svn commit: r186189 - head/sys/netgraph

[Alexander Motin]

Author: mav
Date: Tue Dec 16 19:15:31 2008
New Revision: 186189
URL: http://svn.freebsd.org/changeset/base/186189

Log:
  Unroll two loops of SHA1Update(). 60 bytes of static memory is not a price.

Modified:
  head/sys/netgraph/ng_mppc.c

Modified: head/sys/netgraph/ng_mppc.c
==============================================================================
--- head/sys/netgraph/ng_mppc.c	Tue Dec 16 17:04:52 2008	(r186188)
+++ head/sys/netgraph/ng_mppc.c	Tue Dec 16 19:15:31 2008	(r186189)
@@ -824,21 +824,24 @@ ng_mppc_reset_req(node_p node)
 static void
 ng_mppc_getkey(const u_char *h, u_char *h2, int len)
 {
-	static const u_char pad1[10] =
-	    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, };
-	static const u_char pad2[10] =
-	    { 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, };
+	static const u_char pad1[40] =
+	    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	static const u_char pad2[40] =
+	    { 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+	      0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+	      0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+	      0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2 };
 	u_char hash[20];
 	SHA1_CTX c;
-	int k;
 
 	SHA1Init(&c);
 	SHA1Update(&c, h, len);
-	for (k = 0; k < 4; k++)
-		SHA1Update(&c, pad1, sizeof(pad1));
+	SHA1Update(&c, pad1, sizeof(pad1));
 	SHA1Update(&c, h2, len);
-	for (k = 0; k < 4; k++)
-		SHA1Update(&c, pad2, sizeof(pad2));
+	SHA1Update(&c, pad2, sizeof(pad2));
 	SHA1Final(hash, &c);
 	bcopy(hash, h2, len);
 }