Bitcoin Core  27.99.0
P2P Digital Currency
secp256k1_ecdsa_signature_parse_der_lax.cpp
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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>
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(secp256k1_ecdsa_signature* sig, const unsigned char* input, size_t inputlen);
16 
17 FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)
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_ecdsa_signature sig_der_lax;
25  const bool parsed_der_lax = ecdsa_signature_parse_der_lax(&sig_der_lax, signature_bytes.data(), signature_bytes.size()) == 1;
26  if (parsed_der_lax) {
28  (void)SigHasLowR(&sig_der_lax);
29  }
30 }
ECC_Context ecc_context
RAII class initializing and deinitializing global state for elliptic curve support.
Definition: key.h:247
int ecdsa_signature_parse_der_lax(secp256k1_ecdsa_signature *sig, const unsigned char *input, size_t inputlen)
This function is taken from the libsecp256k1 distribution and implements DER parsing for ECDSA signat...
Definition: pubkey.cpp:43
bool SigHasLowR(const secp256k1_ecdsa_signature *sig)
Definition: key.cpp:196
FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)
Opaque data structured that holds a parsed ECDSA signature.
Definition: secp256k1.h:87
unsigned char data[64]
Definition: secp256k1.h:88
std::vector< B > ConsumeRandomLengthByteVector(FuzzedDataProvider &fuzzed_data_provider, const std::optional< size_t > &max_length=std::nullopt) noexcept
Definition: util.h:57