base/sha1_win.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sha1.h"
   6
   7 #include <windows.h>
   8 #include <wincrypt.h>
   9
  10 // This file is not being compiled at the moment (see bug 47218). If we keep
  11 // sha1 inside base, we cannot depend on src/crypto.
  12 // #include "crypto/scoped_capi_types.h"
  13 #include "base/logging.h"
  14
  15 namespace base {
  16
  17 std::string SHA1HashString(const std::string& str) {
  18   ScopedHCRYPTPROV provider;
  19   if (!CryptAcquireContext(provider.receive(), NULL, NULL, PROV_RSA_FULL,
  20                            CRYPT_VERIFYCONTEXT)) {
  21     DLOG_GETLASTERROR(ERROR) << "CryptAcquireContext failed";
  22     return std::string(kSHA1Length, '\0');
  23   }
  24
  25   {
  26     ScopedHCRYPTHASH hash;
  27     if (!CryptCreateHash(provider, CALG_SHA1, 0, 0, hash.receive())) {
  28       DLOG_GETLASTERROR(ERROR) << "CryptCreateHash failed";
  29       return std::string(kSHA1Length, '\0');
  30     }
  31
  32     if (!CryptHashData(hash, reinterpret_cast<CONST BYTE*>(str.data()),
  33                        static_cast<DWORD>(str.length()), 0)) {
  34       DLOG_GETLASTERROR(ERROR) << "CryptHashData failed";
  35       return std::string(kSHA1Length, '\0');
  36     }
  37
  38     DWORD hash_len = 0;
  39     DWORD buffer_size = sizeof hash_len;
  40     if (!CryptGetHashParam(hash, HP_HASHSIZE,
  41                            reinterpret_cast<unsigned char*>(&hash_len),
  42                            &buffer_size, 0)) {
  43       DLOG_GETLASTERROR(ERROR) << "CryptGetHashParam(HP_HASHSIZE) failed";
  44       return std::string(kSHA1Length, '\0');
  45     }
  46
  47     std::string result;
  48     if (!CryptGetHashParam(hash, HP_HASHVAL,
  49         // We need the + 1 here not because the call will write a trailing \0,
  50         // but so that result.length() is correctly set to |hash_len|.
  51         reinterpret_cast<BYTE*>(WriteInto(&result, hash_len + 1)), &hash_len,
  52         0))) {
  53       DLOG_GETLASTERROR(ERROR) << "CryptGetHashParam(HP_HASHVAL) failed";
  54       return std::string(kSHA1Length, '\0');
  55     }
  56
  57     if (hash_len != kSHA1Length) {
  58       DLOG(ERROR) << "Returned hash value is wrong length: " << hash_len
  59                   << " should be " << kSHA1Length;
  60       return std::string(kSHA1Length, '\0');
  61     }
  62
  63     return result;
  64   }
  65 }
  66
  67 }  // namespace base