how to implement php's crypt_md5 in java

Question

I have a simple application in PHP which uses the following code to hash the password and store it in a db.

<?php
$user_name = "admin";
$password = "1234";
$salt = substr($user_name, 0, 2);
$salt = '$1$' . $salt . '$'; //$salt = $1$ad$
$crypt_password = crypt($password, $salt);
echo $crypt_password;
?>

this code, produces the following password to store in the db: $1$ad$BH3wnQs1wym28vdzP8zyh1

I am trying to make exactly the same code with Java, but as I am new to Java, I have a lot of difficulties. I checked over here http://www.java2s.com/Open-Source/Java-Document/Groupware/LibreSource/md5/MD5Crypt.java.htm#cryptStringString and it seems that it is what I need, but I didn't manage to make it work. Any help would be appreciated. Thank you in advance.

if you dont need to use md5 for what ever app your building, try sha1 its much more secure then md5 and im sure java would support that — Lawrence Cherone, May 21 '11 at 22:25
Does this help? http://stackoverflow.com/questions/415953/generate-md5-hash-in-java — jbrookover, May 21 '11 at 22:27
I thought that by using the following code String password = MD5Crypt.crypt("1234","a"); System.out.println(password); I would have what I needed, but it doesn't work, I guess because I am not importing the right package? — thr33pwood, May 21 '11 at 23:32
Finally I got that working with the following code: String password = MD5Crypt.crypt("1234","a"); System.out.println(password); I just had to create also the MD5Crypt.class . Thanx for the answers all — thr33pwood, May 22 '11 at 00:49

Imanol Luengo · Answer 1 · 2011-05-21T22:56:32.683

0

If md5 works for you, you can try the following code:

    String pass = "1234";
    MessageDigest crypt = null;

    try {
        crypt = java.security.MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        System.out.println("MD5 not supported");
        return; // depends on your method
    }

    byte[] digested = crypt.digest(pass.getBytes());
    String crypt_password = new String();

    // Converts bytes to string
    for (byte b : digested) 
        crypt_password += Integer.toHexString(0xFF & b);

    System.out.println(crypt_password);

Also, you can change "MD5" to "SHA1" and should work too.

edited May 21 '11 at 22:56

answered May 21 '11 at 22:49

Imanol Luengo

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this seems to be working, but it is actually what md5("1234") does in PHP. I am looking for a way to 'represent' what crypt($password, $salt) does in PHP, although I could just use this code and change the way i store the password in the db. – thr33pwood May 21 '11 at 23:29

how to implement php's crypt_md5 in java

1 Answers1