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///////////////////////////////////////////////////////////////////////////////
//
/// \file check.h
/// \brief Internal API to different integrity check functions
//
// This code has been put into the public domain.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef LZMA_CHECK_H
#define LZMA_CHECK_H
#include "common.h"
// Index hashing needs the best possible hash function (preferably
// a cryptographic hash) for maximum reliability.
#if defined(HAVE_CHECK_SHA256)
# define LZMA_CHECK_BEST LZMA_CHECK_SHA256
#elif defined(HAVE_CHECK_CRC64)
# define LZMA_CHECK_BEST LZMA_CHECK_CRC64
#else
# define LZMA_CHECK_BEST LZMA_CHECK_CRC32
#endif
/// \brief Structure to hold internal state of the check being calculated
///
/// \note This is not in the public API because this structure may
/// change in future if new integrity check algorithms are added.
typedef struct {
/// Buffer to hold the final result and a temporary buffer for SHA256.
union {
uint8_t u8[64];
uint32_t u32[16];
uint64_t u64[8];
} buffer;
/// Check-specific data
union {
uint32_t crc32;
uint64_t crc64;
struct {
/// Internal state
uint32_t state[8];
/// Size of the message excluding padding
uint64_t size;
} sha256;
} state;
} lzma_check_state;
#ifdef HAVE_SMALL
extern uint32_t lzma_crc32_table[8][256];
extern uint64_t lzma_crc64_table[4][256];
#else
extern const uint32_t lzma_crc32_table[8][256];
extern const uint64_t lzma_crc64_table[4][256];
#endif
/// \brief Initializes *check depending on type
///
/// \return LZMA_OK on success. LZMA_UNSUPPORTED_CHECK if the type is not
/// supported by the current version or build of liblzma.
/// LZMA_PROG_ERROR if type > LZMA_CHECK_ID_MAX.
///
extern void lzma_check_init(lzma_check_state *check, lzma_check type);
/// \brief Updates *check
///
extern void lzma_check_update(lzma_check_state *check, lzma_check type,
const uint8_t *buf, size_t size);
/// \brief Finishes *check
///
extern void lzma_check_finish(lzma_check_state *check, lzma_check type);
extern void lzma_crc32_init(void);
extern void lzma_crc64_init(void);
extern void lzma_sha256_init(lzma_check_state *check);
extern void lzma_sha256_update(
const uint8_t *buf, size_t size, lzma_check_state *check);
extern void lzma_sha256_finish(lzma_check_state *check);
#endif
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