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1 // Copyright (c) 2010 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/base64.h" | |
14 #include "base/rand_util.h" | |
15 #include "base/string_number_conversions.h" | |
16 #include "base/string_util.h" | |
17 | |
18 using std::string; | |
19 using std::vector; | |
20 | |
21 MD5Calculator::MD5Calculator() { | |
22 MD5Init(&context_); | |
23 } | |
24 | |
25 MD5Calculator::~MD5Calculator() {} | |
26 | |
27 void MD5Calculator::AddData(const unsigned char* data, int length) { | |
28 CHECK(bin_digest_.empty()); | |
29 MD5Update(&context_, data, length); | |
30 } | |
31 | |
32 void MD5Calculator::CalcDigest() { | |
33 if (bin_digest_.empty()) { | |
34 MD5Digest digest; | |
35 MD5Final(&digest, &context_); | |
36 bin_digest_.assign(digest.a, digest.a + arraysize(digest.a)); | |
37 } | |
38 } | |
39 | |
40 const vector<uint8>& MD5Calculator::GetDigest() { | |
41 CalcDigest(); | |
42 return bin_digest_; | |
43 } | |
44 | |
45 std::string MD5Calculator::GetHexDigest() { | |
46 CalcDigest(); | |
47 string hex = base::HexEncode(reinterpret_cast<char*>(&bin_digest_.front()), | |
48 bin_digest_.size()); | |
49 StringToLowerASCII(&hex); | |
50 return hex; | |
51 } | |
52 | |
53 void GetRandomBytes(char* output, int output_length) { | |
54 uint64 random_int; | |
55 const char* random_int_bytes = reinterpret_cast<const char*>(&random_int); | |
56 int random_int_size = sizeof(random_int); | |
57 for (int i = 0; i < output_length; i += random_int_size) { | |
58 random_int = base::RandUint64(); | |
59 int copy_count = std::min(output_length - i, random_int_size); | |
60 memcpy(output + i, random_int_bytes, copy_count); | |
61 } | |
62 } | |
63 | |
64 string Generate128BitRandomHexString() { | |
65 const int kNumberBytes = 128 / 8; | |
66 std::string random_bytes(kNumberBytes, ' '); | |
67 GetRandomBytes(&random_bytes[0], kNumberBytes); | |
68 std::string base64_encoded_bytes; | |
69 base::Base64Encode(random_bytes, &base64_encoded_bytes); | |
70 return base64_encoded_bytes; | |
71 } | |
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