We use the crypto standard library for generating the keys:
const crypto = require("crypto");
// generate publickey and private key
const { publicKey, privateKey } = crypto.generateKeyPairSync("rsa", { // The standard secure default length for RSA keys is 2048 bits modulusLength: 2048, });
// The publicKey and privateKey variables will be used for encryption and decryption respectively
// This is the data we want to encrypt
const data = "my secret data";
const encryptedData = crypto.publicEncrypt( { key: publicKey, padding: crypto.constants.RSA_PKCS1_OAEP_PADDING, oaepHash: "sha256", }, // We convert the data string to a buffer using Buffer.from Buffer.from(data) );
console.log("encypted data: ", encryptedData.toString("base64"));
// To decrypt the data, we need to use same hashing function and padding scheme that we used for encryption.
const decryptedData = crypto.privateDecrypt( { key: privateKey, padding: crypto.constants.RSA_PKCS1_OAEP_PADDING, oaepHash: "sha256", }, encryptedData );
console.log("decrypted data: ", decryptedData.toString());