evp(3)
NAME
evp - high-level cryptographic functions
SYNOPSIS
#include <openssl/evp.h>
DESCRIPTION
The EVP library provides a high-level interface to cryptographic
functions.
EVP_Seal... and EVP_Open... provide public key encryption and
decryption to implement digital "envelopes".
The EVP_Sign... and EVP_Verify... functions implement digital
signatures.
Symmetric encryption is available with the EVP_Encrypt... functions. The EVP_Digest... functions provide message digests.
Algorithms are loaded with OpenSSL_add_all_algorithms(3).
All the symmetric algorithms (ciphers) and digests can be replaced by
ENGINE modules providing alternative implementations. If ENGINE
implementations of ciphers or digests are registered as defaults, then
the various EVP functions will automatically use those implementations
automatically in preference to built in software implementations. For
more information, consult the engine(3) man page.