(Node.js) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

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

    var privkey = new chilkat.PrivateKey();

    // Load the private key object from a PEM file.
    // (To load from a PEM string, call LoadPem instead.)
    var success = privkey.LoadPemFile("somePath/myPrivateKey.pem");
    if (success !== true) {
        console.log(privkey.LastErrorText);
        return;
    }

    var rsa = new chilkat.Rsa();
    // Use RSA-PSS by setting OaepPadding = true
    rsa.OaepPadding = true;
    // Use SHA256
    rsa.OaepHash = "SHA-256";

    rsa.ImportPrivateKeyObj(privkey);

    // Generate a base64 signature.
    rsa.EncodingMode = "base64";

    var sigStr = rsa.SignStringENC("String to be signed","SHA-256");
    if (rsa.LastMethodSuccess !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    console.log("Signature: " + sigStr);

}

chilkatExample();