5 evp - high-level cryptographic functions
9 #include <openssl/evp.h>
13 The EVP library provides a high-level interface to cryptographic
16 B<EVP_Seal>I<...> and B<EVP_Open>I<...> provide public key encryption
17 and decryption to implement digital "envelopes".
19 The B<EVP_Sign>I<...> and B<EVP_Verify>I<...> functions implement
22 Symmetric encryption is available with the B<EVP_Encrypt>I<...>
23 functions. The B<EVP_Digest>I<...> functions provide message digests.
25 Algorithms are loaded with OpenSSL_add_all_algorithms(3).
27 All the symmetric algorithms (ciphers) and digests can be replaced by ENGINE
28 modules providing alternative implementations. If ENGINE implementations of
29 ciphers or digests are registered as defaults, then the various EVP functions
30 will automatically use those implementations automatically in preference to
31 built in software implementations. For more information, consult the engine(3)
36 L<EVP_DigestInit(3)|EVP_DigestInit(3)>,
37 L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>,
38 L<EVP_OpenInit(3)|EVP_OpenInit(3)>,
39 L<EVP_SealInit(3)|EVP_SealInit(3)>,
40 L<EVP_SignInit(3)|EVP_SignInit(3)>,
41 L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>,
42 L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>,
43 L<engine(3)|engine(3)>