Crypt::Mac::OMAC(3)

NAME
Crypt::Mac::OMAC - Message authentication code OMAC

SYNOPSIS
   ### Functional interface:
   use Crypt::Mac::OMAC qw( omac omac_hex );

   # calculate MAC from string/buffer
   $omac_raw  = omac($cipher_name, $key, 'data buffer');
   $omac_hex  = omac_hex($cipher_name, $key, 'data buffer');
   $omac_b64  = omac_b64($cipher_name, $key, 'data buffer');
   $omac_b64u = omac_b64u($cipher_name, $key, 'data buffer');

   ### OO interface:
   use Crypt::Mac::OMAC;

   $d = Crypt::Mac::OMAC->new($cipher_name, $key);
   $d->add('any data');
   $d->addfile('filename.dat');
   $d->addfile(*FILEHANDLE);
   $result_raw  = $d->mac;     # raw bytes
   $result_hex  = $d->hexmac;  # hexadecimal form
   $result_b64  = $d->b64mac;  # Base64 form
   $result_b64u = $d->b64umac; # Base64 URL Safe form

DESCRIPTION
Provides an interface to the OMAC message authentication code (MAC) algorithm.

EXPORT
Nothing is exported by default.

You can export selected functions:

  use Crypt::Mac::OMAC qw(omac omac_hex );

Or all of them at once:

  use Crypt::Mac::OMAC ':all';

FUNCTIONS

  omac
Logically joins all arguments into a single string, and returns its OMAC message authentication code encoded as a binary string.

 $omac_raw = omac($cipher_name, $key, 'data buffer');
 #or
 $omac_raw = omac($cipher_name, $key, 'any data', 'more data', 'even more data');

  omac_hex
Logically joins all arguments into a single string, and returns its OMAC message authentication code encoded as a hexadecimal string.

 $omac_hex = omac_hex($cipher_name, $key, 'data buffer');
 #or
 $omac_hex = omac_hex($cipher_name, $key, 'any data', 'more data', 'even more data');

  omac_b64
Logically joins all arguments into a single string, and returns its OMAC message authentication code encoded as a Base64 string.

 $omac_b64 = omac_b64($cipher_name, $key, 'data buffer');
 #or
 $omac_b64 = omac_b64($cipher_name, $key, 'any data', 'more data', 'even more data');

  omac_b64u
Logically joins all arguments into a single string, and returns its OMAC message authentication code encoded as a Base64 URL Safe string (see RFC 4648 section 5).

 $omac_b64url = omac_b64u($cipher_name, $key, 'data buffer');
 #or
 $omac_b64url = omac_b64u($cipher_name, $key, 'any data', 'more data', 'even more data');

METHODS

  new
 $d = Crypt::Mac::OMAC->new($cipher_name, $key);

  clone
 $d->clone();

  reset
 $d->reset();

  add
 $d->add('any data');
 #or
 $d->add('any data', 'more data', 'even more data');

  addfile
 $d->addfile('filename.dat');
 #or
 $d->addfile(*FILEHANDLE);

  mac
 $result_raw = $d->mac();

  hexmac
 $result_hex = $d->hexmac();

  b64mac
 $result_b64 = $d->b64mac();

  b64umac
 $result_b64url = $d->b64umac();

SEE ALSO

•   CryptX

•   <https://en.wikipedia.org/wiki/OMAC_%28cryptography%29>