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ed25519: scalarmult fixes

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- operation result parameter can be the same as operation input parameter
- operation returns full extended Edwards point
This commit is contained in:
Dusan Klinec 2018-08-18 02:24:48 +02:00 committed by Pavol Rusnak
parent 72da171f28
commit f1eca08383
1 changed files with 5 additions and 4 deletions
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9
ed25519-donna/ed25519-donna-impl-base.c
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@ -425,12 +425,12 @@ void ge25519_scalarmult(ge25519 *r, const ge25519 *p1, const bignum256modm s1) {
contract256_window4_modm(slide1, s1); contract256_window4_modm(slide1, s1);
/* set neutral */
ge25519_set_neutral(r);
ge25519_full_to_pniels(pre1, r);
ge25519_full_to_pniels(pre1+1, p1); ge25519_full_to_pniels(pre1+1, p1);
ge25519_double(&d1, p1); ge25519_double(&d1, p1);
ge25519_set_neutral(r);
ge25519_full_to_pniels(pre1, r);
ge25519_full_to_pniels(pre1+2, &d1); ge25519_full_to_pniels(pre1+2, &d1);
for (i = 1; i < 7; i++) { for (i = 1; i < 7; i++) {
ge25519_pnielsadd(&pre1[i+2], &d1, &pre1[i]); ge25519_pnielsadd(&pre1[i+2], &d1, &pre1[i]);
@ -447,6 +447,7 @@ void ge25519_scalarmult(ge25519 *r, const ge25519 *p1, const bignum256modm s1) {
ge25519_pnielsadd_p1p1(&t, r, &pre, (unsigned char)slide1[i] >> 7); ge25519_pnielsadd_p1p1(&t, r, &pre, (unsigned char)slide1[i] >> 7);
ge25519_p1p1_to_partial(r, &t); ge25519_p1p1_to_partial(r, &t);
} }
curve25519_mul(r->t, t.x, t.y);
} }
void ge25519_scalarmult_base_choose_niels(ge25519_niels *t, const uint8_t table[256][96], uint32_t pos, signed char b) { void ge25519_scalarmult_base_choose_niels(ge25519_niels *t, const uint8_t table[256][96], uint32_t pos, signed char b) {