Use Oneof for key types. closes #54
Use Oneof for key types. closes #54

google/keytransparency,cesarghali/keytransparency,google/keytransparency,AMarcedone/keytransparency,AMarcedone/keytransparency,gdbelvin/keytransparency,cesarghali/keytransparency,gdbelvin/keytransparency,alsophian/keytransparency,alsophian/keytransparency