browserify-sign

const { Sign, Verify } = require('browserify-sign'); const crypto = require('crypto'); // Node.js 'crypto' for key generation (use pre-generated keys in browser) // In a browser environment, you would typically load pre-existing private and public keys. // For demonstration purposes, we generate them (requires Node.js crypto module). // NEVER hardcode keys in production. const { privateKey, publicKey } = crypto.generateKeyPairSync('rsa', { modulusLength: 2048, publicKeyEncoding: { type: 'spki', format: 'pem' }, privateKeyEncoding: { type: 'pkcs8', format: 'pem' } }); const data = 'This is the message to be signed.'; const algorithm = 'sha256'; // Hashing algorithm, e.g., 'sha256', 'rsa-sha256' // --- Signing Process --- const signer = new Sign(algorithm); signer.update(data); signer.end(); // Indicate no more data will be written // The privateKey must be loaded securely. const signature = signer.sign(privateKey, 'base64'); console.log('Generated Signature:', signature); // --- Verification Process --- const verifier = new Verify(algorithm); verifier.update(data); verifier.end(); // Indicate no more data will be written // The publicKey must be loaded securely. const isVerified = verifier.verify(publicKey, signature, 'base64'); console.log('Signature Verification Result:', isVerified); if (isVerified) { console.log('The signature is valid for the data and public key.'); } else { console.error('The signature is NOT valid.'); }