3fa2812f32
These functions are similar to SSL_CTX_set_cookie_{generate,verify}_cb,
but used for the application-controlled portion of TLS1.3 stateless
handshake cookies rather than entire DTLSv1 cookies.
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5463)
58 lines
2 KiB
Text
58 lines
2 KiB
Text
=pod
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=head1 NAME
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SSL_CTX_set_stateless_cookie_generate_cb,
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SSL_CTX_set_stateless_cookie_verify_cb
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- Callback functions for stateless TLS1.3 cookies
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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void SSL_CTX_set_stateless_cookie_generate_cb(
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SSL_CTX *ctx,
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int (*gen_stateless_cookie_cb) (SSL *ssl,
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unsigned char *cookie,
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size_t *cookie_len));
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void SSL_CTX_set_stateless_cookie_verify_cb(
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SSL_CTX *ctx,
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int (*verify_stateless_cookie_cb) (SSL *ssl,
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const unsigned char *cookie,
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size_t cookie_len));
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=head1 DESCRIPTION
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SSL_CTX_set_cookie_generate_cb() sets the callback used by L<SSL_stateless(3)>
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to generate the application-controlled portion of the cookie provided to clients
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in the HelloRetryRequest transmitted as a response to a ClientHello with a
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missing or invalid cookie. gen_stateless_cookie_cb() must write at most
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SSL_COOKIE_LENGTH bytes into B<cookie>, and must write the number of bytes
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written to B<cookie_len>. If a cookie cannot be generated, a zero return value
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can be used to abort the handshake.
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SSL_CTX_set_cookie_verify_cb() sets the callback used by L<SSL_stateless(3)> to
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determine whether the application-controlled portion of a ClientHello cookie is
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valid. A nonzero return value from app_verify_cookie_cb() communicates that the
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cookie is valid. The integrity of the entire cookie, including the
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application-controlled portion, is automatically verified by HMAC before
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verify_stateless_cookie_cb() is called.
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=head1 RETURN VALUES
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Neither function returns a value.
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=head1 SEE ALSO
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L<SSL_stateless(3)>
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=head1 COPYRIGHT
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Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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