@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Finds the first or next certificate context in a certificate store that matches a search criteria established by the dwFindType and its associated pvFindPara. !!!!C# Signature: [DllImport("crypt32.dll", SetLastError=true)] static extern IntPtr CertFindCertificateInStore(IntPtr hCertStore, uint dwCertEncodingType, uint dwFindFlags, uint dwFindType, IntPtr pszFindPara, IntPtr pPrevCertCntxt); !!!!VB .NET Signature: Declare Function CertFindCertificateInStore Lib "crypt32.dll" ( _ hCertStore As IntPtr, dwCertEncodingType As Integer, dwFindFlags As Integer, _ dwFindType As Integer, pszFindPara As IntPtr, pPrevCertContext As IntPtr) As IntPtr !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: You can define overloads with pszFindPara defined as different types (such as string) to more easily handle different scenarios. !!!!Sample Code: public class Simplecert { const string MY = "MY"; const string OTHERS = "AddressBook"; const uint PKCS_7_ASN_ENCODING = 0x00010000; const uint X509_ASN_ENCODING = 0x00000001; const uint CERT_FIND_SUBJECT_STR = 0x00080007; static uint MY_ENCODING_TYPE = PKCS_7_ASN_ENCODING | X509_ASN_ENCODING ; static string lpszCertSubject = "*" ; public static void Main() { IntPtr hSysStore = IntPtr.Zero; IntPtr hCertCntxt = IntPtr.Zero; hSysStore = WinCapi.CertOpenSystemStore(IntPtr.Zero, MY) ; Console.WriteLine("Store Handle:\t0x{0:X}", hSysStore.ToInt32()); if(hSysStore != IntPtr.Zero) { hCertCntxt=WinCapi.CertFindCertificateInStore( hSysStore, MY_ENCODING_TYPE, 0, CERT_FIND_SUBJECT_STR, lpszCertSubject , IntPtr.Zero) ; if(hCertCntxt != IntPtr.Zero) { //use certcontext from managed code Console.WriteLine("CertContext:\t0x{0:X}", hCertCntxt.ToInt32()) ; X509Certificate foundcert = new X509Certificate(hCertCntxt); Console.WriteLine("\nFound certificate with SubjectName string \"{0}\"",lpszCertSubject); Console.WriteLine("SubjectName:\t{0}", foundcert.GetName()); Console.WriteLine("Serial No:\t{0}", foundcert.GetSerialNumberString()); Console.WriteLine("HashString:\t{0}" , foundcert.GetCertHashString()); } else Console.WriteLine("Could not find SubjectName containing string \"{0}\"", lpszCertSubject); } //------- Clean Up ----------- if(hCertCntxt != IntPtr.Zero) WinCapi.CertFreeCertificateContext(hCertCntxt); if(hSysStore != IntPtr.Zero) WinCapi.CertCloseStore(hSysStore, 0) ; } } !!!!Alternative Managed API: In the Web Services Development Kit (WSDK) Technology Preview and .NET Whidbey. Documentation: CertFindCertificateInStore@msdn on MSDN
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