NAME

       Crypt::Bcrypt - A modern bcrypt implementation

VERSION

       version 0.007

SYNOPSIS

        use Crypt::Bcrypt qw/bcrypt bcrypt_check/;

        my $hash = bcrypt($password, '2b', 12, $salt);

        if (bcrypt_check($password, $hash)) {
           ...
        }

DESCRIPTION

       This module provides a modern and user-friendly implementation of the bcrypt password
       hash.

       Note that in bcrypt passwords may only contain 72 characters. It may seem tempting to
       prehash the password before bcrypting it but that may make it vulnerable to password
       shucking, a salted solution (for example using a MAC) should be used instead if one wants
       to support large passwords.

       The password is always expected to come as a (utf8-encoded) byte-string.

FUNCTIONS

   bcrypt($password, $subtype, $cost, $salt)
       This computes the bcrypt hash for $password in $subtype, with $cost and $salt.

       Valid subtypes are:

       •   "2b"

           This is the subtype the rest of the world has been using since 2014, you should use
           this unless you have a very specific reason to use something else.

       •   "2a"

           This is an old and subtly buggy version of bcrypt. This is mainly useful for
           Crypt::Eksblowfish compatibility.

       •   "2y"

           This type is considered equivalent to "2b", and is only commonly used on php.

       •   "2x"

           This is a very broken version that is only useful for compatibility with ancient php
           versions.

       $cost must be between 5 and 31 (inclusive). $salt must be exactly 16 bytes.

   bcrypt_check($password, $hash)
       This checks if the $password satisfies the $hash, and does so in a timing-safe manner.

SEE OTHER

       •   Crypt::Passphrase

           This is usually a better approach to managing your passwords, it can use this module
           via Crypt::Passphrase::Bcrypt. It adds support for automatic pre-hashing, and
           facilitates upgrading the algorithm parameters or even the algorithm itself.

       •   Crypt::Eksblowfish::Bcrypt

           This also offers bcrypt, but only supports the "2a" subtype.

AUTHOR

       Leon Timmermans <leont@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2021 by Leon Timmermans.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.