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- package p256
- import (
- "crypto/ecdsa"
- "crypto/elliptic"
- "crypto/rand"
- "testing"
- "github.com/stretchr/testify/require"
- )
- func TestFlipping(t *testing.T) {
- priv, err1 := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
- require.NoError(t, err1)
- out, err := ecdsa.SignASN1(rand.Reader, priv, []byte("big chungus"))
- require.NoError(t, err)
- r, s, err := parseSignature(out)
- require.NoError(t, err)
- r, s1, err := swap(r, s)
- require.NoError(t, err)
- r, s2, err := swap(r, s1)
- require.NoError(t, err)
- require.Equal(t, s, s2)
- require.NotEqual(t, s, s1)
- }
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