diff options
Diffstat (limited to 'src/util/hash/win32.c')
| -rw-r--r-- | src/util/hash/win32.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/src/util/hash/win32.c b/src/util/hash/win32.c new file mode 100644 index 0000000..f80c0d5 --- /dev/null +++ b/src/util/hash/win32.c @@ -0,0 +1,549 @@ +/* + * 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 "win32.h" + +#include "runtime.h" + +#include <wincrypt.h> +#include <strsafe.h> + +#define GIT_HASH_CNG_DLL_NAME "bcrypt.dll" + +/* BCRYPT_SHA1_ALGORITHM */ +#define GIT_HASH_CNG_SHA1_TYPE L"SHA1" +#define GIT_HASH_CNG_SHA256_TYPE L"SHA256" + +/* BCRYPT_OBJECT_LENGTH */ +#define GIT_HASH_CNG_HASH_OBJECT_LEN L"ObjectLength" + +/* BCRYPT_HASH_REUSEABLE_FLAGS */ +#define GIT_HASH_CNG_HASH_REUSABLE 0x00000020 + +/* Definitions */ + +/* CryptoAPI is available for hashing on Windows XP and newer. */ +struct cryptoapi_provider { + HCRYPTPROV handle; +}; + +/* + * CNG (bcrypt.dll) is significantly more performant than CryptoAPI and is + * preferred, however it is only available on Windows 2008 and newer and + * must therefore be dynamically loaded, and we must inline constants that + * would not exist when building in pre-Windows 2008 environments. + */ + +/* Function declarations for CNG */ +typedef NTSTATUS (WINAPI *cng_open_algorithm_provider_fn)( + HANDLE /* BCRYPT_ALG_HANDLE */ *phAlgorithm, + LPCWSTR pszAlgId, + LPCWSTR pszImplementation, + DWORD dwFlags); + +typedef NTSTATUS (WINAPI *cng_get_property_fn)( + HANDLE /* BCRYPT_HANDLE */ hObject, + LPCWSTR pszProperty, + PUCHAR pbOutput, + ULONG cbOutput, + ULONG *pcbResult, + ULONG dwFlags); + +typedef NTSTATUS (WINAPI *cng_create_hash_fn)( + HANDLE /* BCRYPT_ALG_HANDLE */ hAlgorithm, + HANDLE /* BCRYPT_HASH_HANDLE */ *phHash, + PUCHAR pbHashObject, ULONG cbHashObject, + PUCHAR pbSecret, + ULONG cbSecret, + ULONG dwFlags); + +typedef NTSTATUS (WINAPI *cng_finish_hash_fn)( + HANDLE /* BCRYPT_HASH_HANDLE */ hHash, + PUCHAR pbOutput, + ULONG cbOutput, + ULONG dwFlags); + +typedef NTSTATUS (WINAPI *cng_hash_data_fn)( + HANDLE /* BCRYPT_HASH_HANDLE */ hHash, + PUCHAR pbInput, + ULONG cbInput, + ULONG dwFlags); + +typedef NTSTATUS (WINAPI *cng_destroy_hash_fn)( + HANDLE /* BCRYPT_HASH_HANDLE */ hHash); + +typedef NTSTATUS (WINAPI *cng_close_algorithm_provider_fn)( + HANDLE /* BCRYPT_ALG_HANDLE */ hAlgorithm, + ULONG dwFlags); + +struct cng_provider { + /* DLL for CNG */ + HINSTANCE dll; + + /* Function pointers for CNG */ + cng_open_algorithm_provider_fn open_algorithm_provider; + cng_get_property_fn get_property; + cng_create_hash_fn create_hash; + cng_finish_hash_fn finish_hash; + cng_hash_data_fn hash_data; + cng_destroy_hash_fn destroy_hash; + cng_close_algorithm_provider_fn close_algorithm_provider; + + HANDLE /* BCRYPT_ALG_HANDLE */ sha1_handle; + DWORD sha1_object_size; + + HANDLE /* BCRYPT_ALG_HANDLE */ sha256_handle; + DWORD sha256_object_size; +}; + +typedef struct { + git_hash_win32_provider_t type; + + union { + struct cryptoapi_provider cryptoapi; + struct cng_provider cng; + } provider; +} hash_win32_provider; + +/* Hash provider definition */ + +static hash_win32_provider hash_provider = {0}; + +/* Hash initialization */ + +/* Initialize CNG, if available */ +GIT_INLINE(int) cng_provider_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)) { + git_error_set(GIT_ERROR_SHA, "CryptoNG is not supported on this platform"); + 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_provider.provider.cng.dll = LoadLibrary(dll_path)) == NULL) { + git_error_set(GIT_ERROR_SHA, "CryptoNG library could not be loaded"); + return -1; + } + + /* Load the function addresses */ + if ((hash_provider.provider.cng.open_algorithm_provider = (cng_open_algorithm_provider_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptOpenAlgorithmProvider"))) == NULL || + (hash_provider.provider.cng.get_property = (cng_get_property_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptGetProperty"))) == NULL || + (hash_provider.provider.cng.create_hash = (cng_create_hash_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptCreateHash"))) == NULL || + (hash_provider.provider.cng.finish_hash = (cng_finish_hash_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptFinishHash"))) == NULL || + (hash_provider.provider.cng.hash_data = (cng_hash_data_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptHashData"))) == NULL || + (hash_provider.provider.cng.destroy_hash = (cng_destroy_hash_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptDestroyHash"))) == NULL || + (hash_provider.provider.cng.close_algorithm_provider = (cng_close_algorithm_provider_fn)((void *)GetProcAddress(hash_provider.provider.cng.dll, "BCryptCloseAlgorithmProvider"))) == NULL) { + FreeLibrary(hash_provider.provider.cng.dll); + + git_error_set(GIT_ERROR_OS, "CryptoNG functions could not be loaded"); + return -1; + } + + /* Load the SHA1 algorithm */ + if (hash_provider.provider.cng.open_algorithm_provider(&hash_provider.provider.cng.sha1_handle, GIT_HASH_CNG_SHA1_TYPE, NULL, GIT_HASH_CNG_HASH_REUSABLE) < 0 || + hash_provider.provider.cng.get_property(hash_provider.provider.cng.sha1_handle, GIT_HASH_CNG_HASH_OBJECT_LEN, (PBYTE)&hash_provider.provider.cng.sha1_object_size, sizeof(DWORD), &size_len, 0) < 0) { + git_error_set(GIT_ERROR_OS, "algorithm provider could not be initialized"); + goto on_error; + } + + /* Load the SHA256 algorithm */ + if (hash_provider.provider.cng.open_algorithm_provider(&hash_provider.provider.cng.sha256_handle, GIT_HASH_CNG_SHA256_TYPE, NULL, GIT_HASH_CNG_HASH_REUSABLE) < 0 || + hash_provider.provider.cng.get_property(hash_provider.provider.cng.sha256_handle, GIT_HASH_CNG_HASH_OBJECT_LEN, (PBYTE)&hash_provider.provider.cng.sha256_object_size, sizeof(DWORD), &size_len, 0) < 0) { + git_error_set(GIT_ERROR_OS, "algorithm provider could not be initialized"); + goto on_error; + } + + hash_provider.type = GIT_HASH_WIN32_CNG; + return 0; + +on_error: + if (hash_provider.provider.cng.sha1_handle) + hash_provider.provider.cng.close_algorithm_provider(hash_provider.provider.cng.sha1_handle, 0); + + if (hash_provider.provider.cng.sha256_handle) + hash_provider.provider.cng.close_algorithm_provider(hash_provider.provider.cng.sha256_handle, 0); + + if (hash_provider.provider.cng.dll) + FreeLibrary(hash_provider.provider.cng.dll); + + return -1; +} + +GIT_INLINE(void) cng_provider_shutdown(void) +{ + if (hash_provider.type == GIT_HASH_WIN32_INVALID) + return; + + hash_provider.provider.cng.close_algorithm_provider(hash_provider.provider.cng.sha1_handle, 0); + hash_provider.provider.cng.close_algorithm_provider(hash_provider.provider.cng.sha256_handle, 0); + FreeLibrary(hash_provider.provider.cng.dll); + + hash_provider.type = GIT_HASH_WIN32_INVALID; +} + +/* Initialize CryptoAPI */ +GIT_INLINE(int) cryptoapi_provider_init(void) +{ + if (!CryptAcquireContext(&hash_provider.provider.cryptoapi.handle, NULL, 0, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) { + git_error_set(GIT_ERROR_OS, "legacy hash context could not be started"); + return -1; + } + + hash_provider.type = GIT_HASH_WIN32_CRYPTOAPI; + return 0; +} + +GIT_INLINE(void) cryptoapi_provider_shutdown(void) +{ + if (hash_provider.type == GIT_HASH_WIN32_INVALID) + return; + + CryptReleaseContext(hash_provider.provider.cryptoapi.handle, 0); + + hash_provider.type = GIT_HASH_WIN32_INVALID; +} + +static void hash_provider_shutdown(void) +{ + if (hash_provider.type == GIT_HASH_WIN32_CNG) + cng_provider_shutdown(); + else if (hash_provider.type == GIT_HASH_WIN32_CRYPTOAPI) + cryptoapi_provider_shutdown(); +} + +static int hash_provider_init(void) +{ + int error = 0; + + if (hash_provider.type != GIT_HASH_WIN32_INVALID) + return 0; + + if ((error = cng_provider_init()) < 0) + error = cryptoapi_provider_init(); + + if (!error) + error = git_runtime_shutdown_register(hash_provider_shutdown); + + return error; +} + +git_hash_win32_provider_t git_hash_win32_provider(void) +{ + return hash_provider.type; +} + +int git_hash_win32_set_provider(git_hash_win32_provider_t provider) +{ + if (provider == hash_provider.type) + return 0; + + hash_provider_shutdown(); + + if (provider == GIT_HASH_WIN32_CNG) + return cng_provider_init(); + else if (provider == GIT_HASH_WIN32_CRYPTOAPI) + return cryptoapi_provider_init(); + + git_error_set(GIT_ERROR_SHA, "unsupported win32 provider"); + return -1; +} + +/* CryptoAPI: available in Windows XP and newer */ + +GIT_INLINE(int) hash_cryptoapi_init(git_hash_win32_ctx *ctx) +{ + if (ctx->ctx.cryptoapi.valid) + CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); + + if (!CryptCreateHash(hash_provider.provider.cryptoapi.handle, ctx->algorithm, 0, 0, &ctx->ctx.cryptoapi.hash_handle)) { + ctx->ctx.cryptoapi.valid = 0; + git_error_set(GIT_ERROR_OS, "legacy hash implementation could not be created"); + return -1; + } + + ctx->ctx.cryptoapi.valid = 1; + return 0; +} + +GIT_INLINE(int) hash_cryptoapi_update(git_hash_win32_ctx *ctx, const void *_data, size_t len) +{ + const BYTE *data = (BYTE *)_data; + + GIT_ASSERT(ctx->ctx.cryptoapi.valid); + + while (len > 0) { + DWORD chunk = (len > MAXDWORD) ? MAXDWORD : (DWORD)len; + + if (!CryptHashData(ctx->ctx.cryptoapi.hash_handle, data, chunk, 0)) { + git_error_set(GIT_ERROR_OS, "legacy hash data could not be updated"); + return -1; + } + + data += chunk; + len -= chunk; + } + + return 0; +} + +GIT_INLINE(int) hash_cryptoapi_final(unsigned char *out, git_hash_win32_ctx *ctx) +{ + DWORD len = ctx->algorithm == CALG_SHA_256 ? GIT_HASH_SHA256_SIZE : GIT_HASH_SHA1_SIZE; + int error = 0; + + GIT_ASSERT(ctx->ctx.cryptoapi.valid); + + if (!CryptGetHashParam(ctx->ctx.cryptoapi.hash_handle, HP_HASHVAL, out, &len, 0)) { + git_error_set(GIT_ERROR_OS, "legacy hash data could not be finished"); + error = -1; + } + + CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); + ctx->ctx.cryptoapi.valid = 0; + + return error; +} + +GIT_INLINE(void) hash_ctx_cryptoapi_cleanup(git_hash_win32_ctx *ctx) +{ + if (ctx->ctx.cryptoapi.valid) + CryptDestroyHash(ctx->ctx.cryptoapi.hash_handle); +} + +GIT_INLINE(int) hash_sha1_cryptoapi_ctx_init_init(git_hash_win32_ctx *ctx) +{ + ctx->algorithm = CALG_SHA1; + return hash_cryptoapi_init(ctx); +} + +GIT_INLINE(int) hash_sha256_cryptoapi_ctx_init(git_hash_win32_ctx *ctx) +{ + ctx->algorithm = CALG_SHA_256; + return hash_cryptoapi_init(ctx); +} + +/* CNG: Available in Windows Server 2008 and newer */ + +GIT_INLINE(int) hash_sha1_cng_ctx_init(git_hash_win32_ctx *ctx) +{ + if ((ctx->ctx.cng.hash_object = git__malloc(hash_provider.provider.cng.sha1_object_size)) == NULL) + return -1; + + if (hash_provider.provider.cng.create_hash(hash_provider.provider.cng.sha1_handle, &ctx->ctx.cng.hash_handle, ctx->ctx.cng.hash_object, hash_provider.provider.cng.sha1_object_size, NULL, 0, 0) < 0) { + git__free(ctx->ctx.cng.hash_object); + + git_error_set(GIT_ERROR_OS, "sha1 implementation could not be created"); + return -1; + } + + ctx->algorithm = CALG_SHA1; + return 0; +} + +GIT_INLINE(int) hash_sha256_cng_ctx_init(git_hash_win32_ctx *ctx) +{ + if ((ctx->ctx.cng.hash_object = git__malloc(hash_provider.provider.cng.sha256_object_size)) == NULL) + return -1; + + if (hash_provider.provider.cng.create_hash(hash_provider.provider.cng.sha256_handle, &ctx->ctx.cng.hash_handle, ctx->ctx.cng.hash_object, hash_provider.provider.cng.sha256_object_size, NULL, 0, 0) < 0) { + git__free(ctx->ctx.cng.hash_object); + + git_error_set(GIT_ERROR_OS, "sha256 implementation could not be created"); + return -1; + } + + ctx->algorithm = CALG_SHA_256; + return 0; +} + +GIT_INLINE(int) hash_cng_init(git_hash_win32_ctx *ctx) +{ + BYTE hash[GIT_HASH_SHA256_SIZE]; + ULONG size = ctx->algorithm == CALG_SHA_256 ? GIT_HASH_SHA256_SIZE : GIT_HASH_SHA1_SIZE; + + if (!ctx->ctx.cng.updated) + return 0; + + /* CNG needs to be finished to restart */ + if (hash_provider.provider.cng.finish_hash(ctx->ctx.cng.hash_handle, hash, size, 0) < 0) { + git_error_set(GIT_ERROR_OS, "hash implementation could not be finished"); + return -1; + } + + ctx->ctx.cng.updated = 0; + + return 0; +} + +GIT_INLINE(int) hash_cng_update(git_hash_win32_ctx *ctx, const void *_data, size_t len) +{ + PBYTE data = (PBYTE)_data; + + while (len > 0) { + ULONG chunk = (len > ULONG_MAX) ? ULONG_MAX : (ULONG)len; + + if (hash_provider.provider.cng.hash_data(ctx->ctx.cng.hash_handle, data, chunk, 0) < 0) { + git_error_set(GIT_ERROR_OS, "hash could not be updated"); + return -1; + } + + data += chunk; + len -= chunk; + } + + return 0; +} + +GIT_INLINE(int) hash_cng_final(unsigned char *out, git_hash_win32_ctx *ctx) +{ + ULONG size = ctx->algorithm == CALG_SHA_256 ? GIT_HASH_SHA256_SIZE : GIT_HASH_SHA1_SIZE; + + if (hash_provider.provider.cng.finish_hash(ctx->ctx.cng.hash_handle, out, size, 0) < 0) { + git_error_set(GIT_ERROR_OS, "hash could not be finished"); + return -1; + } + + ctx->ctx.cng.updated = 0; + + return 0; +} + +GIT_INLINE(void) hash_ctx_cng_cleanup(git_hash_win32_ctx *ctx) +{ + hash_provider.provider.cng.destroy_hash(ctx->ctx.cng.hash_handle); + git__free(ctx->ctx.cng.hash_object); +} + +/* Indirection between CryptoAPI and CNG */ + +GIT_INLINE(int) hash_sha1_win32_ctx_init(git_hash_win32_ctx *ctx) +{ + GIT_ASSERT_ARG(hash_provider.type); + + memset(ctx, 0x0, sizeof(git_hash_win32_ctx)); + return (hash_provider.type == GIT_HASH_WIN32_CNG) ? hash_sha1_cng_ctx_init(ctx) : hash_sha1_cryptoapi_ctx_init_init(ctx); +} + +GIT_INLINE(int) hash_sha256_win32_ctx_init(git_hash_win32_ctx *ctx) +{ + GIT_ASSERT_ARG(hash_provider.type); + + memset(ctx, 0x0, sizeof(git_hash_win32_ctx)); + return (hash_provider.type == GIT_HASH_WIN32_CNG) ? hash_sha256_cng_ctx_init(ctx) : hash_sha256_cryptoapi_ctx_init(ctx); +} + +GIT_INLINE(int) hash_win32_init(git_hash_win32_ctx *ctx) +{ + return (hash_provider.type == GIT_HASH_WIN32_CNG) ? hash_cng_init(ctx) : hash_cryptoapi_init(ctx); +} + +GIT_INLINE(int) hash_win32_update(git_hash_win32_ctx *ctx, const void *data, size_t len) +{ + return (hash_provider.type == GIT_HASH_WIN32_CNG) ? hash_cng_update(ctx, data, len) : hash_cryptoapi_update(ctx, data, len); +} + +GIT_INLINE(int) hash_win32_final(unsigned char *out, git_hash_win32_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return (hash_provider.type == GIT_HASH_WIN32_CNG) ? hash_cng_final(out, ctx) : hash_cryptoapi_final(out, ctx); +} + +GIT_INLINE(void) hash_win32_cleanup(git_hash_win32_ctx *ctx) +{ + if (hash_provider.type == GIT_HASH_WIN32_CNG) + hash_ctx_cng_cleanup(ctx); + else if(hash_provider.type == GIT_HASH_WIN32_CRYPTOAPI) + hash_ctx_cryptoapi_cleanup(ctx); +} + +#ifdef GIT_SHA1_WIN32 + +int git_hash_sha1_global_init(void) +{ + return hash_provider_init(); +} + +int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_sha1_win32_ctx_init(&ctx->win32); +} + +int git_hash_sha1_init(git_hash_sha1_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_init(&ctx->win32); +} + +int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_update(&ctx->win32, data, len); +} + +int git_hash_sha1_final(unsigned char *out, git_hash_sha1_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_final(out, &ctx->win32); +} + +void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx) +{ + if (!ctx) + return; + hash_win32_cleanup(&ctx->win32); +} + +#endif + +#ifdef GIT_SHA256_WIN32 + +int git_hash_sha256_global_init(void) +{ + return hash_provider_init(); +} + +int git_hash_sha256_ctx_init(git_hash_sha256_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_sha256_win32_ctx_init(&ctx->win32); +} + +int git_hash_sha256_init(git_hash_sha256_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_init(&ctx->win32); +} + +int git_hash_sha256_update(git_hash_sha256_ctx *ctx, const void *data, size_t len) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_update(&ctx->win32, data, len); +} + +int git_hash_sha256_final(unsigned char *out, git_hash_sha256_ctx *ctx) +{ + GIT_ASSERT_ARG(ctx); + return hash_win32_final(out, &ctx->win32); +} + +void git_hash_sha256_ctx_cleanup(git_hash_sha256_ctx *ctx) +{ + if (!ctx) + return; + hash_win32_cleanup(&ctx->win32); +} + +#endif |