RsaSecurityToken.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Tokens / RsaSecurityToken.cs / 1305376 / RsaSecurityToken.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IdentityModel.Tokens 
{
    using System.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Runtime.InteropServices;
    using System.Security.Cryptography;
    using System.Runtime.CompilerServices;
 
    public class RsaSecurityToken : SecurityToken
    { 
        string id; 
        DateTime effectiveTime;
        ReadOnlyCollection rsaKey; 
        RSA rsa;
        CspKeyContainerInfo keyContainerInfo;
        GCHandle rsaHandle;
 
        public RsaSecurityToken(RSA rsa)
            : this(rsa, SecurityUniqueId.Create().Value) 
        { 
        }
 
        public RsaSecurityToken(RSA rsa, string id)
        {
            if (rsa == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("rsa"); 
            if (id == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("id"); 
            this.rsa = rsa; 
            this.id = id;
            this.effectiveTime = DateTime.UtcNow; 
            GC.SuppressFinalize(this);
        }

        // This is defense-in-depth. 
        // Rsa finalizer can throw and bring down the process if in finalizer context.
        // This internal ctor is used by SM's IssuedSecurityTokenProvider. 
        // If ownsRsa=true, this class will take ownership of the Rsa object and provides 
        // a reliable finalizing/disposing of Rsa object.  The GCHandle is used to ensure
        // order in finalizer sequence. 
        RsaSecurityToken(RSACryptoServiceProvider rsa, bool ownsRsa)
        {
            if (rsa == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("rsa"); 
            this.rsa = rsa;
            this.id = SecurityUniqueId.Create().Value; 
            this.effectiveTime = DateTime.UtcNow; 
            if (ownsRsa)
            { 
                // This also key pair generation.
                // This must be called before PersistKeyInCsp to avoid a handle to go out of scope.
                this.keyContainerInfo = rsa.CspKeyContainerInfo;
                // We will handle key file deletion 
                rsa.PersistKeyInCsp = true;
                this.rsaHandle = GCHandle.Alloc(rsa); 
            } 
            else
            { 
                GC.SuppressFinalize(this);
            }
        }
 
        ~RsaSecurityToken()
        { 
            Dispose(false); 
        }
 
        internal void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this); 
        }
 
        void Dispose(bool disposing) 
        {
            if (this.rsaHandle.IsAllocated) 
            {
                try
                {
                    // keyContainerInfo is a wrapper over a member of Rsa. 
                    // this is to be safe that rsa.Dispose won't clean up that member.
                    string keyContainerName = this.keyContainerInfo.KeyContainerName; 
                    string providerName = this.keyContainerInfo.ProviderName; 
                    uint providerType = (uint)this.keyContainerInfo.ProviderType;
 
                    ((IDisposable)this.rsa).Dispose();

                    // Best effort delete key file in user context
                    SafeProvHandle provHandle; 
                    if (!NativeMethods.CryptAcquireContextW(out provHandle,
                                                            keyContainerName, 
                                                            providerName, 
                                                            providerType,
                                                            NativeMethods.CRYPT_DELETEKEYSET)) 
                    {
                        int error = Marshal.GetLastWin32Error();
                        try
                        { 
                            throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                                new InvalidOperationException(SR.GetString(SR.FailedToDeleteKeyContainerFile), new Win32Exception(error))); 
                        } 
                        catch (InvalidOperationException ex)
                        { 
                            if (DiagnosticUtility.ShouldTraceWarning)
                            {
                                DiagnosticUtility.ExceptionUtility.TraceHandledException(ex, TraceEventType.Warning);
                            } 
                        }
                    } 
                    System.ServiceModel.Diagnostics.Utility.CloseInvalidOutSafeHandle(provHandle); 
                }
                finally 
                {
                    this.rsaHandle.Free();
                }
            } 
        }
 
        internal static RsaSecurityToken CreateSafeRsaSecurityToken(int keySize) 
        {
            RsaSecurityToken token; 
            RSACryptoServiceProvider rsa = null;

            RuntimeHelpers.PrepareConstrainedRegions();
            try 
            {
                try 
                { 
                }
                finally 
                {
                    rsa = new RSACryptoServiceProvider(keySize);
                }
                token = new RsaSecurityToken(rsa, true); 
                rsa = null;
            } 
            finally 
            {
                if (rsa != null) 
                {
                    ((IDisposable)rsa).Dispose();
                }
            } 
            return token;
        } 
 
        public override string Id
        { 
            get { return this.id; }
        }

        public override DateTime ValidFrom 
        {
            get { return this.effectiveTime; } 
        } 

        public override DateTime ValidTo 
        {
            // Never expire
            get { return SecurityUtils.MaxUtcDateTime; }
        } 

        public override ReadOnlyCollection SecurityKeys 
        { 
            get
            { 
                if (this.rsaKey == null)
                {
                    List keys = new List(1);
                    keys.Add(new RsaSecurityKey(this.rsa)); 
                    this.rsaKey = keys.AsReadOnly();
                } 
                return this.rsaKey; 
            }
        } 

        public RSA Rsa
        {
            get { return this.rsa; } 
        }
 
        public override bool CanCreateKeyIdentifierClause() 
        {
            return typeof(T) == typeof(RsaKeyIdentifierClause); 
        }

        public override T CreateKeyIdentifierClause()
        { 
            if (typeof(T) == typeof(RsaKeyIdentifierClause))
                return (T)((object)new RsaKeyIdentifierClause(this.rsa)); 
 
            throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(
                SR.GetString(SR.TokenDoesNotSupportKeyIdentifierClauseCreation, GetType().Name, typeof(T).Name))); 
        }

        public override bool MatchesKeyIdentifierClause(SecurityKeyIdentifierClause keyIdentifierClause)
        { 
            RsaKeyIdentifierClause rsaKeyIdentifierClause = keyIdentifierClause as RsaKeyIdentifierClause;
            if (rsaKeyIdentifierClause != null) 
                return rsaKeyIdentifierClause.Matches(this.rsa); 

            return false; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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RsaSecurityToken.cs source code in C# .NET

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