small updates

TODO.markdown

@@ -6,6 +6,7 @@ need to be fixed.
 * Speed, we can always go faster. A simple reflect server now hits 35/45K qps
 * go test; only works correct on my machine
 * Add handy zone data structure (r/b tree)? Or not...
+* dnssec: DSA (also the keytag)
 
 ## Examples to add
 

keygen.go

@@ -25,6 +25,7 @@ func (r *RR_DNSKEY) Generate(bits int) (PrivateKey, error) {
 		if bits < 512 || bits > 4096 {
 			return nil, ErrKeySize
 		}
+	// TODO: check these limits
 	case RSASHA512:
 		if bits < 1024 || bits > 4096 {
 			return nil, ErrKeySize