/ 
CryptX-0.005
River stage three • 89 direct dependents • 391 total dependents
/ Crypt::Mac::OMAC
Security Advisories (3)
CVE-2018-25099 (2018-10-26)

A user can pass anything as the tag into gcm_decrypt_verify() and it will return decrypted plaintext.

CVE-2025-40912 (2025-06-11)

CryptX for Perl before version 0.065 contains a dependency that may be susceptible to malformed unicode. CryptX embeds the tomcrypt library. The versions of that library in CryptX before 0.065 may be susceptible to CVE-2019-17362.

CVE-2025-40914 (2025-06-11)

Perl CryptX before version 0.087 contains a dependency that may be susceptible to an integer overflow. CryptX embeds a version of the libtommath library that is susceptible to an integer overflow associated with CVE-2023-36328.

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 string');
$omac_hex = omac_hex($cipher_name, $key, 'data string');
$omac_b64 = omac_b64($cipher_name, $key, 'data string');

### 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

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 string');
#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.

$omac_hex = omac($cipher_name, $key, 'data string');
#or
$omac_hex = omac($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.

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

METHODS

The OO interface provides the same set of functions as Crypt::Mac.

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_base64 = $d->b64mac();

SEE ALSO

CryptX, Crypt::Mac