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Commit | Line | Data |
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d6fb0924 | 1 | /* |
359fc2d2 | 2 | * Copyright (C) the libgit2 contributors. All rights reserved. |
d6fb0924 ET |
3 | * |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | ||
8 | #include "common.h" | |
9 | #include "global.h" | |
10 | #include "hash.h" | |
11 | #include "hash/hash_win32.h" | |
12 | ||
13 | #include <wincrypt.h> | |
14 | #include <strsafe.h> | |
15 | ||
7ebefd22 ET |
16 | static struct git_hash_prov hash_prov = {0}; |
17 | ||
18 | /* Hash initialization */ | |
19 | ||
d6fb0924 | 20 | /* Initialize CNG, if available */ |
7ebefd22 | 21 | GIT_INLINE(int) hash_cng_prov_init(void) |
d6fb0924 | 22 | { |
d6fb0924 ET |
23 | char dll_path[MAX_PATH]; |
24 | DWORD dll_path_len, size_len; | |
25 | ||
26 | /* Only use CNG on Windows 2008 / Vista SP1 or better (Windows 6.0 SP1) */ | |
1ff3a094 | 27 | if (!git_has_win32_version(6, 0, 1)) |
d6fb0924 ET |
28 | return -1; |
29 | ||
30 | /* Load bcrypt.dll explicitly from the system directory */ | |
43095341 RB |
31 | if ((dll_path_len = GetSystemDirectory(dll_path, MAX_PATH)) == 0 || |
32 | dll_path_len > MAX_PATH || | |
d6fb0924 ET |
33 | StringCchCat(dll_path, MAX_PATH, "\\") < 0 || |
34 | StringCchCat(dll_path, MAX_PATH, GIT_HASH_CNG_DLL_NAME) < 0 || | |
7ebefd22 | 35 | (hash_prov.prov.cng.dll = LoadLibrary(dll_path)) == NULL) |
d6fb0924 ET |
36 | return -1; |
37 | ||
38 | /* Load the function addresses */ | |
7ebefd22 ET |
39 | if ((hash_prov.prov.cng.open_algorithm_provider = (hash_win32_cng_open_algorithm_provider_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptOpenAlgorithmProvider")) == NULL || |
40 | (hash_prov.prov.cng.get_property = (hash_win32_cng_get_property_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptGetProperty")) == NULL || | |
41 | (hash_prov.prov.cng.create_hash = (hash_win32_cng_create_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptCreateHash")) == NULL || | |
42 | (hash_prov.prov.cng.finish_hash = (hash_win32_cng_finish_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptFinishHash")) == NULL || | |
43 | (hash_prov.prov.cng.hash_data = (hash_win32_cng_hash_data_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptHashData")) == NULL || | |
44 | (hash_prov.prov.cng.destroy_hash = (hash_win32_cng_destroy_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptDestroyHash")) == NULL || | |
45 | (hash_prov.prov.cng.close_algorithm_provider = (hash_win32_cng_close_algorithm_provider_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptCloseAlgorithmProvider")) == NULL) { | |
46 | FreeLibrary(hash_prov.prov.cng.dll); | |
d6fb0924 ET |
47 | return -1; |
48 | } | |
49 | ||
50 | /* Load the SHA1 algorithm */ | |
7ebefd22 ET |
51 | if (hash_prov.prov.cng.open_algorithm_provider(&hash_prov.prov.cng.handle, GIT_HASH_CNG_HASH_TYPE, NULL, GIT_HASH_CNG_HASH_REUSABLE) < 0) { |
52 | FreeLibrary(hash_prov.prov.cng.dll); | |
d6fb0924 ET |
53 | return -1; |
54 | } | |
55 | ||
56 | /* Get storage space for the hash object */ | |
7ebefd22 ET |
57 | if (hash_prov.prov.cng.get_property(hash_prov.prov.cng.handle, GIT_HASH_CNG_HASH_OBJECT_LEN, (PBYTE)&hash_prov.prov.cng.hash_object_size, sizeof(DWORD), &size_len, 0) < 0) { |
58 | hash_prov.prov.cng.close_algorithm_provider(hash_prov.prov.cng.handle, 0); | |
59 | FreeLibrary(hash_prov.prov.cng.dll); | |
d6fb0924 ET |
60 | return -1; |
61 | } | |
62 | ||
7ebefd22 | 63 | hash_prov.type = CNG; |
d6fb0924 ET |
64 | return 0; |
65 | } | |
66 | ||
a8527429 ET |
67 | GIT_INLINE(void) hash_cng_prov_shutdown(void) |
68 | { | |
69 | hash_prov.prov.cng.close_algorithm_provider(hash_prov.prov.cng.handle, 0); | |
70 | FreeLibrary(hash_prov.prov.cng.dll); | |
71 | ||
72 | hash_prov.type = INVALID; | |
73 | } | |
74 | ||
d6fb0924 | 75 | /* Initialize CryptoAPI */ |
7ebefd22 | 76 | GIT_INLINE(int) hash_cryptoapi_prov_init() |
d6fb0924 | 77 | { |
7ebefd22 | 78 | if (!CryptAcquireContext(&hash_prov.prov.cryptoapi.handle, NULL, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) |
d6fb0924 ET |
79 | return -1; |
80 | ||
7ebefd22 | 81 | hash_prov.type = CRYPTOAPI; |
d6fb0924 ET |
82 | return 0; |
83 | } | |
84 | ||
a8527429 ET |
85 | GIT_INLINE(void) hash_cryptoapi_prov_shutdown(void) |
86 | { | |
87 | CryptReleaseContext(hash_prov.prov.cryptoapi.handle, 0); | |
88 | ||
89 | hash_prov.type = INVALID; | |
90 | } | |
91 | ||
7ebefd22 | 92 | int git_hash_global_init() |
d6fb0924 ET |
93 | { |
94 | int error = 0; | |
95 | ||
7ebefd22 ET |
96 | if (hash_prov.type != INVALID) |
97 | return 0; | |
d6fb0924 | 98 | |
7ebefd22 ET |
99 | if ((error = hash_cng_prov_init()) < 0) |
100 | error = hash_cryptoapi_prov_init(); | |
d6fb0924 | 101 | |
7ebefd22 | 102 | return error; |
d6fb0924 ET |
103 | } |
104 | ||
a8527429 ET |
105 | void git_hash_global_shutdown() |
106 | { | |
107 | if (hash_prov.type == CNG) | |
108 | hash_cng_prov_shutdown(); | |
109 | else if(hash_prov.type == CRYPTOAPI) | |
110 | hash_cryptoapi_prov_shutdown(); | |
111 | } | |
112 | ||
d6fb0924 ET |
113 | /* CryptoAPI: available in Windows XP and newer */ |
114 | ||
7ebefd22 | 115 | GIT_INLINE(int) hash_ctx_cryptoapi_init(git_hash_ctx *ctx) |
d6fb0924 | 116 | { |
d6fb0924 | 117 | ctx->type = CRYPTOAPI; |
7ebefd22 | 118 | ctx->prov = &hash_prov; |
d6fb0924 | 119 | |
8005c6d4 | 120 | return git_hash_init(ctx); |
d6fb0924 ET |
121 | } |
122 | ||
123 | GIT_INLINE(int) hash_cryptoapi_init(git_hash_ctx *ctx) | |
124 | { | |
125 | if (ctx->ctx.cryptoapi.valid) | |
126 | CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); | |
127 | ||
128 | if (!CryptCreateHash(ctx->prov->prov.cryptoapi.handle, CALG_SHA1, 0, 0, &ctx->ctx.cryptoapi.hash_handle)) { | |
129 | ctx->ctx.cryptoapi.valid = 0; | |
130 | return -1; | |
131 | } | |
132 | ||
133 | ctx->ctx.cryptoapi.valid = 1; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | GIT_INLINE(int) hash_cryptoapi_update(git_hash_ctx *ctx, const void *data, size_t len) | |
138 | { | |
139 | assert(ctx->ctx.cryptoapi.valid); | |
140 | ||
a8122b5d | 141 | if (!CryptHashData(ctx->ctx.cryptoapi.hash_handle, (const BYTE *)data, (DWORD)len, 0)) |
d6fb0924 ET |
142 | return -1; |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | GIT_INLINE(int) hash_cryptoapi_final(git_oid *out, git_hash_ctx *ctx) | |
148 | { | |
149 | DWORD len = 20; | |
150 | int error = 0; | |
151 | ||
152 | assert(ctx->ctx.cryptoapi.valid); | |
153 | ||
154 | if (!CryptGetHashParam(ctx->ctx.cryptoapi.hash_handle, HP_HASHVAL, out->id, &len, 0)) | |
155 | error = -1; | |
156 | ||
157 | CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); | |
158 | ctx->ctx.cryptoapi.valid = 0; | |
159 | ||
160 | return error; | |
161 | } | |
162 | ||
603bee07 | 163 | GIT_INLINE(void) hash_ctx_cryptoapi_cleanup(git_hash_ctx *ctx) |
d6fb0924 ET |
164 | { |
165 | if (ctx->ctx.cryptoapi.valid) | |
166 | CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); | |
167 | } | |
168 | ||
169 | /* CNG: Available in Windows Server 2008 and newer */ | |
170 | ||
7ebefd22 | 171 | GIT_INLINE(int) hash_ctx_cng_init(git_hash_ctx *ctx) |
d6fb0924 | 172 | { |
7ebefd22 | 173 | if ((ctx->ctx.cng.hash_object = git__malloc(hash_prov.prov.cng.hash_object_size)) == NULL) |
603bee07 | 174 | return -1; |
d6fb0924 | 175 | |
7ebefd22 | 176 | if (hash_prov.prov.cng.create_hash(hash_prov.prov.cng.handle, &ctx->ctx.cng.hash_handle, ctx->ctx.cng.hash_object, hash_prov.prov.cng.hash_object_size, NULL, 0, 0) < 0) { |
d6fb0924 | 177 | git__free(ctx->ctx.cng.hash_object); |
603bee07 | 178 | return -1; |
d6fb0924 ET |
179 | } |
180 | ||
181 | ctx->type = CNG; | |
7ebefd22 | 182 | ctx->prov = &hash_prov; |
d6fb0924 | 183 | |
603bee07 | 184 | return 0; |
d6fb0924 ET |
185 | } |
186 | ||
187 | GIT_INLINE(int) hash_cng_init(git_hash_ctx *ctx) | |
188 | { | |
189 | BYTE hash[GIT_OID_RAWSZ]; | |
190 | ||
191 | if (!ctx->ctx.cng.updated) | |
192 | return 0; | |
193 | ||
194 | /* CNG needs to be finished to restart */ | |
195 | if (ctx->prov->prov.cng.finish_hash(ctx->ctx.cng.hash_handle, hash, GIT_OID_RAWSZ, 0) < 0) | |
196 | return -1; | |
197 | ||
198 | ctx->ctx.cng.updated = 0; | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | GIT_INLINE(int) hash_cng_update(git_hash_ctx *ctx, const void *data, size_t len) | |
204 | { | |
a8122b5d | 205 | if (ctx->prov->prov.cng.hash_data(ctx->ctx.cng.hash_handle, (PBYTE)data, (ULONG)len, 0) < 0) |
d6fb0924 ET |
206 | return -1; |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | GIT_INLINE(int) hash_cng_final(git_oid *out, git_hash_ctx *ctx) | |
212 | { | |
213 | if (ctx->prov->prov.cng.finish_hash(ctx->ctx.cng.hash_handle, out->id, GIT_OID_RAWSZ, 0) < 0) | |
214 | return -1; | |
215 | ||
216 | ctx->ctx.cng.updated = 0; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
603bee07 | 221 | GIT_INLINE(void) hash_ctx_cng_cleanup(git_hash_ctx *ctx) |
d6fb0924 ET |
222 | { |
223 | ctx->prov->prov.cng.destroy_hash(ctx->ctx.cng.hash_handle); | |
224 | git__free(ctx->ctx.cng.hash_object); | |
225 | } | |
226 | ||
227 | /* Indirection between CryptoAPI and CNG */ | |
228 | ||
603bee07 | 229 | int git_hash_ctx_init(git_hash_ctx *ctx) |
d6fb0924 | 230 | { |
7ebefd22 | 231 | int error = 0; |
d6fb0924 | 232 | |
7ebefd22 | 233 | assert(ctx); |
d6fb0924 | 234 | |
7ebefd22 ET |
235 | /* |
236 | * When compiled with GIT_THREADS, the global hash_prov data is | |
237 | * initialized with git_threads_init. Otherwise, it must be initialized | |
238 | * at first use. | |
239 | */ | |
240 | if (hash_prov.type == INVALID && (error = git_hash_global_init()) < 0) | |
241 | return error; | |
d6fb0924 | 242 | |
7ebefd22 | 243 | memset(ctx, 0x0, sizeof(git_hash_ctx)); |
d6fb0924 | 244 | |
7ebefd22 | 245 | return (hash_prov.type == CNG) ? hash_ctx_cng_init(ctx) : hash_ctx_cryptoapi_init(ctx); |
d6fb0924 ET |
246 | } |
247 | ||
8005c6d4 | 248 | int git_hash_init(git_hash_ctx *ctx) |
d6fb0924 ET |
249 | { |
250 | assert(ctx && ctx->type); | |
251 | return (ctx->type == CNG) ? hash_cng_init(ctx) : hash_cryptoapi_init(ctx); | |
252 | } | |
253 | ||
254 | int git_hash_update(git_hash_ctx *ctx, const void *data, size_t len) | |
255 | { | |
256 | assert(ctx && ctx->type); | |
257 | return (ctx->type == CNG) ? hash_cng_update(ctx, data, len) : hash_cryptoapi_update(ctx, data, len); | |
258 | } | |
259 | ||
260 | int git_hash_final(git_oid *out, git_hash_ctx *ctx) | |
261 | { | |
262 | assert(ctx && ctx->type); | |
263 | return (ctx->type == CNG) ? hash_cng_final(out, ctx) : hash_cryptoapi_final(out, ctx); | |
264 | } | |
265 | ||
603bee07 | 266 | void git_hash_ctx_cleanup(git_hash_ctx *ctx) |
d6fb0924 | 267 | { |
603bee07 | 268 | assert(ctx); |
d6fb0924 ET |
269 | |
270 | if (ctx->type == CNG) | |
603bee07 ET |
271 | hash_ctx_cng_cleanup(ctx); |
272 | else if(ctx->type == CRYPTOAPI) | |
273 | hash_ctx_cryptoapi_cleanup(ctx); | |
d6fb0924 | 274 | } |