1=pod 2 3=head1 NAME 4 5crypto - OpenSSL cryptographic library 6 7=head1 SYNOPSIS 8 9See the individual manual pages for details. 10 11=head1 DESCRIPTION 12 13The OpenSSL B<crypto> library implements a wide range of cryptographic 14algorithms used in various Internet standards. The services provided 15by this library are used by the OpenSSL implementations of SSL, TLS 16and S/MIME, and they have also been used to implement SSH, OpenPGP, and 17other cryptographic standards. 18 19B<libcrypto> consists of a number of sub-libraries that implement the 20individual algorithms. 21 22The functionality includes symmetric encryption, public key 23cryptography and key agreement, certificate handling, cryptographic 24hash functions, cryptographic pseudo-random number generator, and 25various utilities. 26 27=head1 NOTES 28 29Some of the newer functions follow a naming convention using the numbers 30B<0> and B<1>. For example the functions: 31 32 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev); 33 int X509_add1_trust_object(X509 *x, const ASN1_OBJECT *obj); 34 35The B<0> version uses the supplied structure pointer directly 36in the parent and it will be freed up when the parent is freed. 37In the above example B<crl> would be freed but B<rev> would not. 38 39The B<1> function uses a copy of the supplied structure pointer 40(or in some cases increases its link count) in the parent and 41so both (B<x> and B<obj> above) should be freed up. 42 43=head1 RETURN VALUES 44 45See the individual manual pages for details. 46 47=head1 SEE ALSO 48 49L<openssl(1)>, L<ssl(7)> 50 51=head1 COPYRIGHT 52 53Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 54 55Licensed under the OpenSSL license (the "License"). You may not use 56this file except in compliance with the License. You can obtain a copy 57in the file LICENSE in the source distribution or at 58L<https://www.openssl.org/source/license.html>. 59 60=cut 61