init_key_ctx: key and iv arguments can (now) be const

init_key_ctx: key and iv arguments can (now) be const

In older OpenSSL, the key and iv arguments of EVP_CipherInit_ex() were not
const, which meant that our API could not be const either.  Since we
dropped support for OpenSSL 0.9.8, we can now fix our internal API.

Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <1497873065-2229-1-git-send-email-steffan.karger@fox-it.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg14881.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>