thodg/libgit2/src/hash/hash_win32.h

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first
  
  Next to including several files, our "common.h" header also declares
  various macros which are then used throughout the project. As such, we
  have to make sure to always include this file first in all
  implementation files. Otherwise, we might encounter problems or even
  silent behavioural differences due to macros or defines not being
  defined as they should be. So in fact, our header and implementation
  files should make sure to always include "common.h" first.
  
  This commit does so by establishing a common include pattern. Header
  files inside of "src" will now always include "common.h" as its first
  other file, separated by a newline from all the other includes to make
  it stand out as special. There are two cases for the implementation
  files. If they do have a matching header file, they will always include
  this one first, leading to "common.h" being transitively included as
  first file. If they do not have a matching header file, they instead
  include "common.h" as first file themselves.
  
  This fixes the outlined problems and will become our standard practice
  for header and source files inside of the "src/" from now on.
  

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• src/hash/hash_win32.h

• /*
   * 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.
   */
  
  #ifndef INCLUDE_hash_win32_h__
  #define INCLUDE_hash_win32_h__
  
  #include "common.h"
  
  #include "hash.h"
  
  #include <wincrypt.h>
  #include <strsafe.h>
  
  enum hash_win32_prov_type {
  	INVALID = 0,
  	CRYPTOAPI,
  	CNG
  };
  
  /*
   * CryptoAPI is available for hashing on Windows XP and newer.
   */
  
  struct hash_cryptoapi_prov {
  	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.
   */
  
  #define GIT_HASH_CNG_DLL_NAME           "bcrypt.dll"
  
  /* BCRYPT_SHA1_ALGORITHM */
  #define GIT_HASH_CNG_HASH_TYPE          L"SHA1"
  
  /* BCRYPT_OBJECT_LENGTH */
  #define GIT_HASH_CNG_HASH_OBJECT_LEN    L"ObjectLength"
  
  /* BCRYPT_HASH_REUSEABLE_FLAGS */
  #define GIT_HASH_CNG_HASH_REUSABLE      0x00000020
  
  /* Function declarations for CNG */
  typedef NTSTATUS (WINAPI *hash_win32_cng_open_algorithm_provider_fn)(
  	HANDLE /* BCRYPT_ALG_HANDLE */ *phAlgorithm,
  	LPCWSTR pszAlgId,
  	LPCWSTR pszImplementation,
  	DWORD dwFlags);
  
  typedef NTSTATUS (WINAPI *hash_win32_cng_get_property_fn)(
  	HANDLE /* BCRYPT_HANDLE */ hObject,
  	LPCWSTR pszProperty,
  	PUCHAR pbOutput,
  	ULONG cbOutput,
  	ULONG *pcbResult,
  	ULONG dwFlags);
  
  typedef NTSTATUS (WINAPI *hash_win32_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 *hash_win32_cng_finish_hash_fn)(
  	HANDLE /* BCRYPT_HASH_HANDLE */ hHash,
  	PUCHAR pbOutput,
  	ULONG cbOutput,
  	ULONG dwFlags);
  
  typedef NTSTATUS (WINAPI *hash_win32_cng_hash_data_fn)(
  	HANDLE /* BCRYPT_HASH_HANDLE */ hHash,
  	PUCHAR pbInput,
  	ULONG cbInput,
  	ULONG dwFlags);
  
  typedef NTSTATUS (WINAPI *hash_win32_cng_destroy_hash_fn)(
  	HANDLE /* BCRYPT_HASH_HANDLE */ hHash);
  
  typedef NTSTATUS (WINAPI *hash_win32_cng_close_algorithm_provider_fn)(
  	HANDLE /* BCRYPT_ALG_HANDLE */ hAlgorithm,
  	ULONG dwFlags);
  
  struct hash_cng_prov {
  	/* DLL for CNG */
  	HINSTANCE dll;
  
  	/* Function pointers for CNG */
  	hash_win32_cng_open_algorithm_provider_fn open_algorithm_provider;
  	hash_win32_cng_get_property_fn get_property;
  	hash_win32_cng_create_hash_fn create_hash;
  	hash_win32_cng_finish_hash_fn finish_hash;
  	hash_win32_cng_hash_data_fn hash_data;
  	hash_win32_cng_destroy_hash_fn destroy_hash;
  	hash_win32_cng_close_algorithm_provider_fn close_algorithm_provider;
  
  	HANDLE /* BCRYPT_ALG_HANDLE */ handle;
  	DWORD hash_object_size;
  };
  
  struct git_hash_prov {
  	enum hash_win32_prov_type type;
  
  	union {
  		struct hash_cryptoapi_prov cryptoapi;
  		struct hash_cng_prov cng;
  	} prov;
  };
  
  /* Hash contexts */
  
  struct hash_cryptoapi_ctx {
  	bool valid;
  	HCRYPTHASH hash_handle;
  };
  
  struct hash_cng_ctx {
  	bool updated;
  	HANDLE /* BCRYPT_HASH_HANDLE */ hash_handle;
  	PBYTE hash_object;
  };
  
  struct git_hash_ctx {
  	enum hash_win32_prov_type type;
  	git_hash_prov *prov;
  
  	union {
  		struct hash_cryptoapi_ctx cryptoapi;
  		struct hash_cng_ctx cng;
  	} ctx;
  };
  
  #endif /* INCLUDE_hash_openssl_h__ */
  

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