1SSL_CTX_SET_STATELESS_COOKIE_GENERATSEOS_pLCe_BnC(ST3SX)L_SET_STATELESS_COOKIE_GENERATE_CB(3)
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NAME

6       SSL_CTX_set_stateless_cookie_generate_cb,
7       SSL_CTX_set_stateless_cookie_verify_cb - Callback functions for
8       stateless TLS1.3 cookies
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SYNOPSIS

11        #include <openssl/ssl.h>
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13        void SSL_CTX_set_stateless_cookie_generate_cb(
14            SSL_CTX *ctx,
15            int (*gen_stateless_cookie_cb) (SSL *ssl,
16                                            unsigned char *cookie,
17                                            size_t *cookie_len));
18        void SSL_CTX_set_stateless_cookie_verify_cb(
19            SSL_CTX *ctx,
20            int (*verify_stateless_cookie_cb) (SSL *ssl,
21                                               const unsigned char *cookie,
22                                               size_t cookie_len));
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DESCRIPTION

25       SSL_CTX_set_cookie_generate_cb() sets the callback used by
26       SSL_stateless(3) to generate the application-controlled portion of the
27       cookie provided to clients in the HelloRetryRequest transmitted as a
28       response to a ClientHello with a missing or invalid cookie.
29       gen_stateless_cookie_cb() must write at most SSL_COOKIE_LENGTH bytes
30       into cookie, and must write the number of bytes written to cookie_len.
31       If a cookie cannot be generated, a zero return value can be used to
32       abort the handshake.
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34       SSL_CTX_set_cookie_verify_cb() sets the callback used by
35       SSL_stateless(3) to determine whether the application-controlled
36       portion of a ClientHello cookie is valid. A nonzero return value from
37       app_verify_cookie_cb() communicates that the cookie is valid. The
38       integrity of the entire cookie, including the application-controlled
39       portion, is automatically verified by HMAC before
40       verify_stateless_cookie_cb() is called.
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RETURN VALUES

43       Neither function returns a value.
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SEE ALSO

46       SSL_stateless(3)
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49       Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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51       Licensed under the OpenSSL license (the "License").  You may not use
52       this file except in compliance with the License.  You can obtain a copy
53       in the file LICENSE in the source distribution or at
54       <https://www.openssl.org/source/license.html>.
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581.1.1                             20S1S8L-_0C9T-X1_1SET_STATELESS_COOKIE_GENERATE_CB(3)
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