Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / SafeRsaProviderHandle.cs / 1 / SafeRsaProviderHandle.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace Microsoft.InfoCards { using System; using System.ComponentModel; using System.Globalization; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Security; using Microsoft.InfoCards.Diagnostics; using IDT=Microsoft.InfoCards.Diagnostics.InfoCardTrace; // // Summary: // Provides a wrapper over a handle retrieved by CryptAcquireContext // internal class SafeRsaProviderHandle : SafeHandle { [DllImport( "advapi32.dll", EntryPoint ="CryptAcquireContextW", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true ) ] [SuppressUnmanagedCodeSecurity] private static extern bool CryptAcquireContext( [Out] out SafeRsaProviderHandle hProv, [In] string pszContainer, [In] string pszProvider, [In] uint dwProvType, [In] uint dwFlags ); [DllImport( "advapi32.dll", EntryPoint = "CryptReleaseContext", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true ) ] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [SuppressUnmanagedCodeSecurity] private static extern bool CryptReleaseContext( [In] IntPtr hProv, [In] uint dwFlags ); public static SafeRsaProviderHandle Construct() { // // The native provider we use to do encryption and decryption and associated constants to // set up the Microsoft Enhanced RSA and AES provider // const uint CRYPT_VERIFYCONTEXT = 0xF0000000; const byte PROV_RSA_AES = 24; // // We use a null provider and CRYPT_VERIFYCONTEXT as a flag // to force the use of ephemeral keys. See http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B238187 // for details. // SafeRsaProviderHandle h; if( !SafeRsaProviderHandle.CryptAcquireContext( out h, null, null, PROV_RSA_AES, CRYPT_VERIFYCONTEXT ) ) { Win32Exception e = new Win32Exception( Marshal.GetLastWin32Error() ); IDT.CloseInvalidOutSafeHandle(h); IDT.TraceAndLogException( e ); throw IDT.ThrowHelperError( new CommunicationException( e.Message ) ); } return h; } private SafeRsaProviderHandle() : base( IntPtr.Zero, true ) { } public override bool IsInvalid { get { return ( IntPtr.Zero == base.handle ); } } protected override bool ReleaseHandle() { #pragma warning suppress 56523 return CryptReleaseContext( base.handle, 0 ); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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