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#ifndef _MH_SHA256_INTERNAL_H_
#define _MH_SHA256_INTERNAL_H_

/**
 *  @file mh_sha256_internal.h
 *  @brief mh_sha256 internal function prototypes and macros
 *
 *  Interface for mh_sha256 internal functions
 *
 */
#include <stdint.h>
#include "mh_sha256.h"
#include "endian_helper.h"

#ifdef __cplusplus
 extern "C" {
#endif

#ifdef _MSC_VER
# define inline __inline
#endif

 // 64byte pointer align
#define ALIGN_64(pointer) ( ((uint64_t)(pointer) + 0x3F)&(~0x3F) )

 /*******************************************************************
  *mh_sha256 constants and macros
  ******************************************************************/
 /* mh_sha256 constants */
#define MH_SHA256_H0 0x6a09e667UL
#define MH_SHA256_H1 0xbb67ae85UL
#define MH_SHA256_H2 0x3c6ef372UL
#define MH_SHA256_H3 0xa54ff53aUL
#define MH_SHA256_H4 0x510e527fUL
#define MH_SHA256_H5 0x9b05688cUL
#define MH_SHA256_H6 0x1f83d9abUL
#define MH_SHA256_H7 0x5be0cd19UL

 /* mh_sha256 macros */
#define ror32(x, r) (((x)>>(r)) ^ ((x)<<(32-(r))))

#define S0(w) (ror32(w,7) ^ ror32(w,18) ^ (w >> 3))
#define S1(w) (ror32(w,17) ^ ror32(w,19) ^ (w >> 10))

#define s0(a) (ror32(a,2) ^ ror32(a,13) ^ ror32(a,22))
#define s1(e) (ror32(e,6) ^ ror32(e,11) ^ ror32(e,25))
#define maj(a,b,c) ((a & b) ^ (a & c) ^ (b & c))
#define ch(e,f,g) ((e & f) ^ (g & ~e))

 /*******************************************************************
  * SHA256 API internal function prototypes
  ******************************************************************/

 /**
  * @brief Performs complete SHA256 algorithm.
  *
  * @param input  Pointer to buffer containing the input message.
  * @param digest Pointer to digest to update.
  * @param len	  Length of buffer.
  * @returns None
  */
 void sha256_for_mh_sha256(const uint8_t * input_data, uint32_t * digest, const uint32_t len);

 /**
  * @brief Calculate sha256 digest of blocks which size is SHA256_BLOCK_SIZE
  *
  * @param data   Pointer to data buffer containing the input message.
  * @param digest Pointer to sha256 digest.
  * @returns None
  */
 void sha256_single_for_mh_sha256(const uint8_t * data, uint32_t digest[]);

 /*******************************************************************
  * mh_sha256 API internal function prototypes
  * Multiple versions of Update and Finalize functions are supplied which use
  * multiple versions of block and tail process subfunctions.
  ******************************************************************/

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * This function determines what instruction sets are enabled and selects the
  * appropriate version at runtime.
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @returns none
  *
  */
 void mh_sha256_tail(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  mh_sha256_digest mh_sha256 digest
  * @returns none
  *
  */
 void mh_sha256_tail_base(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * @requires SSE
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  mh_sha256_digest mh_sha256 digest
  * @returns none
  *
  */
 void mh_sha256_tail_sse(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * @requires AVX
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  mh_sha256_digest mh_sha256 digest
  * @returns none
  *
  */
 void mh_sha256_tail_avx(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * @requires AVX2
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  mh_sha256_digest mh_sha256 digest
  * @returns none
  *
  */
 void mh_sha256_tail_avx2(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Tail process for multi-hash sha256.
  *
  * Calculate the remainder of input data which is less than MH_SHA256_BLOCK_SIZE.
  * It will output the final SHA256 digest based on mh_sha256_segs_digests.
  *
  * @requires AVX512
  *
  * @param  partial_buffer Pointer to the start addr of remainder
  * @param  total_len The total length of all sections of input data.
  * @param  mh_sha256_segs_digests The digests of all 16 segments .
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  mh_sha256_digest mh_sha256 digest
  * @returns none
  *
  */
 void mh_sha256_tail_avx512(uint8_t *partial_buffer, uint32_t total_len,
			 uint32_t (*mh_sha256_segs_digests)[HASH_SEGS],
			 uint8_t *frame_buffer, uint32_t mh_sha256_digest[SHA256_DIGEST_WORDS]);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * This function determines what instruction sets are enabled and selects the
  * appropriate version at runtime.
  *
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block_base(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * @requires SSE
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block_sse(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * @requires AVX
  *
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block_avx(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * @requires AVX2
  *
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block_avx2(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

 /**
  * @brief  Calculate mh_sha256 digest of blocks which size is MH_SHA256_BLOCK_SIZE*N.
  *
  * @requires AVX512
  *
  * @param  input_data Pointer to input data to be processed
  * @param  digests 16 segments digests
  * @param  frame_buffer Pointer to buffer which is a temp working area
  * @param  num_blocks The number of blocks.
  * @returns none
  *
  */
 void mh_sha256_block_avx512(const uint8_t * input_data, uint32_t digests[SHA256_DIGEST_WORDS][HASH_SEGS],
			 uint8_t frame_buffer[MH_SHA256_BLOCK_SIZE], uint32_t num_blocks);

#ifdef __cplusplus
}
#endif

#endif