Bruno Haible <br...@clisp.org> writes: > Hello Nikos, > >> > Can you tell me >> > one program which spends more than 20% of its runtime in memxor? >> >> I had 10% speed-ups in a web server that used gnutls with the optimized >> version of memxor. That is because CBC encryption mode uses XOR heavily. >> 10% is enormous speed-up considering that this is a very small part of >> the encryption process. > > OK, that is sufficient rationale for having this faster memxor function in > gnutls. > > The next question, also to Simon, is whether you want to have the faster > memxor only in gnutls and leave the slower but simpler one in gnulib > (used by the modules crypto/*hmac-* only). Or whether you want to have the > faster one in gnulib.
I'm surprised the gnulib memxor ends up being used by GnuTLS at all. Nikos, shouldn't the Nettle implementation be used instead? Is this a question of the GnuTLS (gnulib) memxor symbol replacing the memxor that is shipped with Nettle? Maybe the solution is to fix the Nettle namespace. /Simon
