1  // Copyright (c) 2020-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <key.h>
 6  #include <secp256k1.h>
 7  #include <test/fuzz/FuzzedDataProvider.h>
 8  #include <test/fuzz/fuzz.h>
 9  #include <test/fuzz/util.h>
10  
11  #include <cstdint>
12  #include <vector>
13  
14  int ec_seckey_import_der(const secp256k1_context* ctx, unsigned char* out32, const unsigned char* seckey, size_t seckeylen);
15  int ec_seckey_export_der(const secp256k1_context* ctx, unsigned char* seckey, size_t* seckeylen, const unsigned char* key32, bool compressed);
16  
17  FUZZ_TARGET(secp256k1_ec_seckey_import_export_der)
18  {
19      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
20      {
21          std::vector<uint8_t> out32(32);
22          (void)ec_seckey_import_der(secp256k1_context_static, out32.data(), ConsumeFixedLengthByteVector(fuzzed_data_provider, CKey::SIZE).data(), CKey::SIZE);
23      }
24      {
25          std::vector<uint8_t> seckey(CKey::SIZE);
26          const std::vector<uint8_t> key32 = ConsumeFixedLengthByteVector(fuzzed_data_provider, 32);
27          size_t seckeylen = CKey::SIZE;
28          const bool compressed = fuzzed_data_provider.ConsumeBool();
29          secp256k1_context* secp256k1_context_sign = secp256k1_context_create(SECP256K1_CONTEXT_NONE);
30          const bool exported = ec_seckey_export_der(secp256k1_context_sign, seckey.data(), &seckeylen, key32.data(), compressed);
31          secp256k1_context_destroy(secp256k1_context_sign);
32          if (exported) {
33              std::vector<uint8_t> out32(32);
34              const bool imported = ec_seckey_import_der(secp256k1_context_static, out32.data(), seckey.data(), seckey.size()) == 1;
35              assert(imported && key32 == out32);
36          }
37      }
38  }