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No need to keep a 128-bit carry around

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This commit is contained in:
Frank Denis 2020-08-21 20:33:16 +02:00
parent 2fc2ebd920
commit 0fe6677736
1 changed files with 2 additions and 2 deletions
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4
lib/std/crypto/poly1305.zig
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@ -64,7 +64,7 @@ pub const Poly1305 = struct {
var d2 = @as(u128, h0) * r2 + @as(u128, h1) * r1 + @as(u128, h2) * r0;
// partial reduction
var carry = d0 >> 44;
var carry = @intCast(u64, d0 >> 44);
h0 = @truncate(u44, d0);
d1 += carry;
carry = @intCast(u64, d1 >> 44);
@ -75,7 +75,7 @@ pub const Poly1305 = struct {
h0 += @truncate(u64, carry) * 5;
carry = h0 >> 44;
h0 = @truncate(u44, h0);
h1 += @truncate(u64, carry);
h1 += carry;
}
st.h = [_]u64{ h0, h1, h2 };
}