(Node.js) Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var pkey = new chilkat.PrivateKey();

    // Load the private key from an RSA PEM file:
    var success = pkey.LoadPemFile("pvkey2_rsa.pem");

    var pkeyXml;
    // Get the private key in XML format:
    pkeyXml = pkey.GetXml();

    var rsa = new chilkat.Rsa();

    // Import the private key into the RSA object:
    success = rsa.ImportPrivateKey(pkeyXml);
    if (success !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Get the signature as hex.
    rsa.EncodingMode = "hex";

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

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "md5", "sha256",
    // "sha384", and "sha512".
    var hexSig = rsa.SignStringENC(strData,"sha-1");

    console.log(hexSig);

    console.log("Success!");

}

chilkatExample();