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74 lines
1.9 KiB
74 lines
1.9 KiB
package secp256k1
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import (
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"bytes"
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"math/big"
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"testing"
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"github.com/stretchr/testify/require"
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secp256k1 "github.com/btcsuite/btcd/btcec"
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)
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func Test_genPrivKey(t *testing.T) {
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empty := make([]byte, 32)
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oneB := big.NewInt(1).Bytes()
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onePadded := make([]byte, 32)
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copy(onePadded[32-len(oneB):32], oneB)
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t.Logf("one padded: %v, len=%v", onePadded, len(onePadded))
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validOne := append(empty, onePadded...)
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tests := []struct {
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name string
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notSoRand []byte
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shouldPanic bool
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}{
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{"empty bytes (panics because 1st 32 bytes are zero and 0 is not a valid field element)", empty, true},
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{"curve order: N", secp256k1.S256().N.Bytes(), true},
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{"valid because 0 < 1 < N", validOne, false},
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}
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for _, tt := range tests {
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tt := tt
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t.Run(tt.name, func(t *testing.T) {
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if tt.shouldPanic {
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require.Panics(t, func() {
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genPrivKey(bytes.NewReader(tt.notSoRand))
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})
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return
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}
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got := genPrivKey(bytes.NewReader(tt.notSoRand))
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fe := new(big.Int).SetBytes(got[:])
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require.True(t, fe.Cmp(secp256k1.S256().N) < 0)
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require.True(t, fe.Sign() > 0)
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})
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}
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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.VerifySignature(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.VerifySignature(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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