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| author | Samuel Neves <sneves@dei.uc.pt> | 2018-07-28 05:31:10 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2018-07-28 14:47:25 +0200 |
| commit | 2ff62d8431b18db111c126dd2ef26e5417da1c62 (patch) | |
| tree | 4395434f107a203e4d21f2f3d99c525147c37cc4 /src/crypto/curve25519.c | |
| parent | 7570a39724d19180ca1c62e4c960e1c19fa0756f (diff) | |
curve25519-x86_64: tighten the x25519 assembly
The wide multiplication by 38 in mul_a24_eltfp25519_1w is redundant:
(2^256-1) * 121666 / 2^256 is at most 121665, and therefore a 64-bit
multiplication can never overflow.
Change inspired by Andy Polyakov's OpenSSL implementation.
Signed-off-by: Samuel Neves <sneves@dei.uc.pt>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'src/crypto/curve25519.c')
0 files changed, 0 insertions, 0 deletions