man > Crypt::Mac::HMAC

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📛 NAME

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

🚀 Quick Reference

Use Case	Command	Description
Raw HMAC (binary)	hmac('SHA256', $key, $data)	Returns raw bytes
Hex‑encoded HMAC	hmac_hex('SHA256', $key, $data)	Lowercase hex string
Base64 HMAC	hmac_b64('SHA256', $key, $data)	Standard Base64
Base64 URL‑safe	hmac_b64u('SHA256', $key, $data)	URL‑safe Base64
OO new instance	Crypt::Mac::HMAC->new('SHA256', $key)	Object‑oriented interface
Add data	$d->add('data')	Accumulate data chunks
Finalize (binary)	$d->mac	Return raw MAC
Finalize (hex)	$d->hexmac	Return hex MAC

📖 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
• 🌐 HMAC on Wikipedia
• 📜 RFC 2104 — HMAC

📛 NAME 🚀 Quick Reference 📖 SYNOPSIS 📘 DESCRIPTION 📤 EXPORT ⚙️ FUNCTIONS 🛠️ METHODS 📚 SEE ALSO