May I suggest also sha256 sha512 and ripemd160? I assume the underlying code is from openssl. The reason I did not include md5 there is that it has been baptised insecure/compromised by the wiki lords http://en.wikipedia.org/wiki/Cryptographic_hash_function. The paper describing the collision attack on md5: http://eprint.iacr.org/2009/223.pdf. Its not a craft any replacement attack/weakness by any means, but its enough to discourage its use in the same sense that "no one ever got fired for buying IBM".
________________________________ From: chris burke <[email protected]> To: Programming forum <[email protected]> Sent: Tuesday, July 15, 2014 11:11:01 AM Subject: Re: [Jprogramming] md5 getmd5 will be in the next release of JQt (getsha1 is already there). AFAIK, convert/misc/md5 only works on 32-bit. On Mon, Jul 14, 2014 at 7:10 PM, Raul Miller <[email protected]> wrote: > I've been using the convert/misc/md5 addon, but it is rather slow. > > Using it on a 140k string on a moderately sized box was taking between 6 > and 7 seconds. And I've got a lot of strings for it to grind through (many > gigabytes). > > So I decided I wanted to use compiled code. And, since we don't have a J > compiler (yet), I decided to use C: > > The first thing I did was look at the source for the md5 on an ubuntu > system. That's in coreutils, and it was something of a mess. > > After backing off from trying to extract the useful parts of that as a > shared library, I found that RFC 1321 contains a reference implementation > (which looks like it was the basis for the mess I was trying to work > with*). That was clean enough that I could rather easily extract it, build > it, and get it to work. > > The result is at https://github.com/rdm/libmd5.so > > The J test suite (https://github.com/rdm/libmd5.so/blob/master/md5test.ijs > ) > was also extracted from RFC 1321, except for a couple lines which define > the interface to the compiled code). > > Note that I'm using this with j602 (the 32 bit version), because that's the > only version where the sax xml parsing works. And, I've only tested it on > ubuntu 14.04 lts. But if someone else needs a fast md5 implementation, > perhaps it won't be too much work to get this working on whatever system > you work with. > > FYI, > > -- > Raul > > * P.S. I say "mess" because it has been loaded down with so many layers of > config toolchain and abstraction that it's really hard to find where > anything happens. That's fine for some contexts, but useless for others. > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
