=pod =head1 NAME SSL_CTX_use_serverinfo_ex, SSL_CTX_use_serverinfo, SSL_CTX_use_serverinfo_file - use serverinfo extension =head1 SYNOPSIS #include int SSL_CTX_use_serverinfo_ex(SSL_CTX *ctx, unsigned int version, const unsigned char *serverinfo, size_t serverinfo_length); int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo, size_t serverinfo_length); int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file); =head1 DESCRIPTION These functions load "serverinfo" TLS extensions into the SSL_CTX. A "serverinfo" extension is returned in response to an empty ClientHello Extension. SSL_CTX_use_serverinfo_ex() loads one or more serverinfo extensions from a byte array into B. The B parameter specifies the format of the byte array provided in B<*serverinfo> which is of length B. If B is B then the extensions in the array must consist of a 4-byte context, a 2-byte Extension Type, a 2-byte length, and then length bytes of extension_data. The context and type values have the same meaning as for L. If serverinfo is being loaded for extensions to be added to a Certificate message, then the extension will only be added for the first certificate in the message (which is always the end-entity certificate). If B is B then the extensions in the array must consist of a 2-byte Extension Type, a 2-byte length, and then length bytes of extension_data. The type value has the same meaning as for L. The following default context value will be used in this case: SSL_EXT_TLS1_2_AND_BELOW_ONLY | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_IGNORE_ON_RESUMPTION SSL_CTX_use_serverinfo() does the same thing as SSL_CTX_use_serverinfo_ex() except that there is no B parameter so a default version of SSL_SERVERINFOV1 is used instead. SSL_CTX_use_serverinfo_file() loads one or more serverinfo extensions from B into B. The extensions must be in PEM format. Each extension must be in a format as described above for SSL_CTX_use_serverinfo_ex(). Each PEM extension name must begin with the phrase "BEGIN SERVERINFOV2 FOR " for SSL_SERVERINFOV2 data or "BEGIN SERVERINFO FOR " for SSL_SERVERINFOV1 data. If more than one certificate (RSA/DSA) is installed using SSL_CTX_use_certificate(), the serverinfo extension will be loaded into the last certificate installed. If e.g. the last item was a RSA certificate, the loaded serverinfo extension data will be loaded for that certificate. To use the serverinfo extension for multiple certificates, SSL_CTX_use_serverinfo() needs to be called multiple times, once B each time a certificate is loaded via a call to SSL_CTX_use_certificate(). =head1 RETURN VALUES On success, the functions return 1. On failure, the functions return 0. Check out the error stack to find out the reason. =head1 COPYRIGHT Copyright 2013-2017 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 L. =cut