@zondax/ledger-filecoin/tests/utils.js

Node API for Filecoin App (Ledger Nano S/X)

import blake2 from "blake2";

const CID_PREFIX = Buffer.from([0x01, 0x71, 0xa0, 0xe4, 0x02, 0x20]);

export function getCID(message) {
  const hasher = blake2.createHash("blake2b", { digestLength: 32 });
  hasher.update(message);
  return Buffer.concat([CID_PREFIX, hasher.digest()]);
}

export function getDigest(message) {
  // digest = blake2-256( prefix + blake2b-256(tx) )

  const hasher = blake2.createHash("blake2b", { digestLength: 32 });
  hasher.update(getCID(message));
  return hasher.digest();
}