        internal void WriteTo(XmlWriter writer, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer)
        {
            if (writer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer"); 

            if ((this.signingCredentials == null) && (this.signature == null)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SamlAssertionMissingSigningCredentials))); 

            XmlDictionaryWriter dictionaryWriter = XmlDictionaryWriter.CreateDictionaryWriter(writer); 

            if (this.signingCredentials != null)
            {
                using (HashAlgorithm hash = CryptoHelper.CreateHashAlgorithm(this.signingCredentials.DigestAlgorithm)) 
                {
                    this.hashStream = new HashStream(hash); 
                    this.keyInfoSerializer = keyInfoSerializer; 
                    this.dictionaryManager = samlSerializer.DictionaryManager;
                    SamlDelegatingWriter delegatingWriter = new SamlDelegatingWriter(dictionaryWriter, this.hashStream, this, samlSerializer.DictionaryManager.ParentDictionary); 
                    this.WriteXml(delegatingWriter, samlSerializer, keyInfoSerializer);
                }
            }
            else 
            {
                this.tokenStream.SetElementExclusion(null, null); 
                this.tokenStream.WriteTo(dictionaryWriter, samlSerializer.DictionaryManager); 
            }
        } 

        public virtual void WriteXml(XmlDictionaryWriter writer, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer)
        {
            CheckObjectValidity(); 

            if (writer == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer"); 

            if (samlSerializer == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("samlSerializer"));

#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null.
            SamlDictionary dictionary = samlSerializer.DictionaryManager.SamlDictionary; 

            try 
            { 
                writer.WriteStartElement(dictionary.PreferredPrefix.Value, dictionary.Assertion, dictionary.Namespace);
 
                writer.WriteStartAttribute(dictionary.MajorVersion, null);
                writer.WriteValue(SamlConstants.MajorVersionValue);
                writer.WriteEndAttribute();
                writer.WriteStartAttribute(dictionary.MinorVersion, null); 
                writer.WriteValue(SamlConstants.MinorVersionValue);
                writer.WriteEndAttribute(); 
                writer.WriteStartAttribute(dictionary.AssertionId, null); 
                writer.WriteString(this.assertionId);
                writer.WriteEndAttribute(); 
                writer.WriteStartAttribute(dictionary.Issuer, null);
                writer.WriteString(this.issuer);
                writer.WriteEndAttribute();
                writer.WriteStartAttribute(dictionary.IssueInstant, null); 
                writer.WriteString(this.issueInstant.ToString(SamlConstants.GeneratedDateTimeFormat, CultureInfo.InvariantCulture));
                writer.WriteEndAttribute(); 
 
                // Write out conditions
                if (this.conditions != null) 
                {
                    this.conditions.WriteXml(writer, samlSerializer, keyInfoSerializer);
                }
 
                // Write out advice if there is one
                if (this.advice != null) 
                { 
                    this.advice.WriteXml(writer, samlSerializer, keyInfoSerializer);
                } 

                for (int i = 0; i < this.statements.Count; i++)
                {
                    this.statements[i].WriteXml(writer, samlSerializer, keyInfoSerializer); 
                }
 
                writer.WriteEndElement(); 
            }
            catch (Exception e) 
            {
                // Always immediately rethrow fatal exceptions.
                if (Fx.IsFatal(e)) throw;
 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SAMLTokenNotSerialized), e));
            } 
        } 

        static internal void AddSamlClaimTypes(ICollection knownClaimTypes) 
        {
            if (knownClaimTypes == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("knownClaimTypes"); 
            }
            knownClaimTypes.Add(typeof(SamlAuthorizationDecisionClaimResource)); 
            knownClaimTypes.Add(typeof(SamlAuthenticationClaimResource)); 
            knownClaimTypes.Add(typeof(SamlAccessDecision));
            knownClaimTypes.Add(typeof(SamlAuthorityBinding)); 
            knownClaimTypes.Add(typeof(SamlNameIdentifierClaimResource));
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.IdentityModel.Tokens 
{
    using System.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.Globalization;
    using System.IO; 
    using System.IdentityModel;
    using System.IdentityModel.Claims;
    using System.IdentityModel.Policy;
    using System.IdentityModel.Selectors; 
    using System.Runtime;
    using System.Runtime.InteropServices; 
    using System.Security; 
    using System.Security.Cryptography;
    using System.Xml; 

    public class SamlAssertion : ICanonicalWriterEndRootElementCallback
    {
        string assertionId = SamlConstants.AssertionIdPrefix + Guid.NewGuid().ToString(); 
        string issuer;
        DateTime issueInstant = DateTime.UtcNow.ToUniversalTime(); 
        SamlConditions conditions; 
        SamlAdvice advice;
        readonly ImmutableCollection statements = new ImmutableCollection(); 
        ReadOnlyCollection cryptoList;

        SignedXml signature;
        SigningCredentials signingCredentials; 
        SecurityKey verificationKey;
        SecurityToken signingToken; 
 
        HashStream hashStream;
        XmlTokenStream tokenStream; 
        SecurityTokenSerializer keyInfoSerializer;
        DictionaryManager dictionaryManager;

        bool isReadOnly = false; 

        public SamlAssertion() 
        { 
        }
 
        public SamlAssertion(
            string assertionId,
            string issuer,
            DateTime issueInstant, 
            SamlConditions samlConditions,
            SamlAdvice samlAdvice, 
            IEnumerable samlStatements 
            )
        { 
            if (String.IsNullOrEmpty(assertionId))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIdRequired));

            if (!IsAssertionIdValid(assertionId)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIDIsInvalid, assertionId));
 
            if (String.IsNullOrEmpty(issuer)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIssuerRequired));
 
            if (samlStatements == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("samlStatements");
            } 

            this.assertionId = assertionId; 
            this.issuer = issuer; 
            this.issueInstant = issueInstant.ToUniversalTime();
            this.conditions = samlConditions; 
            this.advice = samlAdvice;

            foreach (SamlStatement samlStatement in samlStatements)
            { 
                if (samlStatement == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLEntityCannotBeNullOrEmpty, XD.SamlDictionary.Statement.Value)); 
 
                this.statements.Add(samlStatement);
            } 

            if (this.statements.Count == 0)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionRequireOneStatement));
        } 

        public int MinorVersion 
        { 
            get { return SamlConstants.MinorVersionValue; }
        } 

        public int MajorVersion
        {
            get { return SamlConstants.MajorVersionValue; } 
        }
 
        public string AssertionId 
        {
            get { return this.assertionId; } 
            set
            {
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                if (String.IsNullOrEmpty(value)) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIdRequired)); 

                this.assertionId = value; 
            }
        }

        public string Issuer 
        {
            get { return this.issuer; } 
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));

                if (String.IsNullOrEmpty(value))
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.SAMLAssertionIssuerRequired)); 

                this.issuer = value; 
            } 
        }
 
        public DateTime IssueInstant
        {
            get { return this.issueInstant; }
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                this.issueInstant = value; 
            }
        }

        public SamlConditions Conditions 
        {
            get { return this.conditions; } 
            set 
            {
                if (isReadOnly) 
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));

                this.conditions = value;
            } 
        }
 
        public SamlAdvice Advice 
        {
            get { return this.advice; } 
            set
            {
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 

                this.advice = value; 
            } 
        }
 
        public IList Statements
        {
            get
            { 
                return this.statements;
            } 
        } 

        public SigningCredentials SigningCredentials 
        {
            get { return this.signingCredentials; }
            set
            { 
                if (isReadOnly)
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly))); 
 
                this.signingCredentials = value;
            } 
        }

        internal SignedXml Signature
        { 
            get { return this.signature; }
        } 
 
        internal SecurityKey SignatureVerificationKey
        { 
            get { return this.verificationKey; }
        }

        public SecurityToken SigningToken 
        {
            get { return this.signingToken; } 
        } 

        public bool IsReadOnly 
        {
            get { return this.isReadOnly; }
        }
 
        internal ReadOnlyCollection SecurityKeys
        { 
            get 
            {
                return this.cryptoList; 
            }
        }

        public void MakeReadOnly() 
        {
            if (!this.isReadOnly) 
            { 
                if (this.conditions != null)
                    this.conditions.MakeReadOnly(); 

                if (this.advice != null)
                    this.advice.MakeReadOnly();
 
                foreach (SamlStatement statement in this.statements)
                { 
                    statement.MakeReadOnly(); 
                }
 
                this.statements.MakeReadOnly();

                if (this.cryptoList == null)
                { 
                    this.cryptoList = BuildCryptoList();
                } 
 
                this.isReadOnly = true;
            } 
        }

        protected void ReadSignature(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver, SamlSerializer samlSerializer)
        { 
            if (reader == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader"); 
 
            if (samlSerializer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("samlSerializer"); 

            if (this.signature != null)
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SAMLSignatureAlreadyRead)));
 
            // If the reader cannot canonicalize then buffer the signature element to a canonicalizing reader.
            XmlDictionaryReader effectiveReader = reader; 
            if (!effectiveReader.CanCanonicalize) 
            {
                MemoryStream stream = new MemoryStream(); 
                XmlDictionaryWriter writer = XmlDictionaryWriter.CreateBinaryWriter(stream, samlSerializer.DictionaryManager.ParentDictionary);
                writer.WriteNode(effectiveReader, false);
                writer.Flush();
                stream.Position = 0; 
                effectiveReader = XmlDictionaryReader.CreateBinaryReader(stream.GetBuffer(), 0, (int)stream.Length, samlSerializer.DictionaryManager.ParentDictionary, reader.Quotas);
                effectiveReader.MoveToContent(); 
                writer.Close(); 
            }
            SignedXml signedXml = new SignedXml(new StandardSignedInfo(samlSerializer.DictionaryManager), samlSerializer.DictionaryManager, keyInfoSerializer); 
            signedXml.TransformFactory = ExtendedTransformFactory.Instance;
            signedXml.ReadFrom(effectiveReader);
            SecurityKeyIdentifier securityKeyIdentifier = signedXml.Signature.KeyIdentifier;
            this.verificationKey = SamlSerializer.ResolveSecurityKey(securityKeyIdentifier, outOfBandTokenResolver); 
            if (this.verificationKey == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToResolveSignatureKey, this.issuer))); 
 
            this.signature = signedXml;
            this.signingToken = SamlSerializer.ResolveSecurityToken(securityKeyIdentifier, outOfBandTokenResolver); 
            if (this.signingToken == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlSigningTokenNotFound)));

            if (!ReferenceEquals(reader, effectiveReader)) 
                effectiveReader.Close();
        } 
 
        void CheckObjectValidity()
        { 
            if (String.IsNullOrEmpty(this.assertionId))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIdRequired)));

            if (!IsAssertionIdValid(this.assertionId)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIDIsInvalid)));
 
            if (String.IsNullOrEmpty(this.issuer)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIssuerRequired)));
 
            if (this.statements.Count == 0)
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionRequireOneStatement)));
        }
 
        bool IsAssertionIdValid(string assertionId)
        { 
            if (String.IsNullOrEmpty(assertionId)) 
                return false;
 
            // The first character of the Assertion ID should be a letter or a '_'
            return (((assertionId[0] >= 'A') && (assertionId[0] <= 'Z')) ||
                ((assertionId[0] >= 'a') && (assertionId[0] <= 'z')) ||
                (assertionId[0] == '_')); 
        }
 
        ReadOnlyCollection BuildCryptoList() 
        {
            List cryptoList = new List(); 

            for (int i = 0; i < this.statements.Count; ++i)
            {
                SamlSubjectStatement statement = this.statements[i] as SamlSubjectStatement; 
                if (statement != null)
                { 
                    bool skipCrypto = false; 
                    SecurityKey crypto = null;
                    if (statement.SamlSubject != null) 
                        crypto = statement.SamlSubject.Crypto;
                    InMemorySymmetricSecurityKey inMemorySymmetricSecurityKey = crypto as InMemorySymmetricSecurityKey;
                    if (inMemorySymmetricSecurityKey != null)
                    { 

                        // Verify that you have not already added this to crypto list. 
                        for (int j = 0; j < cryptoList.Count; ++j) 
                        {
                            if ((cryptoList[j] is InMemorySymmetricSecurityKey) && (cryptoList[j].KeySize == inMemorySymmetricSecurityKey.KeySize)) 
                            {
                                byte[] key1 = ((InMemorySymmetricSecurityKey)cryptoList[j]).GetSymmetricKey();
                                byte[] key2 = inMemorySymmetricSecurityKey.GetSymmetricKey();
                                int k = 0; 
                                for (k = 0; k < key1.Length; ++k)
                                { 
                                    if (key1[k] != key2[k]) 
                                    {
                                        break; 
                                    }
                                }
                                skipCrypto = (k == key1.Length);
                            } 

                            if (skipCrypto) 
                                break; 
                        }
                    } 
                    if (!skipCrypto && (crypto != null))
                    {
                        cryptoList.Add(crypto);
                    } 
                }
            } 
 
            return cryptoList.AsReadOnly();
 
        }

        void VerifySignature(SignedXml signature, SecurityKey signatureVerificationKey)
        { 
            if (signature == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("signature"); 
 
            if (signatureVerificationKey == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("signatureVerificatonKey"); 

            signature.StartSignatureVerification(signatureVerificationKey);
            signature.EnsureDigestValidity(this.assertionId, tokenStream);
            signature.CompleteSignatureVerification(); 
        }
 
        void ICanonicalWriterEndRootElementCallback.OnEndOfRootElement(XmlDictionaryWriter dictionaryWriter) 
        {
            byte[] hashValue = this.hashStream.FlushHashAndGetValue(); 

            PreDigestedSignedInfo signedInfo = new PreDigestedSignedInfo(this.dictionaryManager);
            signedInfo.AddEnvelopedSignatureTransform = true;
            signedInfo.CanonicalizationMethod = SecurityAlgorithms.ExclusiveC14n; 
            signedInfo.SignatureMethod = this.signingCredentials.SignatureAlgorithm;
            signedInfo.DigestMethod = this.signingCredentials.DigestAlgorithm; 
            signedInfo.AddReference(this.assertionId, hashValue); 

            SignedXml signedXml = new SignedXml(signedInfo, this.dictionaryManager, this.keyInfoSerializer); 
            signedXml.ComputeSignature(this.signingCredentials.SigningKey);
            signedXml.Signature.KeyIdentifier = this.signingCredentials.SigningKeyIdentifier;
            signedXml.WriteTo(dictionaryWriter);
        } 

        public virtual void ReadXml(XmlDictionaryReader reader, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver) 
        { 
            if (reader == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("ReadXml")); 

            if (samlSerializer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("samlSerializer"));
 
            XmlDictionaryReader dictionaryReader = XmlDictionaryReader.CreateDictionaryReader(reader);
            WrappedReader wrappedReader = new WrappedReader(dictionaryReader); 
#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null. 
            SamlDictionary dictionary = samlSerializer.DictionaryManager.SamlDictionary;
 
            if (!wrappedReader.IsStartElement(dictionary.Assertion, dictionary.Namespace))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLElementNotRecognized, wrappedReader.LocalName)));

            string attributeValue = wrappedReader.GetAttribute(dictionary.MajorVersion, null); 
            if (String.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingMajorVersionAttributeOnRead))); 
            int majorVersion = Int32.Parse(attributeValue, CultureInfo.InvariantCulture); 

            attributeValue = wrappedReader.GetAttribute(dictionary.MinorVersion, null); 
            if (String.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingMinorVersionAttributeOnRead)));

            int minorVersion = Int32.Parse(attributeValue, CultureInfo.InvariantCulture); 

            if ((majorVersion != SamlConstants.MajorVersionValue) || (minorVersion != SamlConstants.MinorVersionValue)) 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLTokenVersionNotSupported, majorVersion, minorVersion, SamlConstants.MajorVersionValue, SamlConstants.MinorVersionValue)));
            } 

            attributeValue = wrappedReader.GetAttribute(dictionary.AssertionId, null);
            if (string.IsNullOrEmpty(attributeValue))
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIdRequired))); 

            if (!IsAssertionIdValid(attributeValue)) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionIDIsInvalid, attributeValue))); 

            this.assertionId = attributeValue; 

            attributeValue = wrappedReader.GetAttribute(dictionary.Issuer, null);
            if (string.IsNullOrEmpty(attributeValue))
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionMissingIssuerAttributeOnRead))); 
            this.issuer = attributeValue;
 
            attributeValue = wrappedReader.GetAttribute(dictionary.IssueInstant, null); 
            if (!string.IsNullOrEmpty(attributeValue))
                this.issueInstant = DateTime.ParseExact( 
                    attributeValue, SamlConstants.AcceptedDateTimeFormats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None).ToUniversalTime();

            wrappedReader.MoveToContent();
            wrappedReader.Read(); 

            if (wrappedReader.IsStartElement(dictionary.Conditions, dictionary.Namespace)) 
            { 
                this.conditions = samlSerializer.LoadConditions(wrappedReader, keyInfoSerializer, outOfBandTokenResolver);
                if (this.conditions == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadCondtions)));
            }

            if (wrappedReader.IsStartElement(dictionary.Advice, dictionary.Namespace)) 
            {
                this.advice = samlSerializer.LoadAdvice(wrappedReader, keyInfoSerializer, outOfBandTokenResolver); 
                if (this.advice == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadAdvice)));
            } 

            while (wrappedReader.IsStartElement())
            {
#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null. 
                if (wrappedReader.IsStartElement(samlSerializer.DictionaryManager.XmlSignatureDictionary.Signature, samlSerializer.DictionaryManager.XmlSignatureDictionary.Namespace))
                { 
                    break; 
                }
                else 
                {
                    SamlStatement statement = samlSerializer.LoadStatement(wrappedReader, keyInfoSerializer, outOfBandTokenResolver);
                    if (statement == null)
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadStatement))); 
                    this.statements.Add(statement);
                } 
            } 

            if (this.statements.Count == 0) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAssertionRequireOneStatementOnRead)));

            if (wrappedReader.IsStartElement(samlSerializer.DictionaryManager.XmlSignatureDictionary.Signature, samlSerializer.DictionaryManager.XmlSignatureDictionary.Namespace))
                this.ReadSignature(wrappedReader, keyInfoSerializer, outOfBandTokenResolver, samlSerializer); 

            wrappedReader.MoveToContent(); 
            wrappedReader.ReadEndElement(); 

            this.tokenStream = wrappedReader.XmlTokens; 

            if (this.signature != null)
            {
                VerifySignature(this.signature, this.verificationKey); 
            }
 
            BuildCryptoList(); 
        }
 
        internal void WriteTo(XmlWriter writer, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer)
        {
            if (writer == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer"); 

            if ((this.signingCredentials == null) && (this.signature == null)) 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SamlAssertionMissingSigningCredentials))); 

            XmlDictionaryWriter dictionaryWriter = XmlDictionaryWriter.CreateDictionaryWriter(writer); 

            if (this.signingCredentials != null)
            {
                using (HashAlgorithm hash = CryptoHelper.CreateHashAlgorithm(this.signingCredentials.DigestAlgorithm)) 
                {
                    this.hashStream = new HashStream(hash); 
                    this.keyInfoSerializer = keyInfoSerializer; 
                    this.dictionaryManager = samlSerializer.DictionaryManager;
                    SamlDelegatingWriter delegatingWriter = new SamlDelegatingWriter(dictionaryWriter, this.hashStream, this, samlSerializer.DictionaryManager.ParentDictionary); 
                    this.WriteXml(delegatingWriter, samlSerializer, keyInfoSerializer);
                }
            }
            else 
            {
                this.tokenStream.SetElementExclusion(null, null); 
                this.tokenStream.WriteTo(dictionaryWriter, samlSerializer.DictionaryManager); 
            }
        } 

        public virtual void WriteXml(XmlDictionaryWriter writer, SamlSerializer samlSerializer, SecurityTokenSerializer keyInfoSerializer)
        {
            CheckObjectValidity(); 

            if (writer == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer"); 

            if (samlSerializer == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("samlSerializer"));

#pragma warning suppress 56506 // samlSerializer.DictionaryManager is never null.
            SamlDictionary dictionary = samlSerializer.DictionaryManager.SamlDictionary; 

            try 
            { 
                writer.WriteStartElement(dictionary.PreferredPrefix.Value, dictionary.Assertion, dictionary.Namespace);
 
                writer.WriteStartAttribute(dictionary.MajorVersion, null);
                writer.WriteValue(SamlConstants.MajorVersionValue);
                writer.WriteEndAttribute();
                writer.WriteStartAttribute(dictionary.MinorVersion, null); 
                writer.WriteValue(SamlConstants.MinorVersionValue);
                writer.WriteEndAttribute(); 
                writer.WriteStartAttribute(dictionary.AssertionId, null); 
                writer.WriteString(this.assertionId);
                writer.WriteEndAttribute(); 
                writer.WriteStartAttribute(dictionary.Issuer, null);
                writer.WriteString(this.issuer);
                writer.WriteEndAttribute();
                writer.WriteStartAttribute(dictionary.IssueInstant, null); 
                writer.WriteString(this.issueInstant.ToString(SamlConstants.GeneratedDateTimeFormat, CultureInfo.InvariantCulture));
                writer.WriteEndAttribute(); 
 
                // Write out conditions
                if (this.conditions != null) 
                {
                    this.conditions.WriteXml(writer, samlSerializer, keyInfoSerializer);
                }
 
                // Write out advice if there is one
                if (this.advice != null) 
                { 
                    this.advice.WriteXml(writer, samlSerializer, keyInfoSerializer);
                } 

                for (int i = 0; i < this.statements.Count; i++)
                {
                    this.statements[i].WriteXml(writer, samlSerializer, keyInfoSerializer); 
                }
 
                writer.WriteEndElement(); 
            }
            catch (Exception e) 
            {
                // Always immediately rethrow fatal exceptions.
                if (Fx.IsFatal(e)) throw;
 
                throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SAMLTokenNotSerialized), e));
            } 
        } 

        static internal void AddSamlClaimTypes(ICollection knownClaimTypes) 
        {
            if (knownClaimTypes == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("knownClaimTypes"); 
            }
            knownClaimTypes.Add(typeof(SamlAuthorizationDecisionClaimResource)); 
            knownClaimTypes.Add(typeof(SamlAuthenticationClaimResource)); 
            knownClaimTypes.Add(typeof(SamlAccessDecision));
            knownClaimTypes.Add(typeof(SamlAuthorityBinding)); 
            knownClaimTypes.Add(typeof(SamlNameIdentifierClaimResource));
        }
    }
} 

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

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