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
15namespace base {
16
17std::string SHA1HashString(const std::string& str) {
18  ScopedHCRYPTPROV provider;
19  if (!CryptAcquireContext(provider.receive(), NULL, NULL, PROV_RSA_FULL,
20                           CRYPT_VERIFYCONTEXT)) {
21    DPLOG(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      DPLOG(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      DPLOG(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      DPLOG(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      DPLOG(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
68