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The latest Openssl package for Openwrt is for Openssl 1.0.2h, as you can see here: github.com/openwrt-mirror/openwrt/tree/master/package/libs/openssl
OpenSSL 1.1.0 has a lot of changes compared to OpenSSL 1.0.2, so it isn't possible to just make a few changes to the Makefile in order to compile OpenSSL 1.1.0 for OpenWrt.
How can I cross-compile OpenSSL 1.1.0f for an OpenWRT router?
It's fairly easy to compile openssl-1.1.0. However, 1.1.0 contains significant changes to the openssl API which breaks many, many packages that are dependent on openssl. I compiled it last year when it was first released but the API changes made it impossible to use without patching many packages.
If you want, I can post the Makefile I used to compile 1.1.0 for 15.05, but I recommend you don't even try.
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