info > Crypt::Mode::OFB

man perldoc info pydoc3 ri search

📋 NAME

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

🚀 Quick Reference

Use Case	Command	Description
🔐 Encrypt at once	$m->encrypt($plaintext, $key, $iv)	Encrypt entire plaintext with key and IV
🔓 Decrypt at once	$m->decrypt($ciphertext, $key, $iv)	Decrypt entire ciphertext with key and IV
📦 Encrypt in chunks	$m->start_encrypt($key, $iv); $m->add('data')	Initialize encryption, then add data chunks
📦 Decrypt in chunks	$m->start_decrypt($key, $iv); $m->add($ciphertext)	Initialize decryption, then add ciphertext chunks

📖 SYNOPSIS

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);

📝 DESCRIPTION

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

🔧 METHODS

🆕 new

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

🔒 encrypt

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

🔓 decrypt

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

▶️ start_encrypt

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

⏹️ start_decrypt

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

➕ add

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

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

📚 SEE ALSO

• 🔗 CryptX, Crypt::Cipher
• 🔗 Crypt::Cipher::AES, Crypt::Cipher::Blowfish, ...
• 🔗 <https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Output_feedback_.28OFB.29>

perl v5.34.0 2022-02-06 Crypt::Mode::OFB(3pm)

📋 NAME 🚀 Quick Reference 📖 SYNOPSIS 📝 DESCRIPTION 🔧 METHODS 📚 SEE ALSO