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devfs-win32: use sha1() for pathhash

--- a/kern/devfs-win32.c

+++ b/kern/devfs-win32.c

@@ -9,6 +9,8 @@

 #include	"fns.h"

 #include	"error.h"

+#include	<libsec.h>	/* for sha1 in pathhash() */

+

 typedef struct DIR	DIR;

 typedef	struct Ufsinfo	Ufsinfo;

@@ -65,11 +67,11 @@

 static uvlong

 pathhash(TCHAR *p)

 {

-	uvlong h;

-	h = 0LL;

-	for(; *p; p++)

-		h += *p * 13;

-	return h;

+	uchar digest[SHA1dlen];

+	int n;

+	for(n=0; p[n] != 0; n++);

+	sha1((uchar*)p, n*sizeof(TCHAR), digest, nil);

+	return *(uvlong*)digest;

 }

 static ulong