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Make secp256k1_ec_pubkey_create reject oversized secrets.

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This commit is contained in:
Gregory Maxwell 2015-02-17 00:10:12 -08:00
parent 3b7ea633fb
commit 354ffa33e6
1 changed files with 6 additions and 1 deletions
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7
src/secp256k1.c
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@ -220,12 +220,17 @@ int secp256k1_ec_pubkey_create(unsigned char *pubkey, int *pubkeylen, const unsi
secp256k1_gej_t pj; secp256k1_gej_t pj;
secp256k1_ge_t p; secp256k1_ge_t p;
secp256k1_scalar_t sec; secp256k1_scalar_t sec;
int overflow;
DEBUG_CHECK(secp256k1_ecmult_gen_consts != NULL); DEBUG_CHECK(secp256k1_ecmult_gen_consts != NULL);
DEBUG_CHECK(pubkey != NULL); DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(pubkeylen != NULL); DEBUG_CHECK(pubkeylen != NULL);
DEBUG_CHECK(seckey != NULL); DEBUG_CHECK(seckey != NULL);
secp256k1_scalar_set_b32(&sec, seckey, NULL); secp256k1_scalar_set_b32(&sec, seckey, &overflow);
if (overflow) {
*pubkeylen = 0;
return 0;
}
secp256k1_ecmult_gen(&pj, &sec); secp256k1_ecmult_gen(&pj, &sec);
secp256k1_scalar_clear(&sec); secp256k1_scalar_clear(&sec);
secp256k1_ge_set_gej(&p, &pj); secp256k1_ge_set_gej(&p, &pj);