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96 lines
2.6 KiB
96 lines
2.6 KiB
10 years ago
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file check.h
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/// \brief Internal API to different integrity check functions
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef LZMA_CHECK_H
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#define LZMA_CHECK_H
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#include "common.h"
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// Index hashing needs the best possible hash function (preferably
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// a cryptographic hash) for maximum reliability.
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#if defined(HAVE_CHECK_SHA256)
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# define LZMA_CHECK_BEST LZMA_CHECK_SHA256
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#elif defined(HAVE_CHECK_CRC64)
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# define LZMA_CHECK_BEST LZMA_CHECK_CRC64
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#else
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# define LZMA_CHECK_BEST LZMA_CHECK_CRC32
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#endif
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/// \brief Structure to hold internal state of the check being calculated
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///
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/// \note This is not in the public API because this structure may
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/// change in future if new integrity check algorithms are added.
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typedef struct {
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/// Buffer to hold the final result and a temporary buffer for SHA256.
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union {
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uint8_t u8[64];
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uint32_t u32[16];
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uint64_t u64[8];
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} buffer;
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/// Check-specific data
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union {
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uint32_t crc32;
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uint64_t crc64;
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struct {
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/// Internal state
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uint32_t state[8];
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/// Size of the message excluding padding
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uint64_t size;
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} sha256;
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} state;
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} lzma_check_state;
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/// lzma_crc32_table[0] is needed by LZ encoder so we need to keep
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/// the array two-dimensional.
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#ifdef HAVE_SMALL
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extern uint32_t lzma_crc32_table[1][256];
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extern void lzma_crc32_init(void);
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#else
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extern const uint32_t lzma_crc32_table[8][256];
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extern const uint64_t lzma_crc64_table[4][256];
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#endif
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/// \brief Initialize *check depending on type
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///
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/// \return LZMA_OK on success. LZMA_UNSUPPORTED_CHECK if the type is not
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/// supported by the current version or build of liblzma.
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/// LZMA_PROG_ERROR if type > LZMA_CHECK_ID_MAX.
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extern void lzma_check_init(lzma_check_state *check, lzma_check type);
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/// Update the check state
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extern void lzma_check_update(lzma_check_state *check, lzma_check type,
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const uint8_t *buf, size_t size);
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/// Finish the check calculation and store the result to check->buffer.u8.
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extern void lzma_check_finish(lzma_check_state *check, lzma_check type);
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/// Prepare SHA-256 state for new input.
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extern void lzma_sha256_init(lzma_check_state *check);
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/// Update the SHA-256 hash state
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extern void lzma_sha256_update(
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const uint8_t *buf, size_t size, lzma_check_state *check);
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/// Finish the SHA-256 calculation and store the result to check->buffer.u8.
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extern void lzma_sha256_finish(lzma_check_state *check);
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#endif
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