Crypt::Digest::Keccak256(3)

User Contributed Perl Documentation

Crypt::Digest::Keccak256(3)

NAME

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

SYNOPSIS

### 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
$keccak256_raw  = keccak256('data string');
$keccak256_hex  = keccak256_hex('data string');
$keccak256_b64  = keccak256_b64('data string');
$keccak256_b64u = keccak256_b64u('data string');
# calculate digest from file
$keccak256_raw  = keccak256_file('filename.dat');
$keccak256_hex  = keccak256_file_hex('filename.dat');
$keccak256_b64  = keccak256_file_b64('filename.dat');
$keccak256_b64u = keccak256_file_b64u('filename.dat');
# calculate digest from filehandle
$keccak256_raw  = keccak256_file(*FILEHANDLE);
$keccak256_hex  = keccak256_file_hex(*FILEHANDLE);
$keccak256_b64  = keccak256_file_b64(*FILEHANDLE);
$keccak256_b64u = keccak256_file_b64u(*FILEHANDLE);
### OO interface:
use Crypt::Digest::Keccak256;
$d = Crypt::Digest::Keccak256->new;
$d->add('any data');
$d->addfile('filename.dat');
$d->addfile(*FILEHANDLE);
$result_raw  = $d->digest;     # raw bytes
$result_hex  = $d->hexdigest;  # hexadecimal form
$result_b64  = $d->b64digest;  # Base64 form
$result_b64u = $d->b64udigest; # Base64 URL Safe form

DESCRIPTION

Provides an interface to the Keccak256 digest algorithm.

EXPORT

Nothing is exported by default.

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

Logically joins all arguments into a single string, and returns its Keccak256 digest encoded as a binary string.

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

keccak256_hex

Logically joins all arguments into a single string, and returns its Keccak256 digest encoded as a hexadecimal string.

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

keccak256_b64

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

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

keccak256_b64u

Logically joins all arguments into a single string, and returns its Keccak256 digest encoded as a Base64 URL Safe string (see RFC 4648 section 5).

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

keccak256_file

Reads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded as a binary string.

$keccak256_raw = keccak256_file('filename.dat');
#or
$keccak256_raw = keccak256_file(*FILEHANDLE);

keccak256_file_hex

Reads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded as a hexadecimal string.

$keccak256_hex = keccak256_file_hex('filename.dat');
#or
$keccak256_hex = keccak256_file_hex(*FILEHANDLE);

BEWARE: You have to make sure that the filehandle is in binary mode before you pass it as argument to the addfile() method.

keccak256_file_b64

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

$keccak256_b64 = keccak256_file_b64('filename.dat');
#or
$keccak256_b64 = keccak256_file_b64(*FILEHANDLE);

keccak256_file_b64u

Reads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded as a Base64 URL Safe string (see RFC 4648 section 5).

$keccak256_b64url = keccak256_file_b64u('filename.dat');
#or
$keccak256_b64url = keccak256_file_b64u(*FILEHANDLE);

METHODS

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

new

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

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);

add_bits

$d->add_bits($bit_string);   # e.g. $d->add_bits("111100001010");
#or
$d->add_bits($data, $nbits); # e.g. $d->add_bits("\xF0\xA0", 16);

hashsize

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

digest

$result_raw = $d->digest();

hexdigest

$result_hex = $d->hexdigest();

b64digest

$result_b64 = $d->b64digest();

b64udigest

$result_b64url = $d->b64udigest();