Initial Commit

database/perl/vendor/lib/Crypt/Stream/ChaCha.pm

@@ -0,0 +1,74 @@
+package Crypt::Stream::ChaCha;
+
+use strict;
+use warnings;
+our $VERSION = '0.069';
+
+use CryptX;
+
+1;
+
+=pod
+
+=head1 NAME
+
+Crypt::Stream::ChaCha - Stream cipher ChaCha
+
+=head1 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);
+
+=head1 DESCRIPTION
+
+Provides an interface to the ChaCha stream cipher.
+
+=head1 METHODS
+
+=head2 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)
+
+=head2 crypt
+
+ $ciphertext = $stream->crypt($plaintext);
+ #or
+ $plaintext = $stream->crypt($ciphertext);
+
+=head2 keystream
+
+ $random_key = $stream->keystream($length);
+
+=head2 clone
+
+ $stream->clone();
+
+=head1 SEE ALSO
+
+=over
+
+=item * L<Crypt::Stream::RC4>, L<Crypt::Stream::Sober128>, L<Crypt::Stream::Salsa20>, L<Crypt::Stream::Sosemanuk>
+
+=item * L<https://tools.ietf.org/html/rfc7539>
+
+=back
+
+=cut