1 files changed, 4 insertions, 2 deletions
diff --git a/include/Signature.hpp b/include/Signature.hpp
index 90d5278..ea776ea 100644
--- a/include/Signature.hpp
+++ b/include/Signature.hpp
@@ -31,8 +31,10 @@ namespace odhtdb
         {
             friend class KeyPair;
         public:
+            static PublicKey ZERO;
+            
             // Throws InvalidSignatureKeySize if size is not PUBLIC_KEY_NUM_BYTES
-            PublicKey(char *data, size_t size);
+            PublicKey(const char *data, size_t size);
             PublicKey(const PublicKey &other);
             PublicKey& operator=(const PublicKey &other);
             
@@ -51,7 +53,7 @@ namespace odhtdb
             friend class KeyPair;
         public:
             // Throws InvalidSignatureKeySize if size is not PRIVATE_KEY_NUM_BYTES
-            PrivateKey(char *data, size_t size);
+            PrivateKey(const char *data, size_t size);
             PrivateKey(const PrivateKey &other);
             PrivateKey& operator=(const PrivateKey &other);