X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fhmac-md5.c;h=d4e807ef0d625fbdc29e512edfdf7134e85f7792;hb=35dda7458879acb367f2cba0aaf7856cd98f5b63;hp=6df653d276ac2465084c89a304e420888e67f6ec;hpb=f6800ee02280d07036209444b32109c54c98ff64;p=gnulib.git

diff --git a/lib/hmac-md5.c b/lib/hmac-md5.c
index 6df653d27..d4e807ef0 100644
--- a/lib/hmac-md5.c
+++ b/lib/hmac-md5.c
@@ -1,5 +1,5 @@
 /* hmac-md5.c -- hashed message authentication codes
-   Copyright (C) 2005 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -17,12 +17,11 @@
 
 /* Written by Simon Josefsson.  */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 #include "hmac.h"
 
+#include "memxor.h"
 #include "md5.h"
 
 #include <string.h>
@@ -40,6 +39,8 @@ hmac_md5 (const void *key, size_t keylen,
   char block[64];
   char innerhash[16];
 
+  /* Reduce the key's size, so that it becomes <= 64 bytes large.  */
+
   if (keylen > 64)
     {
       struct md5_ctx keyhash;
@@ -52,6 +53,8 @@ hmac_md5 (const void *key, size_t keylen,
       keylen = 16;
     }
 
+  /* Compute INNERHASH from KEY and IN.  */
+
   md5_init_ctx (&inner);
 
   memset (block, IPAD, sizeof (block));
@@ -62,6 +65,8 @@ hmac_md5 (const void *key, size_t keylen,
 
   md5_finish_ctx (&inner, innerhash);
 
+  /* Compute result from KEY and INNERHASH.  */
+
   md5_init_ctx (&outer);
 
   memset (block, OPAD, sizeof (block));