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
|
/*
* Copyright 2016 OpenMarket Ltd
* Copyright 2016 Vector Creations Ltd
*
* 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 org.matrix.olm;
import android.text.TextUtils;
import android.util.Log;
import java.util.Random;
/**
* Olm SDK helper class.
*/
public class OlmUtility {
private static final String LOG_TAG = "OlmUtility";
public static final int RANDOM_KEY_SIZE = 32;
public static final int RANDOM_RANGE = 256;
/** Instance Id returned by JNI.
* This value uniquely identifies this utility instance.
**/
private long mNativeId;
public OlmUtility() {
initUtility();
}
/**
* Create a native utility instance.
* To be called before any other API call.
* @return true if init succeed, false otherwise.
*/
private boolean initUtility() {
mNativeId = initUtilityJni();
return (0 != mNativeId);
}
private native long initUtilityJni();
/**
* Release native instance.<br>
* Public API for {@link #releaseUtilityJni()}.
*/
public void releaseUtility(){
releaseUtilityJni();
mNativeId = 0;
}
private native void releaseUtilityJni();
/**
* Verify an ed25519 signature.<br>
* If the signature is verified, the method returns true. If false is returned, an error description is provided in aError.
* If the key was too small, aError is set to "OLM.INVALID_BASE64".
* If the signature was invalid, aError is set to "OLM.BAD_MESSAGE_MAC".<br>
* @param aSignature the base64-encoded message signature to be checked.
* @param aFingerprintKey the ed25519 key (fingerprint key)
* @param aMessage the signed message
* @param aError error message description
* @return true if the signature is verified, false otherwise
*/
public boolean verifyEd25519Signature(String aSignature, String aFingerprintKey, String aMessage, StringBuffer aError) {
boolean retCode = false;
String jniError;
if (null == aError) {
Log.e(LOG_TAG, "## verifyEd25519Signature(): invalid input error parameter");
} else {
aError.setLength(0);
if (TextUtils.isEmpty(aSignature) || TextUtils.isEmpty(aFingerprintKey) || TextUtils.isEmpty(aMessage)) {
Log.e(LOG_TAG, "## verifyEd25519Signature(): invalid input parameters");
aError.append("JAVA sanity check failure - invalid input parameters");
} else if (null == (jniError = verifyEd25519SignatureJni(aSignature, aFingerprintKey, aMessage))) {
retCode = true;
} else {
aError.append(jniError);
}
}
return retCode;
}
/**
* Verify an ed25519 signature.
* Return a human readable error message in case of verification failure.
* @param aSignature the base64-encoded message signature to be checked.
* @param aFingerprintKey the ed25519 key
* @param aMessage the signed message
* @return null if validation succeed, the error message string if operation failed
*/
private native String verifyEd25519SignatureJni(String aSignature, String aFingerprintKey, String aMessage);
/**
* Compute the hash(SHA-256) value of the string given in parameter(aMessageToHash).<br>
* The hash value is the returned by the method.
* @param aMessageToHash message to be hashed
* @return hash value if operation succeed, null otherwise
*/
public String sha256(String aMessageToHash) {
String hashRetValue = null;
if(null != aMessageToHash){
hashRetValue = sha256Jni(aMessageToHash);
}
return hashRetValue;
}
private native String sha256Jni(String aMessage);
/**
* Helper method to compute a string based on random integers.
* @return string containing randoms integer values
*/
public static String getRandomKey() {
String keyRetValue;
Random rand = new Random();
StringBuilder strBuilder = new StringBuilder();
for(int i = 0; i< RANDOM_KEY_SIZE; i++) {
strBuilder.append(rand.nextInt(RANDOM_RANGE));
}
keyRetValue = strBuilder.toString();
return keyRetValue;
}
/**
* Return true the object resources have been released.<br>
* @return true the object resources have been released
*/
public boolean isReleased() {
return (0 == mNativeId);
}
}
|
