[Pkg-openssl-devel] Bug#698447:

[Adam Langley]

Bodo Moeller (from the OpenSSL core team, bodo AT openssl DOT org) has
this to say when I asked him about this:

 "The main (or maybe only) reason this is not enabled automatically is
that the OpenSSL configure script is not clever enough to detect
whether the compiler supports __uint128_t. If you can use this code,
it is superior to the default in multiple regards (speed, and also
security as the new implementations are secure against timing
attacks)."