mysql_ssl_set(3) MariaDB Connector/C mysql_ssl_set(3)

mysql_ssl_set - Sets TLS/SSL options

#include <mysql.h>
my_bool mysql_ssl_set(MYSQL *mysql,
                      const char *key,
                      const char *cert,
                      const char *ca,
                      const char *capath,
                      const char *cipher)

Used for establishing a secure TLS connection. It must be called before attempting to use mysql_real_connect(3). TLS support must be enabled in the client library in order for the function to have any effect.

NULL can be used for an unused parameter. Always returns zero.

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mysql - a mysql handle, which was previously allocated by mysql_init(3).
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key - path to the key file.
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cert - path to the certificate file.
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ca - path to the certificate authority file.
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capath - path to the directory containing the trusted TLS CA certificates in PEM format.
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cipher list of permitted (SSLv3, TLSv1.0 or TLSv1.2) cipher suites to use for TLS encryption.

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mysql_real_connect(3) will return an error if attempting to connect and TLS is incorrectly set up.
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Even if Connector/C supports TLSv1.3 protocol, it is not possible yet to specify TLSv1.3 cipher suites via cipher parameter.

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mysql_get_ssl_cipher(3)
Version 3.3.1