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      1 /*
      2  * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  * https://www.openssl.org/source/license.html
      8  * or in the file LICENSE in the source distribution.
      9  */
     10 
     11 /*
     12  * Fuzz the parser used for dumping ASN.1 using "openssl asn1parse".
     13  */
     14 
     15 #include <stdio.h>
     16 #include <openssl/asn1.h>
     17 #include <openssl/x509.h>
     18 #include <openssl/x509v3.h>
     19 #include <openssl/err.h>
     20 #include "fuzzer.h"
     21 
     22 static BIO *bio_out;
     23 
     24 int FuzzerInitialize(int *argc, char ***argv)
     25 {
     26     bio_out = BIO_new(BIO_s_null()); /* output will be ignored */
     27     if (bio_out == NULL)
     28         return 0;
     29     OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
     30     ERR_clear_error();
     31     CRYPTO_free_ex_index(0, -1);
     32     return 1;
     33 }
     34 
     35 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
     36 {
     37     (void)ASN1_parse_dump(bio_out, buf, len, 0, 0);
     38     ERR_clear_error();
     39     return 0;
     40 }
     41 
     42 void FuzzerCleanup(void)
     43 {
     44     BIO_free(bio_out);
     45 }
     46