fuzz/spki.cc

/* Copyright (c) 2016, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
  CBS cbs;
  CBS_init(&cbs, buf, len);
  EVP_PKEY *pkey = EVP_parse_public_key(&cbs);
  if (pkey == NULL) {
    ERR_clear_error();
    return 0;
  }

  uint8_t *der;
  size_t der_len;
  CBB cbb;
  if (CBB_init(&cbb, 0) &&
      EVP_marshal_public_key(&cbb, pkey) &&
      CBB_finish(&cbb, &der, &der_len)) {
    OPENSSL_free(der);
  }
  CBB_cleanup(&cbb);
  EVP_PKEY_free(pkey);
  ERR_clear_error();
  return 0;
}