Crypt::AuthEnc::EAX - Authenticated encryption in EAX mode
### example 1 use Crypt::AuthEnc::EAX; # encrypt + authenticate my $ae = Crypt::AuthEnc::EAX->new("AES", $key, $nonce); $ae->header_add('headerdata part1'); $ae->header_add('headerdata part2'); $ct = $ae->encrypt_add('data1'); $ct = $ae->encrypt_add('data2'); $ct = $ae->encrypt_add('data3'); $tag = $ae->encrypt_done(); # decrypt + verify my $ae = Crypt::AuthEnc::EAX->new("AES", $key, $nonce); $ae->header_add('headerdata part1'); $ae->header_add('headerdata part2'); $pt = $ae->decrypt_add('ciphertext1'); $pt = $ae->decrypt_add('ciphertext2'); $pt = $ae->decrypt_add('ciphertext3'); my $result = $ae->decrypt_done($tag); #or my $tag_dec = $ae->decrypt_done; die "TAG mismatch" unless $tag eq $tag_dec; ### example 2 use Crypt::AuthEnc::EAX qw(eax_encrypt_authenticate eax_decrypt_verify); my ($ciphertext, $tag) = eax_encrypt_authenticate('AES', $key, $nonce, $header, $plaintext); my $plaintext = eax_decrypt_verify('AES', $key, $nonce, $header, $ciphertext, $tag);
EAX is a mode that requires a cipher, CTR and OMAC support and provides encryption and authentication. It is initialized with a random nonce that can be shared publicly, a header which can be fixed and public, and a random secret symmetric key.
Nothing is exported by default.
You can export selected functions:
use Crypt::AuthEnc::EAX qw(eax_encrypt_authenticate eax_decrypt_verify);
my ($ciphertext, $tag) = eax_encrypt_authenticate($cipher, $key, $nonce, $header, $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) # $header .. meta-data you want to send with the message but not have encrypted
my $plaintext = eax_decrypt_verify($cipher, $key, $nonce, $header, $ciphertext, $tag); # on error returns undef
my $ae = Crypt::AuthEnc::EAX->new($cipher, $key, $nonce); #or my $ae = Crypt::AuthEnc::EAX->new($cipher, $key, $nonce, $header); # $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) # $header .. meta-data you want to send with the message but not have encrypted
$ae->header_add($header_data); #can be called multiple times
$ciphertext = $ae->encrypt_add($data); #can be called multiple times
$tag = $ae->encrypt_done();
$plaintext = $ae->decrypt_add($ciphertext); #can be called multiple times
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::Mode::CCM, Crypt::Mode::GCM, Crypt::Mode::OCB
https://en.wikipedia.org/wiki/EAX_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.