NAME

Crypt::Stream::ChaCha - Stream cipher ChaCha

SYNOPSIS

use Crypt::Stream::ChaCha;
# encrypt
$key = "1234567890123456";
$iv  = "123456789012";
$stream = Crypt::Stream::ChaCha->new($key, $iv);
$ct = $stream->crypt("plain message");
# decrypt
$key = "1234567890123456";
$iv  = "123456789012";
$stream = Crypt::Stream::ChaCha->new($key, $iv);
$pt = $stream->crypt($ct);

DESCRIPTION

Provides an interface to the ChaCha stream cipher.

METHODS

new

$stream = Crypt::Stream::ChaCha->new($key, $iv);
#or
$stream = Crypt::Stream::ChaCha->new($key, $iv, $counter, $rounds);
# $key     .. 32 or 16 bytes
# $iv      .. 8 or 12 bytes
# $counter .. initial counter value (DEFAULT: 0)
# $rounds  .. rounds (DEFAULT: 20)

crypt

$ciphertext = $stream->crypt($plaintext);
#or
$plaintext = $stream->crypt($ciphertext);

keystream

$random_key = $stream->keystream($length);

clone

$stream->clone();