79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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/*-------------------------------------------------------------------------
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*
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* checksum_helper.h
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* Compute a checksum of any of various types using common routines
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*
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* Portions Copyright (c) 2016-2023, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/include/common/checksum_helper.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef CHECKSUM_HELPER_H
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#define CHECKSUM_HELPER_H
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#include "common/cryptohash.h"
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#include "common/sha2.h"
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#include "port/pg_crc32c.h"
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/*
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* Supported checksum types. It's not necessarily the case that code using
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* these functions needs a cryptographically strong checksum; it may only
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* need to detect accidental modification. That's why we include CRC-32C: it's
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* much faster than any of the other algorithms. On the other hand, we omit
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* MD5 here because any new that does need a cryptographically strong checksum
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* should use something better.
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*/
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typedef enum pg_checksum_type
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{
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#pragma push_macro("CHECKSUM_TYPE_NONE")
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#ifdef CHECKSUM_TYPE_NONE
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// winioctl.h defines CHECKSUM_TYPE_NONE to 0 as a macro.
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#undef CHECKSUM_TYPE_NONE
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#endif
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CHECKSUM_TYPE_NONE,
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#pragma pop_macro("CHECKSUM_TYPE_NONE")
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CHECKSUM_TYPE_CRC32C,
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CHECKSUM_TYPE_SHA224,
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CHECKSUM_TYPE_SHA256,
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CHECKSUM_TYPE_SHA384,
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CHECKSUM_TYPE_SHA512
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} pg_checksum_type;
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/*
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* This is just a union of all applicable context types.
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*/
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typedef union pg_checksum_raw_context
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{
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pg_crc32c c_crc32c;
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pg_cryptohash_ctx *c_sha2;
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} pg_checksum_raw_context;
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/*
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* This structure provides a convenient way to pass the checksum type and the
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* checksum context around together.
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*/
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typedef struct pg_checksum_context
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{
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pg_checksum_type type;
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pg_checksum_raw_context raw_context;
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} pg_checksum_context;
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/*
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* This is the longest possible output for any checksum algorithm supported
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* by this file.
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*/
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#define PG_CHECKSUM_MAX_LENGTH PG_SHA512_DIGEST_LENGTH
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extern bool pg_checksum_parse_type(char *name, pg_checksum_type *);
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extern char *pg_checksum_type_name(pg_checksum_type);
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extern int pg_checksum_init(pg_checksum_context *, pg_checksum_type);
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extern int pg_checksum_update(pg_checksum_context *, const uint8 *input,
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size_t len);
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extern int pg_checksum_final(pg_checksum_context *, uint8 *output);
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#endif
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