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 bool SigHasLowR(const secp256k1_ecdsa_signature* sig); 15 int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1_ecdsa_signature* sig, const unsigned char* input, size_t inputlen); 16 test_one_input(const std::vector<uint8_t> & buffer)17void test_one_input(const std::vector<uint8_t>& buffer) 18 { 19 FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; 20 const std::vector<uint8_t> signature_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider); 21 if (signature_bytes.data() == nullptr) { 22 return; 23 } 24 secp256k1_context* secp256k1_context_verify = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY); 25 secp256k1_ecdsa_signature sig_der_lax; 26 const bool parsed_der_lax = ecdsa_signature_parse_der_lax(secp256k1_context_verify, &sig_der_lax, signature_bytes.data(), signature_bytes.size()) == 1; 27 if (parsed_der_lax) { 28 ECC_Start(); 29 (void)SigHasLowR(&sig_der_lax); 30 ECC_Stop(); 31 } 32 secp256k1_context_destroy(secp256k1_context_verify); 33 } 34