- added ability to append data

2005-11-22 12:00:46 +00:00
parent a70d953d58
commit 1318dd4e36
2 changed files with 55 additions and 16 deletions
@@ -37,6 +37,11 @@ struct hmac_s {
 	/**
 	 * @brief Generate message authentication code.
 	 * 
+	 * If buffer is NULL, no result is given back. A next call will
+	 * append the data to already supplied. If buffer is not NULL, 
+	 * the mac of all apended data is calculated, returned and the
+	 * state of the hmac_t reset;
+	 * 
 	 * @param this			calling hmac
 	 * @param data			chunk of data to authenticate
 	 * @param [out]buffer	pointer where the generated bytes will be written
@@ -49,6 +54,11 @@ struct hmac_s {
 	 * @brief Generates message authentication code and 
 	 * allocate space for them.
 	 * 
+	 * If chunk is NULL, no result is given back. A next call will
+	 * append the data to already supplied. If chunk is not NULL, 
+	 * the mac of all apended data is calculated, returned and the
+	 * state of the hmac_t reset;
+	 * 
 	 * @param this			calling hmac
 	 * @param data			chunk of data to authenticate
 	 * @param [out]chunk	chunk which will hold generated bytes