crypto.js

const { randomBytes } = require("react-native-randombytes");

exports.randomBytes =
  exports.rng =
  exports.pseudoRandomBytes =
  exports.prng =
  randomBytes;

// polyfill for webcrypto
exports.webcrypto = {
  getRandomValues: function(arr) {
    let orig = arr;
    if (arr.byteLength !== arr.length) {
      // Get access to the underlying raw bytes
      arr = new Uint8Array(arr.buffer);
    }
    const bytes = randomBytes(arr.length);
    for (var i = 0; i < bytes.length; i++) {
      arr[i] = bytes[i];
    }

    return orig;
  },
};

exports.createHash = exports.Hash = require("create-hash");
exports.createHmac = exports.Hmac = require("create-hmac");

const hashes = [
  "sha1",
  "sha224",
  "sha256",
  "sha384",
  "sha512",
  "md5",
  "rmd160",
].concat(Object.keys(require("browserify-sign/algos")));
exports.getHashes = function() {
  return hashes;
};
exports.createECDH = require("create-ecdh");

// assign from other modules
Object.assign(
  exports,
  require("pbkdf2"),
  require("browserify-cipher"),
  require("diffie-hellman"),
  require("browserify-sign"),
  require("public-encrypt"),
  require("randomfill")
);

// implement window crypto
if (typeof window === "object") {
  if (!window.crypto) {
    window.crypto = exports.webcrypto;
  }
}