From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <04eb01c42665$becced30$0fca7d50@SOMA>
From: "boyd, rounin" <boyd@insultant.net>
To: <9fans@cse.psu.edu>
References: <31c092fb1a6b81a657845f36752eacba@juice.thebigchoice.com>
Subject: Re: [9fans] Microsoft Visual C++ Toolkit 2003
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Date: Tue, 20 Apr 2004 01:26:27 +0200
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> there are some other minor errors too
>
> such as auth.c(104) : warning C4013: 'des56to64' undefined; assuming
extern returning int

my theory is that you need the inverse of this:

-/*
- *	Convert a Plan 9 key to a DES key.
- */
-uchar	*
-des9key(uchar *key)
-{
-	int		i;
-	int		m1[]	= { 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F };
-	int		m2[]	= { 0x00, 0xFC, 0xF8, 0xF0, 0xE0, 0xC0, 0x80 };
-	static uchar	nkey[DESKEYPLEN];
-
-	nkey[0] = key[0] & 0xFE;
-
-	for (i = 1; i < 7; i++)
-		nkey[i] = (key[i - 1] & m1[i]) << 8 - i | (key[i] & m2[i]) >> i;
-
-	nkey[7] = (key[6] & 0x7F) << 1;
-
-
-	return nkey;
-}

as Plan 9 packs a DES key into 7 bytes, the 8th bit being a 'parity' bit and
unused.