SafeCryptHandles.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 / SafeCryptHandles.cs / 1305376 / SafeCryptHandles.cs
                        

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

namespace System.IdentityModel 
{
    using System.ComponentModel; 
    using System.Runtime.InteropServices; 
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution; 
    using System.Security.Cryptography;
    using System.ServiceModel.Diagnostics;
    using Microsoft.Win32.SafeHandles;
 
    class SafeProvHandle : SafeHandleZeroOrMinusOneIsInvalid
    { 
        SafeProvHandle() : base(true) { } 

        // 0 is an Invalid Handle 
        SafeProvHandle(IntPtr handle)
            : base(true)
        {
            DiagnosticUtility.DebugAssert(handle == IntPtr.Zero, "SafeProvHandle constructor can only be called with IntPtr.Zero."); 
            SetHandle(handle);
        } 
 
        internal static SafeProvHandle InvalidHandle
        { 
            get { return new SafeProvHandle(IntPtr.Zero); }
        }

        protected override bool ReleaseHandle() 
        {
            // PreSharp Bug: Call 'Marshal.GetLastWin32Error' or 'Marshal.GetHRForLastWin32Error' before any other interop call. 
#pragma warning suppress 56523 // We are not interested in throwing an exception here if CloseHandle fails. 
            return NativeMethods.CryptReleaseContext(handle, 0);
        } 
    }

    class SafeKeyHandle : SafeHandleZeroOrMinusOneIsInvalid
    { 
        SafeProvHandle provHandle = null;
 
        SafeKeyHandle() : base(true) { } 

        // 0 is an Invalid Handle 
        SafeKeyHandle(IntPtr handle)
            : base(true)
        {
            DiagnosticUtility.DebugAssert(handle == IntPtr.Zero, "SafeKeyHandle constructor can only be called with IntPtr.Zero."); 
            SetHandle(handle);
        } 
 
        internal static SafeKeyHandle InvalidHandle
        { 
            get { return new SafeKeyHandle(IntPtr.Zero); }
        }

        protected override bool ReleaseHandle() 
        {
            // PreSharp Bug: Call 'Marshal.GetLastWin32Error' or 'Marshal.GetHRForLastWin32Error' before any other interop call. 
#pragma warning suppress 56523 // We are not interested in throwing an exception here if CloseHandle fails. 
            bool ret = NativeMethods.CryptDestroyKey(handle);
            if (this.provHandle != null) 
            {
                this.provHandle.DangerousRelease();
                this.provHandle = null;
            } 
            return ret;
        } 
 
        internal static unsafe SafeKeyHandle SafeCryptImportKey(SafeProvHandle provHandle, void* pbDataPtr, int cbData)
        { 
            bool b = false;
            int err = 0;
            SafeKeyHandle keyHandle = null;
            RuntimeHelpers.PrepareConstrainedRegions(); 
            try
            { 
                provHandle.DangerousAddRef(ref b); 
            }
            catch (Exception e) 
            {
                if (b)
                {
                    provHandle.DangerousRelease(); 
                    b = false;
                } 
                if (!(e is ObjectDisposedException)) 
                    throw;
            } 
            finally
            {
                if (b)
                { 
                    b = NativeMethods.CryptImportKey(provHandle, pbDataPtr, (uint)cbData, IntPtr.Zero, 0, out keyHandle);
                    if (!b) 
                    { 
                        err = Marshal.GetLastWin32Error();
                        provHandle.DangerousRelease(); 
                    }
                    else
                    {
                        // Take ownership of AddRef.  Will Release at Close. 
                        keyHandle.provHandle = provHandle;
                    } 
                } 
            }
 
            if (!b)
            {
                Utility.CloseInvalidOutSafeHandle(keyHandle);
                string reason = (err != 0) ? new Win32Exception(err).Message : String.Empty; 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CryptographicException(SR.GetString(SR.AESCryptImportKeyFailed, reason)));
            } 
            return keyHandle; 
        }
    } 
}

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

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