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// +build !cgo
package secp256k1
import (
"testing"
secp256k1 "github.com/btcsuite/btcd/btcec"
"github.com/stretchr/testify/require"
)
// Ensure that signature verification works, and that
// non-canonical signatures fail.
// Note: run with CGO_ENABLED=0 or go test -tags !cgo.
func TestSignatureVerificationAndRejectUpperS(t *testing.T) {
msg := []byte("We have lingered long enough on the shores of the cosmic ocean.")
for i := 0; i < 500; i++ {
priv := GenPrivKey()
sigStr, err := priv.Sign(msg)
require.NoError(t, err)
sig := signatureFromBytes(sigStr)
require.False(t, sig.S.Cmp(secp256k1halfN) > 0)
pub := priv.PubKey()
require.True(t, pub.VerifyBytes(msg, sigStr))
// malleate:
sig.S.Sub(secp256k1.S256().CurveParams.N, sig.S)
require.True(t, sig.S.Cmp(secp256k1halfN) > 0)
malSigStr := serializeSig(sig)
require.False(t, pub.VerifyBytes(msg, malSigStr),
"VerifyBytes incorrect with malleated & invalid S. sig=%v, key=%v",
sig,
priv,
)
}
}