|
1
14 package org.compiere.util;
15
16 import java.security.AlgorithmParameters  ;
17 import java.security.MessageDigest ;
18 import java.security.NoSuchAlgorithmException ;
19
20 import javax.crypto.Cipher;
21 import javax.crypto.KeyGenerator;
22 import javax.crypto.SecretKey;
23
24
30 public class Secure
31 {
32
33
34 private static Cipher s_cipher = null;
35 private static SecretKey s_key = null;
36
37
38 public static final String CLEARTEXT = "xyz";
39
40
43 private static void initCipher()
44 {
45 try
46 {
47 s_cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
48 if (false)
50 {
51 KeyGenerator keygen = KeyGenerator.getInstance("DES");
52 s_key = keygen.generateKey();
53 byte[] key = s_key.getEncoded();
54 System.out.print("Key " + s_key.getAlgorithm() + "(" + key.length + ")= ");
55 for (int i = 0; i < key.length; i++)
56 System.out.print(key[i] + ",");
57 System.out.println("");
58 }
59 else
60 s_key = new javax.crypto.spec.SecretKeySpec(new byte[] {100,25,28,-122,-26,94,-3,-26}, "DES");
61 }
62 catch (Exception ex)
63 {
64 ex.printStackTrace();
65 }
66 }
68
73 public static String encrypt (String value)
74 {
75 String clearText = value;
76 if (clearText == null)
77 clearText = "";
78 if (s_cipher == null)
80 initCipher();
81 if (s_cipher != null)
83 {
84 try
85 {
86 s_cipher.init(Cipher.ENCRYPT_MODE, s_key);
87 byte[] encBytes = s_cipher.doFinal(clearText.getBytes());
88 String encString = convertToHexString(encBytes);
89 return encString;
91 }
92 catch (Exception ex)
93 {
94 ex.printStackTrace();
95 }
96 }
97 return CLEARTEXT + value;
98 }
100
105 public static String decrypt (String value)
106 {
107 if (value == null)
108 return null;
109 if (value.length() == 0)
110 return value;
111 if (value.startsWith(CLEARTEXT))
112 return value.substring(3);
113 if (s_cipher == null)
115 initCipher();
116
117 if (s_cipher != null && value != null && value.length() > 0)
119 {
120 try
121 {
122 AlgorithmParameters ap = s_cipher.getParameters();
123 s_cipher.init(Cipher.DECRYPT_MODE, s_key, ap);
124 byte[] out = s_cipher.doFinal(convertHexString(value));
125 return new String (out);
127 }
128 catch (Exception ex)
129 {
130 System.err.println ("Secure.decrypt=" + value);
131 ex.printStackTrace();
132 }
133 }
134 return value;
135 }
137
138
139
144 public static int hash (String key)
145 {
146 long tableSize = 2147483647; long hashValue = 0;
148
149 for (int i = 0; i < key.length(); i++)
150 hashValue = (37 * hashValue) + (key.charAt(i) -31);
151
152 hashValue %= tableSize;
153 if (hashValue < 0)
154 hashValue += tableSize;
155
156 int retValue = (int)hashValue;
157 return retValue;
158 }
160
161
162
169 public static String getDigest (String message)
170 {
171 MessageDigest md = null;
172 try
173 {
174 md = MessageDigest.getInstance("MD5");
175 }
177 catch (NoSuchAlgorithmException nsae)
178 {
179 nsae.printStackTrace();
180 }
181 md.reset();
183 byte[] input = message.getBytes();
185 md.update(input);
187 byte[] output = md.digest();
189 md.reset();
190 return convertToHexString(output);
192 }
194
199 public static boolean isDigest (String value)
200 {
201 if (value == null || value.length() != 32)
202 return false;
203 return (convertHexString(value) != null);
205 }
207
208
209
214 static private String convertToHexString (byte[] bytes)
215 {
216 int size = bytes.length;
218 StringBuffer buffer = new StringBuffer (size*2);
219 for(int i=0; i<size; i++)
220 {
221 int x = bytes[i];
223 if (x < 0)
225 x += 256;
226 String tmp = Integer.toHexString(x);
227 if (tmp.length() == 1)
229 buffer.append("0");
230 buffer.append(tmp);
231 }
232 return buffer.toString();
233 }
235
236
241 static private byte[] convertHexString (String hexString)
242 {
243 int size = hexString.length()/2;
244 byte[] retValue = new byte[size];
245 String inString = hexString.toLowerCase();
246
247 try
248 {
249 for (int i = 0; i < size; i++)
250 {
251 int index = i*2;
252 int ii = Integer.parseInt(inString.substring(index, index+2), 16);
253 retValue[i] = (byte)ii;
254 }
255 return retValue;
256 }
257 catch (Exception e)
258 {
259 System.err.println("Secure.convertHexString error - " + e.getMessage());
260 }
261 return null;
262 }
264
265
266
270 public static void main (String [] args)
271 {
272 String [] testString = new String []
273 {"This is a test!", "", "This is a verly long test string 1624$%"};
274 String [] digestResult = new String []
275 {"702edca0b2181c15d457eacac39de39b", "d41d8cd98f00b204e9800998ecf8427e", "934e7c5c6f5508ff50bc425770a10f45"};
276
277 for (int i = 0; i < testString.length; i++)
278 {
279 String digestString = getDigest(testString[i]);
280 if (digestResult[i].equals(digestString))
281 System.out.println("OK - digest");
282 else
283 System.err.println("Digest=" + digestString + " <> " + digestResult[i]);
284 }
285
286 System.out.println("IsDigest true=" + isDigest(digestResult[0]));
287 System.out.println("IsDigest false=" + isDigest("702edca0b2181c15d457eacac39DE39J"));
288 System.out.println("IsDigest false=" + isDigest("702e"));
289
290
292 String in = "4115da655707807F00FF";
295 byte[] bb = convertHexString(in);
296 String out = convertToHexString(bb);
297 if (in.equalsIgnoreCase(out))
298 System.out.println("OK - conversion");
299 else
300 System.err.println("Conversion Error " + in + " <> " + out );
301
302
304 String test = "This is a test!!";
305 String result = "28bd14203bcefba1c5eaef976e44f1746dc2facaa9e0623c";
306 String test_1 = decrypt(result);
308 if (test.equals(test_1))
309 System.out.println("OK - dec_1");
310 else
311 System.out.println("TestDec=" + test_1 + " <> " + test);
312
313
315 String testEnc = encrypt(test);
316 if (result.equals(testEnc))
317 System.out.println("OK - enc");
318 else
319 System.err.println("TestEnc=" + testEnc + " <> " + result);
320
321 String testDec = decrypt(testEnc);
322 if (test.equals(testDec))
323 System.out.println("OK - dec");
324 else
325 System.out.println("TestDec=" + testDec + " <> " + test);
326
327
328 }
330 } |
Popular Tags |
Java API By Example, From Geeks To Geeks.