97 lines
2.3 KiB
C#
97 lines
2.3 KiB
C#
//
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// Mono.Security.Cryptography.CapiContext
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//
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// Authors:
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// Sebastien Pouliot (sebastien@ximian.com)
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//
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// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004 Novell (http://www.novell.com)
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//
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using System;
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using System.Security.Cryptography;
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namespace Mono.Security.Cryptography {
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// we deal with unmanaged resources - they MUST be released after use!
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public class CapiContext : IDisposable {
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// handles to CryptoAPI - they are
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private IntPtr providerHandle;
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private CspParameters cspParams;
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// has the last call succeded ?
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private bool lastResult;
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// Create an instance using the default CSP
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public CapiContext () : this (null)
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{
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}
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// Create an instance using the specified CSP
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public CapiContext (CspParameters csp)
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{
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providerHandle = IntPtr.Zero;
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if (csp == null) {
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// default parameters
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cspParams = new CspParameters ();
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}
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else {
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// keep of copy of the parameters
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cspParams = new CspParameters (csp.ProviderType, csp.ProviderName, csp.KeyContainerName);
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cspParams.KeyNumber = csp.KeyNumber;
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cspParams.Flags = csp.Flags;
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}
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// do not show user interface (CRYPT_SILENT) - if UI is required then the function fails.
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uint flags = CryptoAPI.CRYPT_SILENT;
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if ((cspParams.Flags & CspProviderFlags.UseMachineKeyStore) == CspProviderFlags.UseMachineKeyStore) {
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flags |= CryptoAPI.CRYPT_MACHINE_KEYSET;
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}
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lastResult = CryptoAPI.CryptAcquireContextA (ref providerHandle, cspParams.KeyContainerName,
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cspParams.ProviderName, cspParams.ProviderType, flags);
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if (!lastResult) {
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// key container may not exist
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flags |= CryptoAPI.CRYPT_NEWKEYSET;
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lastResult = CryptoAPI.CryptAcquireContextA (ref providerHandle, cspParams.KeyContainerName,
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cspParams.ProviderName, cspParams.ProviderType, flags);
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}
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}
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~CapiContext ()
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{
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Dispose ();
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}
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public int Error {
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get { return CryptoAPI.GetLastError (); }
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}
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public IntPtr Handle {
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get { return providerHandle; }
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}
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public bool Result {
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get { return lastResult; }
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}
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internal bool InternalResult {
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set { lastResult = value; }
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}
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// release unmanaged resources
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public void Dispose ()
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{
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if (providerHandle != IntPtr.Zero) {
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lastResult = CryptoAPI.CryptReleaseContext (providerHandle, 0);
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GC.KeepAlive (this);
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providerHandle = IntPtr.Zero;
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GC.SuppressFinalize (this);
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}
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}
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}
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}
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