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src/libsecp256k1/ecdsa.cpp: Adding ecdsa_recover()

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Henrik Hautakoski 2023-03-21 13:19:58 +01:00
parent 53e126cb62
commit 91764f43de
1 changed files with 25 additions and 0 deletions
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25
src/libsecp256k1/ecdsa.cpp
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@ -89,5 +89,30 @@ int ecdsa_verify(const sha256_t* digest, const ec_signature_t& sig, const ec_pub
return secp256k1_ecdsa_verify(ctx, &ec_sig, digest->data, &pubkey) > 0 ? 0 : -1;
}
int ecdsa_recover(const sha256_t* digest, const ec_signature_t& sig, ec_pubkey_t& pubkey) {
secp256k1_pubkey ec_pubkey;
secp256k1_ecdsa_recoverable_signature ec_sig;
size_t len = EC_PUBKEY_SIZE;
int recid;
recid = sig.at(0) - 27 - 4;
// Parse signature
if (!secp256k1_ecdsa_recoverable_signature_parse_compact(ctx, &ec_sig, sig.data() + 1, recid)) {
std::cout << "parse sig" << std::endl;
return -1;
}
// Recover public key
if (!secp256k1_ecdsa_recover(ctx, &ec_pubkey, &ec_sig, digest->data)) {
return -1;
}
secp256k1_ec_pubkey_serialize(ctx, pubkey.data(), &len, &ec_pubkey, SECP256K1_EC_COMPRESSED);
return len != EC_PUBKEY_SIZE ? -1 : 0;
}
} // namespace libeosio