|Does that mean you can deduce the cost from the output hash alone? In order to adjust the cost over time, one either need to store the cost or be able to compute it (e.g. from the output hash).
I believe so. It's stored right after the $2a$. The output hash, by the looks of it, is similar to the way passwords are stored in Unixes -- and this is no surprise since bcrypt came from the OpenBSD guys.
The format is: $cryptomethod$length$salt$password, although anything after $cryptomethod$ is roughly freeform and parsed by the method (i.e. bcrypt) itself.
I'm not sure about what sort of hash Digest::Bcrypt is supposed to return, but it looks nothing like the raw Eksblowfish version. Personally, I would not trust this module if I cannot get an output similar to the crypt(3) C function from it.
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