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[DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError=true)]
static extern bool CredMarshalCredential(int credType,
// we need to get this as a pointer because we'll have
// to release it later on calling CredFree().
out IntPtr marshaledCredential);
Declare Function CredMarshalCredential Lib "advapi32.dll" (TODO) As TODO
internal struct CERT_CREDENTIAL_INFO
public uint cbSize;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public byte rgbHashOfCert;
internal static int CertCredential = 1;
Alternative Managed API:
Do you know one? Please contribute it!
Tips & Tricks:
One needs to free the string returned in the "out IntPtr marshaledCredential" parameter!
NativeMethods.CERT_CREDENTIAL_INFO certInfo =
certInfo.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.CERT_CREDENTIAL_INFO));
// certCredential.Certificate is an instance of the X509Certificate2 class.
certInfo.rgbHashOfCert = certCredential.Certificate.GetCertHash();
IntPtr marshaledCredential = IntPtr.Zero;
bool result =
// we need to do this here, before we free marshaledCredential
domainName = String.Empty;
userName = Marshal.PtrToStringUni(marshaledCredential);
password = certCredential.CardPin;
if (marshaledCredential != IntPtr.Zero)
The LogonUser function attempts to log a user on to the local computer. The local computer is the computer from which LogonUser was called. You cannot use LogonUser to log on to a remote computer.
4/17/2019 3:47:25 PM - 184.108.40.206
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-220.127.116.11
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