Changed sum_init() to take a seed value as an arg instead of always

using checksum_init.  This fixes an authentication problem in server
mode (as pointed out by Craig Barratt).

authenticate.c

@@ -65,7 +65,7 @@ static void gen_challenge(char *addr, char *challenge)
 	SIVAL(input, 20, tv.tv_usec);
 	SIVAL(input, 24, getpid());
 
-	sum_init();
+	sum_init(0);
 	sum_update(input, sizeof input);
 	sum_end(challenge);
 }
@@ -199,7 +199,7 @@ static void generate_hash(char *in, char *challenge, char *out)
 {
 	char buf[16];
 
-	sum_init();
+	sum_init(0);
 	sum_update(in, strlen(in));
 	sum_update(challenge, strlen(challenge));
 	sum_end(buf);

checksum.c

@@ -135,13 +135,13 @@ static int sumresidue;
 static char sumrbuf[CSUM_CHUNK];
 static struct mdfour md;
 
-void sum_init(void)
+void sum_init(int seed)
 {
 	char s[4];
 	mdfour_begin(&md);
-	sumresidue=0;
-	SIVAL(s,0,checksum_seed);
-	sum_update(s,4);
+	sumresidue = 0;
+	SIVAL(s, 0, seed);
+	sum_update(s, 4);
 }
 
 /**

match.c

@@ -22,6 +22,7 @@
 extern int verbose;
 extern int am_server;
 extern int do_progress;
+extern int checksum_seed;
 
 typedef unsigned short tag;
 
@@ -299,7 +300,7 @@ void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len)
 	matches = 0;
 	data_transfer = 0;
 
-	sum_init();
+	sum_init(checksum_seed);
 
 	if (len > 0 && s->count>0) {
 		build_hash_table(s);

receiver.c

@@ -46,6 +46,7 @@ extern int module_id;
 extern int ignore_errors;
 extern int orig_umask;
 extern int keep_partial;
+extern int checksum_seed;
 
 static void delete_one(char *fn, int is_dir)
 {
@@ -206,7 +207,7 @@ static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 
 	read_sum_head(f_in, &sum);
 
-	sum_init();
+	sum_init(checksum_seed);
 
 	while ((i = recv_token(f_in, &data)) != 0) {
 		if (do_progress)