1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4517355
* @summary Verify that AES cipher.doFinal method does NOT need more
* than necessary bytes in decrypt mode
* @author Valerie Peng
* @key randomness
*/
import java.io.PrintStream;
import java.security.*;
import java.security.spec.*;
import java.util.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.Provider;
public class Test4517355 {
private static final String ALGO = "AES";
private static final int KEYSIZE = 16; // in bytes
private static byte[] plainText = new byte[125];
public void execute(String mode, String padding) throws Exception {
String transformation = ALGO + "/" + mode + "/" + padding;
Cipher ci = Cipher.getInstance(transformation, "SunJCE");
KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
kg.init(KEYSIZE*8);
SecretKey key = kg.generateKey();
// TEST FIX 4517355
ci.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = ci.doFinal(plainText);
if (mode.equalsIgnoreCase("GCM")) {
AlgorithmParameters params = ci.getParameters();
ci.init(Cipher.DECRYPT_MODE, key, params);
} else {
byte[] iv = ci.getIV();
AlgorithmParameterSpec aps = new IvParameterSpec(iv);
ci.init(Cipher.DECRYPT_MODE, key, aps);
}
byte[] recoveredText = new byte[plainText.length];
try {
int len = ci.doFinal(cipherText, 0, cipherText.length,
recoveredText);
} catch (ShortBufferException ex) {
throw new Exception("output buffer is the right size!");
}
// BONUS TESTS
// 1. make sure the recoveredText is the same as the plainText
if (!Arrays.equals(plainText, recoveredText)) {
throw new Exception("encryption/decryption does not work!");
}
// 2. make sure encryption does happen
if (Arrays.equals(plainText, cipherText)) {
throw new Exception("encryption does not work!");
}
// 3. make sure padding is working
if (padding.equalsIgnoreCase("PKCS5Padding")) {
if ((cipherText.length/16)*16 != cipherText.length) {
throw new Exception("padding does not work!");
}
}
System.out.println(transformation + ": Passed");
}
public static void main (String[] args) throws Exception {
Test4517355 test = new Test4517355();
Random rdm = new Random();
rdm.nextBytes(test.plainText);
test.execute("CBC", "PKCS5Padding");
test.execute("GCM", "NoPadding");
}
}
|
