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package Digest::base; |
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use strict; |
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use vars qw($VERSION); |
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$VERSION = "1.00"; |
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# subclass is supposed to implement at least these |
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sub new; |
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sub clone; |
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sub add; |
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sub digest; |
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sub reset { |
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my $self = shift; |
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$self->new(@_); # ugly |
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} |
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sub addfile { |
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my ($self, $handle) = @_; |
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my $n; |
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my $buf = ""; |
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while (($n = read($handle, $buf, 4*1024))) { |
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$self->add($buf); |
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} |
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unless (defined $n) { |
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require Carp; |
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Carp::croak("Read failed: $!"); |
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} |
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$self; |
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} |
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sub add_bits { |
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my $self = shift; |
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my $bits; |
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my $nbits; |
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if (@_ == 1) { |
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my $arg = shift; |
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$bits = pack("B*", $arg); |
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$nbits = length($arg); |
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} |
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else { |
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($bits, $nbits) = @_; |
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} |
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if (($nbits % 8) != 0) { |
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require Carp; |
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Carp::croak("Number of bits must be multiple of 8 for this algorithm"); |
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} |
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return $self->add(substr($bits, 0, $nbits/8)); |
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} |
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sub hexdigest { |
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my $self = shift; |
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return unpack("H*", $self->digest(@_)); |
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} |
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sub b64digest { |
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my $self = shift; |
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require MIME::Base64; |
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my $b64 = MIME::Base64::encode($self->digest(@_), ""); |
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$b64 =~ s/=+$//; |
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return $b64; |
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} |
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1; |
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__END__ |
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=head1 NAME |
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Digest::base - Digest base class |
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=head1 SYNOPSIS |
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package Digest::Foo; |
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use base 'Digest::base'; |
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=head1 DESCRIPTION |
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The C<Digest::base> class provide implementations of the methods |
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C<addfile> and C<add_bits> in terms of C<add>, and of the methods |
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C<hexdigest> and C<b64digest> in terms of C<digest>. |
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Digest implementations might want to inherit from this class to get |
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this implementations of the alternative I<add> and I<digest> methods. |
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A minimal subclass needs to implement the following methods by itself: |
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new |
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clone |
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add |
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digest |
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The arguments and expected behaviour of these methods are described in |
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L<Digest>. |
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=head1 SEE ALSO |
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L<Digest> |
