isisd: implement MD5 circuit authentication
* Replace command "isis passwd" with "isis passwd {clear|md5}"
* Verify HMAC MD5 on ISIS Hello PDUs
* Add HMAC MD5 authentication to md5.h/md5.c from RFC2104
diff --git a/isisd/isis_common.h b/isisd/isis_common.h
index 2633855..334d339 100644
--- a/isisd/isis_common.h
+++ b/isisd/isis_common.h
@@ -35,6 +35,7 @@
u_char len;
#define ISIS_PASSWD_TYPE_UNUSED 0
#define ISIS_PASSWD_TYPE_CLEARTXT 1
+#define ISIS_PASSWD_TYPE_HMAC_MD5 54
#define ISIS_PASSWD_TYPE_PRIVATE 255
u_char type;
/* Authenticate SNPs? */