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 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European 
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/*
 * XSEC
 *
 * WinCAPICryptoKeyDSA := DSA Keys
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: WinCAPICryptoKeyDSA.hpp,v 1.1 2003/04/07 12:13:35 blautenb Exp $
 *
 */

#ifndef WINCAPICRYPTOKEYDSA_INCLUDE
#define WINCAPICRYPTOKEYDSA_INCLUDE

#include <xsec/enc/XSECCryptoKeyDSA.hpp>

#if !defined(_WIN32_WINNT)
#	define _WIN32_WINNT 0x0400
#endif

#include <wincrypt.h>

class WinCAPICryptoProvider;

class DSIG_EXPORT WinCAPICryptoKeyDSA : public XSECCryptoKeyDSA {

public :

	// Constructors/Destructors
	
	WinCAPICryptoKeyDSA(WinCAPICryptoProvider * owner);
	virtual ~WinCAPICryptoKeyDSA();

	/**
	 * \brief Dedicated WinCAPI constructor
	 *
	 * Create a DSA key for use in XSEC from an existing HCRYPTKEY
	 *
	 * @param owner The owner provider object (needed to find CSP)
	 * @param k The key to use
	 * @param havePrivate The CSP holds the private key as well as public
	 * @note k is owned by the library.  When the wrapper 
	 * WinCAPICryptoKeyDSA is deleted, k will be destroyed using
	 * CryptDestroyKey()
	 */

	WinCAPICryptoKeyDSA(WinCAPICryptoProvider * owner, HCRYPTKEY k, bool havePrivate = false);

	// Generic key functions

	virtual XSECCryptoKey::KeyType getKeyType();
	virtual const XMLCh * getProviderName() {return DSIGConstants::s_unicodeStrPROVWinCAPI;}
	virtual XSECCryptoKey * clone();

	// DSA Specific Functions

	virtual void loadPBase64BigNums(const char * b64, unsigned int len);
	virtual void loadQBase64BigNums(const char * b64, unsigned int len);
	virtual void loadGBase64BigNums(const char * b64, unsigned int len);
	virtual void loadYBase64BigNums(const char * b64, unsigned int len);
	virtual void loadJBase64BigNums(const char * b64, unsigned int len);

	// Signatures
	virtual bool verifyBase64Signature(unsigned char * hashBuf, 
							 unsigned int hashLen,
							 char * base64Signature,
							 unsigned int sigLen);

	virtual unsigned int signBase64Signature(unsigned char * hashBuf,
		unsigned int hashLen,
		char * base64SignatureBuf,
		unsigned int base64SignatureBufLen);

	// Some useful functions for extracting parameters from a Windows key

	unsigned int getPBase64BigNums(char * b64, unsigned int len);
	unsigned int getQBase64BigNums(char * b64, unsigned int len);
	unsigned int getGBase64BigNums(char * b64, unsigned int len);
	unsigned int getYBase64BigNums(char * b64, unsigned int len);



private:

	HCRYPTKEY					m_key;	
	WinCAPICryptoProvider		* mp_ownerProvider;
	bool						m_havePrivate;		// Do we have the private key?

	BYTE						* mp_P;
	BYTE						* mp_Q;
	BYTE						* mp_G;
	BYTE						* mp_Y;

	unsigned int				m_PLen;
	unsigned int				m_QLen;
	unsigned int				m_GLen;
	unsigned int				m_YLen;

	// Instruct to import from parameters

	void importKey(void);
	void loadParamsFromKey(void);

	// No default constructor
	WinCAPICryptoKeyDSA();
};

#endif /* WINCAPICRYPTOKEYDSA_INCLUDE */