|o||Source filters are slow. VERY Slow. Filter::CBC is not an exception. Well uhm kinda. Filter::CBC is even slower. Be warned, be VERY VERY warned.|
|o||Youre source file is overwrittten when youre using the autoefilter feature.|
The two parameters that can be passed along are :
CBC Handler This parameter indicates what CBC encryption routine to use. Possible values are described in the next section. Keyphrase This parameter is the keyphrase for the encryption routine described as previous parameter.
The following parameters can be passed as part of the CBC encryption routine
But any CBC Compatible routine will work.
Rijndael This is the AES (Advanced Encryption Scheme) routine. You need Crypt::Rijndael for this. DES This is the DES routine. You need Crypt::DES for this. IDEA This is the IDEA routine. You need Crypt::IDEA for this. Blowfish This is the Blowfish routine. You need Crypt::Blowfish for this. GOST This is the GOST routine. You need Crypt::GOST for this. DES_EDE3 This is the Triple DES routine. You need Crypt::DES_EDE3 for this. Twofish This is the Twofish routine. You need Crypt::Twofish for this. NULL This is the NULL routine. You need Crypt::NULL for this. TEA This is the TEA routine. You need Crypt::TEA for this. RC6 This is the RC6 routine. You need Crypt::RC6 for this. Serpent This is the Serpent routine. You need Crypt::Serpent for this. (Untested)
As Paul Marquess noted, Filter has no problems with binary data. The text handlers are totally unnecesary. I therefor removed them. You can still use hex encoding by using the Filter::Hex module provided in the obsolete directory. If you have code that used the older version of Filter::CBC, I recommend stacking the HEX filter. Edit the use statement as follows :
use Filter::Hex; use Filter::CBC "Rijndael","my secret key";
Since Filter::CBC 0.04, using code2cbc isnt required anymore. Filter::CBC can encrypt your code on the fly if its not yet encrypted. Be warned that your source file is overwritten. You can use cbc2code.pl to decrypt your encrypted code. BACKUP!
use Filter::CBC "Rijndael","my secret key"; # This file will be encrypted and overwritten. # Make backups, damnit! # Autofilter example print "Dont try this at home, kids !";
This code will be encrypted the first time you run it. Everything before the use Filter::CBC line is kept intact. Filter::CBC sets a marker so that double encryption doesnt occur. If you see a comment stating This space is left blank intentionally, ignore it.
This space is left blank intentionally
Encryption routine Filter::CBC will use Rijndael when no encryption algorithm is defined. Keyphrase Filter::CBC will use the following line when no keyphrase is defined :
Filter::CBC requires the following modules (depending on your needs)
Filter::Util::Call Crypt::CBC Crypt::Rijndael Crypt::DES Crypt::IDEA Crypt::Blowfish Crypt::GOST Crypt::DES_EDE3 Crypt::Twofish Crypt::NULL Crypt::TEA Crypt::RC6 Crypt::Serpent
Alot of thanks to Ray Brinzer (Petruchio on Perlmonks) for giving an example on how to handle parameters with use.
Paul Marquess for writing Filter and pointing out that Filter does what it should and not what I expect it to.
A bunch of monks at Perlmonks for giving some excellent and well appreciated feedback on detecting code. Thank you Blakem, Petral, Chipmunk, Tilly, Jepri and Zaxo.
This code is released under GPL (GNU Public License). More information can be found on http://www.gnu.org/copyleft/gpl.html
This is Filter::CBC 0.09
Hendrik Van Belleghem (beatnik -at- quickndirty -dot- org)
GNU & GPL - http://www.gnu.org/copyleft/gpl.html
Filter::Util::Call - http://search.cpan.org/search?dist=Filter
Crypt::CBC - http://search.cpan.org/search?dist=Crypt-CBC
Crypt::Rijndael - http://search.cpan.org/search?dist=Crypt-Rijndael
Crypt::DES - http://search.cpan.org/search?dist=Crypt-DES
Crypt::IDEA - http://search.cpan.org/search?dist=Crypt-IDEA
Crypt::Blowfish - http://search.cpan.org/search?dist=Crypt-Blowfish
Crypt::GOST - http://search.cpan.org/search?dist=Crypt-GOST
Crypt::DES_EDE3 - http://search.cpan.org/search?dist=Crypt-DES_EDE3
Crypt::Twofish - http://search.cpan.org/search?dist=Crypt-Twofish
Crypt::NULL - http://search.cpan.org/search?dist=Crypt-NULL
Crypt::TEA - http://search.cpan.org/search?dist=Crypt-TEA
Crypt::RC6 - http://search.cpan.org/search?dist=Crypt-RC6
Crypt::Serpent - http://search.cpan.org/search?dist=Crypt-Serpent
Paul Marquess article on Source Filters - http://www.samag.com/documents/s=1287/sam03030004/
|perl v5.20.3||FILTER::CBC (3)||2007-09-18|