node-forge snippets

node-forge-rsa-example.js

const generateKeyPair = ({ bits = 1024, e = 0x10001 } = {}) => {
  const keypair = forge.rsa.generateKeyPair({ bits, e });
  const publicKey = forge.pki.publicKeyToPem(keypair.publicKey);
  const privateKey = forge.pki.privateKeyToPem(keypair.privateKey);

  return {
    publicKey,
    privateKey,
  };
};

const createSignature = (message, privateKeyPem) => {
  const privateKey = forge.pki.privateKeyFromPem(privateKeyPem);
  const md = forge.md.sha256.create();
  md.update(message, 'utf8');
  const signature = privateKey.sign(md);

  return forge.util.encode64(signature);
};

const verifySignature = (message, signature, publicKeyPem) => {
  const publicKey = forge.pki.publicKeyFromPem(publicKeyPem);
  const md = forge.md.sha256.create();
  md.update(message, 'utf8');

  return publicKey.verify(md.digest().bytes(), forge.util.decode64(signature));
};