compute IdentHash in Identity method

Identity.cpp

@@ -26,6 +26,13 @@ namespace data
 		return count == sizeof(Identity);
 	}
 
+	IdentHash Identity::Hash()
+	{
+		IdentHash hash;
+		CryptoPP::SHA256().CalculateDigest(reinterpret_cast<uint8_t*>(&hash), reinterpret_cast<uint8_t*> (this), sizeof (Identity));
+		return hash;
+	}	
+	
 	PrivateKeys& PrivateKeys::operator=(const Keys& keys)
 	{
 		pub = keys;

Identity.h

@@ -9,6 +9,8 @@ namespace i2p
 {
 namespace data
 {
+	class IdentHash;
+
 #pragma pack(1)
 
 	struct DHKeysPair // transient keys for transport sessions
@@ -33,6 +35,7 @@ namespace data
 
 		Identity& operator=(const Keys& keys);
 		bool FromBase64(const std::string&);
+		IdentHash Hash();
 	};	
 	
 	struct PrivateKeys // for eepsites