secp256k1_ec_seckey_import_export_der.cpp raw

   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  }
  39