Add AES-GCM encryption example
-rw-r--r-- 758 crypt.c
-rw-r--r-- 7146 crypt.h
-rw-r--r-- 191 crypto_final.h
drwxr-xr-x - doc
-rw-r--r-- 1522 evp-key-gen.c
drwxr-xr-x - examples
drwxr-xr-x - src
drwxr-xr-x - test