components/webdata/encryptor/encryptor_win.cc

   1 // Copyright (c) 2006-2008 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 "components/webdata/encryptor/encryptor.h"
   6
   7 #include <windows.h>
   8 #include <wincrypt.h>
   9 #include "base/strings/utf_string_conversions.h"
  10
  11 #pragma comment(lib, "crypt32.lib")
  12
  13 bool Encryptor::EncryptString16(const base::string16& plaintext,
  14                                 std::string* ciphertext) {
  15   return EncryptString(base::UTF16ToUTF8(plaintext), ciphertext);
  16 }
  17
  18 bool Encryptor::DecryptString16(const std::string& ciphertext,
  19                                 base::string16* plaintext) {
  20   std::string utf8;
  21   if (!DecryptString(ciphertext, &utf8))
  22     return false;
  23
  24   *plaintext = base::UTF8ToUTF16(utf8);
  25   return true;
  26 }
  27
  28 bool Encryptor::EncryptString(const std::string& plaintext,
  29                               std::string* ciphertext) {
  30   DATA_BLOB input;
  31   input.pbData = const_cast<BYTE*>(
  32       reinterpret_cast<const BYTE*>(plaintext.data()));
  33   input.cbData = static_cast<DWORD>(plaintext.length());
  34
  35   DATA_BLOB output;
  36   BOOL result = CryptProtectData(&input, L"", NULL, NULL, NULL,
  37                                  0, &output);
  38   if (!result)
  39     return false;
  40
  41   // this does a copy
  42   ciphertext->assign(reinterpret_cast<std::string::value_type*>(output.pbData),
  43                      output.cbData);
  44
  45   LocalFree(output.pbData);
  46   return true;
  47 }
  48
  49 bool Encryptor::DecryptString(const std::string& ciphertext,
  50                               std::string* plaintext) {
  51   DATA_BLOB input;
  52   input.pbData = const_cast<BYTE*>(
  53       reinterpret_cast<const BYTE*>(ciphertext.data()));
  54   input.cbData = static_cast<DWORD>(ciphertext.length());
  55
  56   DATA_BLOB output;
  57   BOOL result = CryptUnprotectData(&input, NULL, NULL, NULL, NULL,
  58                                    0, &output);
  59   if (!result)
  60     return false;
  61
  62   plaintext->assign(reinterpret_cast<char*>(output.pbData), output.cbData);
  63   LocalFree(output.pbData);
  64   return true;
  65 }