/*
************************************************************************
**
**	Copyright (c) 2010 by
**		Core|Vision B.V.
**		Cereslaan 10b
**		5384 VT  Heesch
**		The Netherlands
**
**	All Rights Reserved
**
************************************************************************
*/
/*
************************************************************************
**
**	Project name:   Dual Inventive: Utility Library
**	Filename:       cp3000-sign.h
**	Author:			Jack Weeland
**	Date:			January 27, 2010
**	File version:	1.00	of January 27, 2010
**
************************************************************************
*/
/*
************************************************************************
**
**	CP3000 digital signatures
**
************************************************************************
*/

#ifndef	__CP3000_SIGN_H
#define	__CP3000_SIGN_H

#include <di-util/cp3000-cert.h>

/*
**	Definitions - digital signature
*/

// length (in bits) of the signature
#define	DIGITAL_SIGNATURE_BITS	160

/*
**	Definitions - data types
*/

// Context for a digital signature
typedef struct CP3000_SIGNATURE *cp3000_signature_t;

/*
**	Exported functions - Digitial signatures and message digest
*/

// Calculate digital signature (three steps)
//	Three steps: init, add data component(s) and calculate signature (with clean-up).
//	Step 3 returns the size of the signature in bytes
cp3000_signature_t cp3000_sign_init(cp3000_key_t private_key);
int cp3000_sign_add(cp3000_signature_t, const char *s);
int cp3000_sign_done(cp3000_signature_t, unsigned char *signature, size_t sig_sz);

// Verify a digital signature
//	Three steps: init, add data component(s) and verify signature (with clean-up).
//	Step 3 returns 0 on success and -1 on error (i.e. signature not okay)
cp3000_signature_t cp3000_verify_init(cp3000_key_t public_key);
int cp3000_verify_add(cp3000_signature_t, const char *s);
int cp3000_verify_done(cp3000_signature_t, const unsigned char *signature, size_t sig_sz);

// Calculate message digest (three steps)
//	Three steps: init, add data component(s) and calculate the digest (with clean-up).
//	Step 3 returns the size of the signature in bytes
cp3000_signature_t cp3000_digest_init();
int cp3000_digest_add(cp3000_signature_t, const char *s);
int cp3000_digest_done(cp3000_signature_t, unsigned char *signature, size_t sig_sz);

#endif	/* __CP3000_SIGN_H */