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CryptX-0.055_001
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/ Crypt::Mac::BLAKE2b
Security Advisories (4)
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.

CVE-2026-41564 (2026-04-23)

CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking. The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery. This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process.

NAME

Crypt::Mac::BLAKE2b - Message authentication code BLAKE2b MAC (RFC 7693)

SYNOPSIS

### Functional interface:
use Crypt::Mac::BLAKE2b qw( blake2b blake2b_hex );

# calculate MAC from string/buffer
$blake2b_raw  = blake2b($size, $key, 'data buffer');
$blake2b_hex  = blake2b_hex($size, $key, 'data buffer');
$blake2b_b64  = blake2b_b64($size, $key, 'data buffer');
$blake2b_b64u = blake2b_b64u($size, $key, 'data buffer');

### OO interface:
use Crypt::Mac::BLAKE2b;

$d = Crypt::Mac::BLAKE2b->new($size, $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 BLAKE2b message authentication code (MAC) algorithm.

EXPORT

Nothing is exported by default.

You can export selected functions:

use Crypt::Mac::BLAKE2b qw(blake2b blake2b_hex );

Or all of them at once:

use Crypt::Mac::BLAKE2b ':all';

FUNCTIONS

blake2b

Logically joins all arguments into a single string, and returns its BLAKE2b message authentication code encoded as a binary string.

$blake2b_raw = blake2b($size, $key, 'data buffer');
#or
$blake2b_raw = blake2b($size, $key, 'any data', 'more data', 'even more data');

blake2b_hex

Logically joins all arguments into a single string, and returns its BLAKE2b message authentication code encoded as a hexadecimal string.

$blake2b_hex = blake2b_hex($size, $key, 'data buffer');
#or
$blake2b_hex = blake2b_hex($size, $key, 'any data', 'more data', 'even more data');

blake2b_b64

Logically joins all arguments into a single string, and returns its BLAKE2b message authentication code encoded as a Base64 string.

$blake2b_b64 = blake2b_b64($size, $key, 'data buffer');
#or
$blake2b_b64 = blake2b_b64($size, $key, 'any data', 'more data', 'even more data');

blake2b_b64u

Logically joins all arguments into a single string, and returns its BLAKE2b message authentication code encoded as a Base64 URL Safe string (see RFC 4648 section 5).

$blake2b_b64url = blake2b_b64u($size, $key, 'data buffer');
#or
$blake2b_b64url = blake2b_b64u($size, $key, 'any data', 'more data', 'even more data');

METHODS

new

$d = Crypt::Mac::BLAKE2b->new($size, $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