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>