package endecrypt;
02.
03.import java.io.UnsupportedEncodingException;
04.import java.security.MessageDigest ;
05.import java.security.NoSuchAlgorithmException;
06.
07./**
08. * Use MD5 Encryption and decryption
09. * @author tfq
10. * @datetime 2011-10-13
11. */
12. public class MD5Util {
13.
14. /***
15. * MD5 encoding generates 32-bit md5 code
< p>16. */17. public static String string2MD5(String inStr){
18. MessageDigest md5 = null;
19. try{ < /p>
20. md5 = MessageDigest.getInstance("MD5");
21. }catch (Exception e){
22. System.out.println( e.toString());
23. e.printStackTrace();
24. return "";
25. }
< p>26. char[] charArray = inStr.toCharArray();27. byte[] byteArray = new byte[charArray.length];
28.
29. for (int i = 0; i < charArray.length; i++)
30. byteArray[i] = (byte) charArray[i];
31 . byte[] md5Bytes = md5.digest(byteArray);
32. StringBuffer hexValue = new StringBuffer();
33. for (int i = 0; i < md5Bytes. length; i++){
34. int val = ((int) md5Bytes[i]) & 0xff;
35. if (val < 16)
36. hexValue.append("0");
37. hexValue.append(Integer.toHexString(val));
38. }
39. return hexValue.toString();
40.
41. }
42.
43. /** < /p>
44. * The encryption and decryption algorithm performs encryption once and decryption twice
45. */
46. public static String convertMD5(String inStr){
45. p>
47.
48. char[] a = inStr.toCharArray();
49. for (int i = 0; i < a.length; i++ ){
50. a[i] = (char) (a[i] ^ 't');
51. }
52. String s = new String(a);
53. return s;
54.
55. }