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327 lines
15 KiB
C#
327 lines
15 KiB
C#
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//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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namespace System.IdentityModel
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{
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using System.Diagnostics;
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using System.IO;
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using System.Security.Cryptography;
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using System.IdentityModel.Tokens;
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using System.Text;
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using System.Xml;
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sealed class PreDigestedSignedInfo : SignedInfo
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{
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const int InitialReferenceArraySize = 8;
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bool addEnvelopedSignatureTransform;
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int count;
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string digestMethod;
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XmlDictionaryString digestMethodDictionaryString;
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ReferenceEntry[] references;
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public PreDigestedSignedInfo(DictionaryManager dictionaryManager)
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: base(dictionaryManager)
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{
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this.references = new ReferenceEntry[InitialReferenceArraySize];
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}
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public PreDigestedSignedInfo(DictionaryManager dictionaryManager, string canonicalizationMethod, XmlDictionaryString canonicalizationMethodDictionaryString, string digestMethod, XmlDictionaryString digestMethodDictionaryString, string signatureMethod, XmlDictionaryString signatureMethodDictionaryString)
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: base(dictionaryManager)
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{
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this.references = new ReferenceEntry[InitialReferenceArraySize];
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this.CanonicalizationMethod = canonicalizationMethod;
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this.CanonicalizationMethodDictionaryString = canonicalizationMethodDictionaryString;
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this.DigestMethod = digestMethod;
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this.digestMethodDictionaryString = digestMethodDictionaryString;
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this.SignatureMethod = signatureMethod;
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this.SignatureMethodDictionaryString = signatureMethodDictionaryString;
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}
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public bool AddEnvelopedSignatureTransform
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{
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get { return this.addEnvelopedSignatureTransform; }
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set { this.addEnvelopedSignatureTransform = value; }
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}
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public string DigestMethod
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{
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get { return this.digestMethod; }
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set { this.digestMethod = value; }
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}
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public override int ReferenceCount
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{
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get { return this.count; }
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}
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public void AddReference(string id, byte[] digest)
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{
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AddReference(id, digest, false);
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}
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public void AddReference(string id, byte[] digest, bool useStrTransform)
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{
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if (this.count == this.references.Length)
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{
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ReferenceEntry[] newReferences = new ReferenceEntry[this.references.Length * 2];
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Array.Copy(this.references, 0, newReferences, 0, this.count);
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this.references = newReferences;
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}
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this.references[this.count++].Set(id, digest, useStrTransform);
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}
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protected override void ComputeHash(HashStream hashStream)
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{
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if (this.AddEnvelopedSignatureTransform)
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{
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base.ComputeHash(hashStream);
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}
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else
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{
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SignedInfoCanonicalFormWriter.Instance.WriteSignedInfoCanonicalForm(
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hashStream, this.SignatureMethod, this.DigestMethod,
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this.references, this.count,
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this.ResourcePool.TakeEncodingBuffer(), this.ResourcePool.TakeBase64Buffer());
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}
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}
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public override void ComputeReferenceDigests()
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{
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// all digests pre-computed
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}
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public override void ReadFrom(XmlDictionaryReader reader, TransformFactory transformFactory, DictionaryManager dictionaryManager)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException()); // sender side use only
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}
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public override void EnsureAllReferencesVerified()
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException()); // sender side use only
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}
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public override bool EnsureDigestValidityIfIdMatches(string id, object resolvedXmlSource)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException()); // sender side use only
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}
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public override void WriteTo(XmlDictionaryWriter writer, DictionaryManager dictionaryManager)
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{
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string prefix = XmlSignatureStrings.Prefix;
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XmlDictionaryString ns = dictionaryManager.XmlSignatureDictionary.Namespace;
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.SignedInfo, ns);
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if (this.Id != null)
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{
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writer.WriteAttributeString(dictionaryManager.UtilityDictionary.IdAttribute, null, this.Id);
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}
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WriteCanonicalizationMethod(writer, dictionaryManager);
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WriteSignatureMethod(writer, dictionaryManager);
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for (int i = 0; i < this.count; i++)
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{
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.Reference, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.URI, null);
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writer.WriteString("#");
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writer.WriteString(this.references[i].id);
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writer.WriteEndAttribute();
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.Transforms, ns);
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if (this.addEnvelopedSignatureTransform)
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{
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.Transform, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
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writer.WriteString(dictionaryManager.XmlSignatureDictionary.EnvelopedSignature);
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writer.WriteEndAttribute();
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writer.WriteEndElement(); // Transform
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}
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if (this.references[i].useStrTransform)
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{
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.Transform, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
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writer.WriteString(SecurityAlgorithms.StrTransform);
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writer.WriteEndAttribute();
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writer.WriteStartElement(XmlSignatureStrings.SecurityJan2004Prefix, XmlSignatureStrings.TransformationParameters, XmlSignatureStrings.SecurityJan2004Namespace); //<wsse:TransformationParameters>
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.CanonicalizationMethod, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
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writer.WriteString(dictionaryManager.SecurityAlgorithmDictionary.ExclusiveC14n);
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writer.WriteEndAttribute();
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writer.WriteEndElement(); //CanonicalizationMethod
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writer.WriteEndElement(); // TransformationParameters
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writer.WriteEndElement(); // Transform
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}
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else
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{
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.Transform, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
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writer.WriteString(dictionaryManager.SecurityAlgorithmDictionary.ExclusiveC14n);
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writer.WriteEndAttribute();
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writer.WriteEndElement(); // Transform
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}
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writer.WriteEndElement(); // Transforms
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.DigestMethod, ns);
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writer.WriteStartAttribute(dictionaryManager.XmlSignatureDictionary.Algorithm, null);
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if (this.digestMethodDictionaryString != null)
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{
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writer.WriteString(this.digestMethodDictionaryString);
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}
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else
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{
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writer.WriteString(this.digestMethod);
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}
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writer.WriteEndAttribute();
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writer.WriteEndElement(); // DigestMethod
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byte[] digest = this.references[i].digest;
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writer.WriteStartElement(prefix, dictionaryManager.XmlSignatureDictionary.DigestValue, ns);
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writer.WriteBase64(digest, 0, digest.Length);
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writer.WriteEndElement(); // DigestValue
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writer.WriteEndElement(); // Reference
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}
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writer.WriteEndElement(); // SignedInfo
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}
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struct ReferenceEntry
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{
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internal string id;
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internal byte[] digest;
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internal bool useStrTransform;
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public void Set(string id, byte[] digest, bool useStrTransform)
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{
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if (useStrTransform && string.IsNullOrEmpty(id))
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(id));
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}
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this.id = id;
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this.digest = digest;
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this.useStrTransform = useStrTransform;
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}
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}
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sealed class SignedInfoCanonicalFormWriter : CanonicalFormWriter
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{
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const string xml1 = "<SignedInfo xmlns=\"http://www.w3.org/2000/09/xmldsig#\"><CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"></CanonicalizationMethod><SignatureMethod Algorithm=\"";
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const string xml2 = "\"></SignatureMethod>";
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const string xml3 = "<Reference URI=\"#";
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const string xml4 = "\"><Transforms><Transform Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"></Transform></Transforms><DigestMethod Algorithm=\"";
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const string xml4WithStrTransform = "\"><Transforms><Transform Algorithm=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#STR-Transform\"><o:TransformationParameters xmlns:o=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\"><CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"></CanonicalizationMethod></o:TransformationParameters></Transform></Transforms><DigestMethod Algorithm=\"";
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const string xml5 = "\"></DigestMethod><DigestValue>";
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const string xml6 = "</DigestValue></Reference>";
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const string xml7 = "</SignedInfo>";
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readonly byte[] fragment1;
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readonly byte[] fragment2;
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readonly byte[] fragment3;
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readonly byte[] fragment4;
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readonly byte[] fragment4StrTransform;
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readonly byte[] fragment5;
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readonly byte[] fragment6;
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readonly byte[] fragment7;
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readonly byte[] sha1Digest;
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readonly byte[] sha256Digest;
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readonly byte[] hmacSha1Signature;
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readonly byte[] rsaSha1Signature;
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static readonly SignedInfoCanonicalFormWriter instance = new SignedInfoCanonicalFormWriter();
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SignedInfoCanonicalFormWriter()
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{
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UTF8Encoding encoding = CanonicalFormWriter.Utf8WithoutPreamble;
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this.fragment1 = encoding.GetBytes(xml1);
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this.fragment2 = encoding.GetBytes(xml2);
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this.fragment3 = encoding.GetBytes(xml3);
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this.fragment4 = encoding.GetBytes(xml4);
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this.fragment4StrTransform = encoding.GetBytes(xml4WithStrTransform);
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this.fragment5 = encoding.GetBytes(xml5);
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this.fragment6 = encoding.GetBytes(xml6);
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this.fragment7 = encoding.GetBytes(xml7);
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this.sha1Digest = encoding.GetBytes(SecurityAlgorithms.Sha1Digest);
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this.sha256Digest = encoding.GetBytes(SecurityAlgorithms.Sha256Digest);
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this.hmacSha1Signature = encoding.GetBytes(SecurityAlgorithms.HmacSha1Signature);
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this.rsaSha1Signature = encoding.GetBytes(SecurityAlgorithms.RsaSha1Signature);
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}
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public static SignedInfoCanonicalFormWriter Instance
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{
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get { return instance; }
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}
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byte[] EncodeDigestAlgorithm(string algorithm)
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{
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if (algorithm == SecurityAlgorithms.Sha1Digest)
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{
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return this.sha1Digest;
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}
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else if (algorithm == SecurityAlgorithms.Sha256Digest)
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{
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return this.sha256Digest;
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}
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else
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{
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return CanonicalFormWriter.Utf8WithoutPreamble.GetBytes(algorithm);
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}
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}
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byte[] EncodeSignatureAlgorithm(string algorithm)
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{
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if (algorithm == SecurityAlgorithms.HmacSha1Signature)
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{
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return this.hmacSha1Signature;
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}
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else if (algorithm == SecurityAlgorithms.RsaSha1Signature)
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{
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return this.rsaSha1Signature;
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}
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else
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{
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return CanonicalFormWriter.Utf8WithoutPreamble.GetBytes(algorithm);
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}
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}
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public void WriteSignedInfoCanonicalForm(
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Stream stream, string signatureMethod, string digestMethod,
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ReferenceEntry[] references, int referenceCount,
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byte[] workBuffer, char[] base64WorkBuffer)
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{
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DiagnosticUtility.DebugAssert(XmlSignatureStrings.Prefix.Length == 0, "Update SignedInfoCanonicalFormWriter to match new XmlDSig prefix");
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stream.Write(this.fragment1, 0, this.fragment1.Length);
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byte[] signatureMethodBytes = EncodeSignatureAlgorithm(signatureMethod);
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stream.Write(signatureMethodBytes, 0, signatureMethodBytes.Length);
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stream.Write(this.fragment2, 0, this.fragment2.Length);
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byte[] digestMethodBytes = EncodeDigestAlgorithm(digestMethod);
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for (int i = 0; i < referenceCount; i++)
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{
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stream.Write(this.fragment3, 0, this.fragment3.Length);
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EncodeAndWrite(stream, workBuffer, references[i].id);
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if (references[i].useStrTransform)
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{
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stream.Write(this.fragment4StrTransform, 0, this.fragment4StrTransform.Length);
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}
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else
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{
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stream.Write(this.fragment4, 0, this.fragment4.Length);
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}
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stream.Write(digestMethodBytes, 0, digestMethodBytes.Length);
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stream.Write(this.fragment5, 0, this.fragment5.Length);
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Base64EncodeAndWrite(stream, workBuffer, base64WorkBuffer, references[i].digest);
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stream.Write(this.fragment6, 0, this.fragment6.Length);
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}
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stream.Write(this.fragment7, 0, this.fragment7.Length);
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}
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}
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}
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}
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