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certaddencodedcertificatetostore (crypt32)
Creates a certificate context from an encoded certificate and adds it to the certificate store.

C# Signature:

[DllImport("CRYPT32.DLL", EntryPoint = "CertAddEncodedCertificateToStore", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool CertAddEncodedCertificateToStore(IntPtr certStore, int certEncodingType, byte[] certEncoded, int certEncodedLength, int addDisposition, IntPtr certContext);

VB Signature:

Declare Function CertAddEncodedCertificateToStore Lib "crypt32.dll" (TODO) As TODO

User-Defined Types:


Alternative Managed API:

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Sample Code:

IntPtr store = CertOpenSystemStore(0, CERT_STORE_NAME);

if(store != IntPtr.Zero) {
    FileStream ifs = new FileStream("MyTest.cer", FileMode.Open, FileAccess.Read);
    if(ifs != null) {
        byte[] cert = new byte[ifs.Length];

        for(int i = 0; i < ifs.Length; i++){
            cert[i] = (byte)ifs.ReadByte();

        if(CertAddEncodedCertificateToStore(store, X509_ASN_ENCODING, cert, cert.Length, CERT_STORE_ADD_REPLACE_EXISTING, IntPtr.Zero)) {
            MessageBox.Show("Certificate added");
        } else {
            MessageBox.Show("Could not add certificate");
    } else {
            MessageBox.Show("Could not open certificate file");

    CertCloseStore(store, 0);


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