| #ifndef HASH_H |
| #define HASH_H |
| |
| #include "git-compat-util.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" |
| #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 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 |
| #endif |
| |
| #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 |
| |
| #ifdef SHA1_MAX_BLOCK_SIZE |
| #include "compat/sha1-chunked.h" |
| #undef git_SHA1_Update |
| #define git_SHA1_Update git_SHA1_Update_Chunked |
| #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 0 |
| /* SHA-1 */ |
| #define GIT_HASH_SHA1 1 |
| /* Number of algorithms supported (including unknown). */ |
| #define GIT_HASH_NALGOS (GIT_HASH_SHA1 + 1) |
| |
| /* A suitably aligned type for stack allocations of hash contexts. */ |
| union git_hash_ctx { |
| git_SHA_CTX sha1; |
| }; |
| typedef union git_hash_ctx git_hash_ctx; |
| |
| typedef void (*git_hash_init_fn)(git_hash_ctx *ctx); |
| 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 hash initialization function. */ |
| git_hash_init_fn init_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]; |
| |
| #endif |