Implementing Digest-MD5 in J2ME: How to compute the 16 octet MD5 hash of a String?

Question

I am implementing digest-md5 in J2ME.In the computation of the client response, the following steps are given:

1. Create a string of the form "username:realm:password". Call this string X.
2. Compute the 16 octet MD5 hash of X. Call the result Y.
3. Create a string of the form "Y:nonce:cnonce:authzid". Call this string A1.
4. Create a string of the form "AUTHENTICATE:digest-uri". Call this string A2.
5. Compute the 32 hex digit MD5 hash of A1. Call the result HA1.
6. Compute the 32 hex digit MD5 hash of A2. Call the result HA2.
7. Create a string of the form "HA1:nonce:nc:cnonce:qop:HA2". Call this string KD.
8. Compute the 32 hex digit MD5 hash of KD. Call the result Z.

Does anyone here know how to implement step 2? I have a md5 function that returns a 32 hex digit but i don't know how to compute a 16 octet md5 hash?

I just would like to reiterate that I am using J2ME. In that case I can not simply use MessageDigest.

Thank you in advance. :)

Answer 1

see this

use MD-5 instead SHA 256