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// Copyright 2012 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 elliptic

import (

        "math/big"

        "testing"

)

var toFromBigTests = []string{

        "0",

        "1",

        "23",

        "b70e0cb46bb4bf7f321390b94a03c1d356c01122343280d6105c1d21",

        "706a46d476dcb76798e6046d89474788d164c18032d268fd10704fa6",

}

func p224AlternativeToBig(in *p224FieldElement) *big.Int {

        ret := new(big.Int)

        tmp := new(big.Int)

        for i := uint(0); i < 8; i++ {

                tmp.SetInt64(int64(in[i]))

                tmp.Lsh(tmp, 28*i)

                ret.Add(ret, tmp)

        }

        ret.Mod(ret, p224.P)

        return ret

}

func TestToFromBig(t *testing.T) {

        for i, test := range toFromBigTests {

                n, _ := new(big.Int).SetString(test, 16)

                var x p224FieldElement

                p224FromBig(&x, n)

                m := p224ToBig(&x)

                if n.Cmp(m) != 0 {

                        t.Errorf("#%d: %x != %x", i, n, m)

                }

                q := p224AlternativeToBig(&x)

                if n.Cmp(q) != 0 {

                        t.Errorf("#%d: %x != %x (alternative)", i, n, m)

                }

        }

}