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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
package sm2ec_test
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import (
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"bytes"
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"crypto/rand"
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"encoding/hex"
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"io"
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"math/big"
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"testing"
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"github.com/emmansun/gmsm/internal/sm2ec"
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)
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func randomK(r io.Reader, ord *big.Int) (k *big.Int, err error) {
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for {
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k, err = rand.Int(r, ord)
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if err != nil || (k.Sign() > 0 && len(k.Bytes()) == 32) {
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return
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}
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}
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}
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func TestImplicitSig(t *testing.T) {
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n, _ := new(big.Int).SetString("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", 16)
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sPriv, err := randomK(rand.Reader, n)
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if err != nil {
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t.Fatal(err)
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}
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ePriv, err := randomK(rand.Reader, n)
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if err != nil {
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t.Fatal(err)
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}
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k, err := randomK(rand.Reader, n)
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if err != nil {
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t.Fatal(err)
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}
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res1, err := sm2ec.ImplicitSig(sPriv.Bytes(), ePriv.Bytes(), k.Bytes())
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if err != nil {
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t.Fatal(err)
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}
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res2 := new(big.Int)
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res2.Mul(ePriv, k)
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res2.Add(res2, sPriv)
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res2.Mod(res2, n)
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if !bytes.Equal(new(big.Int).SetBytes(res1).Bytes(), res2.Bytes()) {
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t.Errorf("expected %s, got %s", hex.EncodeToString(res1), hex.EncodeToString(res2.Bytes()))
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}
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}
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