Manual Reference Pages - OBJECT::SIGNATURE (3)
Object::Signature - Generate cryptographic signatures for objects
# In your module
use base Object::Signature;
# In outside code
my $Object = My::Module->new;
print "Object Signature: " . $Object->signature;
Object::Signature is an abstract base class that you can inherit from in
order to allow your objects to generate unique cryptographic signatures.
The method used to generate the signature is based on Storable and
Digest::MD5. The object is fed to Storable::nfreeze to get a string,
which is then passed to Digest::MD5::md5_hex to get a unique 32
character hexidecimal signature.
The signature method is the only method added to your class, and will
generate a unique 32 hexidecimal signature for any object it is called on.
All bugs should be filed via the bug tracker at
For other issues, or commercial enhancement or support, contact the author.
Currently has to generate the entire Storable string before digesting
it. Would be nice if there was a way to incrementally Storablise and Digest
in one pass so that it becomes much more memory efficient for large objects.
Strengthen the Digest Algorithm
Once the current (as of 2005) hashing controversy settles down, consider
selecting a newer and more powerful hashing algorithm to replace MD5. Or
offer alternatives depending on how important the security situation is,
as MD5 is <B>veryB> fast (90 meg a second) and many more-secure ones are a
lot slower (more than 10 times slower in some cases).
On our side is the fact we use Storable. It should be <B>muchB> harder to create
collisions when you dont control the string, only the structure <B>beforeB>
it goes through Storable.
Adam Kennedy <email@example.com>
Copyright 2004 - 2011 Adam Kennedy.
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the
LICENSE file included with this module.
|perl v5.20.3 ||OBJECT::SIGNATURE (3) ||2011-03-24 |
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