SafeCryptoHandles.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 / clr / src / BCL / System / Security / Cryptography / SafeCryptoHandles.cs / 1305376 / SafeCryptoHandles.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// SafeCryptoHandles.cs 
//

namespace System.Security.Cryptography {
    using System.Runtime.InteropServices; 
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution; 
    using System.Runtime.Versioning; 
    using Microsoft.Win32.SafeHandles;
 
    /// 
    ///     Safe handle representing a mscorwks!CRYPT_PROV_CTX
    /// 
    ///  
    ///     Since we need sometimes to delete the key container created in the context of the CSP, the handle
    ///     used in this class is actually a pointer to a CRYPT_PROV_CTX unmanaged structure defined in 
    ///     COMCryptography.h 
    /// 
    [System.Security.SecurityCritical]  // auto-generated 
    internal sealed class SafeProvHandle : SafeHandleZeroOrMinusOneIsInvalid {

        private SafeProvHandle() : base(true) {
            SetHandle(IntPtr.Zero); 
        }
 
        private SafeProvHandle(IntPtr handle) : base (true) { 
            SetHandle(handle);
        } 

        internal static SafeProvHandle InvalidHandle {
            get { return new SafeProvHandle(); }
        } 

        [DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)] 
        [ResourceExposure(ResourceScope.None)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [SuppressUnmanagedCodeSecurity] 
        private static extern void FreeCsp(IntPtr pProviderContext);

        [System.Security.SecurityCritical]
        protected override bool ReleaseHandle() 
        {
            FreeCsp(handle); 
            return true; 
        }
    } 

#if FEATURE_CRYPTO
    /// 
    ///     Safe handle representing a mscorkws!CRYPT_KEY_CTX 
    /// 
    ///  
    ///     Since we need to delete the key handle before the provider is released we need to actually hold a 
    ///     pointer to a CRYPT_KEY_CTX unmanaged structure whose destructor decrements a refCount. Only when
    ///     the provider refCount is 0 it is deleted. This way, we loose a ---- in the critical finalization 
    ///     of the key handle and provider handle. This also applies to hash handles, which point to a
    ///     CRYPT_HASH_CTX. Those strucutres are defined in COMCryptography.h
    /// 
    [System.Security.SecurityCritical]  // auto-generated 
    internal sealed class SafeKeyHandle : SafeHandleZeroOrMinusOneIsInvalid {
 
        private SafeKeyHandle() : base(true) { 
            SetHandle(IntPtr.Zero);
        } 

        private SafeKeyHandle(IntPtr handle) : base (true) {
            SetHandle(handle);
        } 

        internal static SafeKeyHandle InvalidHandle { 
            get { return new SafeKeyHandle(); } 
        }
 
        [DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [ResourceExposure(ResourceScope.None)]
        [SuppressUnmanagedCodeSecurity] 
        private static extern void FreeKey(IntPtr pKeyCotext);
 
        [System.Security.SecurityCritical] 
        protected override bool ReleaseHandle()
        { 
            FreeKey(handle);
            return true;
        }
    } 

    ///  
    ///     SafeHandle representing a mscorwks!CRYPT_HASH_CTX 
    /// 
    ///  
    ///     See code:System.Security.Cryptography.SafeKeyHandle for information about the release process
    ///     for a CRYPT_HASH_CTX.
    /// 
    [System.Security.SecurityCritical]  // auto-generated 
    internal sealed class SafeHashHandle : SafeHandleZeroOrMinusOneIsInvalid {
 
        private SafeHashHandle() : base(true) { 
            SetHandle(IntPtr.Zero);
        } 

        private SafeHashHandle(IntPtr handle) : base (true) {
            SetHandle(handle);
        } 

        internal static SafeHashHandle InvalidHandle { 
            get { return new SafeHashHandle(); } 
        }
 
        [DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [ResourceExposure(ResourceScope.None)]
        [SuppressUnmanagedCodeSecurity] 
        private static extern void FreeHash(IntPtr pHashContext);
 
        [System.Security.SecurityCritical] 
        protected override bool ReleaseHandle()
        { 
            FreeHash(handle);
            return true;
        }
    } 
#endif // #if FEATURE_CRYPTO
} 
 

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

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