page_evp(3)

NAME
page_evpEVP - generic crypto interface
 - See the library functions here: EVP generic crypto functions

EVP Cipher

The use of EVP_CipherInit_ex() and EVP_Cipher() is pretty easy to understand forward, then EVP_CipherUpdate() and EVP_CipherFinal_ex() really needs an example to explain example_evp_cipher.c .