Crypt::...E2b_256(3)

📦
version 0.89.0 · 16 versions
, in opensuse-leap 16.0

okay so bestie, welcome to the Crypt::...E2b_256(3) manual page — yes, it’s giving User Contributed Perl Documentation energy, and we’re gonna make it make sense 💅✨

🌸 NAME 🌸

Crypt::Digest::BLAKE2b_256 — Hash function BLAKE2b [size: 256 bits] 🦋

✨ SYNOPSIS ✨

ok so there are two whole vibes here: the functional interface and the OO interface. both are valid, both are iconic, pick your main character energy:

          ### Functional interface:
          use Crypt::Digest::BLAKE2b_256 qw( blake2b_256 blake2b_256_hex blake2b_256_b64 blake2b_256_b64u
                                       blake2b_256_file blake2b_256_file_hex blake2b_256_file_b64 blake2b_256_file_b64u );

          # calculate digest from string/buffer
          my $data = 'data string';
          my $blake2b_256_raw  = blake2b_256($data);
          my $blake2b_256_hex  = blake2b_256_hex($data);
          my $blake2b_256_b64  = blake2b_256_b64($data);
          my $blake2b_256_b64u = blake2b_256_b64u($data);
          # or from file
          my $blake2b_256_file_raw  = blake2b_256_file('filename.dat');
          my $blake2b_256_file_hex  = blake2b_256_file_hex('filename.dat');
          my $blake2b_256_file_b64  = blake2b_256_file_b64('filename.dat');
          my $blake2b_256_file_b64u = blake2b_256_file_b64u('filename.dat');
          # or from filehandle
          my $filehandle = ...; # existing binary-mode filehandle
          my $blake2b_256_fh_raw  = blake2b_256_file($filehandle);
          my $blake2b_256_fh_hex  = blake2b_256_file_hex($filehandle);
          my $blake2b_256_fh_b64  = blake2b_256_file_b64($filehandle);
          my $blake2b_256_fh_b64u = blake2b_256_file_b64u($filehandle);

          ### OO interface:
          use Crypt::Digest::BLAKE2b_256;

          my $d = Crypt::Digest::BLAKE2b_256->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::BLAKE2b_256->new->addfile('filename.dat')->digest;

🦋 DESCRIPTION 🦋

bestie, this module literally provides an interface to the BLAKE2b_256 digest algorithm. that’s the whole assignment. hash it, digest it, slay it 💖

🎀 EXPORT 🎀

Nothing is exported by default. no surprise pop-in, no auto-import chaos. periodt.

you can export selected functions, like a curated little bestie list:

         use Crypt::Digest::BLAKE2b_256 qw(blake2b_256 blake2b_256_hex blake2b_256_b64 blake2b_256_b64u
                                             blake2b_256_file blake2b_256_file_hex blake2b_256_file_b64 blake2b_256_file_b64u);

or all of them at once, go full main character:

         use Crypt::Digest::BLAKE2b_256 ':all';

💜 FUNCTIONS 💜

💅 blake2b_256

joins all arguments into a single string and returns its BLAKE2b_256 digest encoded as a binary string. raw bytes, no extra decoding, very direct.

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 blake2b_256_hex, blake2b_256_b64, and blake2b_256_b64u.

 my $blake2b_256_raw = blake2b_256('data string');
 #or
 my $blake2b_256_raw = blake2b_256('any data', 'more data', 'even more data');

💅 blake2b_256_hex

joins all arguments into a single string and returns its BLAKE2b_256 digest encoded as a hexadecimal string. yes bestie, little hex letters, very readable, very aesthetic.

 my $blake2b_256_hex = blake2b_256_hex('data string');
 #or
 my $blake2b_256_hex = blake2b_256_hex('any data', 'more data', 'even more data');

💅 blake2b_256_b64

joins all arguments into a single string and returns its BLAKE2b_256 digest encoded as a Base64 string, with trailing = padding. the padding is part of the look, don’t come for it.

 my $blake2b_256_b64 = blake2b_256_b64('data string');
 #or
 my $blake2b_256_b64 = blake2b_256_b64('any data', 'more data', 'even more data');

💅 blake2b_256_b64u

joins all arguments into a single string and returns its BLAKE2b_256 digest encoded as a Base64 URL-safe string (see RFC 4648 section 5). URL-safe b64 is that girl.

 my $blake2b_256_b64url = blake2b_256_b64u('data string');
 #or
 my $blake2b_256_b64url = blake2b_256_b64u('any data', 'more data', 'even more data');

💅 blake2b_256_file

reads a file given by a filename or filehandle and returns its BLAKE2b_256 digest encoded as a binary string. file go in, raw digest comes out, no cap.

 my $blake2b_256_raw = blake2b_256_file('filename.dat');
 #or
 my $filehandle = ...; # existing binary-mode filehandle
 my $blake2b_256_raw = blake2b_256_file($filehandle);

💅 blake2b_256_file_hex

reads a file given by a filename or filehandle and returns its BLAKE2b_256 digest encoded as a hexadecimal string.

 my $blake2b_256_hex = blake2b_256_file_hex('filename.dat');
 #or
 my $filehandle = ...; # existing binary-mode filehandle
 my $blake2b_256_hex = blake2b_256_file_hex($filehandle);
note bestie: The filehandle must be in binary mode before you pass it to addfile(). do not skip this, it’s giving cautionary tale energy 😭

💅 blake2b_256_file_b64

reads a file given by a filename or filehandle and returns its BLAKE2b_256 digest encoded as a Base64 string, with trailing = padding. cute, padded, correct.

 my $blake2b_256_b64 = blake2b_256_file_b64('filename.dat');
 #or
 my $filehandle = ...; # existing binary-mode filehandle
 my $blake2b_256_b64 = blake2b_256_file_b64($filehandle);

💅 blake2b_256_file_b64u

reads a file given by a filename or filehandle and returns its BLAKE2b_256 digest encoded as a Base64 URL-safe string (see RFC 4648 section 5).

 my $blake2b_256_b64url = blake2b_256_file_b64u('filename.dat');
 #or
 my $filehandle = ...; # existing binary-mode filehandle
 my $blake2b_256_b64url = blake2b_256_file_b64u($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::BLAKE2b_256->new();

👑 new

 my $d = Crypt::Digest::BLAKE2b_256->new();

👑 clone

 $d->clone();

👑 reset

 $d->reset();

👑 add

appends data to the message. returns the object itself (for chaining), so you can keep stacking calls like a group chat.

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). file content said “add me to the message,” and it did.

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

👑 hashsize

 $d->hashsize;
 #or
 Crypt::Digest::BLAKE2b_256->hashsize();
 #or
 Crypt::Digest::BLAKE2b_256::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(). so yeah, after it’s finalized, it’s finalized — no sneaky extra calls, bestie 💀

 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 ⭐

okay that’s the whole page, bestie 🫶 source/version: perl v5.42.0 · date: 2026-05-11 · and yes, this was Crypt::...E2b_256(3) — mwah 💋🎀

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