test-encrypt.js

const forge = require('node-forge');
const { pki, md, util } = forge;
const { rsa } = pki;

function encryptByForge(message, publicKey) {
    // const buffer = util.createBuffer(message, "utf8"); // FIX THIS
    const buffer = Buffer.from(message, "utf-8");
    const encrypted = publicKey.encrypt(buffer, "RSA-OAEP", {
        md: md.sha256.create(),
        mgf1: {
            md: md.sha1.create()
        }
    });
    return util.encode64(encrypted);
};


function decryptByForge(ciphertextReceivedBase64, privateKey) {
    const buffer = Buffer.from(ciphertextReceivedBase64, 'base64');
    const decrypted = privateKey.decrypt(buffer, "RSA-OAEP", {
        md: md.sha256.create(),
        mgf1: {
            md: md.sha1.create()
        }
    });
    return decrypted.toString('utf-8');
};

const keyPair = rsa.generateKeyPair(2048);
const srcText = "The quick brown fox jumps over the lazy dog";
let encText = encryptByForge(srcText, keyPair.publicKey);
console.log(`enc-text: ${encText}`);
let decText = decryptByForge(encText, keyPair.privateKey);
console.log(`dec-text: ${decText}`);