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

 $stream = Crypt::Stream::ChaCha->new($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)

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

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

 $stream->clone();

SEE ALSO

• Crypt::Stream::RC4, Crypt::Stream::Sober128, Crypt::Stream::Salsa20, Crypt::Stream::Sosemanuk
• <https://tools.ietf.org/html/rfc7539>