Bitcoin Core  22.99.0
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(const secp256k1_context* ctx, 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  }
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 }
secp256k1_ecdsa_signature
Opaque data structured that holds a parsed ECDSA signature.
Definition: secp256k1.h:83
SECP256K1_CONTEXT_VERIFY
#define SECP256K1_CONTEXT_VERIFY
Flags to pass to secp256k1_context_create, secp256k1_context_preallocated_size, and secp256k1_context...
Definition: secp256k1.h:184
FUZZ_TARGET
FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)
Definition: secp256k1_ecdsa_signature_parse_der_lax.cpp:17
secp256k1_context_struct
Definition: secp256k1.c:75
util.h
ecdsa_signature_parse_der_lax
int ecdsa_signature_parse_der_lax(const secp256k1_context *ctx, 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:35
secp256k1_context_destroy
SECP256K1_API void secp256k1_context_destroy(secp256k1_context *ctx)
Destroy a secp256k1 context object (created in dynamically allocated memory).
Definition: secp256k1.c:202
secp256k1_context_create
SECP256K1_API secp256k1_context * secp256k1_context_create(unsigned int flags) SECP256K1_WARN_UNUSED_RESULT
Create a secp256k1 context object (in dynamically allocated memory).
Definition: secp256k1.c:158
secp256k1.h
ECC_Stop
void ECC_Stop()
Deinitialize the elliptic curve support.
Definition: key.cpp:387
SigHasLowR
bool SigHasLowR(const secp256k1_ecdsa_signature *sig)
Definition: key.cpp:201
FuzzedDataProvider.h
ConsumeRandomLengthByteVector
std::vector< uint8_t > ConsumeRandomLengthByteVector(FuzzedDataProvider &fuzzed_data_provider, const std::optional< size_t > &max_length=std::nullopt) noexcept
Definition: util.h:61
ECC_Start
void ECC_Start()
Initialize the elliptic curve support.
Definition: key.cpp:370
key.h
fuzz.h
FuzzedDataProvider
Definition: FuzzedDataProvider.h:31
secp256k1_ecdsa_signature::data
unsigned char data[64]
Definition: secp256k1.h:84
ctx
static secp256k1_context * ctx
Definition: tests.c:42