PasswordEncryptor


1   package dinamica.security;
2   
3   import java.util.HashMap  ;
4   import javax.servlet.http.HttpServletRequest  ;
5   import sun.misc.BASE64Encoder;
6   import dinamica.*;
7   
8   /**
9    * This is not a validator. it is used more like
10   * a value transformer. It will transform the parameter
11   * with name "passwd" into a MD5 hash using the following
12   * combination: userlogin:passwd<br>
13   * This validator must be used after all the other validators,
14   * because it does assume that the password and userogin parameters
15   * have been already validated.
16   * <br><br>
17   * Creation date: 10/03/2004<br>
18   * Last Update: 10/03/2004<br>
19   * (c) 2004 Martin Cordova<br>
20   * This code is released under the LGPL license<br>
21   * @author Martin Cordova (dinamica@martincordova.com)
22   * */
23  public class PasswordEncryptor extends AbstractValidator
24  {
25  
26      /* (non-Javadoc)
27       * @see dinamica.AbstractValidator#isValid(javax.servlet.http.HttpServletRequest, dinamica.Recordset, java.util.HashMap)
28       */
29      public boolean isValid(
30          HttpServletRequest   req,
31          Recordset inputParams,
32          HashMap   attribs)
33          throws Throwable  
34      {
35  
36          //retrieve values
37          String   userid = inputParams.getString("userlogin");
38          String   password = inputParams.getString("passwd");
39  
40          //create MD5 hash using the string: userlogin:passwd
41          java.security.MessageDigest   md = java.security.MessageDigest.getInstance("MD5");
42          byte[] b = (userid + ":" + password).getBytes();
43          byte[] hash = md.digest(b);
44          String   pwd = new BASE64Encoder().encode( hash );
45  
46          //set the "passwd" parameter value to the MD5 hash 
47          inputParams.setValue("passwd", pwd);
48  
49          //always return true
50          return true;
51          
52      }
53  
54  }
55
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