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Apply bugfix to Edwards25519.pointsMulVarTime

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This commit is contained in:
Olivier Chéron 2017-12-16 07:19:41 +01:00
parent b962952c30
commit 251f164f47
1 changed files with 7 additions and 1 deletions
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8
cbits/ed25519/ed25519-donna-impl-base.h
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@ -287,7 +287,13 @@ ge25519_double_scalarmult_vartime(ge25519 *r, const ge25519 *p1, const bignum256
ge25519_nielsadd2_p1p1(&t, r, &ge25519_niels_sliding_multiples[abs(slide2[i]) / 2], (unsigned char)slide2[i] >> 7); ge25519_nielsadd2_p1p1(&t, r, &ge25519_niels_sliding_multiples[abs(slide2[i]) / 2], (unsigned char)slide2[i] >> 7);
} }
ge25519_p1p1_to_partial(r, &t); // diverges from the original source code and resolves bug explained
// in <https://github.com/floodyberry/ed25519-donna/issues/31>
if (i == 0) {
ge25519_p1p1_to_full(r, &t);
} else {
ge25519_p1p1_to_partial(r, &t);
}
} }
} }