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       1                 :             : // Copyright (c) 2020 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         [ #  # ]:           0 : FUZZ_TARGET(secp256k1_ec_seckey_import_export_der)
      18                 :             : {
      19                 :           0 :     FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
      20                 :           0 :     secp256k1_context* secp256k1_context_sign = secp256k1_context_create(SECP256K1_CONTEXT_NONE);
      21                 :           0 :     {
      22                 :           0 :         std::vector<uint8_t> out32(32);
      23         [ #  # ]:           0 :         (void)ec_seckey_import_der(secp256k1_context_sign, out32.data(), ConsumeFixedLengthByteVector(fuzzed_data_provider, CKey::SIZE).data(), CKey::SIZE);
      24                 :           0 :     }
      25                 :           0 :     {
      26                 :           0 :         std::vector<uint8_t> seckey(CKey::SIZE);
      27                 :           0 :         const std::vector<uint8_t> key32 = ConsumeFixedLengthByteVector(fuzzed_data_provider, 32);
      28                 :           0 :         size_t seckeylen = CKey::SIZE;
      29                 :           0 :         const bool compressed = fuzzed_data_provider.ConsumeBool();
      30         [ #  # ]:           0 :         const bool exported = ec_seckey_export_der(secp256k1_context_sign, seckey.data(), &seckeylen, key32.data(), compressed);
      31         [ #  # ]:           0 :         if (exported) {
      32         [ #  # ]:           0 :             std::vector<uint8_t> out32(32);
      33         [ #  # ]:           0 :             const bool imported = ec_seckey_import_der(secp256k1_context_sign, out32.data(), seckey.data(), seckey.size()) == 1;
      34   [ #  #  #  # ]:           0 :             assert(imported && key32 == out32);
      35                 :           0 :         }
      36                 :           0 :     }
      37                 :           0 :     secp256k1_context_destroy(secp256k1_context_sign);
      38                 :           0 : }