Fixing off-by-one error in Curve client-auth public key hashing

mods/common.c

@@ -367,6 +367,8 @@ int rehash_keybags(struct keybaghash * o) {
 		struct keybag * curkey = o->data[kiter], *savekey;
 		while(curkey) {
 			uint32_t hash = fnv_hash(curkey->key) & newsize;
+			if(hash == newsize)
+				hash -= 1;
 			savekey = curkey->next;
 			curkey->next = newdata[hash];
 			newdata[hash] = curkey;
@@ -425,6 +427,8 @@ int read_keyfile(const char * path, struct keybaghash * o) {
 		}
 
 		uint32_t hashval = fnv_hash(nk->key) & o->buckets;
+		if(hashval == o->buckets)
+			hashval -= 1;
 
 		nk->next = o->data[hashval];
 		o->data[hashval] = nk;
@@ -540,6 +544,8 @@ void * zap_handler(void* zapsock) {
 
 		uint32_t hashval = fnv_hash(creds);
 		hashval &= bag.buckets;
+		if(hashval == bag.buckets)
+			hashval -= 1;
 
 		struct keybag * search = bag.data[hashval];