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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) |
19 | #include "sha256/gcrypt.h" | |
20 | #else | |
13eeedb5 | 21 | #include "sha256/block/sha256.h" |
27dc04c5 | 22 | #endif |
13eeedb5 | 23 | |
164e7163 | 24 | #ifndef platform_SHA_CTX |
25 | /* | |
26 | * platform's underlying implementation of SHA-1; could be OpenSSL, | |
b212c0ca | 27 | * blk_SHA, Apple CommonCrypto, etc... Note that the relevant |
28 | * SHA-1 header may have already defined platform_SHA_CTX for our | |
164e7163 | 29 | * own implementations like block-sha1 and ppc-sha1, so we list |
30 | * the default for OpenSSL compatible SHA-1 implementations here. | |
31 | */ | |
32 | #define platform_SHA_CTX SHA_CTX | |
33 | #define platform_SHA1_Init SHA1_Init | |
34 | #define platform_SHA1_Update SHA1_Update | |
35 | #define platform_SHA1_Final SHA1_Final | |
36 | #endif | |
37 | ||
38 | #define git_SHA_CTX platform_SHA_CTX | |
39 | #define git_SHA1_Init platform_SHA1_Init | |
40 | #define git_SHA1_Update platform_SHA1_Update | |
41 | #define git_SHA1_Final platform_SHA1_Final | |
42 | ||
13eeedb5 | 43 | #ifndef platform_SHA256_CTX |
44 | #define platform_SHA256_CTX SHA256_CTX | |
45 | #define platform_SHA256_Init SHA256_Init | |
46 | #define platform_SHA256_Update SHA256_Update | |
47 | #define platform_SHA256_Final SHA256_Final | |
48 | #endif | |
49 | ||
50 | #define git_SHA256_CTX platform_SHA256_CTX | |
51 | #define git_SHA256_Init platform_SHA256_Init | |
52 | #define git_SHA256_Update platform_SHA256_Update | |
53 | #define git_SHA256_Final platform_SHA256_Final | |
54 | ||
164e7163 | 55 | #ifdef SHA1_MAX_BLOCK_SIZE |
56 | #include "compat/sha1-chunked.h" | |
57 | #undef git_SHA1_Update | |
58 | #define git_SHA1_Update git_SHA1_Update_Chunked | |
59 | #endif | |
60 | ||
f50e766b | 61 | /* |
62 | * Note that these constants are suitable for indexing the hash_algos array and | |
63 | * comparing against each other, but are otherwise arbitrary, so they should not | |
64 | * be exposed to the user or serialized to disk. To know whether a | |
65 | * git_hash_algo struct points to some usable hash function, test the format_id | |
66 | * field for being non-zero. Use the name field for user-visible situations and | |
67 | * the format_id field for fixed-length fields on disk. | |
68 | */ | |
69 | /* An unknown hash function. */ | |
70 | #define GIT_HASH_UNKNOWN 0 | |
71 | /* SHA-1 */ | |
72 | #define GIT_HASH_SHA1 1 | |
13eeedb5 | 73 | /* SHA-256 */ |
74 | #define GIT_HASH_SHA256 2 | |
f50e766b | 75 | /* Number of algorithms supported (including unknown). */ |
13eeedb5 | 76 | #define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1) |
f50e766b | 77 | |
ac73cedf | 78 | /* A suitably aligned type for stack allocations of hash contexts. */ |
79 | union git_hash_ctx { | |
80 | git_SHA_CTX sha1; | |
13eeedb5 | 81 | git_SHA256_CTX sha256; |
ac73cedf | 82 | }; |
83 | typedef union git_hash_ctx git_hash_ctx; | |
84 | ||
85 | typedef void (*git_hash_init_fn)(git_hash_ctx *ctx); | |
86 | typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len); | |
87 | typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx); | |
f50e766b | 88 | |
89 | struct git_hash_algo { | |
90 | /* | |
91 | * The name of the algorithm, as appears in the config file and in | |
92 | * messages. | |
93 | */ | |
94 | const char *name; | |
95 | ||
96 | /* A four-byte version identifier, used in pack indices. */ | |
97 | uint32_t format_id; | |
98 | ||
f50e766b | 99 | /* The length of the hash in binary. */ |
100 | size_t rawsz; | |
101 | ||
102 | /* The length of the hash in hex characters. */ | |
103 | size_t hexsz; | |
104 | ||
a2ce0a75 | 105 | /* The block size of the hash. */ |
106 | size_t blksz; | |
107 | ||
f50e766b | 108 | /* The hash initialization function. */ |
109 | git_hash_init_fn init_fn; | |
110 | ||
111 | /* The hash update function. */ | |
112 | git_hash_update_fn update_fn; | |
113 | ||
114 | /* The hash finalization function. */ | |
115 | git_hash_final_fn final_fn; | |
116 | ||
117 | /* The OID of the empty tree. */ | |
118 | const struct object_id *empty_tree; | |
119 | ||
120 | /* The OID of the empty blob. */ | |
121 | const struct object_id *empty_blob; | |
122 | }; | |
123 | extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; | |
124 | ||
2f90b9d9 | 125 | /* |
126 | * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if | |
127 | * the name doesn't match a known algorithm. | |
128 | */ | |
129 | int hash_algo_by_name(const char *name); | |
130 | /* Identical, except based on the format ID. */ | |
131 | int hash_algo_by_id(uint32_t format_id); | |
132 | /* Identical, except for a pointer to struct git_hash_algo. */ | |
133 | static inline int hash_algo_by_ptr(const struct git_hash_algo *p) | |
134 | { | |
135 | return p - hash_algos; | |
136 | } | |
137 | ||
f18f816c | 138 | #endif |