Encrypt and decrypt a password in Java

Question

I want to encrypt and decrypt a password  in Java and store into database in the form of encrypted  It will great if it is open source  Any suggestions   pointers

User · Answer

I recently used Spring Security 3 0 for this  combined with Wicket btw   and am quite happy with it  Here s a good thorough tutorial and documentation  Also take a look at this tutorial which gives a good explanation of the hashing salting decoding setup for Spring Security 2

User · Answer

EDIT   this answer is old  Usage of MD5 is now discouraged as it can easily be broken     MD5 must be good enough for you I imagine  You can achieve it with MessageDigest   MessageDigest getInstance  MD5     There are also other algorithms listed here   And here s an third party version of it  if you really want  Fast MD5

User · Answer

You can use java security MessageDigest with SHA as your algorithm choice   For reference    Try available example here

User · Answer

Here is the algorithm I use to crypt with MD5 It returns your crypted output      public class CryptWithMD5      private static MessageDigest md      public static String cryptWithMD5 String pass       try           md   MessageDigest getInstance  MD5            byte   passBytes   pass getBytes            md reset            byte   digested   md digest passBytes           StringBuffer sb   new StringBuffer            for int i 0 i lt digested length i                 sb append Integer toHexString 0xff  amp  digested i                       return sb toString          catch  NoSuchAlgorithmException ex            Logger getLogger CryptWithMD5 class getName    log Level SEVERE  null  ex                 return null             You cannot decrypt MD5  but you can compare outputs since if you put the same string in this method it will have the same crypted output If you want to decrypt you need to use the SHA You will never use decription for a users password For that always use MD5 That exception is pretty redundant It will never throw it

User · Answer

Jasypt  can do it for you easy and simple

[java] Encrypt and decrypt a password in Java

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