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$NetBSD: patch-bu,v 1.1.1.1 1999/10/08 04:34:43 dbj Exp $
--- /dev/null Sat Sep 25 16:45:44 1999
+++ netbsd-1.4/getkey.c Sat Sep 25 17:06:23 1999
@@ -0,0 +1,51 @@
+/*
+ * Microsoft's Get_Key() per mppe draft by mag <mag@bunuel.tii.matav.hu>
+ */
+#include <sys/param.h>
+#include <sys/systm.h>
+#include "sha.h"
+
+ /*
+ * Pads used in key derivation
+ */
+static unsigned char SHAPad1[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 unsigned char SHAPad2[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};
+
+ /*
+ * SHAInit(), SHAUpdate() and SHAFinal() functions are an
+ * implementation of Secure Hash Algorithm (SHA-1) [7]. These are
+ * available in public domain or can be licensed from
+ * RSA Data Security, Inc.
+ *
+ * 1) H is 8 bytes long for 40 bit session keys.
+ * 2) H is 16 bytes long for 128 bit session keys.
+ * 3) H' is same as H when this routine is called for the first time
+ * for the session.
+ * 4) The generated key is returned in H'. This is the "current" key.
+ */
+void
+GetNewKeyFromSHA(StartKey, SessionKey, SessionKeyLength, InterimKey)
+ unsigned char *StartKey;
+ unsigned char *SessionKey;
+ unsigned long SessionKeyLength;
+ unsigned char *InterimKey;
+{
+ SHA_CTX Context;
+ unsigned char Digest[SHA_DIGEST_LENGTH];
+
+ SHA1_Init(&Context);
+ SHA1_Update(&Context, StartKey, SessionKeyLength);
+ SHA1_Update(&Context, SHAPad1, 40);
+ SHA1_Update(&Context, SessionKey, SessionKeyLength);
+ SHA1_Update(&Context, SHAPad2, 40);
+ SHA1_Final(Digest,&Context);
+ memcpy(InterimKey, Digest, SessionKeyLength);
+}
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