Method init

src/client/FSCrypt.cc:299–313

}

int FSCryptKey::init(const char *k, int klen) {
  int r = fscrypt_calc_hkdf(HKDF_CONTEXT_KEY_IDENTIFIER,
                            nullptr, 0, /* nonce */
                            nullptr, 0, /* salt */
                            (const char *)k, klen,
                            identifier.raw, sizeof(identifier.raw));
  if (r < 0) {
    return r;
  }

  key.append_hole(klen);
  memcpy(key.c_str(), k, klen);

  return 0;
}

int FSCryptKey::calc_hkdf(char ctx_identifier,
                          const char *nonce, int nonce_len,