// Copyright 2020 Google Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

////////////////////////////////////////////////////////////////////////////////

// This fuzz target fuzzes the same API as

// https://github.com/google/boringssl/blob/master/fuzz/cert.cc, but it employs

// libprotobuf-mutator for structure-aware fuzzing.

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/x509.h>

#include "asn1_pdu.pb.h"

#include "asn1_pdu_to_der.h"

#include "libprotobuf-mutator/src/libfuzzer/libfuzzer_macro.h"

DEFINE_PROTO_FUZZER(const asn1_pdu::PDU& asn1) {

  asn1_pdu::ASN1PDUToDER converter;

  std::vector<uint8_t> encoded = converter.PDUToDER(asn1);

  const uint8_t* buf = encoded.data();

  size_t len = encoded.size();

  X509* x509 = d2i_X509(NULL, &buf, len);

  if (x509 != NULL) {

    // Extract the public key.

    EVP_PKEY_free(X509_get_pubkey(x509));

    // Reserialize the structure.

    uint8_t* der = NULL;

    i2d_X509(x509, &der);

    OPENSSL_free(der);

  }

  X509_free(x509);

  ERR_clear_error();

}