1=pod
2
3=head1 NAME
4
5evp - high-level cryptographic functions
6
7=head1 SYNOPSIS
8
9 #include <openssl/evp.h>
10
11=head1 DESCRIPTION
12
13The EVP library provides a high-level interface to cryptographic
14functions.
15
16B<EVP_Seal>I<...> and B<EVP_Open>I<...> provide public key encryption
17and decryption to implement digital "envelopes".
18
19The B<EVP_Sign>I<...> and B<EVP_Verify>I<...> functions implement
20digital signatures.
21
22Symmetric encryption is available with the B<EVP_Encrypt>I<...>
23functions.  The B<EVP_Digest>I<...> functions provide message digests.
24
25Algorithms are loaded with OpenSSL_add_all_algorithms(3).
26
27All the symmetric algorithms (ciphers) and digests can be replaced by ENGINE
28modules providing alternative implementations. If ENGINE implementations of
29ciphers or digests are registered as defaults, then the various EVP functions
30will automatically use those implementations automatically in preference to
31built in software implementations. For more information, consult the engine(3)
32man page.
33
34=head1 SEE ALSO
35
36L<EVP_DigestInit(3)|EVP_DigestInit(3)>,
37L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>,
38L<EVP_OpenInit(3)|EVP_OpenInit(3)>,
39L<EVP_SealInit(3)|EVP_SealInit(3)>,
40L<EVP_SignInit(3)|EVP_SignInit(3)>,
41L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>,
42L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>,
43L<engine(3)|engine(3)>
44
45=cut
46