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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build amd64 && !purego && gc
package salsa
import (
"bytes"
"testing"
)
func TestCounterOverflow(t *testing.T) {
in := make([]byte, 4096)
key := &[32]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}
for n, counter := range []*[16]byte{
&[16]byte{0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0}, // zero counter
&[16]byte{0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff}, // counter about to overflow 32 bits
&[16]byte{0, 1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 0xff, 0xff, 0xff, 0xff}, // counter above 32 bits
} {
out := make([]byte, 4096)
XORKeyStream(out, in, counter, key)
outGeneric := make([]byte, 4096)
genericXORKeyStream(outGeneric, in, counter, key)
if !bytes.Equal(out, outGeneric) {
t.Errorf("%d: assembly and go implementations disagree", n)
}
}
}
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