const crypto = require('crypto');

// Generate key pairs for different algorithms
function generateRSAKeyPair() {
  return crypto.generateKeyPairSync('rsa', {
    modulusLength: 2048,
    publicKeyEncoding: {
      type: 'spki',
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'pkcs8',
      format: 'pem'
    }
  });
}

function generateECKeyPair() {
  return crypto.generateKeyPairSync('ec', {
    namedCurve: 'prime256v1',
    publicKeyEncoding: {
      type: 'spki',
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'sec1',
      format: 'pem'
    }
  });
}

// Generate different key pairs
const rsaKeys = generateRSAKeyPair();
const ecKeys = generateECKeyPair();

// Message to sign
const message = 'Message to sign with different algorithms';

// Function to sign with a specific algorithm
function signWithAlgorithm(algorithm, privateKey, message) {
  try {
    const sign = crypto.createSign(algorithm);
    sign.update(message);
    return sign.sign(privateKey, 'hex');
  } catch (error) {
    return `Error: ${error.message}`;
  }
}

// Test various signature algorithms
console.log(`Message: "${message}"`);
console.log('-----------------------------------------------');

// RSA signatures with different hash algorithms
console.log('RSA-SHA256:', signWithAlgorithm('SHA256', rsaKeys.privateKey, message));
console.log('RSA-SHA384:', signWithAlgorithm('SHA384', rsaKeys.privateKey, message));
console.log('RSA-SHA512:', signWithAlgorithm('SHA512', rsaKeys.privateKey, message));

console.log('-----------------------------------------------');

// ECDSA signatures
console.log('ECDSA-SHA256:', signWithAlgorithm('SHA256', ecKeys.privateKey, message));
console.log('ECDSA-SHA384:', signWithAlgorithm('SHA384', ecKeys.privateKey, message));