1/*
2 *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/base/sslfingerprint.h"
12
13#include <ctype.h>
14#include <string>
15
16#include "webrtc/base/helpers.h"
17#include "webrtc/base/messagedigest.h"
18#include "webrtc/base/stringencode.h"
19
20namespace rtc {
21
22SSLFingerprint* SSLFingerprint::Create(
23    const std::string& algorithm, const rtc::SSLIdentity* identity) {
24  if (!identity) {
25    return NULL;
26  }
27
28  return Create(algorithm, &(identity->certificate()));
29}
30
31SSLFingerprint* SSLFingerprint::Create(
32    const std::string& algorithm, const rtc::SSLCertificate* cert) {
33  uint8 digest_val[64];
34  size_t digest_len;
35  bool ret = cert->ComputeDigest(
36      algorithm, digest_val, sizeof(digest_val), &digest_len);
37  if (!ret) {
38    return NULL;
39  }
40
41  return new SSLFingerprint(algorithm, digest_val, digest_len);
42}
43
44SSLFingerprint* SSLFingerprint::CreateFromRfc4572(
45    const std::string& algorithm, const std::string& fingerprint) {
46  if (algorithm.empty() || !rtc::IsFips180DigestAlgorithm(algorithm))
47    return NULL;
48
49  if (fingerprint.empty())
50    return NULL;
51
52  size_t value_len;
53  char value[rtc::MessageDigest::kMaxSize];
54  value_len = rtc::hex_decode_with_delimiter(value, sizeof(value),
55                                                   fingerprint.c_str(),
56                                                   fingerprint.length(),
57                                                   ':');
58  if (!value_len)
59    return NULL;
60
61  return new SSLFingerprint(algorithm,
62                            reinterpret_cast<uint8*>(value),
63                            value_len);
64}
65
66SSLFingerprint::SSLFingerprint(
67    const std::string& algorithm, const uint8* digest_in, size_t digest_len)
68    : algorithm(algorithm) {
69  digest.SetData(digest_in, digest_len);
70}
71
72SSLFingerprint::SSLFingerprint(const SSLFingerprint& from)
73    : algorithm(from.algorithm), digest(from.digest) {}
74
75bool SSLFingerprint::operator==(const SSLFingerprint& other) const {
76  return algorithm == other.algorithm &&
77         digest == other.digest;
78}
79
80std::string SSLFingerprint::GetRfc4572Fingerprint() const {
81  std::string fingerprint =
82      rtc::hex_encode_with_delimiter(
83          digest.data(), digest.length(), ':');
84  std::transform(fingerprint.begin(), fingerprint.end(),
85                 fingerprint.begin(), ::toupper);
86  return fingerprint;
87}
88
89std::string SSLFingerprint::ToString() {
90  std::string fp_str = algorithm;
91  fp_str.append(" ");
92  fp_str.append(GetRfc4572Fingerprint());
93  return fp_str;
94}
95
96}  // namespace rtc
97