encrypt.js

import crypto from 'crypto';
export function getAesSecretKey() {
  return crypto.randomBytes(16).toString('base64'); // Generate a 128-bit AES secret key (16 bytes) and convert it to Base64
}

export function getDecryptedSecretKey(key, privateKey) {
  const privateKeyBuffer = Buffer.from(privateKey, 'base64');
  const decryptedKeyBuffer = crypto.privateDecrypt(
    privateKeyBuffer,
    Buffer.from(key, 'base64'),
  );
  return decryptedKeyBuffer.toString('base64');
}

export function decryptBodyWithSecretKey(decryptedKey, encryptedTextString) {
  const iv = Buffer.from(decryptedKey, 'base64');
  const secretKey = Buffer.from(decryptedKey, 'base64');
  const decipher = crypto.createDecipheriv('aes-128-cbc', secretKey, iv);
  let decryptedBody = decipher.update(encryptedTextString, 'base64', 'utf-8');
  decryptedBody += decipher.final('utf-8');
  return decryptedBody;
}

export function encryptKey(aesKey, publicKey) {
  const publicKeyBuffer = Buffer.from(publicKey, 'base64');
  const encryptedKeyBuffer = crypto.publicEncrypt(
    publicKeyBuffer,
    Buffer.from(aesKey, 'base64'),
  );
  return encryptedKeyBuffer.toString('base64');
}

export function encryptBody(data, aesKey) {
  const iv = crypto.randomBytes(16);
  const secretKey = Buffer.from(aesKey, 'base64');
  const cipher = crypto.createCipheriv('aes-128-cbc', secretKey, iv);
  let encryptedBody = cipher.update(data, 'utf-8', 'base64');
  encryptedBody += cipher.final('base64');
  return encryptedBody;
}