NAME

App::bmkpasswd - bcrypt-capable mkpasswd(1) and exported helpers

SYNOPSIS

bmkpasswd --help

## Generate bcrypted passwords
## Defaults to work cost factor '08':
bmkpasswd
bmkpasswd --workcost='06'

## Use other methods:
bmkpasswd --method='md5'
# SHA requires Crypt::Passwd::XS or glibc2.7+
bmkpasswd --method='sha512'

## Compare a hash:
bmkpasswd --check=HASH

DESCRIPTION

App::bmkpasswd is a simple bcrypt-enabled mkpasswd. (Helper functions are also exported for use in other applications; see "EXPORTED".)

See bmkpasswd --help for usage information.

Uses Crypt::Eksblowfish::Bcrypt for bcrypted passwords. (See http://codahale.com/how-to-safely-store-a-password/ for why you ought to be using bcrypt or similar "adaptive" techniques).

SHA-256 and SHA-512 are supported if available. You'll need either Crypt::Passwd::XS or a system crypt() that can handle SHA, such as glibc-2.7+ or newer FreeBSD builds.

MD5 uses the system's crypt() -- support for it is fairly universal, but it is known insecure and there is really no valid excuse to be using it ;-)

Salts are randomly generated.

EXPORTED

You can use the exported mkpasswd and passwdcmp functions in other Perl modules/applications:

use App::bmkpasswd qw/mkpasswd passwdcmp/;
## Generate a bcrypted passwd with work-cost 08:
$bcrypted = mkpasswd($passwd);
## Generate a bcrypted passwd with other work-cost:
$bcrypted = mkpasswd($passwd, 'bcrypt', '06');
## SHA:
$crypted = mkpasswd($passwd, 'sha256');
$crypted = mkpasswd($passwd, 'sha512');

## Compare a password against a hash
## passwdcmp() will return the hash if it is a match
$pwd_matched++ if passwdcmp($passwd, $hash);

BUGS

There is currently no easy way to pass your own salt; frankly, this thing is aimed at some projects of mine where that issue is unlikely to come up and randomized is appropriate. If that's a problem, patches welcome? ;-)

AUTHOR

Jon Portnoy <avenj@cobaltirc.org>