Comments on: More SHA in Erlang

By: Matt Williamson

Matt Williamson — Thu, 22 Jan 2009 12:37:32 +0000

Thanks man, I was about to write a C driver because I was getting desperate.

By: steve

steve — Thu, 08 Jan 2009 14:51:45 +0000

@Nicolas: no, I don’t think performance would be all that great for a 50MB file. One of the test vectors is 393216 bytes, for example, and it takes 4.33s to run through SHA-256. Given that the performance appears to be fairly linear with respect to the input message size, I think it would take over 10 minutes to deal with a 50MB file.

Still, the performance is better than nothing, which is the support the crypto module currently gives us for these functions.

By: Nicolas

Nicolas — Thu, 08 Jan 2009 11:18:02 +0000

I wrote a SHA-1 library for Erlang in 2007, just to play with pattern matching:

http://journal.batard.info/post/2007/07/19/erlang-sha-1-library

I am aware of crypto:sha/1, this was not meant to be used, but rather just a demo.

I’m writing as the performance of my module was astoundingly bad; is yours better? Have you tried hashing even just a 50MB file?

Looking forward to hearing from you,

Nicolas.

By: Steve

Steve — Wed, 07 Jan 2009 11:08:42 +0000

Thanks for keeping Erlang “on the curve” :)

By: MononcQc

MononcQc — Mon, 05 Jan 2009 13:42:37 +0000

Thanks a lot! I was definitely looking for a better sha module for erlang just this week and it seems this comes in right in time.

This will prove itself to be really useful, and if good enough, I hope it can eventually make it into the standard erlang library.