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* Copyright 2012 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "webrtc/rtc_base/sslfingerprint.h"
#include <ctype.h>
#include <string>
#include "webrtc/rtc_base/helpers.h"
#include "webrtc/rtc_base/logging.h"
#include "webrtc/rtc_base/messagedigest.h"
#include "webrtc/rtc_base/stringencode.h"
namespace rtc {
SSLFingerprint* SSLFingerprint::Create(
const std::string& algorithm, const rtc::SSLIdentity* identity) {
if (!identity) {
return nullptr;
return Create(algorithm, &(identity->certificate()));
SSLFingerprint* SSLFingerprint::Create(
const std::string& algorithm, const rtc::SSLCertificate* cert) {
uint8_t digest_val[64];
size_t digest_len;
bool ret = cert->ComputeDigest(
algorithm, digest_val, sizeof(digest_val), &digest_len);
if (!ret) {
return nullptr;
return new SSLFingerprint(algorithm, digest_val, digest_len);
SSLFingerprint* SSLFingerprint::CreateFromRfc4572(
const std::string& algorithm, const std::string& fingerprint) {
if (algorithm.empty() || !rtc::IsFips180DigestAlgorithm(algorithm))
return nullptr;
if (fingerprint.empty())
return nullptr;
size_t value_len;
char value[rtc::MessageDigest::kMaxSize];
value_len = rtc::hex_decode_with_delimiter(value, sizeof(value),
if (!value_len)
return nullptr;
return new SSLFingerprint(algorithm, reinterpret_cast<uint8_t*>(value),
SSLFingerprint* SSLFingerprint::CreateFromCertificate(
const RTCCertificate* cert) {
std::string digest_alg;
if (!cert->ssl_certificate().GetSignatureDigestAlgorithm(&digest_alg)) {
LOG(LS_ERROR) << "Failed to retrieve the certificate's digest algorithm";
return nullptr;
SSLFingerprint* fingerprint = Create(digest_alg, cert->identity());
if (!fingerprint) {
LOG(LS_ERROR) << "Failed to create identity fingerprint, alg="
<< digest_alg;
return fingerprint;
SSLFingerprint::SSLFingerprint(const std::string& algorithm,
const uint8_t* digest_in,
size_t digest_len)
: algorithm(algorithm) {
digest.SetData(digest_in, digest_len);
SSLFingerprint::SSLFingerprint(const SSLFingerprint& from)
: algorithm(from.algorithm), digest(from.digest) {}
bool SSLFingerprint::operator==(const SSLFingerprint& other) const {
return algorithm == other.algorithm &&
digest == other.digest;
std::string SSLFingerprint::GetRfc4572Fingerprint() const {
std::string fingerprint =
rtc::hex_encode_with_delimiter(<char>(), digest.size(), ':');
std::transform(fingerprint.begin(), fingerprint.end(),
fingerprint.begin(), ::toupper);
return fingerprint;
std::string SSLFingerprint::ToString() const {
std::string fp_str = algorithm;
fp_str.append(" ");
return fp_str;
} // namespace rtc