These are updates/fixes to DH/DSA/RAND docs based on the fixes to the RSA
[openssl.git] / doc / crypto / evp.pod
1 =pod
2
3 =head1 NAME
4
5 evp - high-level cryptographic functions
6
7 =head1 SYNOPSIS
8
9  #include <openssl/evp.h>
10
11 =head1 DESCRIPTION
12
13 The EVP library provides a high-level interface to cryptographic
14 functions.
15
16 B<EVP_Seal>I<...> and B<EVP_Open>I<...> provide public key encryption
17 and decryption to implement digital "envelopes".
18
19 The B<EVP_Sign>I<...> and B<EVP_Verify>I<...> functions implement
20 digital signatures.
21
22 Symmetric encryption is available with the B<EVP_Encrypt>I<...>
23 functions.  The B<EVP_Digest>I<...> functions provide message digests.
24
25 Algorithms are loaded with OpenSSL_add_all_algorithms(3).
26
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)
32 man page.
33
34 =head1 SEE ALSO
35
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)>
44
45 =cut