thodg/libgit2/src/hash/hash_win32.c
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Hash : 799e22ea
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Date : 2014-10-23T17:34:41
Rename git_threads_ to git_libgit2_ This describes their purpose better, as we now initialize ssl and some other global stuff in there. Calling the init function is not something which has been optional for a while now.
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src/hash/hash_win32.c
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/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #include "common.h" #include "global.h" #include "hash.h" #include "hash/hash_win32.h" #include <wincrypt.h> #include <strsafe.h> static struct git_hash_prov hash_prov = {0}; /* Hash initialization */ /* Initialize CNG, if available */ GIT_INLINE(int) hash_cng_prov_init(void) { char dll_path[MAX_PATH]; DWORD dll_path_len, size_len; /* Only use CNG on Windows 2008 / Vista SP1 or better (Windows 6.0 SP1) */ if (!git_has_win32_version(6, 0, 1)) return -1; /* Load bcrypt.dll explicitly from the system directory */ if ((dll_path_len = GetSystemDirectory(dll_path, MAX_PATH)) == 0 || dll_path_len > MAX_PATH || StringCchCat(dll_path, MAX_PATH, "\\") < 0 || StringCchCat(dll_path, MAX_PATH, GIT_HASH_CNG_DLL_NAME) < 0 || (hash_prov.prov.cng.dll = LoadLibrary(dll_path)) == NULL) return -1; /* Load the function addresses */ if ((hash_prov.prov.cng.open_algorithm_provider = (hash_win32_cng_open_algorithm_provider_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptOpenAlgorithmProvider")) == NULL || (hash_prov.prov.cng.get_property = (hash_win32_cng_get_property_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptGetProperty")) == NULL || (hash_prov.prov.cng.create_hash = (hash_win32_cng_create_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptCreateHash")) == NULL || (hash_prov.prov.cng.finish_hash = (hash_win32_cng_finish_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptFinishHash")) == NULL || (hash_prov.prov.cng.hash_data = (hash_win32_cng_hash_data_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptHashData")) == NULL || (hash_prov.prov.cng.destroy_hash = (hash_win32_cng_destroy_hash_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptDestroyHash")) == NULL || (hash_prov.prov.cng.close_algorithm_provider = (hash_win32_cng_close_algorithm_provider_fn)GetProcAddress(hash_prov.prov.cng.dll, "BCryptCloseAlgorithmProvider")) == NULL) { FreeLibrary(hash_prov.prov.cng.dll); return -1; } /* Load the SHA1 algorithm */ 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) { FreeLibrary(hash_prov.prov.cng.dll); return -1; } /* Get storage space for the hash object */ 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) { hash_prov.prov.cng.close_algorithm_provider(hash_prov.prov.cng.handle, 0); FreeLibrary(hash_prov.prov.cng.dll); return -1; } hash_prov.type = CNG; return 0; } GIT_INLINE(void) hash_cng_prov_shutdown(void) { hash_prov.prov.cng.close_algorithm_provider(hash_prov.prov.cng.handle, 0); FreeLibrary(hash_prov.prov.cng.dll); hash_prov.type = INVALID; } /* Initialize CryptoAPI */ GIT_INLINE(int) hash_cryptoapi_prov_init() { if (!CryptAcquireContext(&hash_prov.prov.cryptoapi.handle, NULL, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) return -1; hash_prov.type = CRYPTOAPI; return 0; } GIT_INLINE(void) hash_cryptoapi_prov_shutdown(void) { CryptReleaseContext(hash_prov.prov.cryptoapi.handle, 0); hash_prov.type = INVALID; } static void git_hash_global_shutdown(void) { if (hash_prov.type == CNG) hash_cng_prov_shutdown(); else if(hash_prov.type == CRYPTOAPI) hash_cryptoapi_prov_shutdown(); } int git_hash_global_init(void) { int error = 0; if (hash_prov.type != INVALID) return 0; if ((error = hash_cng_prov_init()) < 0) error = hash_cryptoapi_prov_init(); git__on_shutdown(git_hash_global_shutdown); return error; } /* CryptoAPI: available in Windows XP and newer */ GIT_INLINE(int) hash_ctx_cryptoapi_init(git_hash_ctx *ctx) { ctx->type = CRYPTOAPI; ctx->prov = &hash_prov; return git_hash_init(ctx); } GIT_INLINE(int) hash_cryptoapi_init(git_hash_ctx *ctx) { if (ctx->ctx.cryptoapi.valid) CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); if (!CryptCreateHash(ctx->prov->prov.cryptoapi.handle, CALG_SHA1, 0, 0, &ctx->ctx.cryptoapi.hash_handle)) { ctx->ctx.cryptoapi.valid = 0; return -1; } ctx->ctx.cryptoapi.valid = 1; return 0; } GIT_INLINE(int) hash_cryptoapi_update(git_hash_ctx *ctx, const void *data, size_t len) { assert(ctx->ctx.cryptoapi.valid); if (!CryptHashData(ctx->ctx.cryptoapi.hash_handle, (const BYTE *)data, (DWORD)len, 0)) return -1; return 0; } GIT_INLINE(int) hash_cryptoapi_final(git_oid *out, git_hash_ctx *ctx) { DWORD len = 20; int error = 0; assert(ctx->ctx.cryptoapi.valid); if (!CryptGetHashParam(ctx->ctx.cryptoapi.hash_handle, HP_HASHVAL, out->id, &len, 0)) error = -1; CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); ctx->ctx.cryptoapi.valid = 0; return error; } GIT_INLINE(void) hash_ctx_cryptoapi_cleanup(git_hash_ctx *ctx) { if (ctx->ctx.cryptoapi.valid) CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); } /* CNG: Available in Windows Server 2008 and newer */ GIT_INLINE(int) hash_ctx_cng_init(git_hash_ctx *ctx) { if ((ctx->ctx.cng.hash_object = git__malloc(hash_prov.prov.cng.hash_object_size)) == NULL) return -1; 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) { git__free(ctx->ctx.cng.hash_object); return -1; } ctx->type = CNG; ctx->prov = &hash_prov; return 0; } GIT_INLINE(int) hash_cng_init(git_hash_ctx *ctx) { BYTE hash[GIT_OID_RAWSZ]; if (!ctx->ctx.cng.updated) return 0; /* CNG needs to be finished to restart */ if (ctx->prov->prov.cng.finish_hash(ctx->ctx.cng.hash_handle, hash, GIT_OID_RAWSZ, 0) < 0) return -1; ctx->ctx.cng.updated = 0; return 0; } GIT_INLINE(int) hash_cng_update(git_hash_ctx *ctx, const void *data, size_t len) { if (ctx->prov->prov.cng.hash_data(ctx->ctx.cng.hash_handle, (PBYTE)data, (ULONG)len, 0) < 0) return -1; return 0; } GIT_INLINE(int) hash_cng_final(git_oid *out, git_hash_ctx *ctx) { if (ctx->prov->prov.cng.finish_hash(ctx->ctx.cng.hash_handle, out->id, GIT_OID_RAWSZ, 0) < 0) return -1; ctx->ctx.cng.updated = 0; return 0; } GIT_INLINE(void) hash_ctx_cng_cleanup(git_hash_ctx *ctx) { ctx->prov->prov.cng.destroy_hash(ctx->ctx.cng.hash_handle); git__free(ctx->ctx.cng.hash_object); } /* Indirection between CryptoAPI and CNG */ int git_hash_ctx_init(git_hash_ctx *ctx) { int error = 0; assert(ctx); /* * When compiled with GIT_THREADS, the global hash_prov data is * initialized with git_libgit2_init. Otherwise, it must be initialized * at first use. */ if (hash_prov.type == INVALID && (error = git_hash_global_init()) < 0) return error; memset(ctx, 0x0, sizeof(git_hash_ctx)); return (hash_prov.type == CNG) ? hash_ctx_cng_init(ctx) : hash_ctx_cryptoapi_init(ctx); } int git_hash_init(git_hash_ctx *ctx) { assert(ctx && ctx->type); return (ctx->type == CNG) ? hash_cng_init(ctx) : hash_cryptoapi_init(ctx); } int git_hash_update(git_hash_ctx *ctx, const void *data, size_t len) { assert(ctx && ctx->type); return (ctx->type == CNG) ? hash_cng_update(ctx, data, len) : hash_cryptoapi_update(ctx, data, len); } int git_hash_final(git_oid *out, git_hash_ctx *ctx) { assert(ctx && ctx->type); return (ctx->type == CNG) ? hash_cng_final(out, ctx) : hash_cryptoapi_final(out, ctx); } void git_hash_ctx_cleanup(git_hash_ctx *ctx) { assert(ctx); if (ctx->type == CNG) hash_ctx_cng_cleanup(ctx); else if(ctx->type == CRYPTOAPI) hash_ctx_cryptoapi_cleanup(ctx); }