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
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security;
import android.os.Environment;
import android.os.FileUtils;
import android.os.Process;
import org.apache.harmony.luni.util.InputStreamHelper;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
/**
*@hide
*/
public class SystemKeyStore {
private static final String SYSTEM_KEYSTORE_DIRECTORY = "misc/systemkeys";
private static final String KEY_FILE_EXTENSION = ".sks";
private static SystemKeyStore mInstance = new SystemKeyStore();
private SystemKeyStore() { }
public static SystemKeyStore getInstance() {
return mInstance;
}
public static String toHexString(byte[] keyData) {
if (keyData == null) {
return null;
}
int keyLen = keyData.length;
int expectedStringLen = keyData.length * 2;
StringBuilder sb = new StringBuilder(expectedStringLen);
for (int i = 0; i < keyData.length; i++) {
String hexStr = Integer.toString(keyData[i] & 0x00FF, 16);
if (hexStr.length() == 1) {
hexStr = "0" + hexStr;
}
sb.append(hexStr);
}
return sb.toString();
}
public String generateNewKeyHexString(int numBits, String algName, String keyName)
throws NoSuchAlgorithmException {
return toHexString(generateNewKey(numBits, algName, keyName));
}
public byte[] generateNewKey(int numBits, String algName, String keyName)
throws NoSuchAlgorithmException {
// Check if key with similar name exists. If so, return null.
File keyFile = getKeyFile(keyName);
if (keyFile.exists()) {
throw new IllegalArgumentException();
}
KeyGenerator skg = KeyGenerator.getInstance(algName);
SecureRandom srng = SecureRandom.getInstance("SHA1PRNG");
skg.init(numBits, srng);
SecretKey sk = skg.generateKey();
byte[] retKey = sk.getEncoded();
try {
// Store the key
if (!keyFile.createNewFile()) {
throw new IllegalArgumentException();
}
FileOutputStream fos = new FileOutputStream(keyFile);
fos.write(retKey);
fos.flush();
FileUtils.sync(fos);
fos.close();
FileUtils.setPermissions(keyFile.getName(), (FileUtils.S_IRUSR | FileUtils.S_IWUSR),
-1, -1);
} catch (IOException ioe) {
return null;
}
return retKey;
}
private File getKeyFile(String keyName) {
File sysKeystoreDir = new File(Environment.getDataDirectory(),
SYSTEM_KEYSTORE_DIRECTORY);
File keyFile = new File(sysKeystoreDir, keyName + KEY_FILE_EXTENSION);
return keyFile;
}
public String retrieveKeyHexString(String keyName) throws IOException {
return toHexString(retrieveKey(keyName));
}
public byte[] retrieveKey(String keyName) throws IOException {
File keyFile = getKeyFile(keyName);
if (!keyFile.exists()) {
return null;
}
FileInputStream fis = new FileInputStream(keyFile);
return InputStreamHelper.readFullyAndClose(fis);
}
public void deleteKey(String keyName) {
// Get the file first.
File keyFile = getKeyFile(keyName);
if (!keyFile.exists()) {
throw new IllegalArgumentException();
}
keyFile.delete();
}
}
|
