* rework dsa test

* add initial ed25519 (not done)

* fix common.Certificate compile error

* add more functions to crypto.SigningPrivateKey interface, not everyone implements them yet

lib/crypto/ed25519_test.go

@@ -0,0 +1,9 @@
+package crypto
+
+import (
+	"testing"
+)
+
+func TestEd25519(t *testing.T) {
+	
+}