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package Crypt::PBKDF2::Hash::DigestHMAC;
# ABSTRACT: Digest::HMAC hash support for Crypt::PBKDF2.
our $VERSION = '0.142390'; # VERSION
our $AUTHORITY = 'cpan:ARODLAND'; # AUTHORITY
use Moose 1;
use namespace::autoclean;
use Digest 1.16 ();
use Digest::HMAC 1.01 ();
use Try::Tiny 0.04;
use Carp qw(croak);
with 'Crypt::PBKDF2::Hash';
has digest_class => (
is => 'ro',
required => 1,
);
has _digest => (
is => 'ro',
lazy_build => 1,
init_arg => undef,
);
sub _build__digest {
my $self = shift;
return Digest->new($self->digest_class);
}
sub BUILD {
my $self = shift;
try {
my $digest = $self->_digest;
} catch {
croak "Couldn't construct a Digest of type " . $self->digest_class . ": $_";
}
}
sub hash_len {
my $self = shift;
return length( $self->_digest->clone->add("")->digest );
}
sub generate {
my ($self, $data, $key) = @_;
my $digest = $self->_digest->clone;
return Digest::HMAC::hmac($data, $key,
sub { $digest->add(@_)->digest });
}
sub to_algo_string {
my $self = shift;
return $self->digest_class;
}
sub from_algo_string {
my ($class, $str) = shift;
return $class->new(digest_class => $str);
}
__PACKAGE__->meta->make_immutable;
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
Crypt::PBKDF2::Hash::DigestHMAC - Digest::HMAC hash support for Crypt::PBKDF2.
=head1 VERSION
version 0.142390
=head1 DESCRIPTION
Uses L<Digest::HMAC> to make nearly any L<Digest>-compatible module
compatible with L<Crypt::PKBDF2> by driving it with the standard HMAC
algorithm to combine the key and the data.
=head1 ATTRIBUTES
=head2 digest_class
The Digest class to use. Will be passed to C<< Digest->new >>.
=head1 AUTHOR
Andrew Rodland <arodland@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2014 by Andrew Rodland.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
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