File Coverage

blib/lib/Digest.pm

Criterion	Covered	Total	%
statement	33	33	100.0
branch	8	8	100.0
condition	4	6	66.6
subroutine	5	5	100.0
pod	1	1	100.0
total	51	53	96.2

package Digest;

use strict;
use warnings;

our $VERSION = "1.18";

our %MMAP = (
    "SHA-1"    => [ [ "Digest::SHA",  1 ], "Digest::SHA1", [ "Digest::SHA2", 1 ] ],
    "SHA-224"  => [ [ "Digest::SHA",  224 ] ],
    "SHA-256"  => [ [ "Digest::SHA",  256 ], [ "Digest::SHA2", 256 ] ],
    "SHA-384"  => [ [ "Digest::SHA",  384 ], [ "Digest::SHA2", 384 ] ],
    "SHA-512"  => [ [ "Digest::SHA",  512 ], [ "Digest::SHA2", 512 ] ],
    "SHA3-224" => [ [ "Digest::SHA3", 224 ] ],
    "SHA3-256" => [ [ "Digest::SHA3", 256 ] ],
    "SHA3-384" => [ [ "Digest::SHA3", 384 ] ],
    "SHA3-512" => [ [ "Digest::SHA3", 512 ] ],
    "HMAC-MD5"   => "Digest::HMAC_MD5",
    "HMAC-SHA-1" => "Digest::HMAC_SHA1",
    "CRC-16"     => [ [ "Digest::CRC", type => "crc16" ] ],
    "CRC-32"     => [ [ "Digest::CRC", type => "crc32" ] ],
    "CRC-CCITT"  => [ [ "Digest::CRC", type => "crcccitt" ] ],
    "RIPEMD-160" => "Crypt::RIPEMD160",
);

sub new {
    shift;    # class ignored
    my $algorithm = shift;
    my $impl      = $MMAP{$algorithm} || do {
        $algorithm =~ s/\W+//g;
        "Digest::$algorithm";
    };
    $impl = [$impl] unless ref($impl);
    local $@;    # don't clobber it for our caller
    my $err;
    for (@$impl) {
        my $class = $_;
        my @args;
        ( $class, @args ) = @$class if ref($class);
        no strict 'refs';
        unless ( exists ${"$class\::"}{"VERSION"} ) {
            my $pm_file = $class . ".pm";
            $pm_file =~ s{::}{/}g;
            eval { require $pm_file };
            if ($@) {
                $err ||= $@;
                next;
            }
        }
        return $class->new( @args, @_ );
    }
    die $err;
}

our $AUTOLOAD;

sub AUTOLOAD {
    my $class     = shift;
    my $algorithm = substr( $AUTOLOAD, rindex( $AUTOLOAD, '::' ) + 2 );
    $class->new( $algorithm, @_ );
}

1;

__END__