issue21104_test.go

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package crypto_test
     6  
     7  import (
     8  	"crypto/aes"
     9  	"crypto/cipher"
    10  	"crypto/rc4"
    11  	"testing"
    12  )
    13  
    14  func TestRC4OutOfBoundsWrite(t *testing.T) {
    15  	// This cipherText is encrypted "0123456789"
    16  	cipherText := []byte{238, 41, 187, 114, 151, 2, 107, 13, 178, 63}
    17  	cipher, err := rc4.NewCipher([]byte{0})
    18  	if err != nil {
    19  		panic(err)
    20  	}
    21  	test(t, "RC4", cipherText, cipher.XORKeyStream)
    22  }
    23  func TestCTROutOfBoundsWrite(t *testing.T) {
    24  	testBlock(t, "CTR", cipher.NewCTR)
    25  }
    26  func TestOFBOutOfBoundsWrite(t *testing.T) {
    27  	testBlock(t, "OFB", cipher.NewOFB)
    28  }
    29  func TestCFBEncryptOutOfBoundsWrite(t *testing.T) {
    30  	testBlock(t, "CFB Encrypt", cipher.NewCFBEncrypter)
    31  }
    32  func TestCFBDecryptOutOfBoundsWrite(t *testing.T) {
    33  	testBlock(t, "CFB Decrypt", cipher.NewCFBDecrypter)
    34  }
    35  func testBlock(t *testing.T, name string, newCipher func(cipher.Block, []byte) cipher.Stream) {
    36  	// This cipherText is encrypted "0123456789"
    37  	cipherText := []byte{86, 216, 121, 231, 219, 191, 26, 12, 176, 117}
    38  	var iv, key [16]byte
    39  	block, err := aes.NewCipher(key[:])
    40  	if err != nil {
    41  		panic(err)
    42  	}
    43  	stream := newCipher(block, iv[:])
    44  	test(t, name, cipherText, stream.XORKeyStream)
    45  }
    46  func test(t *testing.T, name string, cipherText []byte, xor func([]byte, []byte)) {
    47  	want := "abcdefghij"
    48  	plainText := []byte(want)
    49  	shorterLen := len(cipherText) / 2
    50  	defer func() {
    51  		err := recover()
    52  		if err == nil {
    53  			t.Errorf("%v XORKeyStream expected to panic on len(dst) < len(src), but didn't", name)
    54  		}
    55  		const plain = "0123456789"
    56  		if plainText[shorterLen] == plain[shorterLen] {
    57  			t.Errorf("%v XORKeyStream did out of bounds write, want %v, got %v", name, want, string(plainText))
    58  		}
    59  	}()
    60  	xor(plainText[:shorterLen], cipherText)
    61  }
    62
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