SSL_CTX_set_stateless_cookie_generate_cb(3)
NAME
SSL_CTX_set_stateless_cookie_generate_cb,
SSL_CTX_set_stateless_cookie_verify_cb - Callback functions for
stateless TLS1.3 cookies
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>.
1.1.1d SSL_CTX_set_stateless_cookie_generate_cb(3)
openssl 1.1.1d - Generated Mon Oct 14 19:19:08 CDT 2019