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Check for overflows when order is added at recovery

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Pieter Wuille 2013-11-07 20:25:03 +01:00 • committed by Pieter Wuille
parent 32b60cb5fb
commit ad52495d72
1 changed files with 4 additions and 1 deletions
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5
src/impl/ecdsa.h
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@ -123,8 +123,11 @@ int static secp256k1_ecdsa_sig_recover(const secp256k1_ecdsa_sig_t *sig, secp256
secp256k1_num_t rx;
secp256k1_num_init(&rx);
secp256k1_num_copy(&rx, &sig->r);
if (recid & 2)
if (recid & 2) {
secp256k1_num_add(&rx, &rx, &c->order);
if (secp256k1_num_cmp(&rx, &secp256k1_fe_consts->p) >= 0)
return 0;
}
unsigned char brx[32];
secp256k1_num_get_bin(brx, 32, &rx);
secp256k1_num_free(&rx);