From: James Keener <jimktrains@...>
Date: 2010-10-28T06:50:22+09:00
Subject: Blowfish hash

With the PHP Crypt function
[http://php.net/manual/en/function.crypt.php] I can use blowfish to
create a hash.  Is there an equivalent function for ruby?  Preferably
native code, as the cost parameter we use is high (more than my example
below) and takes about 3 seconds in native code to run.

Before you reply:
1) Block ciphers can be used as one-way hash functions and vice-verse
2) The salt does not need to be formatted the same, just the output of
hashing itself (excluding the salt)

So, for example:
php> echo crypt('this is a test', '$2a$12$abcdefghijklmnopqrstuv');
$2a$12$abcdefghijklmnopqrstuulXXDmWA0ghEUfxodWoZCvd8NILoFYg2

Where:
'12' is the 'base-2 logarithm of the iteration count for the underlying
Blowfish-based hashing algorithmeter'
'abcdefghijklmnopqrstuv' is the IV (I think?) in base64 (I'm not 100%
sure why it only uses to u but fails w/o the v)
'ulXXDmWA0ghEUfxodWoZCvd8NILoFYg2' is the output of the hashing
algorithm


php> echo crypt('\/\/007 my example rocks because it\'s amazing!!!!!!',
'$2a$12$wellwhatdoyaknowimhere');
$2a$12$wellwhatdoyaknowimheremd2ausy8yN9LSOrhdYQXUwYi1oQIEzi

Where:
'12' is the 'base-2 logarithm of the iteration count for the underlying
Blowfish-based hashing algorithmeter'
'wellwhatdoyaknowimhere' is the IV (I think?) in base64
'md2ausy8yN9LSOrhdYQXUwYi1oQIEzi' is the output of the hashing algorithm

Thanks,
Jim

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