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package Digest::base;
use strict;
use warnings;
our $VERSION = "1.19";
# subclass is supposed to implement at least these
sub new;
sub clone;
sub add;
sub digest;
sub reset {
my $self = shift;
$self->new(@_); # ugly
}
sub addfile {
my ( $self, $handle ) = @_;
my $n;
my $buf = "";
while ( ( $n = read( $handle, $buf, 4 * 1024 ) ) ) {
$self->add($buf);
}
unless ( defined $n ) {
require Carp;
Carp::croak("Read failed: $!");
}
$self;
}
sub add_bits {
my $self = shift;
my $bits;
my $nbits;
if ( @_ == 1 ) {
my $arg = shift;
$bits = pack( "B*", $arg );
$nbits = length($arg);
}
else {
( $bits, $nbits ) = @_;
}
if ( ( $nbits % 8 ) != 0 ) {
require Carp;
Carp::croak("Number of bits must be multiple of 8 for this algorithm");
}
return $self->add( substr( $bits, 0, $nbits / 8 ) );
}
sub hexdigest {
my $self = shift;
return unpack( "H*", $self->digest(@_) );
}
sub b64digest {
my $self = shift;
my $b64 = $self->base64_padded_digest;
$b64 =~ s/=+$//;
return $b64;
}
sub base64_padded_digest {
my $self = shift;
require MIME::Base64;
return MIME::Base64::encode( $self->digest(@_), "" );
}
1;
__END__
=head1 NAME
Digest::base - Digest base class
=head1 SYNOPSIS
package Digest::Foo;
use base 'Digest::base';
=head1 DESCRIPTION
The C<Digest::base> class provide implementations of the methods
C<addfile> and C<add_bits> in terms of C<add>, and of the methods
C<hexdigest> and C<b64digest> in terms of C<digest>.
Digest implementations might want to inherit from this class to get
this implementations of the alternative I<add> and I<digest> methods.
A minimal subclass needs to implement the following methods by itself:
new
clone
add
digest
The arguments and expected behaviour of these methods are described in
L<Digest>.
=head1 SEE ALSO
L<Digest>
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