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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 | ||