Subversion Repositories openrisc

// 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)
                }
        }
}