const sha256 = require('sha256-wasm')
const sha512 = require('sha512-wasm')

var crypto_hash_sha256_BYTES = 32
var crypto_hash_sha512_BYTES = 64
var crypto_hash_BYTES = crypto_hash_sha512_BYTES

function crypto_hash_sha256 (out, m, n) {
  check(out, crypto_hash_sha256_BYTES)

  sha256().update(m.subarray(0, n)).digest(out)
  return 0
}

function crypto_hash_sha512 (out, m, n) {
  check(out, crypto_hash_sha512_BYTES)

  sha512().update(m.subarray(0, n)).digest(out)
  return 0
}

function crypto_hash (out, m, n) {
  return crypto_hash_sha512(out, m, n)
}

module.exports = {
  crypto_hash,
  crypto_hash_sha256,
  crypto_hash_sha512,
  crypto_hash_BYTES,
  crypto_hash_sha256_BYTES
}

function check (buf, len) {
  if (!buf || (len && buf.length < len)) throw new Error('Argument must be a buffer' + (len ? ' of length ' + len : ''))
}