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// Copyright 2009 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.

package subtle

import (
        "testing"
        "testing/quick"
)

type TestConstantTimeCompareStruct struct {
        a, b []byte
        out  int
}

var testConstantTimeCompareData = []TestConstantTimeCompareStruct{
        {[]byte{}, []byte{}, 1},
        {[]byte{0x11}, []byte{0x11}, 1},
        {[]byte{0x12}, []byte{0x11}, 0},
}

func TestConstantTimeCompare(t *testing.T) {
        for i, test := range testConstantTimeCompareData {
                if r := ConstantTimeCompare(test.a, test.b); r != test.out {
                        t.Errorf("#%d bad result (got %x, want %x)", i, r, test.out)
                }
        }
}

type TestConstantTimeByteEqStruct struct {
        a, b uint8
        out  int
}

var testConstandTimeByteEqData = []TestConstantTimeByteEqStruct{
        {0, 0, 1},
        {0, 1, 0},
        {1, 0, 0},
        {0xff, 0xff, 1},
        {0xff, 0xfe, 0},
}

func byteEq(a, b uint8) int {
        if a == b {
                return 1
        }
        return 0
}

func TestConstantTimeByteEq(t *testing.T) {
        for i, test := range testConstandTimeByteEqData {
                if r := ConstantTimeByteEq(test.a, test.b); r != test.out {
                        t.Errorf("#%d bad result (got %x, want %x)", i, r, test.out)
                }
        }
        err := quick.CheckEqual(ConstantTimeByteEq, byteEq, nil)
        if err != nil {
                t.Error(err)
        }
}

func eq(a, b int32) int {
        if a == b {
                return 1
        }
        return 0
}

func TestConstantTimeEq(t *testing.T) {
        err := quick.CheckEqual(ConstantTimeEq, eq, nil)
        if err != nil {
                t.Error(err)
        }
}

func makeCopy(v int, x, y []byte) []byte {
        if len(x) > len(y) {
                x = x[0:len(y)]
        } else {
                y = y[0:len(x)]
        }
        if v == 1 {
                copy(x, y)
        }
        return x
}

func constantTimeCopyWrapper(v int, x, y []byte) []byte {
        if len(x) > len(y) {
                x = x[0:len(y)]
        } else {
                y = y[0:len(x)]
        }
        v &= 1
        ConstantTimeCopy(v, x, y)
        return x
}

func TestConstantTimeCopy(t *testing.T) {
        err := quick.CheckEqual(constantTimeCopyWrapper, makeCopy, nil)
        if err != nil {
                t.Error(err)
        }
}