Crypto Hashing + AES (Node.js)

import crypto from 'crypto'

function sha256Hex(input) {
  return crypto.createHash('sha256').update(input).digest('hex')
}

console.log(sha256Hex('d3c0d3r'))

import bcrypt from 'bcryptjs'

const password = 'superSecret!'
const salt = bcrypt.genSaltSync(12)
const hash = bcrypt.hashSync(password, salt)

console.log('Hash:', hash)
console.log('Match?', bcrypt.compareSync(password, hash))

import crypto from 'crypto'

function encryptGCM(plaintext, key) {
  const iv = crypto.randomBytes(12) // 96-bit IV
  const cipher = crypto.createCipheriv('aes-256-gcm', key, iv)
  const ciphertext = Buffer.concat([cipher.update(plaintext, 'utf8'), cipher.final()])
  const tag = cipher.getAuthTag()
  return { iv, ciphertext, tag }
}

function decryptGCM({ iv, ciphertext, tag }, key) {
  const decipher = crypto.createDecipheriv('aes-256-gcm', key, iv)
  decipher.setAuthTag(tag)
  const plaintext = Buffer.concat([decipher.update(ciphertext), decipher.final()])
  return plaintext.toString('utf8')
}

const key = crypto.randomBytes(32) // 256-bit key
const sealed = encryptGCM('dark web ops', key)
console.log('Decrypted:', decryptGCM(sealed, key))