48 lines
994 B
Go
48 lines
994 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 elliptic
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import (
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"math/big"
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"testing"
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)
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var toFromBigTests = []string{
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"0",
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"1",
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"23",
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"b70e0cb46bb4bf7f321390b94a03c1d356c01122343280d6105c1d21",
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"706a46d476dcb76798e6046d89474788d164c18032d268fd10704fa6",
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}
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func p224AlternativeToBig(in *p224FieldElement) *big.Int {
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ret := new(big.Int)
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tmp := new(big.Int)
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for i := uint(0); i < 8; i++ {
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tmp.SetInt64(int64(in[i]))
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tmp.Lsh(tmp, 28*i)
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ret.Add(ret, tmp)
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}
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ret.Mod(ret, p224.P)
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return ret
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}
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func TestToFromBig(t *testing.T) {
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for i, test := range toFromBigTests {
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n, _ := new(big.Int).SetString(test, 16)
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var x p224FieldElement
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p224FromBig(&x, n)
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m := p224ToBig(&x)
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if n.Cmp(m) != 0 {
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t.Errorf("#%d: %x != %x", i, n, m)
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}
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q := p224AlternativeToBig(&x)
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if n.Cmp(q) != 0 {
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t.Errorf("#%d: %x != %x (alternative)", i, n, m)
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}
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}
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}
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