Move key_ctx_bi into crypto_options

Move key_ctx_bi into crypto_options

The encrypt and decrypt routines use struct crypto_options as their main
information source.  A struct crypto_options would have a pointer to a
struct key_ctx_bi, which had to be updated at the correct moments to keep
them correct.  Instead of doing this administration, just put the struct
key_ctx_bi inside crypto_options.  Makes the code a little simpler too.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1454874438-5081-5-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/11078
Signed-off-by: Gert Doering <gert@greenie.muc.de>