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copied!<p>That function should work fine on 64-bit windows if you change your pointers to be the same size at the platform using <a href="http://msdn.microsoft.com/en-us/library/system.intptr.aspx" rel="nofollow"><code>IntPtr</code></a>. Your pointers are fixed at 32-bits, which may (most likely) cause problems in a 64-bit environments. For example:</p> <pre><code> Friend Declare Function CryptAcquireContext Lib "advapi32.dll" Alias "CryptAcquireContextA" (ByRef phProv As IntPtr, ByVal pszContainer As String, ByVal pszProvider As String, ByVal dwProvType As Integer, ByVal dwFlags As Integer) As IntPtr </code></pre> <p>And that's it. The <code>dwFlags</code> and <code>dwProvType</code> stay Integer because they are 32-bit regardless of platform (DWORD). You will have to fix <em>all</em> platform invoke calls to use <code>IntPtr</code>. For example, your call to <code>CryptReleaseContext</code> should also take an <code>IntPtr</code> as the first parameter rather than Integer.</p> <p>Alternatively, you can change your application to always target the x86 platform instead of Any CPU and just let WOW64 handle it. Then, no code changes are needed.</p> <p>If you can explain what you need this function for, there might be a more straight forward .NET implementation of what you are trying to do. For instance, if you are trying to work with x509 certificates, you may be more interested in the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.x509certificates.x509certificate2.aspx" rel="nofollow"><code>X509Certificate2</code></a> class.</p>

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