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=head1 NAME

crypto - OpenSSL cryptographic library

=head1 SYNOPSIS

See the individual manual pages for details.

=head1 DESCRIPTION

The OpenSSL B<crypto> library implements a wide range of cryptographic

algorithms used in various Internet standards. The services provided

by this library are used by the OpenSSL implementations of SSL, TLS

and S/MIME, and they have also been used to implement SSH, OpenPGP, and

other cryptographic standards.

B<libcrypto> consists of a number of sub-libraries that implement the

individual algorithms.

The functionality includes symmetric encryption, public key

cryptography and key agreement, certificate handling, cryptographic

hash functions, cryptographic pseudo-random number generator, and

various utilities.

=head1 NOTES

Some of the newer functions follow a naming convention using the numbers

B<0> and B<1>. For example the functions:

 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);

 int X509_add1_trust_object(X509 *x, const ASN1_OBJECT *obj);

The B<0> version uses the supplied structure pointer directly

in the parent and it will be freed up when the parent is freed.

In the above example B<crl> would be freed but B<rev> would not.

The B<1> function uses a copy of the supplied structure pointer

(or in some cases increases its link count) in the parent and

so both (B<x> and B<obj> above) should be freed up.

=head1 RETURN VALUES

See the individual manual pages for details.

=head1 SEE ALSO

L<openssl(1)>, L<ssl(7)>

=head1 COPYRIGHT

Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use

this file except in compliance with the License.  You can obtain a copy

in the file LICENSE in the source distribution or at

L<https://www.openssl.org/source/license.html>.

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