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// Copyright 2011 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 packet
import (
"bytes"
"crypto/openpgp/error"
"crypto/sha1"
"encoding/hex"
"io/ioutil"
"os"
"testing"
)
// TestReader wraps a []byte and returns reads of a specific length.
type testReader struct {
data []byte
stride int
}
func (t *testReader) Read(buf []byte) (n int, err os.Error) {
n = t.stride
if n > len(t.data) {
n = len(t.data)
}
if n > len(buf) {
n = len(buf)
}
copy(buf, t.data)
t.data = t.data[n:]
if len(t.data) == 0 {
err = os.EOF
}
return
}
func testMDCReader(t *testing.T) {
mdcPlaintext, _ := hex.DecodeString(mdcPlaintextHex)
for stride := 1; stride < len(mdcPlaintext)/2; stride++ {
r := &testReader{data: mdcPlaintext, stride: stride}
mdcReader := &seMDCReader{in: r, h: sha1.New()}
body, err := ioutil.ReadAll(mdcReader)
if err != nil {
t.Errorf("stride: %d, error: %s", stride, err)
continue
}
if !bytes.Equal(body, mdcPlaintext[:len(mdcPlaintext)-22]) {
t.Errorf("stride: %d: bad contents %x", stride, body)
continue
}
err = mdcReader.Close()
if err != nil {
t.Errorf("stride: %d, error on Close: %s", stride, err)
}
}
mdcPlaintext[15] ^= 80
r := &testReader{data: mdcPlaintext, stride: 2}
mdcReader := &seMDCReader{in: r, h: sha1.New()}
_, err := ioutil.ReadAll(mdcReader)
if err != nil {
t.Errorf("corruption test, error: %s", err)
return
}
err = mdcReader.Close()
if err == nil {
t.Error("corruption: no error")
} else if _, ok := err.(*error.SignatureError); !ok {
t.Errorf("corruption: expected SignatureError, got: %s", err)
}
}
const mdcPlaintextHex = "a302789c3b2d93c4e0eb9aba22283539b3203335af44a134afb800c849cb4c4de10200aff40b45d31432c80cb384299a0655966d6939dfdeed1dddf980"
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