human-crypto-keys/es/utils/prng.js

Generate and import human-friendly cryptographic keys using mnemonics or seeds

import util from 'node-forge/lib/util';
import HmacDrgb from 'hmac-drbg';
import hash from 'hash.js';

const createPrng = seed => {
  const hmacDrgb = new HmacDrgb({
    hash: hash.sha256,
    entropy: util.binary.hex.encode(seed),
    nonce: null,
    pers: null
  });
  return {
    getBytesSync: size => {
      const bytesArray = hmacDrgb.generate(size);
      const bytes = new Uint8Array(bytesArray);
      return util.binary.raw.encode(bytes);
    }
  };
};

export default createPrng;