(Node.js) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

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-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var privKey = new chilkat.PrivateKey();
    var success;

    var sbPem = new chilkat.StringBuilder();
    sbPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",true);
    sbPem.AppendLine("MIIC .... j5A==",true);
    sbPem.AppendLine("-----END RSA PRIVATE KEY-----",true);

    success = privKey.LoadPem(sbPem.GetAsString());
    if (success !== true) {
        console.log(privKey.LastErrorText);
        return;
    }

    var rsa = new chilkat.Rsa();

    success = rsa.ImportPrivateKeyObj(privKey);
    if (success !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    rsa.EncodingMode = "base64";
    var strSigned = rsa.OpenSslSignStringENC("12345678");
    console.log(strSigned);

    var strOriginal = rsa.OpenSslVerifyStringENC(strSigned);
    console.log(strOriginal);

}

chilkatExample();