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From "Christian Hammers (Commented) (JIRA)" <>
Subject [jira] [Commented] (CODEC-133) Please add a function for the MD5/SHA1/SHA-512 based Unix crypt(3) hash variants
Date Sat, 25 Feb 2012 12:25:48 GMT


Christian Hammers commented on CODEC-133:

No problem, I will upload smaller patches once the general legal issues are solved.
> Please add a function for the MD5/SHA1/SHA-512 based Unix crypt(3) hash variants
> --------------------------------------------------------------------------------
>                 Key: CODEC-133
>                 URL:
>             Project: Commons Codec
>          Issue Type: New Feature
>    Affects Versions: 1.6
>            Reporter: Christian Hammers
>              Labels: MD5, SHA-512, crypt(3), crypto, hash
>         Attachments: crypt3-with-utexas-licence.diff
> The Linux libc6 crypt(3) function, which is used to generate e.g. the password hashes
in /etc/shadow, is available in nearly all other programming languages (Perl, PHP, Python,
C, C++, ...) and databases like MySQL and offers MD5/SHA1/SHA-512 based algorithms that were
improved by adding a salt and several iterations to make rainbow table attacks harder. Thus
they are widely used to store user passwords.
> Java, though, has due it's platform independence, no direct access to the libc functions
and still lacks an proper port of the crypt(3) function.
> I already filed a wishlist bug (CODEC-104) for the traditional 56-bit DES based crypt(3)
method but would also like to see the much stronger algorithms.
> There are other bug reports like DIRSTUDIO-738 that demand those crypt variants for some
specific applications so there it would benefit other Apache projects as well.
> Java ports of most of the specific crypt variants are already existing, but they would
have to be cleaned up, properly tested and license checked:
> I would be willing to help here by cleaning the source code and writing unit tests etc.
but I'd like to generally know if you are interested and if there's someone who can do a code
review (it's security relevant after all and I'm no crypto guy)
> bye,
> -christian-

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