Digest::base(3pm) User Contributed Perl Documentation Digest::base(3pm)NAME
Digest::base - Digest base class
SYNOPSIS
package Digest::Foo;
use base 'Digest::base';
DESCRIPTION
The "Digest::base" class provide implementations of the methods "addfile" and "add_bits" in terms of "add", and of the methods "hexdigest"
and "b64digest" in terms of "digest".
Digest implementations might want to inherit from this class to get this implementations of the alternative add and 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 Digest.
SEE ALSO
Digest
perl v5.12.4 2009-06-09 Digest::base(3pm)
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Digest::MultiHash(3pm) User Contributed Perl Documentation Digest::MultiHash(3pm)NAME
Digest::MultiHash - XOR based, variable width multiplexing of hashes (a generalized Digest::SV1).
SYNOPSIS
use Digest::MultiHash;
my $d = Digest::Multihash->new(
width => 16, # bytes
hashs => ["SHA-512", "Whirlpool"], # see below for arbitrary arguments
);
$d->add($data);
print $d->hexdigest;
DESCRIPTION
This class inherits from Digest::base, and provides generalized digest multiplexing.
It will multiplex all calls to "add" to all of it's sub digest objects. Likewise, when the final digest is extracted the digests will be
extracted and then XOR'd over eachother according to "width".
"width" will default to the width of the first hash if unspecified.
"hashes" defaults to "SHA-1" for compatibility reasons.
This module is useful for generating keys from passphrases, by supplying the desired width and simply making sure there is enough data from
the combined hashes.
METHODS
See Digest for the complete API. This module inherits from Digest::base.
new This methods accepts a hash reference or an even sized list of parameters named according to the methods.
add
digest
Compute the hash by calling "digest" on all of the subhashes, splitting the result up into "width" sized chunk, and then XORing these
together.
If the result is not aligned on "width" the result will not be truncated. The shorter string will still be XOR'd with the hash, even if
this only affects part of the result.
If there are not at least "width" bytes of data in the output of the combined hashes an error is thrown.
clone
Clones the hash.
hashes
Get the array of hashes to use. Array values in this will be dereferenced before the call to "new" in Digest to allow passing of
arbitrary arguments. Blessed objects (of any class) will be used verbatim.
The list of hashes cannot be changed after construction.
width
Get/set the byte-width to use.
SEE ALSO
Digest, Digest::SV1, Digest::SHA1
perl v5.14.2 2009-10-19 Digest::MultiHash(3pm)