--- libtelnet/encrypt.c	1998-04-01 11:32:02.000000000 +0000
+++ libtelnet/encrypt.c.oden	2011-12-28 10:28:31.000000000 +0000
@@ -737,6 +737,9 @@ encrypt_keyid(struct key_info *kp, unsig
     int dir = kp->dir;
     int ret = 0;
 
+    if (len > MAXKEYLEN)
+        len = MAXKEYLEN;
+
     if (!(ep = (*kp->getcrypt)(*kp->modep))) {
 	if (len == 0)
 	    return;