Which encryption library do you people use with c/c++? I'm trying to use openssl but well there is more documentation about how to replace my own heart in the dark than on that. Also most of the structs have missing declarations hell yeah its nice to have a EVP_PKEY but what's that? Oh I know it's a evp_pkey_t and what's that? Nothing apparently. Comments? You kidding??? A proper library doesn't have them...

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Poco library has some convenient wrapper around Openssl. (Was a bit scared from their API - and their macro code style - but using it turned out not too bad.)
Libsodium could also be worth a look.

Currently using OpenSSL, it's the only library that I managed to *at least* get to work. Others couldn't even compile their own provided examples after following their guides to the letter.

The "best" documentation I've found is at:
openssl.org/docs/manpages.html
wiki.openssl.org
Plus the old 1.0.1c docs at docs.huihoo.com/doxygen/openssl/1.0.1c/annotated.html

I have to agree with you though, even OpenSSL is so damn inconsistent and undocumented