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f18f816c | 1 | #ifndef HASH_H |
2 | #define HASH_H | |
3 | ||
f50e766b | 4 | #include "git-compat-util.h" |
5 | ||
f18f816c | 6 | #if defined(SHA1_PPC) |
7 | #include "ppc/sha1.h" | |
8 | #elif defined(SHA1_APPLE) | |
9 | #include <CommonCrypto/CommonDigest.h> | |
10 | #elif defined(SHA1_OPENSSL) | |
11 | #include <openssl/sha.h> | |
8325e43b | 12 | #elif defined(SHA1_DC) |
36f048c5 | 13 | #include "sha1dc_git.h" |
f18f816c | 14 | #else /* SHA1_BLK */ |
15 | #include "block-sha1/sha1.h" | |
16 | #endif | |
17 | ||
27dc04c5 | 18 | #if defined(SHA256_GCRYPT) |
768e30ea | 19 | #define SHA256_NEEDS_CLONE_HELPER |
27dc04c5 | 20 | #include "sha256/gcrypt.h" |
4b4e2918 | 21 | #elif defined(SHA256_OPENSSL) |
22 | #include <openssl/sha.h> | |
27dc04c5 | 23 | #else |
13eeedb5 | 24 | #include "sha256/block/sha256.h" |
27dc04c5 | 25 | #endif |
13eeedb5 | 26 | |
164e7163 | 27 | #ifndef platform_SHA_CTX |
28 | /* | |
29 | * platform's underlying implementation of SHA-1; could be OpenSSL, | |
b212c0ca | 30 | * blk_SHA, Apple CommonCrypto, etc... Note that the relevant |
31 | * SHA-1 header may have already defined platform_SHA_CTX for our | |
164e7163 | 32 | * own implementations like block-sha1 and ppc-sha1, so we list |
33 | * the default for OpenSSL compatible SHA-1 implementations here. | |
34 | */ | |
35 | #define platform_SHA_CTX SHA_CTX | |
36 | #define platform_SHA1_Init SHA1_Init | |
37 | #define platform_SHA1_Update SHA1_Update | |
38 | #define platform_SHA1_Final SHA1_Final | |
39 | #endif | |
40 | ||
41 | #define git_SHA_CTX platform_SHA_CTX | |
42 | #define git_SHA1_Init platform_SHA1_Init | |
43 | #define git_SHA1_Update platform_SHA1_Update | |
44 | #define git_SHA1_Final platform_SHA1_Final | |
45 | ||
13eeedb5 | 46 | #ifndef platform_SHA256_CTX |
47 | #define platform_SHA256_CTX SHA256_CTX | |
48 | #define platform_SHA256_Init SHA256_Init | |
49 | #define platform_SHA256_Update SHA256_Update | |
50 | #define platform_SHA256_Final SHA256_Final | |
51 | #endif | |
52 | ||
53 | #define git_SHA256_CTX platform_SHA256_CTX | |
54 | #define git_SHA256_Init platform_SHA256_Init | |
55 | #define git_SHA256_Update platform_SHA256_Update | |
56 | #define git_SHA256_Final platform_SHA256_Final | |
57 | ||
768e30ea | 58 | #ifdef platform_SHA256_Clone |
59 | #define git_SHA256_Clone platform_SHA256_Clone | |
60 | #endif | |
61 | ||
164e7163 | 62 | #ifdef SHA1_MAX_BLOCK_SIZE |
63 | #include "compat/sha1-chunked.h" | |
64 | #undef git_SHA1_Update | |
65 | #define git_SHA1_Update git_SHA1_Update_Chunked | |
66 | #endif | |
67 | ||
768e30ea | 68 | static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src) |
69 | { | |
70 | memcpy(dst, src, sizeof(*dst)); | |
71 | } | |
72 | ||
73 | #ifndef SHA256_NEEDS_CLONE_HELPER | |
74 | static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src) | |
75 | { | |
76 | memcpy(dst, src, sizeof(*dst)); | |
77 | } | |
78 | #endif | |
79 | ||
f50e766b | 80 | /* |
81 | * Note that these constants are suitable for indexing the hash_algos array and | |
82 | * comparing against each other, but are otherwise arbitrary, so they should not | |
83 | * be exposed to the user or serialized to disk. To know whether a | |
84 | * git_hash_algo struct points to some usable hash function, test the format_id | |
85 | * field for being non-zero. Use the name field for user-visible situations and | |
86 | * the format_id field for fixed-length fields on disk. | |
87 | */ | |
88 | /* An unknown hash function. */ | |
89 | #define GIT_HASH_UNKNOWN 0 | |
90 | /* SHA-1 */ | |
91 | #define GIT_HASH_SHA1 1 | |
13eeedb5 | 92 | /* SHA-256 */ |
93 | #define GIT_HASH_SHA256 2 | |
f50e766b | 94 | /* Number of algorithms supported (including unknown). */ |
13eeedb5 | 95 | #define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1) |
f50e766b | 96 | |
ac73cedf | 97 | /* A suitably aligned type for stack allocations of hash contexts. */ |
98 | union git_hash_ctx { | |
99 | git_SHA_CTX sha1; | |
13eeedb5 | 100 | git_SHA256_CTX sha256; |
ac73cedf | 101 | }; |
102 | typedef union git_hash_ctx git_hash_ctx; | |
103 | ||
104 | typedef void (*git_hash_init_fn)(git_hash_ctx *ctx); | |
768e30ea | 105 | typedef void (*git_hash_clone_fn)(git_hash_ctx *dst, const git_hash_ctx *src); |
ac73cedf | 106 | typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len); |
107 | typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx); | |
f50e766b | 108 | |
109 | struct git_hash_algo { | |
110 | /* | |
111 | * The name of the algorithm, as appears in the config file and in | |
112 | * messages. | |
113 | */ | |
114 | const char *name; | |
115 | ||
116 | /* A four-byte version identifier, used in pack indices. */ | |
117 | uint32_t format_id; | |
118 | ||
f50e766b | 119 | /* The length of the hash in binary. */ |
120 | size_t rawsz; | |
121 | ||
122 | /* The length of the hash in hex characters. */ | |
123 | size_t hexsz; | |
124 | ||
a2ce0a75 | 125 | /* The block size of the hash. */ |
126 | size_t blksz; | |
127 | ||
f50e766b | 128 | /* The hash initialization function. */ |
129 | git_hash_init_fn init_fn; | |
130 | ||
768e30ea | 131 | /* The hash context cloning function. */ |
132 | git_hash_clone_fn clone_fn; | |
133 | ||
f50e766b | 134 | /* The hash update function. */ |
135 | git_hash_update_fn update_fn; | |
136 | ||
137 | /* The hash finalization function. */ | |
138 | git_hash_final_fn final_fn; | |
139 | ||
140 | /* The OID of the empty tree. */ | |
141 | const struct object_id *empty_tree; | |
142 | ||
143 | /* The OID of the empty blob. */ | |
144 | const struct object_id *empty_blob; | |
145 | }; | |
146 | extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; | |
147 | ||
2f90b9d9 | 148 | /* |
149 | * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if | |
150 | * the name doesn't match a known algorithm. | |
151 | */ | |
152 | int hash_algo_by_name(const char *name); | |
153 | /* Identical, except based on the format ID. */ | |
154 | int hash_algo_by_id(uint32_t format_id); | |
95399788 | 155 | /* Identical, except based on the length. */ |
156 | int hash_algo_by_length(int len); | |
2f90b9d9 | 157 | /* Identical, except for a pointer to struct git_hash_algo. */ |
158 | static inline int hash_algo_by_ptr(const struct git_hash_algo *p) | |
159 | { | |
160 | return p - hash_algos; | |
161 | } | |
162 | ||
c0566d78 JK |
163 | /* The length in bytes and in hex digits of an object name (SHA-1 value). */ |
164 | #define GIT_SHA1_RAWSZ 20 | |
165 | #define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) | |
166 | /* The block size of SHA-1. */ | |
167 | #define GIT_SHA1_BLKSZ 64 | |
168 | ||
169 | /* The length in bytes and in hex digits of an object name (SHA-256 value). */ | |
170 | #define GIT_SHA256_RAWSZ 32 | |
171 | #define GIT_SHA256_HEXSZ (2 * GIT_SHA256_RAWSZ) | |
172 | /* The block size of SHA-256. */ | |
173 | #define GIT_SHA256_BLKSZ 64 | |
174 | ||
175 | /* The length in byte and in hex digits of the largest possible hash value. */ | |
176 | #define GIT_MAX_RAWSZ GIT_SHA256_RAWSZ | |
177 | #define GIT_MAX_HEXSZ GIT_SHA256_HEXSZ | |
178 | /* The largest possible block size for any supported hash. */ | |
179 | #define GIT_MAX_BLKSZ GIT_SHA256_BLKSZ | |
180 | ||
181 | struct object_id { | |
182 | unsigned char hash[GIT_MAX_RAWSZ]; | |
183 | }; | |
184 | ||
185 | #define the_hash_algo the_repository->hash_algo | |
186 | ||
f18f816c | 187 | #endif |