Java MD5 Tool Class

2. Package com.common.tools;
6. Import Java.security.MessageDigest;
10. /**
12. * MD5 Encryption Tool Class
14. * < function Detail Description >
16. *
18. * @author Chenlujun
20. * @version [version number, October 1, 2014]
22. * @see [related classes/methods]
24. * @since [Product/module Version]
26. */
28. Public abstract class Md5tools
30. {
32. public final static string MD5 (string pwd) {
34. //characters used for encryption
36. char md5string[] = { ' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ' , ' 6 ', ' 7 ', ' 8 ', ' 9 ',
38. ' A ', ' B ', ' C ', ' D ', ' E ', ' F '};
40. try {
42. //Use the default character set of the platform to encode this String into a byte sequence and store the result in a new byte array
44. byte[] btinput = Pwd.getbytes ();
48. The //Information digest is a secure, one-way hash function that receives data of any size and outputs a fixed-length hash value.
50. MessageDigest mdinst = messagedigest.getinstance ("MD5");
54. The //messagedigest object processes the data by using the Update method, updating the digest with the specified byte array
56. Mdinst.update (Btinput);
60. after the summary update, hash calculations are performed by calling Digest () to obtain ciphertext
62. byte[] md = Mdinst.digest ();
66. //Convert ciphertext to 16 binary string form
68. int j = md.length;
70. char str[] = new char[j * 2];
72. int k = 0;
74. For (int i = 0; i < J; i++) { //i = 0
76. byte byte0 = md[i]; //95
78. str[k++] = md5string[byte0 >>> 4 & 0xf]; //5
80. str[k++] = md5string[byte0 & 0xf]; //F
82. }
86. //Returns the encrypted string
88. return new String (str);
92. } catch (Exception e) {
94. return null;
96. }
98. }
100. }
102. Transfer from http://blog.csdn.net/clj198606061111/article/details/39722781

Java MD5 Tool Class