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#ifndef _SM3_MB_H_
#define _SM3_MB_H_


/**
 *  @file sm3_mb.h
 *  @brief Multi-buffer CTX API SM3 function prototypes and structures
 *
 *  \warning Experimental interface with only base functions available at this
 *           time.
 */

#include <stdint.h>
#include "multi_buffer.h"
#include "types.h"

#ifndef _MSC_VER
#include <stdbool.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

#define SM3_DIGEST_NWORDS		8	/* Word in SM3 is 32-bit */
#define SM3_MAX_LANES			16
#define SM3_X8_LANES                   8
#define SM3_BLOCK_SIZE			64
#define SM3_LOG2_BLOCK_SIZE			6
#define SM3_PADLENGTHFIELD_SIZE		8
#define SM3_INITIAL_DIGEST		\
	0x7380166f, 0x4914b2b9, 0x172442d7, 0xda8a0600, \
	0xa96f30bc, 0x163138aa, 0xe38dee4d, 0xb0fb0e4e

typedef uint32_t sm3_digest_array[SM3_DIGEST_NWORDS][SM3_MAX_LANES];
typedef uint32_t SM3_WORD_T;

/** @brief Scheduler layer - Holds info describing a single SM3 job for the multi-buffer manager */

typedef struct {
	uint8_t *buffer;	//!< pointer to data buffer for this job
	uint64_t len;	//!< length of buffer for this job in blocks.
	DECLARE_ALIGNED(uint32_t result_digest[SM3_DIGEST_NWORDS], 64);
	JOB_STS status;	//!< output job status
	void *user_data;	//!< pointer for user's job-related data
} SM3_JOB;

/** @brief Scheduler layer -  Holds arguments for submitted SM3 job */

typedef struct {
	sm3_digest_array digest;
	uint8_t *data_ptr[SM3_MAX_LANES];
} SM3_MB_ARGS_X16;

/** @brief Scheduler layer - Lane data */

typedef struct {
	SM3_JOB *job_in_lane;
} SM3_LANE_DATA;

/** @brief Scheduler layer - Holds state for multi-buffer SM3 jobs */

typedef struct {
	SM3_MB_ARGS_X16 args;
	uint32_t lens[SM3_MAX_LANES];
	uint64_t unused_lanes;	//!< each nibble is index (0...3 or 0...7) of unused lanes, nibble 4 or 8 is set to F as a flag
	SM3_LANE_DATA ldata[SM3_MAX_LANES];
	uint32_t num_lanes_inuse;
} SM3_MB_JOB_MGR;

/** @brief Context layer - Holds state for multi-buffer SM3 jobs */

typedef struct {
	SM3_MB_JOB_MGR mgr;
} SM3_HASH_CTX_MGR;

/** @brief Context layer - Holds info describing a single SM3 job for the multi-buffer CTX manager */

typedef struct {
	SM3_JOB job;	// Must be at struct offset 0.
	HASH_CTX_STS status;	//!< Context status flag
	HASH_CTX_ERROR error;	//!< Context error flag
	uint64_t total_length;	//!< Running counter of length processed for this CTX's job
	const void *incoming_buffer;	//!< pointer to data input buffer for this CTX's job
	uint32_t incoming_buffer_length;	//!< length of buffer for this job in bytes.
	uint8_t partial_block_buffer[SM3_BLOCK_SIZE * 2];	//!< CTX partial blocks
	uint32_t partial_block_buffer_length;
	void *user_data;	//!< pointer for user to keep any job-related data
} SM3_HASH_CTX;

/******************** multibinary function prototypes **********************/

/**
* @brief Initialize the SM3 multi-buffer manager structure.
*
* @param mgr	Structure holding context level state info
* @returns void
*/
void sm3_ctx_mgr_init(SM3_HASH_CTX_MGR * mgr);

/**
* @brief  Submit a new SM3 job to the multi-buffer manager.
*
* @param  mgr Structure holding context level state info
* @param  ctx Structure holding ctx job info
* @param  buffer Pointer to buffer to be processed
* @param  len Length of buffer (in bytes) to be processed
* @param  flags Input flag specifying job type (first, update, last or entire)
* @returns NULL if no jobs complete or pointer to jobs structure.
*/
SM3_HASH_CTX *sm3_ctx_mgr_submit(SM3_HASH_CTX_MGR * mgr, SM3_HASH_CTX * ctx,
				 const void *buffer, uint32_t len,
				 HASH_CTX_FLAG flags);

/**
* @brief Finish all submitted SM3 jobs and return when complete.
*
* @param mgr	Structure holding context level state info
* @returns NULL if no jobs to complete or pointer to jobs structure.
*/
SM3_HASH_CTX *sm3_ctx_mgr_flush(SM3_HASH_CTX_MGR * mgr);

#ifdef __cplusplus
}
#endif
#endif
