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Title "SSL_CTX_USE_SERVERINFO 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_CTX_use_serverinfo_ex, SSL_CTX_use_serverinfo, SSL_CTX_use_serverinfo_file \- use serverinfo extension Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& 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); .Ve Header "DESCRIPTION" These functions load \*(L"serverinfo\*(R" \s-1TLS\s0 extensions into the \s-1SSL_CTX. A\s0 \*(L"serverinfo\*(R" extension is returned in response to an empty ClientHello Extension.

\fBSSL_CTX_use_serverinfo_ex() loads one or more serverinfo extensions from a byte array into ctx. The version parameter specifies the format of the byte array provided in *serverinfo which is of length serverinfo_length.

If version is \s-1SSL_SERVERINFOV2\s0 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 SSL_CTX_add_custom_ext\|(3). 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 version is \s-1SSL_SERVERINFOV1\s0 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 \fBSSL_CTX_add_custom_ext\|(3). The following default context value will be used in this case:

.Vb 2 SSL_EXT_TLS1_2_AND_BELOW_ONLY | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_IGNORE_ON_RESUMPTION .Ve

\fBSSL_CTX_use_serverinfo() does the same thing as SSL_CTX_use_serverinfo_ex() except that there is no version parameter so a default version of \s-1SSL_SERVERINFOV1\s0 is used instead.

\fBSSL_CTX_use_serverinfo_file() loads one or more serverinfo extensions from \fBfile into ctx. The extensions must be in \s-1PEM\s0 format. Each extension must be in a format as described above for SSL_CTX_use_serverinfo_ex(). Each \s-1PEM\s0 extension name must begin with the phrase \*(L"\s-1BEGIN SERVERINFOV2 FOR \*(R"\s0 for \s-1SSL_SERVERINFOV2\s0 data or \*(L"\s-1BEGIN SERVERINFO FOR \*(R"\s0 for \s-1SSL_SERVERINFOV1\s0 data.

If more than one certificate (\s-1RSA/DSA\s0) is installed using \fBSSL_CTX_use_certificate(), the serverinfo extension will be loaded into the last certificate installed. If e.g. the last item was an \s-1RSA\s0 certificate, the loaded serverinfo extension data will be loaded for that certificate. To use the serverinfo extension for multiple certificates, \fBSSL_CTX_use_serverinfo() needs to be called multiple times, once after each time a certificate is loaded via a call to SSL_CTX_use_certificate().

Header "RETURN VALUES" On success, the functions return 1. On failure, the functions return 0. Check out the error stack to find out the reason. Header "SEE ALSO" \fBssl\|(7) Header "COPYRIGHT" Copyright 2013-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.