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auth/changeuser: set the aes key in plan9 database, but not in securenet db

--- a/sys/src/cmd/auth/changeuser.c

+++ b/sys/src/cmd/auth/changeuser.c

@@ -82,9 +82,11 @@

 			if(answer[0] != 'y' && answer[0] != 'Y')

 				newkey = 0;

 		}

-		if(newkey)

+		if(newkey){

+			memset(&key, 0, sizeof(key));

 			for(i=0; i<DESKEYLEN; i++)

 				key.des[i] = nrand(256);

+		}

 		if(a.user == 0){

 			t = getexpiration(f->keys, u);

 			newbio = querybio(f->who, u, &a);

@@ -117,11 +119,8 @@

 	}

 	if(newkey){

-		sprint(buf, "%s/%s/key", db, u);

-		fd = open(buf, OWRITE);

-		if(fd < 0 || write(fd, key->des, DESKEYLEN) != DESKEYLEN)

+		if(!setkey(db, u, key))

 			error("can't set key: %r");

-		close(fd);

 	}

 	if(t == -1)

-- 

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