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