Nodejs Basic aes256 encrypt decrypt implementation

cryptor.js

const crypto = require('crypto');
const TAG = 'cryptor || '


/**
 * @typedef CryptResult
 * @property {string} iv
 * @property {string} crypt
 */

/**
 * @description AES256 Encryption
 * @param {string} key Secret Key
 * @param {string} plain utf8 text to encrypt
 * @return {Promise<CryptResult>}
 */
exports.encrypt = async (key, plain) => new Promise((resolve, reject) => {
  const funcName = 'encrypt';
  try {
    const _key = Buffer.from(key).toString('hex').slice(0, 32);
    const iv = crypto.randomBytes(16).toString('hex').slice(0, 16);
    const cipher = crypto.createCipheriv('aes256', _key, iv);
    let crypt = cipher.update(plain, 'utf8', 'hex');
    crypt += cipher.final('hex');
    resolve({
      crypt,
      iv,
    });
  } catch (e) {
    console.log(TAG, funcName, e);
    reject(e);
  }

});
/**
 * @description AES256 Decryption
 * @param {string} key Secret Key
 * @param {string} iv Encrypted IV from the corespondent encryption
 * @param {string} crypt Encrypted data
 * @return {Promise<string>}
 */
exports.decrypt = async (key, iv, crypt) => new Promise((resolve, reject) => {
    const funcName = 'decrypt';
    try {
      const _key = Buffer.from(key).toString('hex').slice(0, 32);
      const chiper = crypto.createDecipheriv('aes256', _key, iv);
      let decoded = chiper.update(crypt, 'hex', 'utf8');
      decoded += chiper.final('utf8');
      resolve(decoded);
    } catch (e) {
      console.log(TAG, funcName, e);
      reject(e);
    }
});