meillo@0: void hmac_md5(unsigned char *text, int text_len,
meillo@0: 	      unsigned char* key, int key_len, unsigned char *digest);
meillo@0:      /* text;     pointer to data stream */
meillo@0:      /* text_len; length of data stream */
meillo@0:      /* key;      pointer to authentication key */
meillo@0:      /* key_len;  length of authentication key */
meillo@0:      /* digest;   caller digest to be filled in */