made default mode sensible Until now in case no mode was specified, a message would have been read from stdin but then it would fail because no recipients had been given on the cmd line. (This had been useful only if -t was given.) Now in case of no mode being specified neither address arguments or -t is given then the version message is printed, otherwise mode accept is entered (as until yet).

void hmac_md5(
	unsigned char* text,   /* pointer to the message */
	int textlen,           /* length of the message */
	unsigned char* key,    /* pointer to the authentication key */
	int keylen,            /* length of the key */
	unsigned char* digest  /* pointer to allocated memory to store the computed HMAC */
);