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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* Copyright (c) 2020, 2024, 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.
*/
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.AlgorithmParameters;
import java.util.Arrays;
/*
* @test
* @summary Verify when decrypting over an existing buffer than padding does not
* overwrite past what the plaintext length is.
*
*/
public class SameBufferOverwrite {
private SecretKey skey;
private Cipher c;
private int start = 17, end = 17; // default
SameBufferOverwrite(String algo, String transformation)
throws Exception {
KeyGenerator kg = KeyGenerator.getInstance(algo,
System.getProperty("test.provider.name", "SunJCE"));
skey = kg.generateKey();
c = Cipher.getInstance(transformation,
System.getProperty("test.provider.name", "SunJCE"));
}
/*
* Run the test
*/
void test() throws Exception {
byte[] in = new byte[end + (c.getBlockSize() - (end % c.getBlockSize()))];
Arrays.fill(in, (byte)8);
int len = start;
AlgorithmParameters params = null;
System.out.println("Testing transformation: " + c.getAlgorithm() +
", byte length from " + start + " to " + end);
while (end >= len) {
// encrypt
c.init(Cipher.ENCRYPT_MODE, skey, params);
byte[] out = c.doFinal(in, 0, len);
System.out.println(" enc = " + byteToHex(out));
System.out.println(" => enc " + len + " bytes, ret " +
(out == null ? "null" : (out.length + " byte")));
// decrypt
params = c.getParameters();
c.init(Cipher.DECRYPT_MODE, skey, params);
int rLen = c.doFinal(out, 0, out.length, in);
System.out.println(" dec = " + byteToHex(in));
System.out.println(" => dec " + out.length + " bytes, ret " +
rLen + " byte");
// check if more than rLen bytes are written into 'in'
for (int j = rLen; j < in.length; j++) {
if (in[j] != (byte) 8) {
throw new Exception("Value check failed at index " + j);
}
}
System.out.println(" Test Passed: len = " + len);
len++;
// Because GCM doesn't allow params reuse
if (c.getAlgorithm().contains("GCM")) {
params = null;
}
}
}
/**
* Builder method for the test to run data lengths from the start value to
* the end value. To do one length, have start and end equal that number.
* @param start starting data length
* @param end ending data length
*/
SameBufferOverwrite iterate(int start, int end) {
this.start = start;
this.end = end;
return this;
}
public static void main(String args[]) throws Exception {
new SameBufferOverwrite("AES", "AES/GCM/NoPadding").iterate(1, 25).
test();
new SameBufferOverwrite("AES", "AES/CTR/NoPadding").iterate(1, 25).
test();
new SameBufferOverwrite("AES", "AES/CBC/PKCS5Padding").iterate(1, 25).
test();
new SameBufferOverwrite("AES", "AES/ECB/PKCS5Padding").iterate(1, 25).
test();
new SameBufferOverwrite("DES", "DES/CBC/PKCS5Padding").iterate(1, 17).
test();
new SameBufferOverwrite("DESede", "DESede/CBC/PKCS5Padding").iterate(1, 17).
test();
}
private static String byteToHex(byte[] barray) {
StringBuilder s = new StringBuilder();
for (byte b : barray) {
s.append(String.format("%02x", b));
}
return s.toString();
}
}
|
