RsaKeyIdentifierClause.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

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

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

namespace System.IdentityModel.Tokens 
{
    using System.Globalization; 
    using System.Security.Cryptography; 
    using System.Xml;
 
    public class RsaKeyIdentifierClause : SecurityKeyIdentifierClause
    {
        static string clauseType = XmlSignatureStrings.Namespace + XmlSignatureStrings.RsaKeyValue;
        readonly RSA rsa; 
        readonly RSAParameters rsaParameters;
        RsaSecurityKey rsaSecurityKey; 
 
        public RsaKeyIdentifierClause(RSA rsa)
            : base(clauseType) 
        {
            if (rsa == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("rsa");
 
            this.rsa = rsa;
            this.rsaParameters = rsa.ExportParameters(false); 
        } 

        public override bool CanCreateKey 
        {
            get { return true; }
        }
 
        public RSA Rsa
        { 
            get { return this.rsa; } 
        }
 
        public override SecurityKey CreateKey()
        {
            if (this.rsaSecurityKey == null)
            { 
                this.rsaSecurityKey = new RsaSecurityKey(this.rsa);
            } 
            return this.rsaSecurityKey; 
        }
 
        public byte[] GetExponent()
        {
            return SecurityUtils.CloneBuffer(this.rsaParameters.Exponent);
        } 

        public byte[] GetModulus() 
        { 
            return SecurityUtils.CloneBuffer(this.rsaParameters.Modulus);
        } 

        public override bool Matches(SecurityKeyIdentifierClause keyIdentifierClause)
        {
            RsaKeyIdentifierClause that = keyIdentifierClause as RsaKeyIdentifierClause; 

            // PreSharp Bug: Parameter 'that' to this public method must be validated: A null-dereference can occur here. 
            #pragma warning suppress 56506 
            return ReferenceEquals(this, that) || (that != null && that.Matches(this.rsa));
        } 

        public bool Matches(RSA rsa)
        {
            if (rsa == null) 
                return false;
 
            RSAParameters rsaParameters = rsa.ExportParameters(false); 
            return SecurityUtils.MatchesBuffer(this.rsaParameters.Modulus, rsaParameters.Modulus) &&
                SecurityUtils.MatchesBuffer(this.rsaParameters.Exponent, rsaParameters.Exponent); 
        }

        public override string ToString()
        { 
            return string.Format(CultureInfo.InvariantCulture, "RsaKeyIdentifierClause(Modulus = {0}, Exponent = {1})",
                Convert.ToBase64String(this.rsaParameters.Modulus), 
                Convert.ToBase64String(this.rsaParameters.Exponent)); 
        }
 
        public void WriteExponentAsBase64(XmlWriter writer)
        {
            if (writer == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer");
            } 
            writer.WriteBase64(this.rsaParameters.Exponent, 0, this.rsaParameters.Exponent.Length); 
        }
 
        public void WriteModulusAsBase64(XmlWriter writer)
        {
            if (writer == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer");
            } 
            writer.WriteBase64(this.rsaParameters.Modulus, 0, this.rsaParameters.Modulus.Length); 
        }
    } 
}

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

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