void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
unsigned int (*psk_client_callback)(SSL *ssl, const char *hint,
char *identity, unsigned int max_identity_len, unsigned char *psk,
void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
unsigned int (*psk_client_callback)(SSL *ssl, const char *hint,
char *identity, unsigned int max_identity_len, unsigned char *psk,