Crypt::AuthEnc::OCB - Authenticated encryption in OCBv3 mode
### OO interface use Crypt::AuthEnc::OCB; # encrypt and authenticate my $ae = Crypt::AuthEnc::OCB->new("AES", $key, $nonce); $ae->aad_add('additional_authenticated_data1'); $ae->aad_add('additional_authenticated_data2'); $ct = $ae->encrypt_add('data1'); $ct = $ae->encrypt_add('data2'); $ct = $ae->encrypt_add('data3'); $ct = $ae->encrypt_last('rest of data'); ($ct,$tag) = $ae->encrypt_done(); # decrypt and verify my $ae = Crypt::AuthEnc::OCB->new("AES", $key, $nonce); $ae->aad_add('additional_authenticated_data1'); $ae->aad_add('additional_authenticated_data2'); $pt = $ae->decrypt_add('ciphertext1'); $pt = $ae->decrypt_add('ciphertext2'); $pt = $ae->decrypt_add('ciphertext3'); $pt = $ae->decrypt_last('rest of data'); ($pt,$tag) = $ae->decrypt_done(); ### functional interface use Crypt::AuthEnc::OCB qw(ocb_encrypt_authenticate ocb_decrypt_verify); my ($ciphertext, $tag) = ocb_encrypt_authenticate('AES', $key, $nonce, $adata, $plaintext); my $plaintext = ocb_decrypt_verify('AES', $key, $nonce, $adata, $ciphertext, $tag);
This module implements OCB version 3 according http://datatracker.ietf.org/doc/draft-irtf-cfrg-ocb/
Nothing is exported by default.
You can export selected functions:
use Crypt::AuthEnc::OCB qw(ocb_encrypt_authenticate ocb_decrypt_verify);
my ($ciphertext, $tag) = ocb_encrypt_authenticate($cipher, $key, $nonce, $adata, $plaintext); # $cipher .. 'AES' or name of any other cipher with 16-byte block len # $key ..... AES key of proper length (128/192/256bits) # $nonce ... unique nonce/salt (no need to keep it secret) # $adata ... additional authenticated data
my $plaintext = ocb_decrypt_verify($cipher, $key, $nonce, $adata, $ciphertext, $tag); # on error returns undef
my $ae = Crypt::AuthEnc::OCB->new($cipher, $key, $nonce); # $cipher .. 'AES' or name of any other cipher with 16-byte block len # $key ..... AES key of proper length (128/192/256bits) # $nonce ... unique nonce/salt (no need to keep it secret)
$ae->aad_add($adata); #can be called multiple times
$ciphertext = $ae->encrypt_add($data); #can be called multiple times #BEWARE: size of $data has to be multiple of blocklen (16 for AES)
$ciphertext = $ae->encrypt_last($data);
$tag = $ae->encrypt_done();
$plaintext = $ae->decrypt_add($ciphertext); #can be called multiple times #BEWARE: size of $ciphertext has to be multiple of blocklen (16 for AES)
$plaintext = $ae->decrypt_last($data);
my $result = $ae->decrypt_done($tag); # returns 1 (success) or 0 (failure) #or my $tag = $ae->decrypt_done; # returns $tag value
my $ae_new = $ae->clone;
CryptX, Crypt::AuthEnc::CCM, Crypt::AuthEnc::GCM, Crypt::AuthEnc::EAX
https://en.wikipedia.org/wiki/OCB_mode
To install CryptX, copy and paste the appropriate command in to your terminal.
cpanm
cpanm CryptX
CPAN shell
perl -MCPAN -e shell install CryptX
For more information on module installation, please visit the detailed CPAN module installation guide.