MySQL 8.0 C API Developer Guide
void mysql_reset_server_public_key(void)
Clears from the client library any cached copy of the public
key required by the server for RSA key pair-based password
exchange. This might be necessary when the server has been
restarted with a different RSA key pair after the client
program had called
mysql_options() with the
MYSQL_SERVER_PUBLIC_KEY option to specify
the RSA public key. In such cases, connection failure can
occur due to key mismatch. To fix this problem, the client can
use either of the following approaches:
The client can call
mysql_reset_server_public_key()
to clear the cached key and try again, after the public
key file on the client side has been replaced with a file
containing the new public key.
The client can call
mysql_reset_server_public_key()
to clear the cached key, then call
mysql_options() with the
MYSQL_OPT_GET_SERVER_PUBLIC_KEY option
(instead of MYSQL_SERVER_PUBLIC_KEY) to
request the required public key from the server Do not use
both MYSQL_OPT_GET_SERVER_PUBLIC_KEY
and MYSQL_SERVER_PUBLIC_KEY because in
that case, MYSQL_SERVER_PUBLIC_KEY
takes precedence.