const crypto = require('crypto');
const fs = require('fs');

const cipher = crypto.createCipher('aes192', 'a password');

const encInput = fs.createReadStream('test.txt');
const encOutput = fs.createWriteStream('test.encrypted');

encInput.pipe(cipher).pipe(encOutput);

const decipher = crypto.createDecipher('aes192', 'a password');

const decInput = fs.createReadStream('test.encrypted');
const decOutput = fs.createWriteStream('test.decrypted');

decInput.pipe(decipher).pipe(decOutput);