Inside Bitcoin
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Inside Bitcoin
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The code behind the network, with room to understand it.
Release published 2026-10-28 · Snapshot fetched 2026-11-01. Latest stable release at fetch time; development branches and Git history are excluded. Only the selected code window and visible folders load here.
1// Copyright (c) 2020-present The Bitcoin Core developers2// Distributed under the MIT software license, see the accompanying3// file COPYING or http://www.opensource.org/licenses/mit-license.php.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>12#include <cstdint>13#include <vector>15bool SigHasLowR(const secp256k1_ecdsa_signature* sig);16int ecdsa_signature_parse_der_lax(secp256k1_ecdsa_signature* sig, const unsigned char* input, size_t inputlen);18FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)19{20SeedRandomStateForTest(SeedRand::ZEROS);21FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};22const std::vector<uint8_t> signature_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);23if (signature_bytes.data() == nullptr) {24return;25}26secp256k1_ecdsa_signature sig_der_lax;27const bool parsed_der_lax = ecdsa_signature_parse_der_lax(&sig_der_lax, signature_bytes.data(), signature_bytes.size()) == 1;28if (parsed_der_lax) {29ECC_Context ecc_context{};30(void)SigHasLowR(&sig_der_lax);31}32}
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