ChaCha20 Rekey Frequency

[Thorsten Glaser]

Hi Damien,

>This is what I'm playing with at the moment:

if you’re playing with this currently anyway, shouldn’t…

>+	/*
>+	 * Otherwise, use the RFC4344 s3.2 recommendation of 2**(L/4) blocks
>+	 * before rekeying where L is the blocksize in bits.
>+	 * Most other ciphers have a 128 bit blocksize, so this equates to
>+	 * 2**32 blocks / 64GB data.
>+	 */
>+	return (uint64_t)1 << (c->block_size * 2);

… this get an upper bound? This is UB for 256-bit blocksizes
at least…

bye,
//mirabilos
-- 
Infrastrukturexperte • tarent solutions GmbH
Am Dickobskreuz 10, D-53121 Bonn • http://www.tarent.de/
Telephon +49 228 54881-393 • Fax: +49 228 54881-235
HRB AG Bonn 5168 • USt-ID (VAT): DE122264941
Geschäftsführer: Dr. Stefan Barth, Kai Ebenrett, Boris Esser, Alexander Steeg

                        ****************************************************
/⁀\ The UTF-8 Ribbon
╲ ╱ Campaign against      Mit dem tarent-Newsletter nichts mehr verpassen:
 ╳  HTML eMail! Also,     https://www.tarent.de/newsletter
╱ ╲ header encryption!
                        ****************************************************