(JavaScript) RSA Sign String using Private Key of Certificate Type A3 (smart card / token)

Demonstrates RSA signing a string using the private key of a certificate type A3 (smart card, token).

Note: This is a Windows-only example.

Note: This example requires Chilkat v10.1.2 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// First get the A3 certificate that was installed on the Windows system.
var certStore = new CkCertStore();

var thumbprint = "12c1dd8015f3f03f7b1fa619dc24e2493ca8b4b2";

// This is specific to Windows because it is opening the Windows Current-User certificate store.
var bReadOnly = true;
success = certStore.OpenCurrentUserStore(bReadOnly);
if (success !== true) {
    console.log(certStore.LastErrorText);
    return;
}

// Find the certificate with the desired thumbprint
// (There are many ways to locate a certificate.  This example chooses to find by thumbprint.)
var json = new CkJsonObject();
json.UpdateString("thumbprint",thumbprint);

var cert = new CkCert();
success = certStore.FindCert(json,cert);
if (success == false) {
    console.log("Failed to find the certificate.");
    return;
}

console.log("Found: " + cert.SubjectCN);

var rsa = new CkRsa();

// Provide the cert's private key
var bUsePrivateKey = true;
success = rsa.SetX509Cert(cert,bUsePrivateKey);
if (success !== true) {
    console.log(rsa.LastErrorText);
    return;
}

// Return the RSA signature in base64 encoded form.
rsa.EncodingMode = "base64";

// Sign the utf-8 byte representation of the string.
rsa.Charset = "utf-8";

// You can also choose other hash algorithms, such as SHA-1.
var sigBase64 = rsa.SignStringENC("text to sign","SHA-256");
if (rsa.LastMethodSuccess !== true) {
    console.log(rsa.LastErrorText);
    return;
}

console.log("Base64 signature: " + sigBase64);