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crypto/edwards25519: faster point decompression

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Make recovery of the x-coordinate slightly faster.

See https://mailarchive.ietf.org/arch/msg/cfrg/qlKpMBqxXZYmDpXXIx6LO3Oznv4/
for details.
This commit is contained in:
Frank Denis 2021-12-27 18:29:25 +01:00 committed by Andrew Kelley
parent 4266795743
commit 3abe464b06
1 changed files with 1 additions and 2 deletions
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3
lib/std/crypto/25519/edwards25519.zig
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@ -34,8 +34,7 @@ pub const Edwards25519 = struct {
var v = u.mul(Fe.edwards25519d);
u = u.sub(z);
v = v.add(z);
const v3 = v.sq().mul(v);
var x = v3.sq().mul(v).mul(u).pow2523().mul(v3).mul(u);
var x = u.mul(v).pow2523().mul(u);
const vxx = x.sq().mul(v);
const has_m_root = vxx.sub(u).isZero();
const has_p_root = vxx.add(u).isZero();