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.

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

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

mysql_get_ssl_cipher(3)
Version 3.3.1