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
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* Copyright (c) 2016, 2018, 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 8161571 8178370
* @summary Reject signatures presented for verification that contain extra
* bytes.
* @modules jdk.crypto.ec
* @run main SignatureLength
*/
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Security;
import java.security.Signature;
import java.security.SignatureException;
public class SignatureLength {
public static void main(String[] args) throws Exception {
for (Provider p0 : Security.getProviders()) {
for (Provider p1 : Security.getProviders()) {
for (Provider p2 : Security.getProviders()) {
// SunMSCAPI signer can only be initialized with
// a key generated with SunMSCAPI
if (!p0.getName().equals("SunMSCAPI")
&& p1.getName().equals("SunMSCAPI")) continue;
// SunMSCAPI generated key can only be signed
// with SunMSCAPI signer
if (p0.getName().equals("SunMSCAPI")
&& !p1.getName().equals("SunMSCAPI")) continue;
// SunMSCAPI and SunPKCS11 verifiers may return false
// instead of throwing SignatureException
boolean mayNotThrow = p2.getName().equals("SunMSCAPI")
|| p2.getName().startsWith("SunPKCS11");
main0("EC", 256, "SHA256withECDSA", p0, p1, p2, mayNotThrow);
main0("RSA", 2048, "SHA256withRSA", p0, p1, p2, mayNotThrow);
main0("DSA", 2048, "SHA256withDSA", p0, p1, p2, mayNotThrow);
}
}
}
}
private static void main0(String keyAlgorithm, int keysize,
String signatureAlgorithm, Provider generatorProvider,
Provider signerProvider, Provider verifierProvider,
boolean mayNotThrow) throws Exception {
KeyPairGenerator generator;
Signature signer;
Signature verifier;
try {
generator = KeyPairGenerator.getInstance(keyAlgorithm,
generatorProvider);
signer = Signature.getInstance(signatureAlgorithm,
signerProvider);
verifier = Signature.getInstance(signatureAlgorithm,
verifierProvider);
} catch (NoSuchAlgorithmException nsae) {
// ignore this set of providers
return;
}
byte[] plaintext = "aaa".getBytes("UTF-8");
// Generate
generator.initialize(keysize);
System.out.println("Generating " + keyAlgorithm + " keypair using " +
generator.getProvider().getName() + " JCE provider");
KeyPair keypair = generator.generateKeyPair();
// Sign
signer.initSign(keypair.getPrivate());
signer.update(plaintext);
System.out.println("Signing using " + signer.getProvider().getName() +
" JCE provider");
byte[] signature = signer.sign();
// Invalidate
System.out.println("Invalidating signature ...");
byte[] badSignature = new byte[signature.length + 5];
System.arraycopy(signature, 0, badSignature, 0, signature.length);
badSignature[signature.length] = 0x01;
badSignature[signature.length + 1] = 0x01;
badSignature[signature.length + 2] = 0x01;
badSignature[signature.length + 3] = 0x01;
badSignature[signature.length + 4] = 0x01;
// Verify
verifier.initVerify(keypair.getPublic());
verifier.update(plaintext);
System.out.println("Verifying using " +
verifier.getProvider().getName() + " JCE provider");
try {
boolean valid = verifier.verify(badSignature);
System.out.println("Valid? " + valid);
if (mayNotThrow) {
if (valid) {
throw new Exception(
"ERROR: expected a SignatureException but none was thrown"
+ " and invalid signature was verified");
} else {
System.out.println("OK: verification failed as expected");
}
} else {
throw new Exception(
"ERROR: expected a SignatureException but none was thrown");
}
} catch (SignatureException e) {
System.out.println("OK: caught expected exception: " + e);
}
System.out.println();
}
}
|
