SSL_get_psk_identity, SSL_get_psk_identity_hint - get PSK client identity
const char *SSL_get_psk_identity_hint(const SSL *ssl);
const char *SSL_get_psk_identity(const SSL *ssl);
SSL_get_psk_identity_hint() is used to retrieve the PSK
identity hint used during the connection setup related to SSL object
SSL_get_psk_identity() is used to retrieve the
PSK identity used during the connection setup.
SSL_get_psk_identity_hint() returns the PSK identity hint
SSL_get_psk_identity() returns the PSK identity. Both are
SSL_get_psk_identity_hint() may return NULL if no PSK identity hint was used during the connection setup.
Note that the return value is valid only during the lifetime of the SSL