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SSL_CTX_SET_STATELESS_COOKIE_GENERATE_CB(3SSL) | OpenSSL | SSL_CTX_SET_STATELESS_COOKIE_GENERATE_CB(3SSL) |
NAME¶
SSL_CTX_set_stateless_cookie_generate_cb, SSL_CTX_set_stateless_cookie_verify_cb - Callback functions for stateless TLS1.3 cookiesSYNOPSIS¶
#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>.
2020-04-20 | 1.1.1d |