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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package encoding
import (
"bytes"
"io"
"testing"
)
var mpiTests = []struct {
encoded []byte
bytes []byte
reencoded []byte
bitLength uint16
err error
}{
{
encoded: []byte{0x0, 0x0},
bytes: []byte{},
bitLength: 0,
},
{
encoded: []byte{0x0, 0x1, 0x1},
bytes: []byte{0x1},
bitLength: 1,
},
{
encoded: []byte{0x0, 0x9, 0x1, 0xff},
bytes: []byte{0x1, 0xff},
bitLength: 9,
},
{
encoded: append([]byte{0x1, 0x0, 0xff}, make([]byte, 0x1f)...),
bytes: append([]byte{0xff}, make([]byte, 0x1f)...),
bitLength: 0x100,
},
// https://bugs.gnupg.org/gnupg/issue1853
{
encoded: []byte{0x0, 0x10, 0x0, 0x1},
bytes: []byte{0x0, 0x1},
reencoded: []byte{0x0, 0x1, 0x1},
bitLength: 0x10,
},
// EOF error,
{
encoded: []byte{},
err: io.ErrUnexpectedEOF,
},
{
encoded: []byte{0x1, 0x0, 0x0},
err: io.ErrUnexpectedEOF,
},
}
func TestMPI(t *testing.T) {
for i, test := range mpiTests {
mpi := new(MPI)
if _, err := mpi.ReadFrom(bytes.NewBuffer(test.encoded)); err != nil {
if !sameError(err, test.err) {
t.Errorf("#%d: ReadFrom error got:%q", i, err)
}
continue
}
if b := mpi.Bytes(); !bytes.Equal(b, test.bytes) {
t.Errorf("#%d: bad creation got:%x want:%x", i, b, test.bytes)
}
if bl := mpi.BitLength(); bl != test.bitLength {
t.Errorf("#%d: bad BitLength got:%d want:%d", i, bl, test.bitLength)
}
reencoded := test.encoded
if test.reencoded != nil {
reencoded = test.reencoded
}
if b := mpi.EncodedBytes(); !bytes.Equal(b, test.encoded) {
t.Errorf("#%d: bad encoding got:%x want:%x", i, b, test.encoded)
}
if b := NewMPI(mpi.Bytes()).EncodedBytes(); !bytes.Equal(b, reencoded) {
t.Errorf("#%d: bad encoding got:%x want:%x", i, b, reencoded)
}
}
}
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