#ifndef HASH_H #define HASH_H #if defined(SHA1_APPLE) #include <CommonCrypto/CommonDigest.h> #elif defined(SHA1_OPENSSL) # include <openssl/sha.h> # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 #define SHA1_NEEDS_CLONE_HELPER # include "sha1/openssl.h" # endif #elif defined(SHA1_DC) #include "sha1dc_git.h" #else /* SHA1_BLK */ #include "block-sha1/sha1.h" #endif #if defined(SHA1_APPLE_UNSAFE) # include <CommonCrypto/CommonDigest.h> #define platform_SHA_CTX_unsafe … #define platform_SHA1_Init_unsafe … #define platform_SHA1_Update_unsafe … #define platform_SHA1_Final_unsafe … #elif defined(SHA1_OPENSSL_UNSAFE) # include <openssl/sha.h> # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 #define SHA1_NEEDS_CLONE_HELPER_UNSAFE # include "sha1/openssl.h" #define platform_SHA_CTX_unsafe … #define platform_SHA1_Init_unsafe … #define platform_SHA1_Clone_unsafe … #define platform_SHA1_Update_unsafe … #define platform_SHA1_Final_unsafe … # else #define platform_SHA_CTX_unsafe … #define platform_SHA1_Init_unsafe … #define platform_SHA1_Update_unsafe … #define platform_SHA1_Final_unsafe … # endif #elif defined(SHA1_BLK_UNSAFE) # include "block-sha1/sha1.h" #define platform_SHA_CTX_unsafe … #define platform_SHA1_Init_unsafe … #define platform_SHA1_Update_unsafe … #define platform_SHA1_Final_unsafe … #endif #if defined(SHA256_NETTLE) #include "sha256/nettle.h" #elif defined(SHA256_GCRYPT) #define SHA256_NEEDS_CLONE_HELPER #include "sha256/gcrypt.h" #elif defined(SHA256_OPENSSL) # include <openssl/sha.h> # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 #define SHA256_NEEDS_CLONE_HELPER # include "sha256/openssl.h" # endif #else #include "sha256/block/sha256.h" #endif #ifndef platform_SHA_CTX /* * platform's underlying implementation of SHA-1; could be OpenSSL, * blk_SHA, Apple CommonCrypto, etc... Note that the relevant * SHA-1 header may have already defined platform_SHA_CTX for our * own implementations like block-sha1, so we list * the default for OpenSSL compatible SHA-1 implementations here. */ #define platform_SHA_CTX … #define platform_SHA1_Init … #define platform_SHA1_Update … #define platform_SHA1_Final … #endif #ifndef platform_SHA_CTX_unsafe #define platform_SHA_CTX_unsafe … #define platform_SHA1_Init_unsafe … #define platform_SHA1_Update_unsafe … #define platform_SHA1_Final_unsafe … # ifdef platform_SHA1_Clone #define platform_SHA1_Clone_unsafe … # endif # ifdef SHA1_NEEDS_CLONE_HELPER #define SHA1_NEEDS_CLONE_HELPER_UNSAFE # endif #endif #define git_SHA_CTX … #define git_SHA1_Init … #define git_SHA1_Update … #define git_SHA1_Final … #define git_SHA_CTX_unsafe … #define git_SHA1_Init_unsafe … #define git_SHA1_Update_unsafe … #define git_SHA1_Final_unsafe … #ifdef platform_SHA1_Clone #define git_SHA1_Clone … #endif #ifdef platform_SHA1_Clone_unsafe #define git_SHA1_Clone_unsafe … #endif #ifndef platform_SHA256_CTX #define platform_SHA256_CTX … #define platform_SHA256_Init … #define platform_SHA256_Update … #define platform_SHA256_Final … #endif #define git_SHA256_CTX … #define git_SHA256_Init … #define git_SHA256_Update … #define git_SHA256_Final … #ifdef platform_SHA256_Clone #define git_SHA256_Clone … #endif #ifdef SHA1_MAX_BLOCK_SIZE #include "compat/sha1-chunked.h" #undef git_SHA1_Update #define git_SHA1_Update … #endif #ifndef SHA1_NEEDS_CLONE_HELPER static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src) { … } #endif #ifndef SHA1_NEEDS_CLONE_HELPER_UNSAFE static inline void git_SHA1_Clone_unsafe(git_SHA_CTX_unsafe *dst, const git_SHA_CTX_unsafe *src) { … } #endif #ifndef SHA256_NEEDS_CLONE_HELPER static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src) { … } #endif /* * Note that these constants are suitable for indexing the hash_algos array and * comparing against each other, but are otherwise arbitrary, so they should not * be exposed to the user or serialized to disk. To know whether a * git_hash_algo struct points to some usable hash function, test the format_id * field for being non-zero. Use the name field for user-visible situations and * the format_id field for fixed-length fields on disk. */ /* An unknown hash function. */ #define GIT_HASH_UNKNOWN … /* SHA-1 */ #define GIT_HASH_SHA1 … /* SHA-256 */ #define GIT_HASH_SHA256 … /* Number of algorithms supported (including unknown). */ #define GIT_HASH_NALGOS … /* "sha1", big-endian */ #define GIT_SHA1_FORMAT_ID … /* The length in bytes and in hex digits of an object name (SHA-1 value). */ #define GIT_SHA1_RAWSZ … #define GIT_SHA1_HEXSZ … /* The block size of SHA-1. */ #define GIT_SHA1_BLKSZ … /* "s256", big-endian */ #define GIT_SHA256_FORMAT_ID … /* The length in bytes and in hex digits of an object name (SHA-256 value). */ #define GIT_SHA256_RAWSZ … #define GIT_SHA256_HEXSZ … /* The block size of SHA-256. */ #define GIT_SHA256_BLKSZ … /* The length in byte and in hex digits of the largest possible hash value. */ #define GIT_MAX_RAWSZ … #define GIT_MAX_HEXSZ … /* The largest possible block size for any supported hash. */ #define GIT_MAX_BLKSZ … struct object_id { … }; #define GET_OID_QUIETLY … #define GET_OID_COMMIT … #define GET_OID_COMMITTISH … #define GET_OID_TREE … #define GET_OID_TREEISH … #define GET_OID_BLOB … #define GET_OID_FOLLOW_SYMLINKS … #define GET_OID_RECORD_PATH … #define GET_OID_ONLY_TO_DIE … #define GET_OID_REQUIRE_PATH … #define GET_OID_HASH_ANY … #define GET_OID_DISAMBIGUATORS … enum get_oid_result { … }; #ifdef USE_THE_REPOSITORY_VARIABLE # include "repository.h" #define the_hash_algo … #endif /* A suitably aligned type for stack allocations of hash contexts. */ git_hash_ctx; git_hash_ctx; git_hash_init_fn; git_hash_clone_fn; git_hash_update_fn; git_hash_final_fn; git_hash_final_oid_fn; struct git_hash_algo { … }; extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; /* * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if * the name doesn't match a known algorithm. */ int hash_algo_by_name(const char *name); /* Identical, except based on the format ID. */ int hash_algo_by_id(uint32_t format_id); /* Identical, except based on the length. */ int hash_algo_by_length(int len); /* Identical, except for a pointer to struct git_hash_algo. */ static inline int hash_algo_by_ptr(const struct git_hash_algo *p) { … } const struct object_id *null_oid(void); static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2, const struct git_hash_algo *algop) { … } static inline int hasheq(const unsigned char *sha1, const unsigned char *sha2, const struct git_hash_algo *algop) { … } static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src, const struct git_hash_algo *algop) { … } static inline void hashclr(unsigned char *hash, const struct git_hash_algo *algop) { … } static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2) { … } static inline int oideq(const struct object_id *oid1, const struct object_id *oid2) { … } static inline void oidcpy(struct object_id *dst, const struct object_id *src) { … } static inline void oidread(struct object_id *oid, const unsigned char *hash, const struct git_hash_algo *algop) { … } static inline void oidclr(struct object_id *oid, const struct git_hash_algo *algop) { … } static inline struct object_id *oiddup(const struct object_id *src) { … } static inline void oid_set_algo(struct object_id *oid, const struct git_hash_algo *algop) { … } /* * Converts a cryptographic hash (e.g. SHA-1) into an int-sized hash code * for use in hash tables. Cryptographic hashes are supposed to have * uniform distribution, so in contrast to `memhash()`, this just copies * the first `sizeof(int)` bytes without shuffling any bits. Note that * the results will be different on big-endian and little-endian * platforms, so they should not be stored or transferred over the net. */ static inline unsigned int oidhash(const struct object_id *oid) { … } static inline int is_null_oid(const struct object_id *oid) { … } const char *empty_tree_oid_hex(const struct git_hash_algo *algop); static inline int is_empty_blob_oid(const struct object_id *oid, const struct git_hash_algo *algop) { … } static inline int is_empty_tree_oid(const struct object_id *oid, const struct git_hash_algo *algop) { … } #endif
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