implemented RFC3110 key builder in a plugin, added generic DNSKEY RR parsing

configure.in

@@ -309,6 +309,17 @@ AC_ARG_ENABLE(
 	pgp=true
 )
 
+AC_ARG_ENABLE(
+	[dnskey],
+	AS_HELP_STRING([--disable-dnskey],[disable DNS RR key decoding plugin. (default is NO).]),
+	[if test x$enableval = xyes; then
+		dnskey=true
+	 else
+		dnskey=false
+	fi],
+	dnskey=true
+)
+
 AC_ARG_ENABLE(
 	[pem],
 	AS_HELP_STRING([--disable-pem],[disable PEM decoding plugin. (default is NO).]),
@@ -1222,6 +1233,10 @@ if test x$pgp = xtrue; then
 	libstrongswan_plugins=${libstrongswan_plugins}" pgp"
 	pluto_plugins=${pluto_plugins}" pgp"
 fi
+if test x$dnskey = xtrue; then
+	libstrongswan_plugins=${libstrongswan_plugins}" dnskey"
+	pluto_plugins=${pluto_plugins}" dnskey"
+fi
 if test x$pem = xtrue; then
 	libstrongswan_plugins=${libstrongswan_plugins}" pem"
 	pluto_plugins=${pluto_plugins}" pem"
@@ -1284,6 +1299,7 @@ AM_CONDITIONAL(USE_X509, test x$x509 = xtrue)
 AM_CONDITIONAL(USE_PUBKEY, test x$pubkey = xtrue)
 AM_CONDITIONAL(USE_PKCS1, test x$pkcs1 = xtrue)
 AM_CONDITIONAL(USE_PGP, test x$pgp = xtrue)
+AM_CONDITIONAL(USE_DNSKEY, test x$dnskey = xtrue)
 AM_CONDITIONAL(USE_PEM, test x$pem = xtrue)
 AM_CONDITIONAL(USE_HMAC, test x$hmac = xtrue)
 AM_CONDITIONAL(USE_XCBC, test x$xcbc = xtrue)
@@ -1381,6 +1397,7 @@ AC_OUTPUT(
 	src/libstrongswan/plugins/pubkey/Makefile
 	src/libstrongswan/plugins/pkcs1/Makefile
 	src/libstrongswan/plugins/pgp/Makefile
+	src/libstrongswan/plugins/dnskey/Makefile
 	src/libstrongswan/plugins/pem/Makefile
 	src/libstrongswan/plugins/curl/Makefile
 	src/libstrongswan/plugins/ldap/Makefile