1 files changed, 133 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/ssl_certificate.cc b/third_party/libwebrtc/rtc_base/ssl_certificate.cc
new file mode 100644
index 0000000000..ddb1524f76
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/ssl_certificate.cc
@@ -0,0 +1,133 @@
+/*
+ *  Copyright 2004 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 "rtc_base/ssl_certificate.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "absl/algorithm/container.h"
+#include "absl/strings/string_view.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/openssl.h"
+#ifdef OPENSSL_IS_BORINGSSL
+#include "rtc_base/boringssl_identity.h"
+#else
+#include "rtc_base/openssl_identity.h"
+#endif
+#include "rtc_base/ssl_fingerprint.h"
+#include "rtc_base/third_party/base64/base64.h"
+
+namespace rtc {
+
+//////////////////////////////////////////////////////////////////////
+// SSLCertificateStats
+//////////////////////////////////////////////////////////////////////
+
+SSLCertificateStats::SSLCertificateStats(
+    std::string&& fingerprint,
+    std::string&& fingerprint_algorithm,
+    std::string&& base64_certificate,
+    std::unique_ptr<SSLCertificateStats> issuer)
+    : fingerprint(std::move(fingerprint)),
+      fingerprint_algorithm(std::move(fingerprint_algorithm)),
+      base64_certificate(std::move(base64_certificate)),
+      issuer(std::move(issuer)) {}
+
+SSLCertificateStats::~SSLCertificateStats() {}
+
+//////////////////////////////////////////////////////////////////////
+// SSLCertificate
+//////////////////////////////////////////////////////////////////////
+
+std::unique_ptr<SSLCertificateStats> SSLCertificate::GetStats() const {
+  // TODO(bemasc): Move this computation to a helper class that caches these
+  // values to reduce CPU use in `StatsCollector::GetStats`. This will require
+  // adding a fast `SSLCertificate::Equals` to detect certificate changes.
+  std::string digest_algorithm;
+  if (!GetSignatureDigestAlgorithm(&digest_algorithm))
+    return nullptr;
+
+  // `SSLFingerprint::Create` can fail if the algorithm returned by
+  // `SSLCertificate::GetSignatureDigestAlgorithm` is not supported by the
+  // implementation of `SSLCertificate::ComputeDigest`. This currently happens
+  // with MD5- and SHA-224-signed certificates when linked to libNSS.
+  std::unique_ptr<SSLFingerprint> ssl_fingerprint =
+      SSLFingerprint::Create(digest_algorithm, *this);
+  if (!ssl_fingerprint)
+    return nullptr;
+  std::string fingerprint = ssl_fingerprint->GetRfc4572Fingerprint();
+
+  Buffer der_buffer;
+  ToDER(&der_buffer);
+  std::string der_base64;
+  Base64::EncodeFromArray(der_buffer.data(), der_buffer.size(), &der_base64);
+
+  return std::make_unique<SSLCertificateStats>(std::move(fingerprint),
+                                               std::move(digest_algorithm),
+                                               std::move(der_base64), nullptr);
+}
+
+//////////////////////////////////////////////////////////////////////
+// SSLCertChain
+//////////////////////////////////////////////////////////////////////
+
+SSLCertChain::SSLCertChain(std::unique_ptr<SSLCertificate> single_cert) {
+  certs_.push_back(std::move(single_cert));
+}
+
+SSLCertChain::SSLCertChain(std::vector<std::unique_ptr<SSLCertificate>> certs)
+    : certs_(std::move(certs)) {}
+
+SSLCertChain::SSLCertChain(SSLCertChain&& rhs) = default;
+
+SSLCertChain& SSLCertChain::operator=(SSLCertChain&&) = default;
+
+SSLCertChain::~SSLCertChain() = default;
+
+std::unique_ptr<SSLCertChain> SSLCertChain::Clone() const {
+  std::vector<std::unique_ptr<SSLCertificate>> new_certs(certs_.size());
+  absl::c_transform(
+      certs_, new_certs.begin(),
+      [](const std::unique_ptr<SSLCertificate>& cert)
+          -> std::unique_ptr<SSLCertificate> { return cert->Clone(); });
+  return std::make_unique<SSLCertChain>(std::move(new_certs));
+}
+
+std::unique_ptr<SSLCertificateStats> SSLCertChain::GetStats() const {
+  // We have a linked list of certificates, starting with the first element of
+  // `certs_` and ending with the last element of `certs_`. The "issuer" of a
+  // certificate is the next certificate in the chain. Stats are produced for
+  // each certificate in the list. Here, the "issuer" is the issuer's stats.
+  std::unique_ptr<SSLCertificateStats> issuer;
+  // The loop runs in reverse so that the `issuer` is known before the
+  // certificate issued by `issuer`.
+  for (ptrdiff_t i = certs_.size() - 1; i >= 0; --i) {
+    std::unique_ptr<SSLCertificateStats> new_stats = certs_[i]->GetStats();
+    if (new_stats) {
+      new_stats->issuer = std::move(issuer);
+    }
+    issuer = std::move(new_stats);
+  }
+  return issuer;
+}
+
+// static
+std::unique_ptr<SSLCertificate> SSLCertificate::FromPEMString(
+    absl::string_view pem_string) {
+#ifdef OPENSSL_IS_BORINGSSL
+  return BoringSSLCertificate::FromPEMString(pem_string);
+#else
+  return OpenSSLCertificate::FromPEMString(pem_string);
+#endif
+}
+
+}  // namespace rtc