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SSL_CTX_set_stateless_cookie_generate_cb(3)                            OpenSSL



NAME
       SSL_CTX_set_stateless_cookie_generate_cb,
       SSL_CTX_set_stateless_cookie_verify_cb - Callback functions for
       stateless TLS1.3 cookies

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/ssl.h>

        void SSL_CTX_set_stateless_cookie_generate_cb(
            SSL_CTX *ctx,
            int (*gen_stateless_cookie_cb) (SSL *ssl,
                                            unsigned char *cookie,
                                            size_t *cookie_len));
        void SSL_CTX_set_stateless_cookie_verify_cb(
            SSL_CTX *ctx,
            int (*verify_stateless_cookie_cb) (SSL *ssl,
                                               const unsigned char *cookie,
                                               size_t cookie_len));

DESCRIPTION
       SSL_CTX_set_cookie_generate_cb() sets the callback used by
       SSL_stateless(3) to generate the application-controlled portion of the
       cookie provided to clients in the HelloRetryRequest transmitted as a
       response to a ClientHello with a missing or invalid cookie.
       gen_stateless_cookie_cb() must write at most SSL_COOKIE_LENGTH bytes
       into cookie, and must write the number of bytes written to cookie_len.
       If a cookie cannot be generated, a zero return value can be used to
       abort the handshake.

       SSL_CTX_set_cookie_verify_cb() sets the callback used by
       SSL_stateless(3) to determine whether the application-controlled
       portion of a ClientHello cookie is valid. A nonzero return value from
       app_verify_cookie_cb() communicates that the cookie is valid. The
       integrity of the entire cookie, including the application-controlled
       portion, is automatically verified by HMAC before
       verify_stateless_cookie_cb() is called.

RETURN VALUES
       Neither function returns a value.

SEE ALSO
       SSL_stateless(3)

COPYRIGHT
       Copyright 2018 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
       <https://www.openssl.org/source/license.html>.



1.1.1                             2018-09-17
                                   SSL_CTX_set_stateless_cookie_generate_cb(3)