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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 
SHA1HashString(const std::string & str)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     LOG(ERROR) << "CryptAcquireContext failed: " << GetLastError();
22     return std::string(SHA1_LENGTH, '\0');
23   }
24 
25   {
26     ScopedHCRYPTHASH hash;
27     if (!CryptCreateHash(provider, CALG_SHA1, 0, 0, hash.receive())) {
28       LOG(ERROR) << "CryptCreateHash failed: " << GetLastError();
29       return std::string(SHA1_LENGTH, '\0');
30     }
31 
32     if (!CryptHashData(hash, reinterpret_cast<CONST BYTE*>(str.data()),
33                        static_cast<DWORD>(str.length()), 0)) {
34       LOG(ERROR) << "CryptHashData failed: " << GetLastError();
35       return std::string(SHA1_LENGTH, '\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       LOG(ERROR) << "CryptGetHashParam(HP_HASHSIZE) failed: " << GetLastError();
44       return std::string(SHA1_LENGTH, '\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       LOG(ERROR) << "CryptGetHashParam(HP_HASHVAL) failed: " << GetLastError();
54       return std::string(SHA1_LENGTH, '\0');
55     }
56 
57     if (hash_len != SHA1_LENGTH) {
58       LOG(ERROR) << "Returned hash value is wrong length: " << hash_len
59                  << " should be " << SHA1_LENGTH;
60       return std::string(SHA1_LENGTH, '\0');
61     }
62 
63     return result;
64   }
65 }
66 
67 }  // namespace base
68