GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
Crypt::Mode::OFB(3) User Contributed Perl Documentation Crypt::Mode::OFB(3)

Crypt::Mode::OFB - Block cipher mode OFB [Output feedback]

   use Crypt::Mode::OFB;
   my $m = Crypt::Mode::OFB->new('AES');

   #(en|de)crypt at once
   my $ciphertext = $m->encrypt($plaintext, $key, $iv);
   my $plaintext = $m->decrypt($ciphertext, $key, $iv);

   #encrypt more chunks
   $m->start_encrypt($key, $iv);
   my $ciphertext = $m->add('some data');
   $ciphertext .= $m->add('more data');

   #decrypt more chunks
   $m->start_decrypt($key, $iv);
   my $plaintext = $m->add($some_ciphertext);
   $plaintext .= $m->add($more_ciphertext);

This module implements OFB cipher mode. NOTE: it works only with ciphers from CryptX (Crypt::Cipher::NNNN).

 my $m = Crypt::Mode::OFB->new($name);
 #or
 my $m = Crypt::Mode::OFB->new($name, $cipher_rounds);

 # $name ............ one of 'AES', 'Anubis', 'Blowfish', 'CAST5', 'Camellia', 'DES', 'DES_EDE',
 #                    'KASUMI', 'Khazad', 'MULTI2', 'Noekeon', 'RC2', 'RC5', 'RC6',
 #                    'SAFERP', 'SAFER_K128', 'SAFER_K64', 'SAFER_SK128', 'SAFER_SK64',
 #                    'SEED', 'Skipjack', 'Twofish', 'XTEA', 'IDEA', 'Serpent'
 #                    simply any <NAME> for which there exists Crypt::Cipher::<NAME>
 # $cipher_rounds ... optional num of rounds for given cipher

   my $ciphertext = $m->encrypt($plaintext, $key, $iv);

   my $plaintext = $m->decrypt($ciphertext, $key, $iv);

   $m->start_encrypt($key, $iv);

   $m->start_decrypt($key, $iv);

   # in encrypt mode
   my $plaintext = $m->add($ciphertext);

   # in decrypt mode
   my $ciphertext = $m->add($plaintext);

  • CryptX, Crypt::Cipher
  • Crypt::Cipher::AES, Crypt::Cipher::Blowfish, ...
  • <https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Output_feedback_.28OFB.29>
2022-01-07 perl v5.32.1

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.