NAME

       Crypt::Mac::HMAC - Message authentication code HMAC

SYNOPSIS

          ### Functional interface:
          use Crypt::Mac::HMAC qw( hmac hmac_hex );

          # calculate MAC from string/buffer
          $hmac_raw  = hmac('SHA256', $key, 'data buffer');
          $hmac_hex  = hmac_hex('SHA256', $key, 'data buffer');
          $hmac_b64  = hmac_b64('SHA256', $key, 'data buffer');
          $hmac_b64u = hmac_b64u('SHA256', $key, 'data buffer');

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

          $d = Crypt::Mac::HMAC->new('SHA256', $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 HMAC message authentication code (MAC) algorithm.

EXPORT

       Nothing is exported by default.

       You can export selected functions:

         use Crypt::Mac::HMAC qw(hmac hmac_hex );

       Or all of them at once:

         use Crypt::Mac::HMAC ':all';

FUNCTIONS

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

        $hmac_raw = hmac($hash_name, $key, 'data buffer');
        #or
        $hmac_raw = hmac($hash_name, $key, 'any data', 'more data', 'even more data');

        # $hash_name ... any <NAME> for which there exists Crypt::Digest::<NAME>
        # $key ......... the key (octets/bytes)

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

        $hmac_hex = hmac_hex($hash_name, $key, 'data buffer');
        #or
        $hmac_hex = hmac_hex($hash_name, $key, 'any data', 'more data', 'even more data');

        # $hash_name ... any <NAME> for which there exists Crypt::Digest::<NAME>
        # $key ......... the key (octets/bytes, not hex!)

   hmac_b64
       Logically joins all arguments into a single string, and returns its HMAC message
       authentication code encoded as a Base64 string.

        $hmac_b64 = hmac_b64($hash_name, $key, 'data buffer');
        #or
        $hmac_b64 = hmac_b64($hash_name, $key, 'any data', 'more data', 'even more data');

        # $hash_name ... any <NAME> for which there exists Crypt::Digest::<NAME>
        # $key ......... the key (octets/bytes, not Base64!)

   hmac_b64u
       Logically joins all arguments into a single string, and returns its HMAC message
       authentication code encoded as a Base64 URL Safe string (see RFC 4648 section 5).

        $hmac_b64url = hmac_b64u($hash_name, $key, 'data buffer');
        #or
        $hmac_b64url = hmac_b64u($hash_name, $key, 'any data', 'more data', 'even more data');

        # $hash_name ... any <NAME> for which there exists Crypt::Digest::<NAME>
        # $key ......... the key (octets/bytes, not Base64url!)

METHODS

   new
        $d = Crypt::Mac::HMAC->new($hash_name, $key);

        # $hash_name ... any <NAME> for which there exists Crypt::Digest::<NAME>
        # $key ......... the key (octets/bytes)

   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/Hmac>

       •   <https://tools.ietf.org/html/rfc2104>