frost/secp256k1-zkp
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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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8
src/ecmult_impl.h
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@@ -190,13 +190,17 @@ void static secp256k1_ecmult_gen(secp256k1_gej_t *r, const secp256k1_num_t *gn)
secp256k1_num_copy(&n, gn);
const secp256k1_ecmult_consts_t *c = secp256k1_ecmult_consts;
secp256k1_gej_set_infinity(r);
secp256k1_ge_t add;
int bits;
for (int j=0; j<64; j++) {
secp256k1_ge_t add;
int bits = secp256k1_num_shift(&n, 4);
bits = secp256k1_num_shift(&n, 4);
for (int k=0; k<sizeof(secp256k1_ge_t); k++)
((unsigned char*)(&add))[k] = c->prec[j][k][bits];
secp256k1_gej_add_ge(r, r, &add);
}
bits = 0;
secp256k1_ge_clear(&add);
secp256k1_num_clear(&n);
secp256k1_num_free(&n);
secp256k1_gej_add_ge(r, r, &c->fin);
}