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Add comment, use @truncate

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This commit is contained in:
Frank Denis 2020-08-15 11:11:33 +02:00 committed by Andrew Kelley
parent bcef123d90
commit d86cde5752
2 changed files with 3 additions and 3 deletions
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2
lib/std/crypto/25519/curve25519.zig
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@ -43,7 +43,7 @@ pub const Curve25519 = struct {
var swap: u8 = 0;
var pos: usize = bits - 1;
while (true) : (pos -= 1) {
const b = (s[pos / 8] >> @intCast(u3, pos & 7)) & 1;
const b = (s[pos >> 3] >> @truncate(u3, pos)) & 1;
swap ^= b;
Fe.cSwap2(&x2, &x3, &z2, &z3, swap);
swap = b;

4
lib/std/crypto/25519/edwards25519.zig
View File

@ -28,7 +28,7 @@ pub const Edwards25519 = struct {
const vxx = x.sq().mul(v);
const has_m_root = vxx.sub(u).isZero();
const has_p_root = vxx.add(u).isZero();
if ((@boolToInt(has_m_root) | @boolToInt(has_p_root)) == 0) {
if ((@boolToInt(has_m_root) | @boolToInt(has_p_root)) == 0) { // best-effort to avoid two conditional branches
return error.InvalidEncoding;
}
x.cMov(x.mul(Fe.sqrtm1), 1 - @boolToInt(has_m_root));
@ -130,7 +130,7 @@ pub const Edwards25519 = struct {
var pos: usize = 252;
while (true) : (pos -= 4) {
q = q.dbl().dbl().dbl().dbl();
const b = (s[pos / 8] >> @intCast(u3, pos & 7)) & 0xf;
const b = (s[pos >> 3] >> @truncate(u3, pos)) & 0xf;
q = q.add(pcSelect(pc, b));
if (pos == 0) break;
}