SSL_CTX_set_stateless_cookie_generate_cb, SSL_CTX_set_stateless_cookie_verify_cb - Callback functions for stateless TLS1.3 cookies
#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));
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.
Neither function returns a value.
SSL_stateless(3)
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.