-
Notifications
You must be signed in to change notification settings - Fork 12
/
TOTP.java
254 lines (216 loc) · 8.78 KB
/
TOTP.java
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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
package org.wyf.otp;
/**
Copyright (c) 2011 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, is permitted pursuant to, and subject to the license
terms contained in, the Simplified BSD License set forth in Section
4.c of the IETF Trust's Legal Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).
*/
// the code is copy from https://tools.ietf.org/html/rfc6238
import java.lang.reflect.UndeclaredThrowableException;
import java.security.GeneralSecurityException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.util.TimeZone;
/**
* This is an example implementation of the OATH
* TOTP algorithm.
* Visit www.openauthentication.org for more information.
*
* @author Johan Rydell, PortWise, Inc.
*/
public class TOTP {
private TOTP() {}
/**
* This method uses the JCE to provide the crypto algorithm.
* HMAC computes a Hashed Message Authentication Code with the
* crypto hash algorithm as a parameter.
*
* @param crypto: the crypto algorithm (HmacSHA1, HmacSHA256,
* HmacSHA512)
* @param keyBytes: the bytes to use for the HMAC key
* @param text: the message or text to be authenticated
*/
private static byte[] hmac_sha(String crypto, byte[] keyBytes,
byte[] text){
try {
Mac hmac;
hmac = Mac.getInstance(crypto);
SecretKeySpec macKey =
new SecretKeySpec(keyBytes, "RAW");
hmac.init(macKey);
return hmac.doFinal(text);
} catch (GeneralSecurityException gse) {
throw new UndeclaredThrowableException(gse);
}
}
/**
* This method converts a HEX string to Byte[]
*
* @param hex: the HEX string
*
* @return: a byte array
*/
private static byte[] hexStr2Bytes(String hex){
// Adding one byte to get the right conversion
// Values starting with "0" can be converted
byte[] bArray = new BigInteger("10" + hex,16).toByteArray();
// Copy all the REAL bytes, not the "first"
byte[] ret = new byte[bArray.length - 1];
for (int i = 0; i < ret.length; i++)
ret[i] = bArray[i+1];
return ret;
}
private static final int[] DIGITS_POWER
// 0 1 2 3 4 5 6 7 8
= {1,10,100,1000,10000,100000,1000000,10000000,100000000 };
/**
* This method generates a TOTP value for the given
* set of parameters.
*
* @param key: the shared secret, HEX encoded
* @param time: a value that reflects a time
* @param returnDigits: number of digits to return
*
* @return: a numeric String in base 10 that includes
* {@link truncationDigits} digits
*/
public static String generateTOTP(String key,
String time,
String returnDigits){
return generateTOTP(key, time, returnDigits, "HmacSHA1");
}
/**
* This method generates a TOTP value for the given
* set of parameters.
*
* @param key: the shared secret, HEX encoded
* @param time: a value that reflects a time
* @param returnDigits: number of digits to return
*
* @return: a numeric String in base 10 that includes
* {@link truncationDigits} digits
*/
public static String generateTOTP256(String key,
String time,
String returnDigits){
return generateTOTP(key, time, returnDigits, "HmacSHA256");
}
/**
* This method generates a TOTP value for the given
* set of parameters.
*
* @param key: the shared secret, HEX encoded
* @param time: a value that reflects a time
* @param returnDigits: number of digits to return
*
* @return: a numeric String in base 10 that includes
* {@link truncationDigits} digits
*/
public static String generateTOTP512(String key,
String time,
String returnDigits){
return generateTOTP(key, time, returnDigits, "HmacSHA512");
}
/**
* This method generates a TOTP value for the given
* set of parameters.
*
* @param key: the shared secret, HEX encoded
* @param time: a value that reflects a time
* @param returnDigits: number of digits to return
* @param crypto: the crypto function to use
*
* @return: a numeric String in base 10 that includes
* {@link truncationDigits} digits
*/
public static String generateTOTP(String key,
String time,
String returnDigits,
String crypto){
int codeDigits = Integer.decode(returnDigits).intValue();
String result = null;
// Using the counter
// First 8 bytes are for the movingFactor
// Compliant with base RFC 4226 (HOTP)
while (time.length() < 16 )
time = "0" + time;
// Get the HEX in a Byte[]
byte[] msg = hexStr2Bytes(time);
byte[] k = hexStr2Bytes(key);
byte[] hash = hmac_sha(crypto, k, msg);
// put selected bytes into result int
int offset = hash[hash.length - 1] & 0xf;
int binary =
((hash[offset] & 0x7f) << 24) |
((hash[offset + 1] & 0xff) << 16) |
((hash[offset + 2] & 0xff) << 8) |
(hash[offset + 3] & 0xff);
int otp = binary % DIGITS_POWER[codeDigits];
result = Integer.toString(otp);
while (result.length() < codeDigits) {
result = "0" + result;
}
return result;
}
public static void main(String[] args) {
// Seed for HMAC-SHA1 - 20 bytes
String seed = "3132333435363738393031323334353637383930";
// Seed for HMAC-SHA256 - 32 bytes
String seed32 = "3132333435363738393031323334353637383930" +
"313233343536373839303132";
// Seed for HMAC-SHA512 - 64 bytes
String seed64 = "3132333435363738393031323334353637383930" +
"3132333435363738393031323334353637383930" +
"3132333435363738393031323334353637383930" +
"31323334";
long T0 = 0;
long X = 30;
long testTime[] = {59L, 1111111109L, 1111111111L,
1234567890L, 2000000000L, 20000000000L};
String steps = "0";
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
try {
System.out.println(
"+---------------+-----------------------+" +
"------------------+--------+--------+");
System.out.println(
"| Time(sec) | Time (UTC format) " +
"| Value of T(Hex) | TOTP | Mode |");
System.out.println(
"+---------------+-----------------------+" +
"------------------+--------+--------+");
for (int i=0; i<testTime.length; i++) {
long T = (testTime[i] - T0)/X;
steps = Long.toHexString(T).toUpperCase();
while (steps.length() < 16) steps = "0" + steps;
String fmtTime = String.format("%1$-11s", testTime[i]);
String utcTime = df.format(new Date(testTime[i]*1000));
System.out.print("| " + fmtTime + " | " + utcTime +
" | " + steps + " |");
System.out.println(generateTOTP(seed, steps, "8",
"HmacSHA1") + "| SHA1 |");
System.out.print("| " + fmtTime + " | " + utcTime +
" | " + steps + " |");
System.out.println(generateTOTP(seed32, steps, "8",
"HmacSHA256") + "| SHA256 |");
System.out.print("| " + fmtTime + " | " + utcTime +
" | " + steps + " |");
System.out.println(generateTOTP(seed64, steps, "8",
"HmacSHA512") + "| SHA512 |");
System.out.println(
"+---------------+-----------------------+" +
"------------------+--------+--------+");
}
}catch (final Exception e){
System.out.println("Error : " + e);
}
}
}