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/*
 * mh_sha256_finalize_base.c contains the prototypes of mh_sha256_finalize_XXX
 * and mh_sha256_tail_XXX. Default definitions are base type which generates
 * mh_sha256_finalize_base and mh_sha256_tail_base. Other types are generated
 * through different predefined macros by mh_sha256.c.
 * mh_sha256_tail is used to calculate the last incomplete block of input
 * data. mh_sha256_finalize is the mh_sha256_ctx wrapper of mh_sha256_tail.
 */
#ifndef MH_SHA256_FINALIZE_FUNCTION
#include <string.h>
#include "mh_sha256_internal.h"

#define MH_SHA256_FINALIZE_FUNCTION	mh_sha256_finalize_base
#define MH_SHA256_TAIL_FUNCTION		mh_sha256_tail_base
#define MH_SHA256_BLOCK_FUNCTION	mh_sha256_block_base
#define MH_SHA256_FINALIZE_SLVER
#endif

void MH_SHA256_TAIL_FUNCTION(uint8_t * partial_buffer, uint32_t total_len,
			     uint32_t(*mh_sha256_segs_digests)[HASH_SEGS],
			     uint8_t * frame_buffer, uint32_t digests[SHA256_DIGEST_WORDS])
{
	uint64_t partial_buffer_len, len_in_bit;

	partial_buffer_len = total_len % MH_SHA256_BLOCK_SIZE;

	// Padding the first block
	partial_buffer[partial_buffer_len] = 0x80;
	partial_buffer_len++;
	memset(partial_buffer + partial_buffer_len, 0,
	       MH_SHA256_BLOCK_SIZE - partial_buffer_len);

	// Calculate the first block without total_length if padding needs 2 block
	if (partial_buffer_len > (MH_SHA256_BLOCK_SIZE - 8)) {
		MH_SHA256_BLOCK_FUNCTION(partial_buffer, mh_sha256_segs_digests, frame_buffer,
					 1);
		//Padding the second block
		memset(partial_buffer, 0, MH_SHA256_BLOCK_SIZE);
	}
	//Padding the block
	len_in_bit = to_be64((uint64_t) total_len * 8);
	*(uint64_t *) (partial_buffer + MH_SHA256_BLOCK_SIZE - 8) = len_in_bit;
	MH_SHA256_BLOCK_FUNCTION(partial_buffer, mh_sha256_segs_digests, frame_buffer, 1);

	//Calculate multi-hash SHA256 digests (segment digests as input message)
	sha256_for_mh_sha256((uint8_t *) mh_sha256_segs_digests, digests,
			     4 * SHA256_DIGEST_WORDS * HASH_SEGS);

	return;
}

int MH_SHA256_FINALIZE_FUNCTION(struct mh_sha256_ctx *ctx, void *mh_sha256_digest)
{
	uint8_t i;
	uint8_t *partial_block_buffer;
	uint64_t total_len;
	uint32_t(*mh_sha256_segs_digests)[HASH_SEGS];
	uint8_t *aligned_frame_buffer;

	if (ctx == NULL)
		return MH_SHA256_CTX_ERROR_NULL;

	total_len = ctx->total_length;
	partial_block_buffer = ctx->partial_block_buffer;

	/* mh_sha256 tail */
	aligned_frame_buffer = (uint8_t *) ALIGN_64(ctx->frame_buffer);
	mh_sha256_segs_digests = (uint32_t(*)[HASH_SEGS]) ctx->mh_sha256_interim_digests;

	MH_SHA256_TAIL_FUNCTION(partial_block_buffer, total_len, mh_sha256_segs_digests,
				aligned_frame_buffer, ctx->mh_sha256_digest);

	/* Output the digests of mh_sha256 */
	if (mh_sha256_digest != NULL) {
		for (i = 0; i < SHA256_DIGEST_WORDS; i++)
			((uint32_t *) mh_sha256_digest)[i] = ctx->mh_sha256_digest[i];
	}

	return MH_SHA256_CTX_ERROR_NONE;
}

#ifdef MH_SHA256_FINALIZE_SLVER
struct slver {
	uint16_t snum;
	uint8_t ver;
	uint8_t core;
};

// Version info
struct slver mh_sha256_finalize_base_slver_000002bb;
struct slver mh_sha256_finalize_base_slver = { 0x02bb, 0x00, 0x00 };
#endif