EncryptedType.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Security / EncryptedType.cs / 1 / EncryptedType.cs
                        

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

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

    using DictionaryManager = System.IdentityModel.DictionaryManager; 
    using SignedXml = System.IdentityModel.SignedXml; 
    using ISecurityElement = System.IdentityModel.ISecurityElement;
 
    abstract class EncryptedType : ISecurityElement
    {
        internal static readonly XmlDictionaryString NamespaceUri = XD.XmlEncryptionDictionary.Namespace;
        internal static readonly XmlDictionaryString EncodingAttribute = XD.XmlEncryptionDictionary.Encoding; 
        internal static readonly XmlDictionaryString MimeTypeAttribute = XD.XmlEncryptionDictionary.MimeType;
        internal static readonly XmlDictionaryString TypeAttribute = XD.XmlEncryptionDictionary.Type; 
        internal static readonly XmlDictionaryString CipherDataElementName = XD.XmlEncryptionDictionary.CipherData; 
        internal static readonly XmlDictionaryString CipherValueElementName = XD.XmlEncryptionDictionary.CipherValue;
 
        string encoding;
        EncryptionMethodElement encryptionMethod;
        string id;
        string wsuId; 
        SecurityKeyIdentifier keyIdentifier;
        string mimeType; 
        EncryptionState state; 
        string type;
        SecurityTokenSerializer tokenSerializer; 

        protected EncryptedType()
        {
            this.encryptionMethod.Init(); 
            this.state = EncryptionState.New;
            this.tokenSerializer = SecurityStandardsManager.DefaultInstance.SecurityTokenSerializer; 
        } 

        public string Encoding 
        {
            get
            {
                return this.encoding; 
            }
            set 
            { 
                this.encoding = value;
            } 
        }

        public string EncryptionMethod
        { 
            get
            { 
                return this.encryptionMethod.algorithm; 
            }
            set 
            {
                this.encryptionMethod.algorithm = value;
            }
        } 

        public XmlDictionaryString EncryptionMethodDictionaryString 
        { 
            get
            { 
                return this.encryptionMethod.algorithmDictionaryString;
            }
            set
            { 
                this.encryptionMethod.algorithmDictionaryString = value;
            } 
        } 

        public bool HasId 
        {
            get
            {
                return true; 
            }
        } 
 
        public string Id
        { 
            get
            {
                return this.id;
            } 
            set
            { 
                this.id = value; 
            }
        } 

        public string WsuId
        {
            get 
            {
                return this.wsuId; 
            } 
            set
            { 
                this.wsuId = value;
            }
        }
 
        public SecurityKeyIdentifier KeyIdentifier
        { 
            get 
            {
                return this.keyIdentifier; 
            }
            set
            {
                this.keyIdentifier = value; 
            }
        } 
 
        public string MimeType
        { 
            get
            {
                return this.mimeType;
            } 
            set
            { 
                this.mimeType = value; 
            }
        } 

        public string Type
        {
            get 
            {
                return this.type; 
            } 
            set
            { 
                this.type = value;
            }
        }
 
        protected abstract XmlDictionaryString OpeningElementName
        { 
            get; 
        }
 
        protected EncryptionState State
        {
            get
            { 
                return this.state;
            } 
            set 
            {
                this.state = value; 
            }
        }

        public SecurityTokenSerializer SecurityTokenSerializer 
        {
            get 
            { 
                return this.tokenSerializer;
            } 
            set
            {
                this.tokenSerializer = value ?? WSSecurityTokenSerializer.DefaultInstance;
            } 
        }
 
        protected abstract void ForceEncryption(); 

        protected virtual void ReadAdditionalAttributes(XmlDictionaryReader reader) 
        {
        }

        protected virtual void ReadAdditionalElements(XmlDictionaryReader reader) 
        {
        } 
 
        protected abstract void ReadCipherData(XmlDictionaryReader reader);
        protected abstract void ReadCipherData(XmlDictionaryReader reader, long maxBufferSize); 

        public void ReadFrom(XmlReader reader)
        {
            ReadFrom(reader, 0); 
        }
 
        public void ReadFrom(XmlDictionaryReader reader) 
        {
            ReadFrom(reader, 0); 
        }

        public void ReadFrom(XmlReader reader, long maxBufferSize)
        { 
            ReadFrom(XmlDictionaryReader.CreateDictionaryReader(reader), maxBufferSize);
        } 
 
        public void ReadFrom(XmlDictionaryReader reader, long maxBufferSize)
        { 
            ValidateReadState();
            reader.MoveToStartElement(OpeningElementName, NamespaceUri);
            this.encoding = reader.GetAttribute(EncodingAttribute, null);
            this.id = reader.GetAttribute(XD.XmlEncryptionDictionary.Id, null) ?? SecurityUniqueId.Create().Value; 
            this.wsuId = reader.GetAttribute(XD.XmlEncryptionDictionary.Id, XD.UtilityDictionary.Namespace) ?? SecurityUniqueId.Create().Value;
            this.mimeType = reader.GetAttribute(MimeTypeAttribute, null); 
            this.type = reader.GetAttribute(TypeAttribute, null); 
            ReadAdditionalAttributes(reader);
            reader.Read(); 

            if (reader.IsStartElement(EncryptionMethodElement.ElementName, NamespaceUri))
            {
                this.encryptionMethod.ReadFrom(reader); 
            }
            if (this.tokenSerializer.CanReadKeyIdentifier(reader)) 
            { 
                this.KeyIdentifier = this.tokenSerializer.ReadKeyIdentifier(reader);
            } 

            reader.ReadStartElement(CipherDataElementName, EncryptedType.NamespaceUri);
            reader.ReadStartElement(CipherValueElementName, EncryptedType.NamespaceUri);
            if (maxBufferSize == 0) 
                ReadCipherData(reader);
            else 
                ReadCipherData(reader, maxBufferSize); 
            reader.ReadEndElement(); // CipherValue
            reader.ReadEndElement(); // CipherData 

            ReadAdditionalElements(reader);
            reader.ReadEndElement(); // OpeningElementName
            this.State = EncryptionState.Read; 
        }
 
        protected virtual void WriteAdditionalAttributes(XmlDictionaryWriter writer) 
        {
        } 

        protected virtual void WriteAdditionalElements(XmlDictionaryWriter writer)
        {
        } 

        protected abstract void WriteCipherData(XmlDictionaryWriter writer); 
 
        public void WriteTo(XmlDictionaryWriter writer, DictionaryManager dictionaryManager)
        { 
            if (writer == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer");
            } 
            ValidateWriteState();
            writer.WriteStartElement(XmlEncryptionStrings.Prefix, this.OpeningElementName, NamespaceUri); 
            if (this.id != null && this.id.Length != 0) 
            {
                writer.WriteAttributeString(XD.XmlEncryptionDictionary.Id, null, this.Id); 
            }
            if (this.type != null)
            {
                writer.WriteAttributeString(TypeAttribute, null, this.Type); 
            }
            if (this.mimeType != null) 
            { 
                writer.WriteAttributeString(MimeTypeAttribute, null, this.MimeType);
            } 
            if (this.encoding != null)
            {
                writer.WriteAttributeString(EncodingAttribute, null, this.Encoding);
            } 
            WriteAdditionalAttributes(writer);
            if (this.encryptionMethod.algorithm != null) 
            { 
                this.encryptionMethod.WriteTo(writer);
            } 
            if (this.KeyIdentifier != null)
            {
                this.tokenSerializer.WriteKeyIdentifier(writer, this.KeyIdentifier);
            } 

            writer.WriteStartElement(CipherDataElementName, NamespaceUri); 
            writer.WriteStartElement(CipherValueElementName, NamespaceUri); 
            WriteCipherData(writer);
            writer.WriteEndElement(); // CipherValue 
            writer.WriteEndElement(); // CipherData

            WriteAdditionalElements(writer);
            writer.WriteEndElement(); // OpeningElementName 
        }
 
        void ValidateReadState() 
        {
            if (this.State != EncryptionState.New) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.BadEncryptionState)));
            }
        } 

        void ValidateWriteState() 
        { 
            if (this.State == EncryptionState.EncryptionSetup)
            { 
                ForceEncryption();
            }
            else if (this.State == EncryptionState.New)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.BadEncryptionState)));
            } 
        } 

        protected enum EncryptionState 
        {
            New,
            Read,
            DecryptionSetup, 
            Decrypted,
            EncryptionSetup, 
            Encrypted 
        }
 
        struct EncryptionMethodElement
        {
            internal string algorithm;
            internal XmlDictionaryString algorithmDictionaryString; 
            internal static readonly XmlDictionaryString ElementName = XD.XmlEncryptionDictionary.EncryptionMethod;
 
            public void Init() 
            {
                this.algorithm = null; 
            }

            public void ReadFrom(XmlDictionaryReader reader)
            { 
                reader.MoveToStartElement(ElementName, XD.XmlEncryptionDictionary.Namespace);
                bool isEmptyElement = reader.IsEmptyElement; 
                this.algorithm = reader.GetAttribute(XD.XmlSignatureDictionary.Algorithm, null); 
                if (this.algorithm == null)
                { 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(
                        SR.GetString(SR.RequiredAttributeMissing, XD.XmlSignatureDictionary.Algorithm.Value, ElementName.Value)));
                }
                reader.Read(); 
                if (!isEmptyElement)
                { 
                    while (reader.IsStartElement()) 
                    {
                        reader.Skip(); 
                    }
                    reader.ReadEndElement();
                }
            } 

            public void WriteTo(XmlDictionaryWriter writer) 
            { 
                writer.WriteStartElement(XmlEncryptionStrings.Prefix, ElementName, XD.XmlEncryptionDictionary.Namespace);
                if (this.algorithmDictionaryString != null) 
                {
                    writer.WriteStartAttribute(XD.XmlSignatureDictionary.Algorithm, null);
                    writer.WriteString(this.algorithmDictionaryString);
                    writer.WriteEndAttribute(); 
                }
                else 
                { 
                    writer.WriteAttributeString(XD.XmlSignatureDictionary.Algorithm, null, this.algorithm);
                } 
                if (this.algorithm == XD.SecurityAlgorithmDictionary.RsaOaepKeyWrap.Value)
                {
                    writer.WriteStartElement(XmlSignatureStrings.Prefix, XD.XmlSignatureDictionary.DigestMethod, XD.XmlSignatureDictionary.Namespace);
                    writer.WriteStartAttribute(XD.XmlSignatureDictionary.Algorithm, null); 
                    writer.WriteString(XD.SecurityAlgorithmDictionary.Sha1Digest);
                    writer.WriteEndAttribute(); 
                    writer.WriteEndElement(); 
                }
                writer.WriteEndElement(); // EncryptionMethod 
            }
        }
    }
} 

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

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