1 .\" $OpenBSD: crypto.3,v 1.18 2018/02/27 20:43:41 schwarze Exp $
2 .\" OpenSSL a9c85cea Nov 11 09:33:55 2016 +0100
4 .\" This file was written by Ulf Moeller <ulf@openssl.org> and
5 .\" Dr. Stephen Henson <steve@openssl.org>.
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52 .Dd $Mdocdate: February 27 2018 $
57 .Nd OpenSSL cryptographic library
59 The OpenSSL crypto library implements a wide range of cryptographic
60 algorithms used in various Internet standards.
61 The services provided by this library are used by the OpenSSL
62 implementations of TLS and S/MIME, and they have also been used to
63 implement SSH, OpenPGP, and other cryptographic standards.
66 including AES, Blowfish, CAST, Chacha20, IDEA, DES, RC2, and RC4
67 are provided by the generic interface
68 .Xr EVP_EncryptInit 3 .
69 Low-level stand-alone interfaces include
75 .Sy Public key cryptography and key agreement
87 .Xr X509v3_add_ext 3 .
89 .Sy Authentication codes and hash functions
99 .Sy Input, output, and data encoding
100 facilities include ASN.1,
104 .Xr PKCS7_encrypt 3 ,
106 .Xr PKCS12_create 3 ,
108 .Xr SMIME_write_PKCS7 3 .
110 .Sy Auxiliary features include:
113 configuration file handling: see
120 .Xr CRYPTO_set_locking_callback 3
122 .Xr OCSP_REQUEST_new 3
125 .Sy Internal utilities
132 Some of the newer functions follow a naming convention using the numbers
136 For example consider the names of these functions:
139 .Fo X509_CRL_add0_revoked
141 .Fa "X509_REVOKED *rev"
145 .Fo X509_add1_trust_object
147 .Fa "ASN1_OBJECT *obj"
152 version uses the supplied structure pointer directly in the parent and
153 it will be freed up when the parent is freed.
162 function uses a copy of the supplied structure pointer (or in some cases
163 increases its link count) in the parent and so both
167 above) should be freed up.