Andreas Auernhammer
cd11541cdf
Simplify the constant swap function. On amd64: Replace the CMOVQEQ scheme with SSE2 code similar to the non-amd64 code. On non-amd64: Avoid unnecessary loop iterations. The result is less and slightly faster code. name old time/op new time/op delta ScalarBaseMult-4 653µs ± 0% 636µs ± 0% ~ (p=0.100 n=3+3) name old time/op new time/op delta ConstantSwap-4 10.4ns ± 1% 6.2ns ± 0% -39.86% (p=0.029 n=4+4) On an i7-65000U Change-Id: Ia5eea92e0b3eabb6c291d25229aa582b51278552 Reviewed-on: https://go-review.googlesource.com/39693 Reviewed-by: Adam Langley <agl@golang.org> Run-TryBot: Adam Langley <agl@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
40 lines
762 B
Go
40 lines
762 B
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package curve25519
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import (
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"fmt"
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"testing"
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)
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const expectedHex = "89161fde887b2b53de549af483940106ecc114d6982daa98256de23bdf77661a"
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func TestBaseScalarMult(t *testing.T) {
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var a, b [32]byte
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in := &a
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out := &b
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a[0] = 1
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for i := 0; i < 200; i++ {
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ScalarBaseMult(out, in)
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in, out = out, in
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}
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result := fmt.Sprintf("%x", in[:])
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if result != expectedHex {
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t.Errorf("incorrect result: got %s, want %s", result, expectedHex)
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}
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}
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func BenchmarkScalarBaseMult(b *testing.B) {
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var in, out [32]byte
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in[0] = 1
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b.SetBytes(32)
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for i := 0; i < b.N; i++ {
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ScalarBaseMult(&out, &in)
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}
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}
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