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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/field_impl.h
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@@ -66,7 +66,7 @@ static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
return secp256k1_fe_set_b32(r, tmp);
}
static int secp256k1_fe_sqrt(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
static int secp256k1_fe_sqrt_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
/** The binary representation of (p + 1)/4 has 3 blocks of 1s, with lengths in
* { 2, 22, 223 }. Use an addition chain to calculate 2^n - 1 for each block:
@@ -132,7 +132,7 @@ static int secp256k1_fe_sqrt(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
secp256k1_fe_sqr(&t1, r);
secp256k1_fe_negate(&t1, &t1, 1);
secp256k1_fe_add(&t1, a);
secp256k1_fe_normalize(&t1);
secp256k1_fe_normalize_var(&t1);
return secp256k1_fe_is_zero(&t1);
}
@@ -206,7 +206,7 @@ static void secp256k1_fe_inv_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
#elif defined(USE_FIELD_INV_NUM)
unsigned char b[32];
secp256k1_fe_t c = *a;
secp256k1_fe_normalize(&c);
secp256k1_fe_normalize_var(&c);
secp256k1_fe_get_b32(b, &c);
secp256k1_num_t n;
secp256k1_num_set_bin(&n, b, 32);