blob: 3fb0c3d4005aeb2267625e365a83e6de608efd28 [file] [log] [blame]
#ifndef HASH_H
#define HASH_H
#include "git-compat-util.h"
#include "repository.h"
#if defined(SHA1_PPC)
#include "ppc/sha1.h"
#elif defined(SHA1_APPLE)
#include <CommonCrypto/CommonDigest.h>
#elif defined(SHA1_OPENSSL)
#include <openssl/sha.h>
#elif defined(SHA1_DC)
#include "sha1dc_git.h"
#else /* SHA1_BLK */
#include "block-sha1/sha1.h"
#if defined(SHA256_GCRYPT)
#include "sha256/gcrypt.h"
#elif defined(SHA256_OPENSSL)
#include <openssl/sha.h>
#include "sha256/block/sha256.h"
#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 and ppc-sha1, so we list
* the default for OpenSSL compatible SHA-1 implementations here.
#define platform_SHA_CTX SHA_CTX
#define platform_SHA1_Init SHA1_Init
#define platform_SHA1_Update SHA1_Update
#define platform_SHA1_Final SHA1_Final
#define git_SHA_CTX platform_SHA_CTX
#define git_SHA1_Init platform_SHA1_Init
#define git_SHA1_Update platform_SHA1_Update
#define git_SHA1_Final platform_SHA1_Final
#ifndef platform_SHA256_CTX
#define platform_SHA256_CTX SHA256_CTX
#define platform_SHA256_Init SHA256_Init
#define platform_SHA256_Update SHA256_Update
#define platform_SHA256_Final SHA256_Final
#define git_SHA256_CTX platform_SHA256_CTX
#define git_SHA256_Init platform_SHA256_Init
#define git_SHA256_Update platform_SHA256_Update
#define git_SHA256_Final platform_SHA256_Final
#ifdef platform_SHA256_Clone
#define git_SHA256_Clone platform_SHA256_Clone
#include "compat/sha1-chunked.h"
#undef git_SHA1_Update
#define git_SHA1_Update git_SHA1_Update_Chunked
static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src)
memcpy(dst, src, sizeof(*dst));
static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src)
memcpy(dst, src, sizeof(*dst));
* 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. */
/* SHA-1 */
#define GIT_HASH_SHA1 1
/* SHA-256 */
#define GIT_HASH_SHA256 2
/* Number of algorithms supported (including unknown). */
/* A suitably aligned type for stack allocations of hash contexts. */
union git_hash_ctx {
git_SHA_CTX sha1;
git_SHA256_CTX sha256;
typedef union git_hash_ctx git_hash_ctx;
typedef void (*git_hash_init_fn)(git_hash_ctx *ctx);
typedef void (*git_hash_clone_fn)(git_hash_ctx *dst, const git_hash_ctx *src);
typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len);
typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx);
struct git_hash_algo {
* The name of the algorithm, as appears in the config file and in
* messages.
const char *name;
/* A four-byte version identifier, used in pack indices. */
uint32_t format_id;
/* The length of the hash in binary. */
size_t rawsz;
/* The length of the hash in hex characters. */
size_t hexsz;
/* The block size of the hash. */
size_t blksz;
/* The hash initialization function. */
git_hash_init_fn init_fn;
/* The hash context cloning function. */
git_hash_clone_fn clone_fn;
/* The hash update function. */
git_hash_update_fn update_fn;
/* The hash finalization function. */
git_hash_final_fn final_fn;
/* The OID of the empty tree. */
const struct object_id *empty_tree;
/* The OID of the empty blob. */
const struct object_id *empty_blob;
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)
return p - hash_algos;
/* The length in bytes and in hex digits of an object name (SHA-1 value). */
#define GIT_SHA1_RAWSZ 20
/* The block size of SHA-1. */
#define GIT_SHA1_BLKSZ 64
/* The length in bytes and in hex digits of an object name (SHA-256 value). */
#define GIT_SHA256_RAWSZ 32
#define GIT_SHA256_HEXSZ (2 * GIT_SHA256_RAWSZ)
/* The block size of SHA-256. */
#define GIT_SHA256_BLKSZ 64
/* The length in byte and in hex digits of the largest possible hash value. */
/* The largest possible block size for any supported hash. */
struct object_id {
unsigned char hash[GIT_MAX_RAWSZ];
#define the_hash_algo the_repository->hash_algo
extern const struct object_id null_oid;
static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
* Teach the compiler that there are only two possibilities of hash size
* here, so that it can optimize for this case as much as possible.
if (the_hash_algo->rawsz == GIT_MAX_RAWSZ)
return memcmp(sha1, sha2, GIT_MAX_RAWSZ);
return memcmp(sha1, sha2, GIT_SHA1_RAWSZ);
static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2)
return hashcmp(oid1->hash, oid2->hash);
static inline int hasheq(const unsigned char *sha1, const unsigned char *sha2)
* We write this here instead of deferring to hashcmp so that the
* compiler can properly inline it and avoid calling memcmp.
if (the_hash_algo->rawsz == GIT_MAX_RAWSZ)
return !memcmp(sha1, sha2, GIT_MAX_RAWSZ);
return !memcmp(sha1, sha2, GIT_SHA1_RAWSZ);
static inline int oideq(const struct object_id *oid1, const struct object_id *oid2)
return hasheq(oid1->hash, oid2->hash);
static inline int is_null_oid(const struct object_id *oid)
return oideq(oid, &null_oid);
static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
memcpy(sha_dst, sha_src, the_hash_algo->rawsz);
static inline void oidcpy(struct object_id *dst, const struct object_id *src)
memcpy(dst->hash, src->hash, GIT_MAX_RAWSZ);
static inline struct object_id *oiddup(const struct object_id *src)
struct object_id *dst = xmalloc(sizeof(struct object_id));
oidcpy(dst, src);
return dst;
static inline void hashclr(unsigned char *hash)
memset(hash, 0, the_hash_algo->rawsz);
static inline void oidclr(struct object_id *oid)
memset(oid->hash, 0, GIT_MAX_RAWSZ);
static inline void oidread(struct object_id *oid, const unsigned char *hash)
memcpy(oid->hash, hash, the_hash_algo->rawsz);
static inline int is_empty_blob_sha1(const unsigned char *sha1)
return hasheq(sha1, the_hash_algo->empty_blob->hash);
static inline int is_empty_blob_oid(const struct object_id *oid)
return oideq(oid, the_hash_algo->empty_blob);
static inline int is_empty_tree_sha1(const unsigned char *sha1)
return hasheq(sha1, the_hash_algo->empty_tree->hash);
static inline int is_empty_tree_oid(const struct object_id *oid)
return oideq(oid, the_hash_algo->empty_tree);
const char *empty_tree_oid_hex(void);
const char *empty_blob_oid_hex(void);