package bigint import ( "bytes" "crypto/rand" "math/big" "testing" "github.com/stretchr/testify/require" ) func FuzzFromBytes(f *testing.F) { for _, tc := range testCases { f.Add(tc.buf) } for i := 0; i < 50; i++ { for j := 1; j < MaxBytesLen; j++ { b := make([]byte, j) _, err := rand.Read(b) require.NoError(f, err) f.Add(b) } } f.Fuzz(func(t *testing.T, raw []byte) { var bi *big.Int require.NotPanics(t, func() { bi = FromBytes(raw) }) var actual []byte require.NotPanics(t, func() { actual = ToBytes(bi) }) require.True(t, len(actual) <= len(raw), "actual: %x, raw: %x", actual, raw) require.True(t, bytes.Equal(actual, raw[:len(actual)]), "actual: %x, raw: %x", actual, raw) if len(actual) == len(raw) { return } var b byte if bi.Sign() == -1 { b = 0xFF } for i := len(actual); i < len(raw); i++ { require.Equal(t, b, raw[i], "invalid prefix") } newRaw := ToBytes(bi) newBi := FromBytes(newRaw) require.Equal(t, bi, newBi) }) }