int secp256k1_ecdsa_verify(const secp256k1_context_t* ctx, const unsigned char *msg32, const unsigned char *sig, int siglen, const unsigned char *pubkey, int pubkeylen) {
secp256k1_ge_t q;
secp256k1_ecdsa_sig_t s;
secp256k1_scalar_t m;
int ret = -3;
DEBUG_CHECK(ctx != NULL);
DEBUG_CHECK(secp256k1_ecmult_context_is_built(&ctx->ecmult_ctx));
DEBUG_CHECK(msg32 != NULL);
DEBUG_CHECK(sig != NULL);
DEBUG_CHECK(pubkey != NULL);
secp256k1_scalar_set_b32(&m, msg32, NULL);
if (secp256k1_eckey_pubkey_parse(&q, pubkey, pubkeylen)) {
if (secp256k1_ecdsa_sig_parse(&s, sig, siglen)) {
if (secp256k1_ecdsa_sig_verify(&ctx->ecmult_ctx, &s, &q, &m)) {
/* success is 1, all other values are fail */
ret = 1;
} else {
ret = 0;
}
} else {
ret = -2;
}
} else {
ret = -1;
}
return ret;
}
int secp256k1_ec_pubkey_tweak_mul(const secp256k1_context_t* ctx, unsigned char *pubkey, int pubkeylen, const unsigned char *tweak) {
secp256k1_ge_t p;
secp256k1_scalar_t factor;
int ret = 0;
int overflow = 0;
DEBUG_CHECK(ctx != NULL);
DEBUG_CHECK(secp256k1_ecmult_context_is_built(&ctx->ecmult_ctx));
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(tweak != NULL);
secp256k1_scalar_set_b32(&factor, tweak, &overflow);
if (!overflow) {
ret = secp256k1_eckey_pubkey_parse(&p, pubkey, pubkeylen);
if (ret) {
ret = secp256k1_eckey_pubkey_tweak_mul(&ctx->ecmult_ctx, &p, &factor);
}
if (ret) {
int oldlen = pubkeylen;
ret = secp256k1_eckey_pubkey_serialize(&p, pubkey, &pubkeylen, oldlen <= 33);
VERIFY_CHECK(pubkeylen == oldlen);
}
}
return ret;
}
int secp256k1_ec_pubkey_verify(const secp256k1_context_t* ctx, const unsigned char *pubkey, int pubkeylen) {
secp256k1_ge_t q;
DEBUG_CHECK(ctx != NULL);
DEBUG_CHECK(pubkey != NULL);
(void)ctx;
return secp256k1_eckey_pubkey_parse(&q, pubkey, pubkeylen);
}
int secp256k1_ec_pubkey_decompress(const secp256k1_context_t* ctx, unsigned char *pubkey, int *pubkeylen) {
secp256k1_ge_t p;
int ret = 0;
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(pubkeylen != NULL);
(void)ctx;
if (secp256k1_eckey_pubkey_parse(&p, pubkey, *pubkeylen)) {
ret = secp256k1_eckey_pubkey_serialize(&p, pubkey, pubkeylen, 0);
}
return ret;
}
int secp256k1_ec_pubkey_parse(const secp256k1_context_t* ctx, secp256k1_pubkey_t* pubkey, const unsigned char *input, size_t inputlen) {
secp256k1_ge_t Q;
(void)ctx;
if (!secp256k1_eckey_pubkey_parse(&Q, input, inputlen)) {
memset(pubkey, 0, sizeof(*pubkey));
return 0;
}
secp256k1_pubkey_save(pubkey, &Q);
secp256k1_ge_clear(&Q);
return 1;
}
int secp256k1_ec_pubkey_parse(const secp256k1_context* ctx, secp256k1_pubkey* pubkey, const unsigned char *input, size_t inputlen) {
secp256k1_ge Q;
VERIFY_CHECK(ctx != NULL);
ARG_CHECK(pubkey != NULL);
memset(pubkey, 0, sizeof(*pubkey));
ARG_CHECK(input != NULL);
if (!secp256k1_eckey_pubkey_parse(&Q, input, inputlen)) {
return 0;
}
secp256k1_pubkey_save(pubkey, &Q);
secp256k1_ge_clear(&Q);
return 1;
}
void Sec256Dsa::ParsePubKey(RCSpan cbuf) {
if (!secp256k1_eckey_pubkey_parse(&m_pubkey, cbuf.data(), cbuf.size()))
throw CryptoException(make_error_code(ExtErr::Crypto), "Invalid PubKey");
}
