Function ReadEncryptionHeader

be/src/kudu/util/env_posix.cc:838–870

}

Status ReadEncryptionHeader(int fd, const string& filename, const EncryptionHeader& server_key,
                            EncryptionHeader* eh) {
  char magic[7];
  uint8_t algorithm[1];
  char file_key[32];
  vector<Slice> headerv({ Slice(magic, 7), Slice(algorithm, 1), Slice(file_key, 32) });
  RETURN_NOT_OK(DoReadV(fd, filename, 0, headerv, nullptr));
  if (strncmp(magic, kEncryptionHeaderMagic, 7) != 0) {
    return Status::Corruption(Substitute("Invalid encryption header: $0", magic));
  }
  uint16_t key_size;
  eh->algorithm = EncryptionAlgorithm(algorithm[0]);
  switch (eh->algorithm) {
    case EncryptionAlgorithm::AES128CTR:
      key_size = 16;
      break;
    case EncryptionAlgorithm::AES192CTR:
      key_size = 24;
      break;
    case EncryptionAlgorithm::AES256CTR:
      key_size = 32;
      break;
    default:
      return Status::Corruption(Substitute("Unknown encryption algorithm: $0", algorithm));
  }
  // Round up to the nearest multiple of 16 bytes when reading and decrypting
  // the file. The actual key size can be used when storing the key in memory.
  // See WriteEncryptionHeader for more info.
  vector<Slice> v = {Slice(file_key, (key_size + 15) & -16)};
  RETURN_NOT_OK(DoDecryptV(&server_key, 0, v));
  memcpy(&eh->key, file_key, key_size);
  return Status::OK();
}

const char* ResourceLimitTypeToString(Env::ResourceLimitType t) {
  switch (t) {