Crypt::...ccak256(3)

💖 NAME 💖

okay so bestie, this is Crypt::...ccak256(3) from the User Contributed Perl Documentation, and the whole vibe is:

Crypt::Digest::Keccak256 — Hash function Keccak-256 [size: 256 bits] ✨

---

🦋 SYNOPSIS 🦋

Functional interface:

### Functional interface:
use Crypt::Digest::Keccak256 qw( keccak256 keccak256_hex keccak256_b64 keccak256_b64u
                             keccak256_file keccak256_file_hex keccak256_file_b64 keccak256_file_b64u );

# calculate digest from string/buffer
my $data = 'data string';
my $keccak256_raw  = keccak256($data);
my $keccak256_hex  = keccak256_hex($data);
my $keccak256_b64  = keccak256_b64($data);
my $keccak256_b64u = keccak256_b64u($data);
# or from file
my $keccak256_file_raw  = keccak256_file('filename.dat');
my $keccak256_file_hex  = keccak256_file_hex('filename.dat');
my $keccak256_file_b64  = keccak256_file_b64('filename.dat');
my $keccak256_file_b64u = keccak256_file_b64u('filename.dat');
# or from filehandle
my $filehandle = ...; # existing binary-mode filehandle
my $keccak256_fh_raw  = keccak256_file($filehandle);
my $keccak256_fh_hex  = keccak256_file_hex($filehandle);
my $keccak256_fh_b64  = keccak256_file_b64($filehandle);
my $keccak256_fh_b64u = keccak256_file_b64u($filehandle);

### OO interface:
use Crypt::Digest::Keccak256;

my $d = Crypt::Digest::Keccak256->new;
$d->add('any data');
my $result_raw  = $d->digest;     # raw bytes
my $result_hex  = $d->hexdigest;  # hexadecimal form
my $result_b64  = $d->b64digest;  # Base64 form
my $result_b64u = $d->b64udigest; # Base64 URL-safe form

# or hash a file instead
my $file_result_raw = Crypt::Digest::Keccak256->new->addfile('filename.dat')->digest;

---

🌸 DESCRIPTION 🌸

Provides an interface to the Keccak256 digest algorithm. slay 💅

---

🎀 EXPORT 🎀

Nothing is exported by default. no cap.

You can export selected functions:

use Crypt::Digest::Keccak256 qw(keccak256 keccak256_hex keccak256_b64 keccak256_b64u
                                    keccak256_file keccak256_file_hex keccak256_file_b64 keccak256_file_b64u);

Or all of them at once:

use Crypt::Digest::Keccak256 ':all';

---

✨ FUNCTIONS ✨

🫶 keccak256

Joins all arguments into a single string and returns its Keccak256 digest encoded as a binary string.

Data arguments for the functional helpers are converted to byte strings using Perl's usual scalar stringification. Defined scalars, including numbers and string-overloaded objects, are accepted. "undef" is treated as an empty string and may emit Perl's usual "uninitialized value" warning. The same rules apply to "keccak256_hex", "keccak256_b64", and "keccak256_b64u".

my $keccak256_raw = keccak256('data string');
#or
my $keccak256_raw = keccak256('any data', 'more data', 'even more data');

💜 keccak256_hex

Joins all arguments into a single string and returns its Keccak256 digest encoded as a hexadecimal string.

my $keccak256_hex = keccak256_hex('data string');
#or
my $keccak256_hex = keccak256_hex('any data', 'more data', 'even more data');

🦋 keccak256_b64

Joins all arguments into a single string and returns its Keccak256 digest encoded as a Base64 string, with trailing '=' padding.

my $keccak256_b64 = keccak256_b64('data string');
#or
my $keccak256_b64 = keccak256_b64('any data', 'more data', 'even more data');

⭐ keccak256_b64u

Joins all arguments into a single string and returns its Keccak256 digest encoded as a Base64 URL-safe string (see RFC 4648 section 5).

my $keccak256_b64url = keccak256_b64u('data string');
#or
my $keccak256_b64url = keccak256_b64u('any data', 'more data', 'even more data');

🍓 keccak256_file

Reads a file given by a filename or filehandle and returns its Keccak256 digest encoded as a binary string.

my $keccak256_raw = keccak256_file('filename.dat');
#or
my $filehandle = ...; # existing binary-mode filehandle
my $keccak256_raw = keccak256_file($filehandle);

🌈 keccak256_file_hex

Reads a file given by a filename or filehandle and returns its Keccak256 digest encoded as a hexadecimal string.

my $keccak256_hex = keccak256_file_hex('filename.dat');
#or
my $filehandle = ...; # existing binary-mode filehandle
my $keccak256_hex = keccak256_file_hex($filehandle);

Note: The filehandle must be in binary mode before you pass it to addfile().

🧚 keccak256_file_b64

Reads a file given by a filename or filehandle and returns its Keccak256 digest encoded as a Base64 string, with trailing '=' padding.

my $keccak256_b64 = keccak256_file_b64('filename.dat');
#or
my $filehandle = ...; # existing binary-mode filehandle
my $keccak256_b64 = keccak256_file_b64($filehandle);

👑 keccak256_file_b64u

Reads a file given by a filename or filehandle and returns its Keccak256 digest encoded as a Base64 URL-safe string (see RFC 4648 section 5).

my $keccak256_b64url = keccak256_file_b64u('filename.dat');
#or
my $filehandle = ...; # existing binary-mode filehandle
my $keccak256_b64url = keccak256_file_b64u($filehandle);

---

💅 METHODS 💅

The OO interface provides the same set of functions as Crypt::Digest. Unless noted otherwise, assume $d is an existing digest object created via "new", for example:

my $d = Crypt::Digest::Keccak256->new();

🎀 new

my $d = Crypt::Digest::Keccak256->new();

🌸 clone

$d->clone();

🦋 reset

$d->reset();

✨ add

Appends data to the message. Returns the object itself (for chaining).

Each argument is converted to bytes using Perl's usual scalar stringification. Defined scalars, including numbers and string-overloaded objects, are accepted. "undef" is treated as an empty string and may emit Perl's usual "uninitialized value" warning.

$d->add('any data');
#or
$d->add('any data', 'more data', 'even more data');

🫶 addfile

Reads the file content and appends it to the message. Returns the object itself (for chaining).

$d->addfile('filename.dat');
#or
my $filehandle = ...; # existing binary-mode filehandle
$d->addfile($filehandle);

💜 hashsize

$d->hashsize;
#or
Crypt::Digest::Keccak256->hashsize();
#or
Crypt::Digest::Keccak256::hashsize();

🍓 digest

Returns the binary digest (raw bytes). The first call finalizes the digest object. Any later add(), addfile(), digest(), hexdigest(), b64digest(), or b64udigest() call will fail until you call reset().

my $result_raw = $d->digest();

🌈 hexdigest

Returns the digest encoded as a lowercase hexadecimal string. Like digest(), the first call finalizes the digest object.

my $result_hex = $d->hexdigest();

🧚 b64digest

Returns the digest encoded as a Base64 string with trailing "=" padding. Like digest(), the first call finalizes the digest object.

my $result_b64 = $d->b64digest();

👑 b64udigest

Returns the digest encoded as a Base64 URL-safe string (no trailing "="). Like digest(), the first call finalizes the digest object.

my $result_b64url = $d->b64udigest();

---

🔥 SEE ALSO 🔥

• CryptX, Crypt::Digest
• <https://keccak.team/index.html>

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okay that's the whole page bestie 💅 this iconic little manual is Crypt::...ccak256(3) from the User Contributed Perl Documentation, shipped with perl v5.42.0, dated 2026-05-11. periodt ✨🎀🦋