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Try to not leave secret data on the stack or heap.

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This makes a basic effort and has not been audited.
Doesn't appear to have a measurable performance impact on bench.

It also adds a secp256k1_num_free to secp256k1_ecdsa_pubkey_create.
This commit is contained in:
Gregory Maxwell
2014-08-14 06:58:57 -07:00
parent 13e44df743
commit 2f6c801911
11 changed files with 84 additions and 3 deletions
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13
src/group_impl.h
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@@ -102,6 +102,19 @@ void static secp256k1_gej_set_xy(secp256k1_gej_t *r, const secp256k1_fe_t *x, co
secp256k1_fe_set_int(&r->z, 1);
}
void static secp256k1_gej_clear(secp256k1_gej_t *r) {
r->infinity = 0;
secp256k1_fe_clear(&r->x);
secp256k1_fe_clear(&r->y);
secp256k1_fe_clear(&r->z);
}
void static secp256k1_ge_clear(secp256k1_ge_t *r) {
r->infinity = 0;
secp256k1_fe_clear(&r->x);
secp256k1_fe_clear(&r->y);
}
int static secp256k1_ge_set_xo(secp256k1_ge_t *r, const secp256k1_fe_t *x, int odd) {
r->x = *x;
secp256k1_fe_t x2; secp256k1_fe_sqr(&x2, x);