RemoteCryptoRsaServiceProvider.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / RemoteCryptoRsaServiceProvider.cs / 1 / RemoteCryptoRsaServiceProvider.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace Microsoft.InfoCards
{ 
    using System;
    using System.IO; 
 
    using System.Security;
    using System.Security.Cryptography; 


    using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace;
 
    //
    // Summary: 
    //  Encrypt request for RpcCrypto 
    //
    internal sealed class RemoteCryptoRsaServiceProvider : RSA, ICspAsymmetricAlgorithm 
    {
        const int CRYPT_OAEP = 0x40;

        X509CertificateTokenFactoryCredential   m_credential; 
        RpcCryptoContext                        m_context;
        CspKeyContainerInfo                     m_cspInfo; 
        UIAgentRequest                          m_request; 
        object                                  m_sync  = new object();
        bool                                    m_disposed = false; 

        public RemoteCryptoRsaServiceProvider( X509CertificateTokenFactoryCredential credential, UIAgentRequest request )
        {
            m_credential = credential; 
            m_context = new RpcCryptoContext(
                                    m_credential.PortName, 
                                    m_credential.ContextKey ); 

            CspParameters p = new CspParameters(); 
            p.KeyContainerName = "RpcCrypto";
            p.ProviderName = "RpcCrypto";
            p.ProviderType = 0;
            p.KeyNumber = (int)KeyNumber.Exchange; 
            m_cspInfo = new CspKeyContainerInfo( p );
            m_request = request; 
        } 

        // 
        // Summary:
        //  returns the KeyInfo for the current keys.
        //
        CspKeyContainerInfo ICspAsymmetricAlgorithm.CspKeyContainerInfo 
        {
            get 
            { 
                return m_cspInfo;
            } 
        }

        //
        // Summary: 
        //  Exports the public key info to a CspBlob
        // 
        // Arguments: 
        //  includePrivateParameters:   must be false
        // 
        // Returns:
        //  the new CspBlob
        //
        byte[] ICspAsymmetricAlgorithm.ExportCspBlob(bool includePrivateParameters) 
        {
            ICspAsymmetricAlgorithm alg = m_credential.Certificate.PublicKey.Key as ICspAsymmetricAlgorithm; 
            if( null == alg ) 
            {
                throw IDT.ThrowHelperError( new NotSupportedException() ); 
            }

            if( includePrivateParameters )
            { 
                throw IDT.ThrowHelperError( new NotSupportedException() );
            } 
            return alg.ExportCspBlob( false ); 
        }
 
        //
        // Summary:
        //  Import is not supported.
        // 
        void ICspAsymmetricAlgorithm.ImportCspBlob(byte[] rawData)
        { 
            throw IDT.ThrowHelperError( new NotSupportedException() ); 
        }
 


        //
        // Summary: 
        //  Returns the KeyExchangeAlg
        // 
        public override string KeyExchangeAlgorithm 
        {
            get 
            {
                if( null != m_credential &&
                    null != m_credential.Certificate &&
                    null != m_credential.Certificate.PublicKey && 
                    null != m_credential.Certificate.PublicKey.Key )
                { 
                    return m_credential.Certificate.PublicKey.Key.KeyExchangeAlgorithm; 
                }
                return null; 
            }
        }

        // 
        // Summary:
        //  Returns the SignatureAlgorithm 
        // 
        public override string SignatureAlgorithm
        { 
            get
            {
                if( null != m_credential &&
                    null != m_credential.Certificate && 
                    null != m_credential.Certificate.PublicKey &&
                    null != m_credential.Certificate.PublicKey.Key ) 
                { 
                    return m_credential.Certificate.PublicKey.Key.SignatureAlgorithm;
                } 
                return null;
            }
        }
 
        //
        // Summary: 
        //  Returns the key size. 
        //
        public override int KeySize 
        {
            get
            {
                if( null != m_credential && 
                    null != m_credential.Certificate &&
                    null != m_credential.Certificate.PublicKey && 
                    null != m_credential.Certificate.PublicKey.Key ) 
                {
                    return m_credential.Certificate.PublicKey.Key.KeySize; 
                }
                return 0;
            }
 
            set { throw IDT.ThrowHelperError( new NotSupportedException() ); }
        } 
 
        //
        // Summary: 
        //  Returns the legal key sizes.
        //
        public override KeySizes[] LegalKeySizes
        { 
            get
            { 
                return new KeySizes[] { new KeySizes(KeySize, KeySize, 0) }; 
            }
        } 

        //
        // Summary:
        //  Signs the provided hash 
        //
        // Arguments: 
        //  hashAlg:    the ALG_ID of the hash 
        //  hash:       the hash to verify.
        // 
        // Returns:
        //  the new signature.
        //
        public byte[] SignHash( int hashAlg, byte[] hash ) 
        {
            ThrowIfRemoteProcessDied(); 
            RemoteCryptoSignHashRequest req = new RemoteCryptoSignHashRequest( 
                                                        GetContext(),
                                                        hashAlg, 
                                                        0,
                                                        hash );
            req.Process();
 
            byte[] signature = req.GetSignature();
            ThrowIfRemoteProcessDied(); 
            return signature; 
        }
 
        //
        // Summary:
        //  Decrypts the specified
        // 
        // Arguments:
        //  rgb:        data to decrypt 
        // 
        // Returns:
        //  returns the clear text value. 
        //
        public override byte[] DecryptValue(byte[] rgb)
        {
            ThrowIfRemoteProcessDied(); 
            byte[] localBuffer = new byte[ rgb.Length ];
            Array.Copy( rgb, 0, localBuffer, 0, rgb.Length ); 
            RemoteCryptoDecryptRequest req = new RemoteCryptoDecryptRequest( 
                                                            GetContext(),
                                                            0, 
                                                            true,
                                                            localBuffer,
                                                            0,
                                                            localBuffer.Length, 
                                                            0,
                                                            null ); 
            req.Process(); 
            byte[] returnbuffer = new byte[ req.Length ];
            Array.Copy( req.GetBuffer(), req.Index, returnbuffer, 0, req.Length ); 
            ThrowIfRemoteProcessDied();
            return returnbuffer;
        }
 
        //
        // Summary: 
        //  Encrypts the specified 
        //
        // Arguments: 
        //  rgb:        data to encrypt
        //
        // Returns:
        //  returns the encrypted text value. 
        //
        public override byte[] EncryptValue(byte[] rgb) 
        { 
            return ((RSA)m_credential.Certificate.PublicKey.Key).EncryptValue(rgb);
        } 


        //
        // Summary: 
        //  Exports the public key info as RSAParameters
        // 
        // Arguments: 
        //  includePrivateParameters:   must be false;
        // 
        // Returns:
        //  The RSAParameters for the public key.
        //
        public override RSAParameters ExportParameters(bool includePrivateParameters) 
        {
            if( includePrivateParameters || null == m_credential.Certificate.PublicKey ) 
            { 
                throw IDT.ThrowHelperError( new CryptographicException( SR.GetString( SR.ServiceCanNotExportCertIdentityPrivateKey ) ) );
            } 

            if( m_credential.Certificate.PublicKey.Key is RSA )
            {
                return ((RSA)m_credential.Certificate.PublicKey.Key).ExportParameters(false); 
            }
 
            throw IDT.ThrowHelperError( new CryptographicException( SR.GetString( SR.ServiceCanNotExportCertIdentityPrivateKey ) ) ); 
        }
 



        // 
        // Summary:
        // 
        // 
        public override void ImportParameters(RSAParameters parameters)
        { 
            throw IDT.ThrowHelperError( new NotSupportedException() );
        }

 

 
        protected override void Dispose( bool disposing ) 
        {
            if ( m_disposed ) 
            {
                return;
            }
 
            lock( m_sync )
            { 
                if( m_disposed ) 
                {
                    return; 
                }

                try
                { 
                    if( disposing )
                    { 
                       // 
                       // Dispose managed resources
                       // 
                    }

                    //
                    // Dispose unmanaged resources 
                    //
 
                    // 
                    // Tear down the context.
                    // 
                    (( IDisposable )m_context).Dispose();

                    m_disposed = true;
                } 
                finally
                { 
                    ; 
                }
            } 
        }


        RpcCryptoContext GetContext() 
        {
            if( !m_context.IsOpen ) 
            { 
                m_context.Open();
            } 
            return m_context;
        }
        private void ThrowIfRemoteProcessDied()
        { 
            //
            // If the UIAgent has died then we no longer can be certain who we are talking to.  Crypto operations 
            // should no longer be trusted.  Before the UIAgent has died we were given the random name of then endpoint 
            // by the UIAgent so we can be certain that we are talking directly to the right process.
            // 
            if( !m_request.ParentRequest.UIAgentActive )
            {
                throw IDT.ThrowHelperError( new CryptographicException( SR.GetString( SR.RemoteCryptoSessionUnavailable ) ) );
            } 
        }
    } 
} 

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