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Variable time normalize

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This commit is contained in:
Pieter Wuille
2014-12-05 03:37:42 +01:00
parent ad86bdf1f2
commit 39bd94d86d
12 changed files with 160 additions and 48 deletions
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6
src/ecdsa_impl.h
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@@ -38,7 +38,7 @@ static void secp256k1_ecdsa_start(void) {
secp256k1_fe_set_b32(&ret->order_as_fe, order);
secp256k1_fe_negate(&ret->p_minus_order, &ret->order_as_fe, 1);
secp256k1_fe_normalize(&ret->p_minus_order);
secp256k1_fe_normalize_var(&ret->p_minus_order);
/* Set the global pointer. */
secp256k1_ecdsa_consts = ret;
@@ -122,7 +122,7 @@ static int secp256k1_ecdsa_sig_recompute(secp256k1_scalar_t *r2, const secp256k1
secp256k1_gej_t pr; secp256k1_ecmult(&pr, &pubkeyj, &u2, &u1);
if (!secp256k1_gej_is_infinity(&pr)) {
secp256k1_fe_t xr; secp256k1_gej_get_x_var(&xr, &pr);
secp256k1_fe_normalize(&xr);
secp256k1_fe_normalize_var(&xr);
unsigned char xrb[32]; secp256k1_fe_get_b32(xrb, &xr);
secp256k1_scalar_set_b32(r2, xrb, NULL);
ret = 1;
@@ -144,7 +144,7 @@ static int secp256k1_ecdsa_sig_recover(const secp256k1_ecdsa_sig_t *sig, secp256
secp256k1_fe_add(&fx, &secp256k1_ecdsa_consts->order_as_fe);
}
secp256k1_ge_t x;
if (!secp256k1_ge_set_xo(&x, &fx, recid & 1))
if (!secp256k1_ge_set_xo_var(&x, &fx, recid & 1))
return 0;
secp256k1_gej_t xj;
secp256k1_gej_set_ge(&xj, &x);