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#ifndef _SHA512_MB_H_
#define _SHA512_MB_H_

/**
 *  @file sha512_mb.h
 *  @brief Single/Multi-buffer CTX API SHA512 function prototypes and structures
 *
 * Interface for single and multi-buffer SHA512 functions
 *
 * <b> Single/Multi-buffer SHA512  Entire or First-Update..Update-Last </b>
 *
 * The interface to this single/multi-buffer hashing code is carried out through the
 * context-level (CTX) init, submit and flush functions and the SHA512_HASH_CTX_MGR and
 * SHA512_HASH_CTX objects. Numerous SHA512_HASH_CTX objects may be instantiated by the
 * application for use with a single SHA512_HASH_CTX_MGR.
 *
 * The CTX interface functions carry out the initialization and padding of the jobs
 * entered by the user and add them to the multi-buffer manager. The lower level "scheduler"
 * layer then processes the jobs in an out-of-order manner. The scheduler layer functions
 * are internal and are not intended to be invoked directly. Jobs can be submitted
 * to a CTX as a complete buffer to be hashed, using the HASH_ENTIRE flag, or as partial
 * jobs which can be started using the HASH_FIRST flag, and later resumed or finished
 * using the HASH_UPDATE and HASH_LAST flags respectively.
 *
 * <b>Note:</b> The submit function does not require data buffers to be block sized.
 *
 * The SHA512 CTX interface functions are available for 5 architectures: multi-buffer SSE,
 * AVX, AVX2, AVX512 and single-buffer SSE4 (which is used in the same way as the
 * multi-buffer code). In addition, a multibinary interface is provided, which selects the
 * appropriate architecture-specific function at runtime. This multibinary interface
 * selects the single buffer SSE4 functions when the platform is detected to be Silvermont.
 *
 * <b>Usage:</b> The application creates a SHA512_HASH_CTX_MGR object and initializes it
 * with a call to sha512_ctx_mgr_init*() function, where henceforth "*" stands for the
 * relevant suffix for each architecture; _sse, _avx, _avx2, _avx512(or no suffix for the
 * multibinary version). The SHA512_HASH_CTX_MGR object will be used to schedule processor
 * resources, with up to 2 SHA512_HASH_CTX objects (or 4 in the AVX2 case, 8 in the AVX512
 * case) being processed at a time.
 *
 * Each SHA512_HASH_CTX must be initialized before first use by the hash_ctx_init macro
 * defined in multi_buffer.h. After initialization, the application may begin computing
 * a hash by giving the SHA512_HASH_CTX to a SHA512_HASH_CTX_MGR using the submit functions
 * sha512_ctx_mgr_submit*() with the HASH_FIRST flag set. When the SHA512_HASH_CTX is
 * returned to the application (via this or a later call to sha512_ctx_mgr_submit*() or
 * sha512_ctx_mgr_flush*()), the application can then re-submit it with another call to
 * sha512_ctx_mgr_submit*(), but without the HASH_FIRST flag set.
 *
 * Ideally, on the last buffer for that hash, sha512_ctx_mgr_submit_sse is called with
 * HASH_LAST, although it is also possible to submit the hash with HASH_LAST and a zero
 * length if necessary. When a SHA512_HASH_CTX is returned after having been submitted with
 * HASH_LAST, it will contain a valid hash. The SHA512_HASH_CTX can be reused immediately
 * by submitting with HASH_FIRST.
 *
 * For example, you would submit hashes with the following flags for the following numbers
 * of buffers:
 * <ul>
 *  <li> one buffer: HASH_FIRST | HASH_LAST  (or, equivalently, HASH_ENTIRE)
 *  <li> two buffers: HASH_FIRST, HASH_LAST
 *  <li> three buffers: HASH_FIRST, HASH_UPDATE, HASH_LAST
 * etc.
 * </ul>
 *
 * The order in which SHA512_CTX objects are returned is in general different from the order
 * in which they are submitted.
 *
 * A few possible error conditions exist:
 * <ul>
 *  <li> Submitting flags other than the allowed entire/first/update/last values
 *  <li> Submitting a context that is currently being managed by a SHA512_HASH_CTX_MGR. (Note:
 *   This error case is not applicable to the single buffer SSE4 version)
 *  <li> Submitting a context after HASH_LAST is used but before HASH_FIRST is set.
 * </ul>
 *
 *  These error conditions are reported by returning the SHA512_HASH_CTX immediately after
 *  a submit with its error member set to a non-zero error code (defined in
 *  multi_buffer.h). No changes are made to the SHA512_HASH_CTX_MGR in the case of an
 *  error; no processing is done for other hashes.
 *
 */

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

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

#ifdef __cplusplus
extern "C" {
#endif

// Hash Constants and Typedefs
#define SHA512_DIGEST_NWORDS		8
#define SHA512_MAX_LANES		8
#define SHA512_X4_LANES			4
#define SHA512_MIN_LANES		2
#define SHA512_BLOCK_SIZE		128
#define SHA512_LOG2_BLOCK_SIZE		7
#define SHA512_PADLENGTHFIELD_SIZE	16
#define SHA512_INITIAL_DIGEST		\
	0x6a09e667f3bcc908,0xbb67ae8584caa73b,0x3c6ef372fe94f82b,0xa54ff53a5f1d36f1, \
	0x510e527fade682d1,0x9b05688c2b3e6c1f,0x1f83d9abfb41bd6b,0x5be0cd19137e2179


typedef uint64_t sha512_digest_array[SHA512_DIGEST_NWORDS][SHA512_MAX_LANES];
typedef uint64_t SHA512_WORD_T;

/** @brief Scheduler layer - Holds info describing a single SHA512 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(uint64_t result_digest[SHA512_DIGEST_NWORDS], 64);
	JOB_STS status;		//!< output job status
	void*   user_data;	//!< pointer for user's job-related data
} SHA512_JOB;

/** @brief Scheduler layer -  Holds arguments for submitted SHA512 job */

typedef struct {
	sha512_digest_array digest;
	uint8_t* data_ptr[SHA512_MAX_LANES];
} SHA512_MB_ARGS_X8;

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

typedef struct {
	SHA512_JOB *job_in_lane;
} SHA512_LANE_DATA;

/** @brief Scheduler layer - Holds state for multi-buffer SHA512 jobs */

typedef struct {
	SHA512_MB_ARGS_X8 args;
	uint64_t lens[SHA512_MAX_LANES];
	uint64_t unused_lanes;	//!< each byte is index (00, 01 or 00...03) of unused lanes, byte 2 or 4 is set to FF as a flag
	SHA512_LANE_DATA ldata[SHA512_MAX_LANES];
	uint32_t num_lanes_inuse;
} SHA512_MB_JOB_MGR;

/** @brief Context layer - Holds state for multi-buffer SHA512 jobs */

typedef struct {
	SHA512_MB_JOB_MGR mgr;
} SHA512_HASH_CTX_MGR;

/** @brief Context layer - Holds info describing a single SHA512 job for the multi-buffer CTX manager */

typedef struct {
	SHA512_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[SHA512_BLOCK_SIZE * 2]; //!< CTX partial blocks
	uint32_t	partial_block_buffer_length;
	void*		user_data;	//!< pointer for user to keep any job-related data
} SHA512_HASH_CTX;

/*******************************************************************
 * Context level API function prototypes
 ******************************************************************/

/**
 * @brief Initialize the context level SHA512 multi-buffer manager structure.
 * @requires SSE4.1
 *
 * @param mgr Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init_sse   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the context level multi-buffer manager.
 * @requires SSE4.1
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit_sse (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
					const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires SSE4.1
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush_sse  (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief Initialize the SHA512 multi-buffer manager structure.
 * @requires AVX
 *
 * @param mgr Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init_avx   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the multi-buffer manager.
 * @requires AVX
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit_avx (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
					const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires AVX
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush_avx  (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief Initialize the SHA512 multi-buffer manager structure.
 * @requires AVX2
 *
 * @param mgr	Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init_avx2   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the multi-buffer manager.
 * @requires AVX2
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit_avx2 (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
					const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires AVX2
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush_avx2  (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief Initialize the SHA512 multi-buffer manager structure.
 * @requires AVX512
 *
 * @param mgr	Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init_avx512   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the multi-buffer manager.
 * @requires AVX512
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit_avx512 (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
					const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires AVX512
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush_avx512  (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief Initialize the SHA512 multi-buffer manager structure.
 * @requires SSE4
 *
 * @param mgr	Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init_sb_sse4   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the multi-buffer manager.
 * @requires SSE4
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit_sb_sse4 (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
					const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires SSE4
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush_sb_sse4  (SHA512_HASH_CTX_MGR* mgr);

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

/**
 * @brief Initialize the SHA512 multi-buffer manager structure.
 * @requires SSE4.1 or AVX or AVX2 or AVX512
 *
 * @param mgr	Structure holding context level state info
 * @returns void
 */
void      sha512_ctx_mgr_init   (SHA512_HASH_CTX_MGR* mgr);

/**
 * @brief  Submit a new SHA512 job to the multi-buffer manager.
 * @requires SSE4.1 or AVX or AVX2 or AVX512
 *
 * @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.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_submit (SHA512_HASH_CTX_MGR* mgr, SHA512_HASH_CTX* ctx,
				const void* buffer, uint32_t len, HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA512 jobs and return when complete.
 * @requires SSE4.1 or AVX or AVX2 or AVX512
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
SHA512_HASH_CTX* sha512_ctx_mgr_flush  (SHA512_HASH_CTX_MGR* mgr);

/*******************************************************************
 * Scheduler (internal) level out-of-order function prototypes
 ******************************************************************/

void        sha512_mb_mgr_init_sse   (SHA512_MB_JOB_MGR *state);
SHA512_JOB* sha512_mb_mgr_submit_sse (SHA512_MB_JOB_MGR *state, SHA512_JOB* job);
SHA512_JOB* sha512_mb_mgr_flush_sse  (SHA512_MB_JOB_MGR *state);

#define     sha512_mb_mgr_init_avx   sha512_mb_mgr_init_sse
SHA512_JOB* sha512_mb_mgr_submit_avx (SHA512_MB_JOB_MGR *state, SHA512_JOB* job);
SHA512_JOB* sha512_mb_mgr_flush_avx  (SHA512_MB_JOB_MGR *state);

void        sha512_mb_mgr_init_avx2   (SHA512_MB_JOB_MGR *state);
SHA512_JOB* sha512_mb_mgr_submit_avx2 (SHA512_MB_JOB_MGR *state, SHA512_JOB* job);
SHA512_JOB* sha512_mb_mgr_flush_avx2  (SHA512_MB_JOB_MGR *state);

void        sha512_mb_mgr_init_avx512   (SHA512_MB_JOB_MGR *state);
SHA512_JOB* sha512_mb_mgr_submit_avx512 (SHA512_MB_JOB_MGR *state, SHA512_JOB* job);
SHA512_JOB* sha512_mb_mgr_flush_avx512  (SHA512_MB_JOB_MGR *state);

// Single buffer SHA512 APIs, optimized for SLM.
void        sha512_sse4              (const void* M, void* D, uint64_t L);
// Note that these APIs comply with multi-buffer APIs' high level usage
void        sha512_sb_mgr_init_sse4   (SHA512_MB_JOB_MGR *state);
SHA512_JOB* sha512_sb_mgr_submit_sse4 (SHA512_MB_JOB_MGR *state, SHA512_JOB* job);
SHA512_JOB* sha512_sb_mgr_flush_sse4  (SHA512_MB_JOB_MGR *state);

#ifdef __cplusplus
}
#endif

#endif // _SHA512_MB_H_