ansaurus

Question

Ruby Implementation of RSA Data Security, Inc. MD5 Message-Digest Algorithm

Answer 1

+4 A:

There's plenty of them here

In fact, you're likely to find one using:

require 'digest/md5'

Alnitak 2008-12-14 22:34:10

I checked it out, it doesn't seem to have this particular algorithm.

Sanjay 2008-12-15 00:03:17

It very likely _does_ have the bog-standard MD5 algorithm. What do you mean?

Alnitak 2008-12-15 00:35:07

The algorithm is below (pasted from javascript code) function MD5(entree) ... for (i=0;i<4;i++) ka+=shl(digestBits[15-i], (i*8)); for (i=4;i<8;i++) kb+=shl(digestBits[15-i], ((i-4)*8)); ...s=hexa(kd)+hexa(kc)+hexa(kb)+hexa(ka); return s; digest/md5 does only md5 encoding. This is more complex.

Sanjay 2008-12-15 00:51:14

That extra stuff you've found is just hex-encoding the 128-bit result of the MD5 digest. The real MD5 algorithm is found in the stuff I posted.

Alnitak 2008-12-15 09:30:36

and BTW, that code at openx.org is broken - it's only good for 7-bit ASCII, so if your text contains byte values < 32 || > 127 it'll produce non-conformant digests.

Alnitak 2008-12-15 09:33:38

ansaurus

tags:

views:

answers:

Ruby Implementation of RSA Data Security, Inc. MD5 Message-Digest Algorithm

related questions