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replace custom randfill() with prng() calls, remove rand()/nrand() definitions from kernel

--- a/include/x.c

+++ /dev/null

@@ -1,6 +1,0 @@

-#include <stdio.h>

-

-void

-main(void)

-{

-}

--- a/kern/devcons.c

+++ b/kern/devcons.c

@@ -1020,30 +1020,3 @@

 	return n;

 }

-

-static	ulong	randn;

-

-static void

-seedrand(void)

-{

-	if(!waserror()){

-		randomread((void*)&randn, sizeof(randn));

-		poperror();

-	}

-}

-

-int

-nrand(int n)

-{

-	if(randn == 0)

-		seedrand();

-	randn = randn*1103515245 + 12345;

-	return (randn>>16) % n;

-}

-

-int

-rand(void)

-{

-	nrand(1);

-	return randn;

-}

--- a/kern/devssl.c

+++ b/kern/devssl.c

@@ -681,17 +681,6 @@

 	return n;

 }

-/*

- *  this algorithm doesn't have to be great since we're just

- *  trying to obscure the block fill

- */

-static void

-randfill(uchar *buf, int len)

-{

-	while(len-- > 0)

-		*buf++ = nrand(256);

-}

-

 static long

 sslbwrite(Chan *c, Block *b, ulong o)

 {

@@ -781,7 +770,7 @@

 		/* SSL style count */

 		if(pad){

 			nb = padblock(nb, -pad);

-			randfill(nb->wp, pad);

+			prng(nb->wp, pad);

 			nb->wp += pad;

 			m += pad;

--- a/kern/devtls.c

+++ b/kern/devtls.c

@@ -1231,13 +1231,6 @@

 	return n;

 }

-static void

-randfill(uchar *buf, int len)

-{

-	while(len-- > 0)

-		*buf++ = nrand(256);

-}

-

 /*

  *  write a block in tls records

  */

@@ -1322,7 +1315,7 @@

 				n = (*sec->aead_enc)(sec, aad, aadlen, p + RecHdrLen, p + RecHdrLen + ivlen, n) + ivlen;

 			else {

 				if(ivlen > 0)

-					randfill(p + RecHdrLen, ivlen);

+					prng(p + RecHdrLen, ivlen);

 				packMac(sec, aad, aadlen, p + RecHdrLen + ivlen, n, p + RecHdrLen + ivlen + n);

 				n = (*sec->enc)(sec, p + RecHdrLen, ivlen + n + maclen);

 			}

@@ -1520,7 +1513,7 @@

 	s->maclen = 16;

 	s->recivlen = 8;

 	memmove(s->mackey, iv, ea->ivlen);

-	randfill(s->mackey + ea->ivlen, s->recivlen);

+	prng(s->mackey + ea->ivlen, s->recivlen);

 	setupAESGCMstate(s->enckey, p, ea->keylen, nil, 0);

 }

--- a/kern/fns.h

+++ b/kern/fns.h

@@ -190,7 +190,6 @@

 void		nexterror(void);

 Cname*		newcname(char*);

 int		notify(Ureg*);

-int		nrand(int);

 int		okaddr(ulong, ulong, int);

 int		openmode(ulong);

 void		oserrstr(void);

@@ -271,7 +270,6 @@

 int		qwindow(Queue*);

 int		qwrite(Queue*, void*, int);

 void		qnoblock(Queue*, int);

-int		rand(void);

 void		randominit(void);

 ulong		randomread(void*, ulong);

 void		rdb(void);