jc blog - tales of a modern-day nomadic hunter-gatherer

Follow jcomeau_ictx on Twitter This is the weblog of Intrepid Wanderer. You never know what you might find here; graphic descriptions of bodily functions, computer programming secrets, proselytizing for the antichrist, miscellaneous ranting and kvetching, valuable information on living off the land... if you don't share my rather weird interests you may want to try slashdot instead.

You can consider my Del.icio.us links an extension to my blog, as are my LifeTango goals and my other to-do items. My to-buy list is also public, but only for sharing any useful ideas that might be there; I'm not requesting charity, neither do I offer it.

You can find me easily in google searches, as jcomeau, jcomeau_ictx, or jcomeauictx. There are lots of other jcomeaus, but AFAIK I'm the only jcomeau_ictx out there so far.

If you want to comment on anything you see here, try the new Facebook comments, reachable by clicking the "[comment]" link at the end of each post. If for some reason that isn't working, go ahead and email me, jc.unternet.net. You know what to do with the first dot. Make the 'subject' line something reasonably intelligent-looking or it goes plunk! into the spambasket unread.

This RSS feed may or may not work. Haven't fiddled with it in forever. RSS Feed

2021-03-08-1248Z

Every time I get a new (to me at least) computer, I have to solve a number of problems, one of the more urgent of which, once I have Linux or a reasonable facsimile working, is the constant, annoying beeping of Bash autocompletion and vim. Here's how I disabled them this time:

jcomeau@colinux-squeeze:~$ tail ~/.inputrc ~/.vimrc
==> /home/jcomeau/.inputrc <==
set bell-style none

==> /home/jcomeau/.vimrc <== set modeline set noerrorbells visualbell t_vb=

[comment]

2021-03-06-2203Z

I'm an idiot. If the N parameter is less than 0x100000000, then it's perfectly fine to use the low 32 bits. My problem, and the problem with the spec, is that it's the low 32 bits of the final 64 bytes (octets) of the vector. Colin Percival himself answered my first two erratum reports. So far I've seen nothing on the third. [comment]

2021-03-05-1426Z

Submitted an erratum to RFC7914 for the definition of Integerify. I suspect that whoever coded the reference implementation of scrypt didn't want to deal with the hassle of using bignums and just grabbed 4 bytes out of the middle of the octet string as placeholder code, then forgot to go back and fix it before turning it loose on the world.

It will be interesting to see what happens. Ideally, the standard should express, correctly, what the code should do, and not be an apologist for what extant code actually does. But if my suspicion above is correct, then both the RFC and all extant code needs to be corrected.

There would have to be a new version, say scrypt2, because the original code's results are embedded everywhere. Just for one huge example, the litecoin blockchain. [comment]

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