#ifndef __GRADIDO_LOGIN_SERVER_CRYPTO_ED25519_H
#define __GRADIDO_LOGIN_SERVER_CRYPTO_ED25519_H

#include "IKeyPair.h"

/*!
 * \author: Dario Rekowski
 * 
 * \date: 2020-06-04
 * 
 * \brief: Key Pairs class for ed25519 keys, used for default gradido transactions
*/

#include "../SingletonManager/MemoryManager.h"
#include "sodium.h"
#include "Passphrase.h"

class KeyPairEd25519 : public IKeyPair
{
public:
	//! \param privateKey: take ownership, release after object destruction
	//! \param publicKey: copy
	KeyPairEd25519(MemoryBin* privateKey, const unsigned char* publicKey);

	~KeyPairEd25519();

	//! \param passphrase must contain word indices
	//! \return create KeyPairEd25519, caller muss call delete at return after finish
	static KeyPairEd25519* create(const Passphrase* passphrase);

	//! \return caller take ownership of return value
	MemoryBin* sign(const MemoryBin* message);

	inline const unsigned char* getPublicKey() const { return mSodiumPublic; }

protected:	
	KeyPairEd25519();
private:
	// 64 Byte
	//! \brief ed25519 libsodium private key
	//! 
	//! Why it is a pointer and the public is an array?
	//! TODO: replace MemoryBin by a memory obfuscation class which make it hard to steal the private key from memory
	MemoryBin* mSodiumSecret;

	// 32 Byte
	//! \brief ed25519 libsodium public key
	unsigned char mSodiumPublic[crypto_sign_PUBLICKEYBYTES];
};

#endif //__GRADIDO_LOGIN_SERVER_CRYPTO_ED25519_H