Allow Cipher and Digest "none".

[tinc] / src / protocol_key.c

diff --git a/src/protocol_key.c b/src/protocol_key.c
index b8744a9..e838f61 100644 (file)
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -260,24 +260,31 @@ bool send_ans_key(node_t *to) {
        if(to->status.sptps)
                abort();
 
-       size_t keylen = cipher_keylength(myself->incipher);
+       size_t keylen = myself->incipher ? cipher_keylength(myself->incipher) : 1;
        char key[keylen * 2 + 1];
 
+       randomize(key, keylen);
+
        cipher_close(to->incipher);
        digest_close(to->indigest);
 
-       to->incipher = cipher_open_by_nid(cipher_get_nid(myself->incipher));
-       to->indigest = digest_open_by_nid(digest_get_nid(myself->indigest), digest_length(myself->indigest));
-       to->incompression = myself->incompression;
+       if(myself->incipher) {
+               to->incipher = cipher_open_by_nid(cipher_get_nid(myself->incipher));
+               if(!to->incipher)
+                       abort();
+               if(!cipher_set_key(to->incipher, key, false))
+                       abort();
+       }
 
-       if(!to->incipher || !to->indigest)
-               abort();
+       if(myself->indigest) {
+               to->indigest = digest_open_by_nid(digest_get_nid(myself->indigest), digest_length(myself->indigest));
+               if(!to->indigest)
+                       abort();
+               if(!digest_set_key(to->indigest, key, keylen))
+                       abort();
+       }
 
-       randomize(key, keylen);
-       if(!cipher_set_key(to->incipher, key, false))
-               abort();
-       if(!digest_set_key(to->indigest, key, keylen))
-               abort();
+       to->incompression = myself->incompression;
 
        bin2hex(key, key, keylen);
 
@@ -422,16 +429,16 @@ bool ans_key_h(connection_t *c, const char *request) {
 
        keylen = hex2bin(key, key, sizeof key);
 
-       if(keylen != cipher_keylength(from->outcipher)) {
+       if(keylen != (from->outcipher ? cipher_keylength(from->outcipher) : 1)) {
                logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name, from->hostname);
                return true;
        }
 
        /* Update our copy of the origin's packet key */
 
-       if(!cipher_set_key(from->outcipher, key, true))
+       if(from->outcipher && !cipher_set_key(from->outcipher, key, true))
                return false;
-       if(!digest_set_key(from->outdigest, key, keylen))
+       if(from->outdigest && !digest_set_key(from->outdigest, key, keylen))
                return false;
 
        from->status.validkey = true;