const crypto = require('crypto'); let key = Buffer.from('01234567012345670123456701234567', 'utf8'); console.log(key) let iv = Buffer.from('0123456701234567', 'utf8'); console.log(iv) let ciphertext = Buffer.from([253,72,209,96,36]); const decipher = crypto.createDecipheriv('aes-256-ctr', key, iv); const plaintext = decipher.update(ciphertext); const finalPlaintext = decipher.final(); console.log(Buffer.concat([plaintext, finalPlaintext]).toString());