Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
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.

In reply to Re^3: Adjust bcrypt cost to prevent future password hash attacks by Anonymous Monk
in thread Adjust bcrypt cost to prevent future password hash attacks by andreas1234567

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (4)
    As of 2019-01-22 21:10 GMT
    Find Nodes?
      Voting Booth?
      After Perl5, I'm mostly interested in:

      Results (392 votes). Check out past polls.