CRYPTO(7)                            OpenSSL                           CRYPTO(7)

       crypto - OpenSSL cryptographic library

       See the individual manual pages for details.

       The OpenSSL 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.

       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.

       Some of the newer functions follow a naming convention using the numbers
       0 and 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 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
       crl would be freed but rev would not.

       The 1 function uses a copy of the supplied structure pointer (or in some
       cases increases its link count) in the parent and so both (x and obj
       above) should be freed up.

       See the individual manual pages for details.

       openssl(1), ssl(7)

       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

1.1.1l                             2021-08-24                          CRYPTO(7)