const crypto = require('crypto');

// Data to hash
const data = 'Hello, Node.js!';

// Function to hash data and get digest in different encodings
function hashWithEncoding(algorithm, data, encoding) {
  const hash = crypto.createHash(algorithm);
  hash.update(data);
  return hash.digest(encoding);
}

// Hash the data with SHA-256 and display in different encodings
console.log(`Data: "${data}"`);
console.log(`SHA-256 (hex): ${hashWithEncoding('sha256', data, 'hex')}`);
console.log(`SHA-256 (base64): ${hashWithEncoding('sha256', data, 'base64')}`);
console.log(`SHA-256 (base64url): ${hashWithEncoding('sha256', data, 'base64url')}`);
console.log(`SHA-256 (binary): ${hashWithEncoding('sha256', data, 'binary')}`);

// Get the digest as a Buffer (no encoding)
const hash = crypto.createHash('sha256');
hash.update(data);
const buffer = hash.digest();
console.log('SHA-256 (Buffer):', buffer);
console.log('Buffer length:', buffer.length, 'bytes');