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();

SEE ALSO

       •   Crypt::Stream::RC4, Crypt::Stream::Sober128, Crypt::Stream::Salsa20,
           Crypt::Stream::Sosemanuk

       •   <https://tools.ietf.org/html/rfc7539>