/*   ==================================================================

     >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
     ------------------------------------------------------------------
     Copyright (c) 2019-2020 by Lattice Semiconductor Corporation
     ALL RIGHTS RESERVED
     ------------------------------------------------------------------

       IMPORTANT: THIS FILE IS USED BY OR GENERATED BY the LATTICE PROPEL™
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       Lattice grants permission to use this code pursuant to the
       terms of the Lattice Propel License Agreement.

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     ================================================================== */

#ifndef ESB_H_
#define ESB_H_

#define NUM_ECC_DIGITS 32
#define NUM_DIGEST_INT 16	// Digest 16 int

extern struct esb_instance esb_machxo3d_esb;
typedef struct EccPoint {
	unsigned char x[NUM_ECC_DIGITS];
	unsigned char y[NUM_ECC_DIGITS];
} EccPoint;

enum esb_state {
	ESB_RO_GP0_READY = 0xB0,
	ESB_RO_GP0_BUSY = 0xB1,
	ESB_RO_GP0_DONE = 0xB2,
};

struct sha256_ctx {
	unsigned char *data_in;
	unsigned int length;
	unsigned int *digest_out;	//[NUM_DIGEST_INT];

	unsigned char (*spiRead2ESB_fun) (void *this_spi,
					  unsigned int addr,
					  unsigned int len,
					  unsigned char addr4B);
	void *spi_master;
	unsigned int start_address;
	unsigned int image_size;
	unsigned char addr4B;
};

struct esb_instance {
	char *instance_name;
	unsigned int base_addr;
};

#define ESB_PORT_WISHBONE  (2)
#define ESB_PORT_HSP	   (3)

unsigned char esb_init(struct esb_instance *this_esb,
		       unsigned int base_addr);
unsigned char esb_mux_port_sel(struct esb_instance *this_esb,
			       unsigned int sel_port);
unsigned char esb_switch_idle(struct esb_instance *this_esb);
unsigned char esb_trng32bits_get(struct esb_instance *this_esb,
				 unsigned int *trn_value);
unsigned char esb_nonce_get(struct esb_instance *this_esb,
			    unsigned char p_trn[16]);
unsigned char esb_trng256bits_get(struct esb_instance *this_esb,
				  unsigned char p_trn[32]);

//Key Exchange
unsigned char esb_pubkey_derive(struct esb_instance *this_esb,
				EccPoint * p_publicKey,
				unsigned char
				p_privateKey[NUM_ECC_DIGITS]);
unsigned char esb_ecdh_get(struct esb_instance *this_esb,
			   unsigned char p_secret[NUM_ECC_DIGITS],
			   EccPoint * p_publicKey,
			   unsigned char p_privateKey[NUM_ECC_DIGITS]);

//AES
unsigned char esb_aes(struct esb_instance *this_esb, unsigned char *key,
		      unsigned char *bufferIn, unsigned char *bufferOut,
		      unsigned int decrypt);
unsigned char esb_sha256(struct esb_instance *this_esb,
			 struct sha256_ctx *ctx);
unsigned char esb_esdsa_verify(struct esb_instance *this_esb,
			       unsigned int digest[],
			       unsigned int pub_key[],
			       unsigned int signature[],
			       unsigned char *auth_pass);
unsigned char get_nonce(struct esb_instance *this_esb,
			unsigned char p_trn[16]);
#endif				/* ESB_ECDH_H_ */