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