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package App::Raps2::Password;
use strict;
use warnings;
use 5.010;
use Carp 'confess';
use Crypt::CBC;
use Crypt::Eksblowfish;
use Crypt::Eksblowfish::Bcrypt qw(bcrypt_hash en_base64 de_base64);
our $VERSION = '0.2';
=head1 NAME
App::Raps2::Password - Password class for App::Raps2
=head1 SYNOPSIS
use App::Raps2::Password;
my $pass = App::Raps2::Password->new(
passphrase => 'secret',
);
my $oneway_hash = $raps2->crypt();
$raps2->verify($oneway_hash);
my $twoway_hash = $raps2->encrypt('data');
print $raps2->decrypt($twoway_hash);
# "data"
=head1 VERSION
This manual documents B<App::Raps2::Password> version 0.2
=head1 METHODS
=over
=item $pass = App::Raps2::Password->new(I<%conf>)
Creates a new I<App::Raps2::Password> object. You can only have one passphrase
per object. Arguments:
=over
=item B<cost> => I<int>
Cost to pass to B<Crypt::Eksblowfish>, defaults to 12.
=item B<passphrase> => I<string>
Passphrase to operate with. Mandatory.
=item B<salt> => I<string>
16-byte string to use as salt. If none is specified, B<App::Raps2::Password>
generates its own.
=back
=cut
sub new {
my ($obj, %conf) = @_;
$conf{cost} //= 12;
if (not defined $conf{salt}) {
$conf{salt} = create_salt();
}
if (length($conf{salt}) != 16) {
confess('incorrect salt length');
}
if (not (defined $conf{passphrase} and length $conf{passphrase})) {
confess('no passphrase given');
}
my $ref = \%conf;
return bless($ref, $obj);
}
=item $pass->create_salt()
Returns a new 16-byte salt. Contains only printable characters.
=cut
sub create_salt {
my ($self) = @_;
my $salt = q{};
for (1 .. 16) {
$salt .= chr(0x21 + int(rand(90)));
}
return $salt;
}
=item $pass->salt([I<salt>])
Returns the currently used salt and optionally changes it to I<salt>.
=cut
sub salt {
my ($self, $salt) = @_;
if (defined $salt) {
if (length($salt) != 16) {
confess('incorrect salt length');
}
$self->{salt} = $salt;
}
return $self->{salt};
}
=item $pass->encrypt(I<data>)
Encrypts I<data> with the passphrase saved in the object, returns the
corresponding hexadecimal hash (as string).
=cut
sub encrypt {
my ($self, $in) = @_;
my $eksblowfish = Crypt::Eksblowfish->new(
$self->{cost},
$self->{salt},
$self->{passphrase},
);
my $cbc = Crypt::CBC->new(-cipher => $eksblowfish);
return $cbc->encrypt_hex($in);
}
=item $pass->decrypt(I<hexstr>)
Decrypts I<hexstr> (as created by B<encrypt>), returns its original content.
=cut
sub decrypt {
my ($self, $in) = @_;
my $eksblowfish = Crypt::Eksblowfish->new(
$self->{cost},
$self->{salt},
$self->{passphrase},
);
my $cbc = Crypt::CBC->new(-cipher => $eksblowfish);
return $cbc->decrypt_hex($in);
}
=item $pass->crypt()
Return a base64 bcrypt hash of the password, salted with the salt.
=cut
sub crypt {
my ($self) = @_;
return en_base64(
bcrypt_hash({
key_nul => 1,
cost => $self->{cost},
salt => $self->{salt},
},
$self->{passphrase},
));
}
=item $pass->verify(I<hash>)
Verify a hash as returned by B<crypt>.
Returns true if it matches, dies if it doesn't.
=cut
sub verify {
my ($self, $testhash) = @_;
my $myhash = $self->crypt();
if ($testhash eq $myhash) {
return 1;
}
confess('Passwords did not match');
}
1;
__END__
=back
=head1 DEPENDENCIES
B<Crypt::CBC>, B<Crypt::Eksblowfish>.
=head1 SEE ALSO
Crypt::CBC(3pm), Crypt::Eksblowfish(3pm).
=head1 AUTHOR
Copyright (C) 2011 by Daniel Friesel E<lt>derf@finalrewind.orgE<gt>
=head1 LICENSE
0. You just DO WHAT THE FUCK YOU WANT TO.
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