X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fhmac-md5.c;h=816762b7982c229b2a39d73e728e14d62415159b;hb=718b0598a7e9f5e9bdf3efc7e91e69a78e465327;hp=ecd071496049b0e23d75b83712aa80cf00ac92c9;hpb=11ad180881e62f7d8758936af419c2cc88e9cf79;p=gnulib.git

diff --git a/lib/hmac-md5.c b/lib/hmac-md5.c
index ecd071496..816762b79 100644
--- a/lib/hmac-md5.c
+++ b/lib/hmac-md5.c
@@ -41,6 +41,8 @@ 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;
@@ -53,6 +55,8 @@ 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));
@@ -63,6 +67,8 @@ 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));