(Node.js) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

    var rsa = new chilkat.Rsa();

    // Any string argument automatically begins the 30-day trial.
    var success = rsa.UnlockComponent("30-day trial");
    if (success !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Load the .pfx/.p12
    var pfx = new chilkat.Pfx();
    success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword");
    if (success !== true) {
        console.log(pfx.LastErrorText);
        return;
    }

    // Get the default private key.
    // privKey: PrivateKey
    var privKey = pfx.GetPrivateKey(0);
    if (pfx.LastMethodSuccess !== true) {
        console.log(pfx.LastErrorText);
        return;
    }

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success !== true) {
        console.log(rsa.LastErrorText);

        return;
    }

    // This example will sign a string, and receive the signature
    // in a base64-encoded string.  Therefore, set the encoding mode
    // to "base64":
    rsa.EncodingMode = "base64";

    // If some other non-Chilkat application or web service is going to be verifying
    // the signature, it is important to match the byte-ordering.
    // The LittleEndian property may be set to true
    // for little-endian byte ordering, 
    // or false  for big-endian byte ordering.
    // Microsoft apps typically use little-endian, while
    // OpenSSL and other services (such as Amazon CloudFront)
    // use big-endian.
    rsa.LittleEndian = false;

    var strData = "This is the string to be signed.";

    // Sign the string using the sha-256 hash algorithm.
    // Other valid choices are "sha-1", "md2" and "md5".
    var base64Sig = rsa.SignStringENC(strData,"sha-256");

    console.log(base64Sig);

    console.log("Success!");

}

chilkatExample();