/ 
Crypt-Passphrase-0.001
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/ Crypt::Passphrase

NAME

Crypt::Passphrase - A module for managing passwords in a cryptographically agile manner

VERSION

version 0.001

SYNOPSIS

my $authenticator = Crypt::Passphrase->new(
    encoder    => 'Argon2',
    validators => [ 'Bcrypt' ],
);

my $hash = get_hash($user);
if (!$authenticator->verify_password($password, $hash)) {
    die "Invalid password";
}
elsif ($authenticator->needs_rehash($hash)) {
    update_hash($user, $authenticator->hash_password($password));
}

DESCRIPTION

This module manages the passwords in a cryptographically agile manner. Following Postel's principle, it allows you to define a single scheme that will be used for new passwords, but several schemes to check passwords with. It will be able to tell you if you should rehash your password, not only because the scheme is outdated, but also because the desired parameters have changed.

METHODS

new(...)

  • encoder

    A Crypt::Passphrase object has a single encoder. This can be passed in three different ways:

    • A simple string

      The name of the encoder class. If the value starts with a +, the + will be removed and the remainder will be taken as a fully-qualified package name. Otherwise, Crypt::Passphrase:: will be prepended to he value.

      The class will be loaded, and constructed without arguments.

    • A hash

      The module entry will be used to load a new Crypt::Passphrase module as described above, the other arguments will be passed to the constructor. This is the recommended option, as it gives you full control over the password parameters.

    • A Crypt::Passphrase::Encoder object

      This will be used as-is.

    This argument is mandatory.

  • validators

    This is a list of additional validators for passwords. These values can each either be the same an encoder value, except that the last entry may also be a coderef that takes the password and the hash as its arguments and returns a boolean value.

    The encoder is always considered as a validator and thus doesn't need to be explicitly specified.

hash_password($password)

This will hash a password with the encoder cipher, and return it (in crypt format). This will generally use a salt, and as such will return a different value each time even when called with the same password.

verify_password($password, $hash)

This will check a password satisfies a certain hash.

needs_rehash($hash)

This will check if a hash needs to be rehashed, either because it's in the wrong cipher or because the parameters are insufficient.

Calling this only ever makes sense after a password has been verified.

SEE ALSO

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.