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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
package org.uic.barcode.utils;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.Provider.Service;
import java.security.PublicKey;
import java.security.Security;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* The Class SecurityUtils.
*/
public class SecurityUtils {
/**
* Find provider by public key.
*
* @param algorithmOid the algorithm oid used to generate the key
* @param keyBytes the encoded bytes of the public key
* @return the provider
*/
public static Provider findPublicKeyProvider(String keyAlgorithmOid, byte[] keyBytes) {
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
PublicKey key = ECKeyEncoder.fromEncoded(keyBytes, keyAlgorithmOid, provider);
if (key != null) return provider;
} catch (Exception e1) {
//try next
}
}
return null;
}
/**
* Find private key provider.
*
* @param key the private key
* @return the provider
*/
public static Provider findPrivateKeyProvider(PrivateKey key) {
String name = key.getAlgorithm();
byte[] keyBytes = key.getEncoded();
if (keyBytes == null || keyBytes.length == 0) {
return null;
}
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = null;
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
keyFactory = KeyFactory.getInstance(name,provider);
} catch (NoSuchAlgorithmException e1) {
//try next
}
if (keyFactory != null) {
try {
keyFactory.generatePrivate(keySpec);
return provider;
} catch (Exception e) {
provider = null;
//try next
}
}
}
return null;
}
/**
* Convert.
*
* @param key the key
* @param provider the provider
* @return the public key
*/
public static PublicKey convert(PublicKey key, Provider provider) {
PublicKey publicKey;
KeyFactory keyFactory = null;
try {
if (key.getAlgorithm() != null && key.getAlgorithm().toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else if (key.getAlgorithm() != null && key.getAlgorithm().length() > 0 ) {
keyFactory = KeyFactory.getInstance("DSA",provider);
} else {
return key;
}
publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(key.getEncoded()));
} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
return key;
}
return publicKey;
}
/**
* Convert.
*
* @param key the key
* @param provider the provider
* @return the private key
*/
public static PrivateKey convert(PrivateKey key, Provider provider) {
PrivateKey privateKey;
KeyFactory keyFactory = null;
try {
if (key.getAlgorithm() != null && key.getAlgorithm().toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else if (key.getAlgorithm() != null && key.getAlgorithm().length() > 0 ) {
keyFactory = KeyFactory.getInstance("DSA",provider);
} else {
return key;
}
privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(key.getEncoded()));
} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
return key;
}
return privateKey;
}
/**
* Find signature provider.
*
* @param encoded the encoded
* @param oid the oid
* @return the provider
*/
public static Provider findSignatureProvider(byte[] encoded, String oid) {
KeyFactory keyFactory = null;
String signatureAlgorithmName = null;
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
Service service = provider.getService(AlgorithmNameResolver.TYPE_SIGNATURE_ALG, oid);
if (service != null) {
signatureAlgorithmName = service.getAlgorithm();
if (signatureAlgorithmName != null && signatureAlgorithmName.length() > 0) {
if (signatureAlgorithmName.toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else {
keyFactory = KeyFactory.getInstance("DSA",provider);
}
if (keyFactory != null) {
X509EncodedKeySpec spec = new X509EncodedKeySpec(encoded);
//try to encode the key
keyFactory.generatePublic(spec);
}
}
}
} catch (Exception e1) {
keyFactory = null;
}
if (keyFactory != null) {
return keyFactory.getProvider();
}
}
return null;
}
}
|
