InfoCardSymmetricCrypto.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / infocard / Client / System / IdentityModel / Selectors / InfoCardSymmetricCrypto.cs / 1305376 / InfoCardSymmetricCrypto.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IdentityModel.Selectors
{ 
    using System;
    using System.ComponentModel; 
    using System.Runtime.InteropServices; 
    using System.Security.Cryptography;
    using System.Security.Cryptography.Xml; 
    using System.IdentityModel.Tokens;
    using System.Runtime.ConstrainedExecution;
    using System.Runtime.CompilerServices;
    using IDT=Microsoft.InfoCards.Diagnostics.InfoCardTrace; 

    // 
    // For common & resources 
    //
    using Microsoft.InfoCards; 

    //
    // Summary:
    //  This class implements the ISymmetricCrypto interface and is used as an adapter between the 
    //  InfoCard system and Indigo.
    // 
    internal class InfoCardSymmetricCrypto : SymmetricSecurityKey, IDisposable 
    {
        SymmetricCryptoHandle m_cryptoHandle; 
        RpcSymmetricCryptoParameters m_params;

        //
        // Summary: 
        //  Creates a new InfoCardSymmetricCrypto based on a SymmetricCryptoHandle
        // 
        // Parameters: 
        //  cryptoHandle  - A handle to the symmetric key on which to base this object.
        // 
        public InfoCardSymmetricCrypto( SymmetricCryptoHandle cryptoHandle )
            : base()
        {
            m_cryptoHandle = (SymmetricCryptoHandle)cryptoHandle.Duplicate(); 

            try 
            { 
                m_params = (RpcSymmetricCryptoParameters) m_cryptoHandle.Parameters;
            } 
            catch
            {
                if( null != m_cryptoHandle )
                { 
                    m_cryptoHandle.Dispose();
                    m_cryptoHandle = null; 
                } 
                throw;
            } 
        }

        // ICrypto
 
        public override int KeySize
        { 
            get { return m_params.keySize;} 
        }
 
        public override byte[] DecryptKey(string algorithmUri, byte[] keyData)
        {
            throw IDT.ThrowHelperError( new NotImplementedException() );
        } 

        public override byte[] EncryptKey(string algorithmUri, byte[] keyData) 
        { 
            throw IDT.ThrowHelperError( new NotImplementedException() );
        } 

        public override bool IsAsymmetricAlgorithm(string algorithmUri)
        {
            return InfoCardCryptoHelper.IsAsymmetricAlgorithm(algorithmUri); 
        }
 
        public override bool IsSupportedAlgorithm(string algorithmUri) 
        {
            switch (algorithmUri) 
            {
                case SecurityAlgorithms.Aes128Encryption:
                case SecurityAlgorithms.HmacSha1Signature:
                case SecurityAlgorithms.Psha1KeyDerivation: 
                case SecurityAlgorithms.Psha1KeyDerivationDec2005:
                    return true; 
                default: 
                    return false;
            } 
        }

        // why does this map to supported?
        public override bool IsSymmetricAlgorithm(string algorithmUri) 
        {
            return IsSupportedAlgorithm( algorithmUri ); 
        } 

        // ISymmetricCrypto 

        public override byte[] GenerateDerivedKey(string algorithmUri,
                                          byte[] label,
                                          byte[] nonce, 
                                          int    derivedKeyLength,
                                          int    offset) 
        { 
            IDT.DebugAssert( !String.IsNullOrEmpty( algorithmUri ), "null alg uri" );
            IDT.DebugAssert( null != label && 0 != label.Length, "null label" ); 
            IDT.DebugAssert( null != nonce && 0 != nonce.Length, "null nonce" );

            if( !IsSupportedAlgorithm( algorithmUri ) )
            { 
                throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) );
            } 
            byte[] derivedKey = null; 
            using( HGlobalSafeHandle pLabel = HGlobalSafeHandle.Construct( label.Length ) )
            { 
                using( HGlobalSafeHandle pNonce = HGlobalSafeHandle.Construct( nonce.Length ) )
                {

                    GlobalAllocSafeHandle pDerivedKey = null; 
                    int cbDerivedKey = 0;
 
                    Marshal.Copy( label, 0, pLabel.DangerousGetHandle(), label.Length ); 
                    Marshal.Copy( nonce, 0, pNonce.DangerousGetHandle(), nonce.Length );
 
                    int status = CardSpaceSelector.GetShim().m_csShimGenerateDerivedKey( m_cryptoHandle.InternalHandle,
                                                                   label.Length,
                                                                   pLabel,
                                                                   nonce.Length, 
                                                                   pNonce,
                                                                   derivedKeyLength, 
                                                                   offset, 
                                                                   algorithmUri,
                                                                   out cbDerivedKey, 
                                                                   out pDerivedKey );

                    if ( 0 != status )
                    { 
                        throw IDT.ThrowHelperError( new Win32Exception( status ) );
                    } 
                    pDerivedKey.Length = cbDerivedKey; 
                    derivedKey = new byte[ pDerivedKey.Length ];
                    using( pDerivedKey ) 
                    {
                        Marshal.Copy( pDerivedKey.DangerousGetHandle(), derivedKey, 0, pDerivedKey.Length );
                    }
 
                }
            } 
            return derivedKey; 
        }
 
        //
        // Summary:
        //  Returns an ICryptoTransform based on the algorithm and initialization vector passed in and the underlying
        //  CryptoHandle. 
        //
        // Parameters: 
        //  algorithmUri  - The algorithm that the transform you implement. 
        //  iv            - The initialization vector to use in the transform
        // 
        public override ICryptoTransform GetDecryptionTransform(string algorithmUri, byte[] iv)
        {
            ICryptoTransform transform;
 
            switch (algorithmUri)
            { 
                case SecurityAlgorithms.Aes128Encryption: 
                    using ( InfoCardSymmetricAlgorithm symAlgo = new InfoCardSymmetricAlgorithm( m_cryptoHandle ) )
                    { 
                        symAlgo.IV = iv;
                        transform = symAlgo.CreateDecryptor();
                    }
                    break; 
                default:
                    throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) ); 
            } 

            return transform; 
        }

        //
        // Summary: 
        //  Returns an ICryptoTransform based on the algorithm and initialization vector passed in and the underlying
        //  CryptoHandle. 
        // 
        // Parameters:
        //  algorithmUri  - The algorithm that the transform you implement. 
        //  iv            - The initialization vector to use in the transform
        //
        public override ICryptoTransform GetEncryptionTransform(string algorithmUri, byte[] iv)
        { 
            ICryptoTransform transform;
 
            switch (algorithmUri) 
            {
                case SecurityAlgorithms.Aes128Encryption: 
                    using ( InfoCardSymmetricAlgorithm symAlgo = new InfoCardSymmetricAlgorithm( m_cryptoHandle ) )
                    {
                        symAlgo.IV = iv;
                        transform = symAlgo.CreateEncryptor(); 
                    }
                    break; 
                default: 
                    throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) );
            } 

            return transform;
        }
 
        //
        // Summary: 
        //  Returns the size of the initialization vector for the underlying crypto algorithm. 
        //
        public override int GetIVSize(string algorithmUri) 
        {
            int size;

            switch (algorithmUri) 
            {
                case SecurityAlgorithms.Aes128Encryption: 
                    RpcSymmetricCryptoParameters param = (RpcSymmetricCryptoParameters) m_cryptoHandle.Parameters; 
                    size = param.blockSize;
                    break; 
                default:
                    throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) );
            }
 
            return size;
        } 
 
        //
        // Summary: 
        //  Returns a KeyedHashAlgorithm based on the underlying crypto handle and the algorithm passed in.
        //
        public override KeyedHashAlgorithm GetKeyedHashAlgorithm(string algorithmUri)
        { 
            switch (algorithmUri)
            { 
                case SecurityAlgorithms.HmacSha1Signature: 
                    return new InfoCardKeyedHashAlgorithm( m_cryptoHandle );
                default: 
                    throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) );
            }
        }
 
        //
        // Summary: 
        //  Returns a SymmetricAlgorithm based on the underlying crypto handle and the algorithm passed in. 
        //
        public override SymmetricAlgorithm GetSymmetricAlgorithm(string algorithmUri) 
        {
            SymmetricAlgorithm algorithm;
            switch (algorithmUri)
            { 
                case SecurityAlgorithms.Aes128Encryption:
                    algorithm = new InfoCardSymmetricAlgorithm( m_cryptoHandle ); 
                    break; 
                default:
                    throw IDT.ThrowHelperError( new NotSupportedException( SR.GetString( SR.ClientUnsupportedCryptoAlgorithm, algorithmUri ) ) ); 
            }

            return algorithm;
        } 

        public override byte[] GetSymmetricKey() 
        { 
            throw IDT.ThrowHelperError( new NotImplementedException() );
        } 

        //
        // IDisposable
        // 
        public void Dispose()
        { 
            if( null != m_cryptoHandle ) 
            {
                m_cryptoHandle.Dispose(); 
                m_cryptoHandle = null;
            }
        }
    } 
}

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