crypto_helpers.cc revision c407dc5cd9bdc5668497f21b26b09d988ab439de 
1// Copyright (c) 2009 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 "chrome/browser/sync/util/crypto_helpers.h"
6
7#include <string>
8#include <vector>
9
10#include "base/basictypes.h"
11#include "base/format_macros.h"
12#include "base/logging.h"
13#include "base/rand_util.h"
14#include "base/string_util.h"
15
16using std::string;
17using std::vector;
18
19MD5Calculator::MD5Calculator() {
20  MD5Init(&context_);
21}
22
23void MD5Calculator::AddData(const unsigned char* data, int length) {
24  CHECK(bin_digest_.empty());
25  MD5Update(&context_, data, length);
26}
27
28void MD5Calculator::CalcDigest() {
29  if (bin_digest_.empty()) {
30    MD5Digest digest;
31    MD5Final(&digest, &context_);
32    bin_digest_.assign(digest.a, digest.a + arraysize(digest.a));
33  }
34}
35
36vector<uint8> MD5Calculator::GetDigest() {
37  CalcDigest();
38  return bin_digest_;
39}
40
41std::string MD5Calculator::GetHexDigest() {
42  CalcDigest();
43  string hex = HexEncode(reinterpret_cast<char*>(&bin_digest_.front()),
44                         bin_digest_.size());
45  StringToLowerASCII(&hex);
46  return hex;
47}
48
49void GetRandomBytes(char* output, int output_length) {
50  for (int i = 0; i < output_length; i++) {
51    // TODO(chron): replace this with something less stupid.
52    output[i] = static_cast<char>(base::RandUint64());
53  }
54}
55
56string Generate128BitRandomHexString() {
57  int64 chunk1 = static_cast<int64>(base::RandUint64());
58  int64 chunk2 = static_cast<int64>(base::RandUint64());
59  return StringPrintf("%016" PRId64 "x%016" PRId64 "x", chunk1, chunk2);
60}
61