secp256k1_ecdsa_signature_parse_der_lax.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  #include <test/util/random.h>
  11  
  12  #include <cstdint>
  13  #include <vector>
  14  
  15  bool SigHasLowR(const secp256k1_ecdsa_signature* sig);
  16  int ecdsa_signature_parse_der_lax(secp256k1_ecdsa_signature* sig, const unsigned char* input, size_t inputlen);
  17  
  18  FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)
  19  {
  20      SeedRandomStateForTest(SeedRand::ZEROS);
  21      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
  22      const std::vector<uint8_t> signature_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);
  23      if (signature_bytes.data() == nullptr) {
  24          return;
  25      }
  26      secp256k1_ecdsa_signature sig_der_lax;
  27      const bool parsed_der_lax = ecdsa_signature_parse_der_lax(&sig_der_lax, signature_bytes.data(), signature_bytes.size()) == 1;
  28      if (parsed_der_lax) {
  29          ECC_Context ecc_context{};
  30          (void)SigHasLowR(&sig_der_lax);
  31      }
  32  }
  33