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 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