bsv/lib/aescbc.js

/**
 * Aescbc (experimental)
 * =====================
 *
 * This is a convenience class for using Aes with Cbc. This is a low-level tool
 * that does not include authentication. You should only use this if you are
 * authenticating your data somehow else.
 */
'use strict'

import { Aes } from './aes'
import { Cbc } from './cbc'
import { Random } from './random'

class Aescbc { }

Aescbc.encrypt = function (messageBuf, cipherKeyBuf, ivBuf, concatIvBuf = true) {
  ivBuf = ivBuf || Random.getRandomBuffer(128 / 8)
  const ctBuf = Cbc.encrypt(messageBuf, ivBuf, Aes, cipherKeyBuf)
  if (concatIvBuf) {
    return Buffer.concat([ivBuf, ctBuf])
  } else {
    return ctBuf
  }
}

Aescbc.decrypt = function (encBuf, cipherKeyBuf, ivBuf = false) {
  if (!ivBuf) {
    const ivBuf = encBuf.slice(0, 128 / 8)
    const ctBuf = encBuf.slice(128 / 8)
    return Cbc.decrypt(ctBuf, ivBuf, Aes, cipherKeyBuf)
  } else {
    const ctBuf = encBuf
    return Cbc.decrypt(ctBuf, ivBuf, Aes, cipherKeyBuf)
  }
}

export { Aescbc }