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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 crypto
- import (
- "crypto/aes"
- "crypto/cipher"
- "crypto/rc4"
- "testing"
- )
- func TestRC4OutOfBoundsWrite(t *testing.T) {
- // This cipherText is encrypted "0123456789"
- cipherText := []byte{238, 41, 187, 114, 151, 2, 107, 13, 178, 63}
- cipher, err := rc4.NewCipher([]byte{0})
- if err != nil {
- panic(err)
- }
- test(t, "RC4", cipherText, cipher.XORKeyStream)
- }
- func TestCTROutOfBoundsWrite(t *testing.T) {
- testBlock(t, "CTR", cipher.NewCTR)
- }
- func TestOFBOutOfBoundsWrite(t *testing.T) {
- testBlock(t, "OFB", cipher.NewOFB)
- }
- func TestCFBEncryptOutOfBoundsWrite(t *testing.T) {
- testBlock(t, "CFB Encrypt", cipher.NewCFBEncrypter)
- }
- func TestCFBDecryptOutOfBoundsWrite(t *testing.T) {
- testBlock(t, "CFB Decrypt", cipher.NewCFBDecrypter)
- }
- func testBlock(t *testing.T, name string, newCipher func(cipher.Block, []byte) cipher.Stream) {
- // This cipherText is encrypted "0123456789"
- cipherText := []byte{86, 216, 121, 231, 219, 191, 26, 12, 176, 117}
- var iv, key [16]byte
- block, err := aes.NewCipher(key[:])
- if err != nil {
- panic(err)
- }
- stream := newCipher(block, iv[:])
- test(t, name, cipherText, stream.XORKeyStream)
- }
- func test(t *testing.T, name string, cipherText []byte, xor func([]byte, []byte)) {
- want := "abcdefghij"
- plainText := []byte(want)
- shorterLen := len(cipherText) / 2
- defer func() {
- err := recover()
- if err == nil {
- t.Errorf("%v XORKeyStream expected to panic on len(dst) < len(src), but didn't", name)
- }
- const plain = "0123456789"
- if plainText[shorterLen] == plain[shorterLen] {
- t.Errorf("%v XORKeyStream did out of bounds write, want %v, got %v", name, want, string(plainText))
- }
- }()
- xor(plainText[:shorterLen], cipherText)
- }
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