Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 641 insertions, 0 deletions

diff --git a/third_party/libwebrtc/webrtc/rtc_base/opensslidentity.cc b/third_party/libwebrtc/webrtc/rtc_base/opensslidentity.cc
new file mode 100644
index 0000000000..85ef176de0
--- /dev/null
+++ b/third_party/libwebrtc/webrtc/rtc_base/opensslidentity.cc
@@ -0,0 +1,641 @@
+/*
+ *  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/opensslidentity.h"
+
+#include <memory>
+
+// Must be included first before openssl headers.
+#include "rtc_base/win32.h"  // NOLINT
+
+#include <openssl/bio.h>
+#include <openssl/bn.h>
+#include <openssl/crypto.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/rsa.h>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/helpers.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/openssl.h"
+#include "rtc_base/openssldigest.h"
+#include "rtc_base/ptr_util.h"
+
+namespace rtc {
+
+// We could have exposed a myriad of parameters for the crypto stuff,
+// but keeping it simple seems best.
+
+// Random bits for certificate serial number
+static const int SERIAL_RAND_BITS = 64;
+
+// Generate a key pair. Caller is responsible for freeing the returned object.
+static EVP_PKEY* MakeKey(const KeyParams& key_params) {
+  RTC_LOG(LS_INFO) << "Making key pair";
+  EVP_PKEY* pkey = EVP_PKEY_new();
+  if (key_params.type() == KT_RSA) {
+    int key_length = key_params.rsa_params().mod_size;
+    BIGNUM* exponent = BN_new();
+    RSA* rsa = RSA_new();
+    if (!pkey || !exponent || !rsa ||
+        !BN_set_word(exponent, key_params.rsa_params().pub_exp) ||
+        !RSA_generate_key_ex(rsa, key_length, exponent, nullptr) ||
+        !EVP_PKEY_assign_RSA(pkey, rsa)) {
+      EVP_PKEY_free(pkey);
+      BN_free(exponent);
+      RSA_free(rsa);
+      RTC_LOG(LS_ERROR) << "Failed to make RSA key pair";
+      return nullptr;
+    }
+    // ownership of rsa struct was assigned, don't free it.
+    BN_free(exponent);
+  } else if (key_params.type() == KT_ECDSA) {
+    if (key_params.ec_curve() == EC_NIST_P256) {
+      EC_KEY* ec_key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
+
+      // Ensure curve name is included when EC key is serialized.
+      // Without this call, OpenSSL versions before 1.1.0 will create
+      // certificates that don't work for TLS.
+      // This is a no-op for BoringSSL and OpenSSL 1.1.0+
+      EC_KEY_set_asn1_flag(ec_key, OPENSSL_EC_NAMED_CURVE);
+
+      if (!pkey || !ec_key || !EC_KEY_generate_key(ec_key) ||
+          !EVP_PKEY_assign_EC_KEY(pkey, ec_key)) {
+        EVP_PKEY_free(pkey);
+        EC_KEY_free(ec_key);
+        RTC_LOG(LS_ERROR) << "Failed to make EC key pair";
+        return nullptr;
+      }
+      // ownership of ec_key struct was assigned, don't free it.
+    } else {
+      // Add generation of any other curves here.
+      EVP_PKEY_free(pkey);
+      RTC_LOG(LS_ERROR) << "ECDSA key requested for unknown curve";
+      return nullptr;
+    }
+  } else {
+    EVP_PKEY_free(pkey);
+    RTC_LOG(LS_ERROR) << "Key type requested not understood";
+    return nullptr;
+  }
+
+  RTC_LOG(LS_INFO) << "Returning key pair";
+  return pkey;
+}
+
+// Generate a self-signed certificate, with the public key from the
+// given key pair. Caller is responsible for freeing the returned object.
+static X509* MakeCertificate(EVP_PKEY* pkey, const SSLIdentityParams& params) {
+  RTC_LOG(LS_INFO) << "Making certificate for " << params.common_name;
+  X509* x509 = nullptr;
+  BIGNUM* serial_number = nullptr;
+  X509_NAME* name = nullptr;
+  time_t epoch_off = 0;  // Time offset since epoch.
+
+  if ((x509 = X509_new()) == nullptr)
+    goto error;
+
+  if (!X509_set_pubkey(x509, pkey))
+    goto error;
+
+  // serial number
+  // temporary reference to serial number inside x509 struct
+  ASN1_INTEGER* asn1_serial_number;
+  if ((serial_number = BN_new()) == nullptr ||
+      !BN_pseudo_rand(serial_number, SERIAL_RAND_BITS, 0, 0) ||
+      (asn1_serial_number = X509_get_serialNumber(x509)) == nullptr ||
+      !BN_to_ASN1_INTEGER(serial_number, asn1_serial_number))
+    goto error;
+
+  if (!X509_set_version(x509, 2L))  // version 3
+    goto error;
+
+  // There are a lot of possible components for the name entries. In
+  // our P2P SSL mode however, the certificates are pre-exchanged
+  // (through the secure XMPP channel), and so the certificate
+  // identification is arbitrary. It can't be empty, so we set some
+  // arbitrary common_name. Note that this certificate goes out in
+  // clear during SSL negotiation, so there may be a privacy issue in
+  // putting anything recognizable here.
+  if ((name = X509_NAME_new()) == nullptr ||
+      !X509_NAME_add_entry_by_NID(name, NID_commonName, MBSTRING_UTF8,
+                                  (unsigned char*)params.common_name.c_str(),
+                                  -1, -1, 0) ||
+      !X509_set_subject_name(x509, name) || !X509_set_issuer_name(x509, name))
+    goto error;
+
+  if (!X509_time_adj(X509_get_notBefore(x509), params.not_before, &epoch_off) ||
+      !X509_time_adj(X509_get_notAfter(x509), params.not_after, &epoch_off))
+    goto error;
+
+  if (!X509_sign(x509, pkey, EVP_sha256()))
+    goto error;
+
+  BN_free(serial_number);
+  X509_NAME_free(name);
+  RTC_LOG(LS_INFO) << "Returning certificate";
+  return x509;
+
+error:
+  BN_free(serial_number);
+  X509_NAME_free(name);
+  X509_free(x509);
+  return nullptr;
+}
+
+// This dumps the SSL error stack to the log.
+static void LogSSLErrors(const std::string& prefix) {
+  char error_buf[200];
+  unsigned long err;
+
+  while ((err = ERR_get_error()) != 0) {
+    ERR_error_string_n(err, error_buf, sizeof(error_buf));
+    RTC_LOG(LS_ERROR) << prefix << ": " << error_buf << "\n";
+  }
+}
+
+OpenSSLKeyPair* OpenSSLKeyPair::Generate(const KeyParams& key_params) {
+  EVP_PKEY* pkey = MakeKey(key_params);
+  if (!pkey) {
+    LogSSLErrors("Generating key pair");
+    return nullptr;
+  }
+  return new OpenSSLKeyPair(pkey);
+}
+
+OpenSSLKeyPair* OpenSSLKeyPair::FromPrivateKeyPEMString(
+    const std::string& pem_string) {
+  BIO* bio = BIO_new_mem_buf(const_cast<char*>(pem_string.c_str()), -1);
+  if (!bio) {
+    RTC_LOG(LS_ERROR) << "Failed to create a new BIO buffer.";
+    return nullptr;
+  }
+  BIO_set_mem_eof_return(bio, 0);
+  EVP_PKEY* pkey =
+      PEM_read_bio_PrivateKey(bio, nullptr, nullptr, const_cast<char*>("\0"));
+  BIO_free(bio);  // Frees the BIO, but not the pointed-to string.
+  if (!pkey) {
+    RTC_LOG(LS_ERROR) << "Failed to create the private key from PEM string.";
+    return nullptr;
+  }
+  if (EVP_PKEY_missing_parameters(pkey) != 0) {
+    RTC_LOG(LS_ERROR)
+        << "The resulting key pair is missing public key parameters.";
+    EVP_PKEY_free(pkey);
+    return nullptr;
+  }
+  return new OpenSSLKeyPair(pkey);
+}
+
+OpenSSLKeyPair::~OpenSSLKeyPair() {
+  EVP_PKEY_free(pkey_);
+}
+
+OpenSSLKeyPair* OpenSSLKeyPair::GetReference() {
+  AddReference();
+  return new OpenSSLKeyPair(pkey_);
+}
+
+void OpenSSLKeyPair::AddReference() {
+#if defined(OPENSSL_IS_BORINGSSL)
+  EVP_PKEY_up_ref(pkey_);
+#else
+  CRYPTO_add(&pkey_->references, 1, CRYPTO_LOCK_EVP_PKEY);
+#endif
+}
+
+std::string OpenSSLKeyPair::PrivateKeyToPEMString() const {
+  BIO* temp_memory_bio = BIO_new(BIO_s_mem());
+  if (!temp_memory_bio) {
+    RTC_LOG_F(LS_ERROR) << "Failed to allocate temporary memory bio";
+    RTC_NOTREACHED();
+    return "";
+  }
+  if (!PEM_write_bio_PrivateKey(temp_memory_bio, pkey_, nullptr, nullptr, 0,
+                                nullptr, nullptr)) {
+    RTC_LOG_F(LS_ERROR) << "Failed to write private key";
+    BIO_free(temp_memory_bio);
+    RTC_NOTREACHED();
+    return "";
+  }
+  BIO_write(temp_memory_bio, "\0", 1);
+  char* buffer;
+  BIO_get_mem_data(temp_memory_bio, &buffer);
+  std::string priv_key_str = buffer;
+  BIO_free(temp_memory_bio);
+  return priv_key_str;
+}
+
+std::string OpenSSLKeyPair::PublicKeyToPEMString() const {
+  BIO* temp_memory_bio = BIO_new(BIO_s_mem());
+  if (!temp_memory_bio) {
+    RTC_LOG_F(LS_ERROR) << "Failed to allocate temporary memory bio";
+    RTC_NOTREACHED();
+    return "";
+  }
+  if (!PEM_write_bio_PUBKEY(temp_memory_bio, pkey_)) {
+    RTC_LOG_F(LS_ERROR) << "Failed to write public key";
+    BIO_free(temp_memory_bio);
+    RTC_NOTREACHED();
+    return "";
+  }
+  BIO_write(temp_memory_bio, "\0", 1);
+  char* buffer;
+  BIO_get_mem_data(temp_memory_bio, &buffer);
+  std::string pub_key_str = buffer;
+  BIO_free(temp_memory_bio);
+  return pub_key_str;
+}
+
+bool OpenSSLKeyPair::operator==(const OpenSSLKeyPair& other) const {
+  return EVP_PKEY_cmp(this->pkey_, other.pkey_) == 1;
+}
+
+bool OpenSSLKeyPair::operator!=(const OpenSSLKeyPair& other) const {
+  return !(*this == other);
+}
+
+#if !defined(NDEBUG)
+// Print a certificate to the log, for debugging.
+static void PrintCert(X509* x509) {
+  BIO* temp_memory_bio = BIO_new(BIO_s_mem());
+  if (!temp_memory_bio) {
+    RTC_LOG_F(LS_ERROR) << "Failed to allocate temporary memory bio";
+    return;
+  }
+  X509_print_ex(temp_memory_bio, x509, XN_FLAG_SEP_CPLUS_SPC, 0);
+  BIO_write(temp_memory_bio, "\0", 1);
+  char* buffer;
+  BIO_get_mem_data(temp_memory_bio, &buffer);
+  RTC_LOG(LS_VERBOSE) << buffer;
+  BIO_free(temp_memory_bio);
+}
+#endif
+
+OpenSSLCertificate::OpenSSLCertificate(X509* x509) : x509_(x509) {
+  AddReference();
+}
+
+OpenSSLCertificate* OpenSSLCertificate::Generate(
+    OpenSSLKeyPair* key_pair,
+    const SSLIdentityParams& params) {
+  SSLIdentityParams actual_params(params);
+  if (actual_params.common_name.empty()) {
+    // Use a random string, arbitrarily 8chars long.
+    actual_params.common_name = CreateRandomString(8);
+  }
+  X509* x509 = MakeCertificate(key_pair->pkey(), actual_params);
+  if (!x509) {
+    LogSSLErrors("Generating certificate");
+    return nullptr;
+  }
+#if !defined(NDEBUG)
+  PrintCert(x509);
+#endif
+  OpenSSLCertificate* ret = new OpenSSLCertificate(x509);
+  X509_free(x509);
+  return ret;
+}
+
+OpenSSLCertificate* OpenSSLCertificate::FromPEMString(
+    const std::string& pem_string) {
+  BIO* bio = BIO_new_mem_buf(const_cast<char*>(pem_string.c_str()), -1);
+  if (!bio)
+    return nullptr;
+  BIO_set_mem_eof_return(bio, 0);
+  X509* x509 =
+      PEM_read_bio_X509(bio, nullptr, nullptr, const_cast<char*>("\0"));
+  BIO_free(bio);  // Frees the BIO, but not the pointed-to string.
+
+  if (!x509)
+    return nullptr;
+
+  OpenSSLCertificate* ret = new OpenSSLCertificate(x509);
+  X509_free(x509);
+  return ret;
+}
+
+// NOTE: This implementation only functions correctly after InitializeSSL
+// and before CleanupSSL.
+bool OpenSSLCertificate::GetSignatureDigestAlgorithm(
+    std::string* algorithm) const {
+  int nid = OBJ_obj2nid(x509_->sig_alg->algorithm);
+  switch (nid) {
+    case NID_md5WithRSA:
+    case NID_md5WithRSAEncryption:
+      *algorithm = DIGEST_MD5;
+      break;
+    case NID_ecdsa_with_SHA1:
+    case NID_dsaWithSHA1:
+    case NID_dsaWithSHA1_2:
+    case NID_sha1WithRSA:
+    case NID_sha1WithRSAEncryption:
+      *algorithm = DIGEST_SHA_1;
+      break;
+    case NID_ecdsa_with_SHA224:
+    case NID_sha224WithRSAEncryption:
+    case NID_dsa_with_SHA224:
+      *algorithm = DIGEST_SHA_224;
+      break;
+    case NID_ecdsa_with_SHA256:
+    case NID_sha256WithRSAEncryption:
+    case NID_dsa_with_SHA256:
+      *algorithm = DIGEST_SHA_256;
+      break;
+    case NID_ecdsa_with_SHA384:
+    case NID_sha384WithRSAEncryption:
+      *algorithm = DIGEST_SHA_384;
+      break;
+    case NID_ecdsa_with_SHA512:
+    case NID_sha512WithRSAEncryption:
+      *algorithm = DIGEST_SHA_512;
+      break;
+    default:
+      // Unknown algorithm.  There are several unhandled options that are less
+      // common and more complex.
+      RTC_LOG(LS_ERROR) << "Unknown signature algorithm NID: " << nid;
+      algorithm->clear();
+      return false;
+  }
+  return true;
+}
+
+std::unique_ptr<SSLCertChain> OpenSSLCertificate::GetChain() const {
+  return nullptr;
+}
+
+bool OpenSSLCertificate::ComputeDigest(const std::string& algorithm,
+                                       unsigned char* digest,
+                                       size_t size,
+                                       size_t* length) const {
+  return ComputeDigest(x509_, algorithm, digest, size, length);
+}
+
+bool OpenSSLCertificate::ComputeDigest(const X509* x509,
+                                       const std::string& algorithm,
+                                       unsigned char* digest,
+                                       size_t size,
+                                       size_t* length) {
+  const EVP_MD* md;
+  unsigned int n;
+
+  if (!OpenSSLDigest::GetDigestEVP(algorithm, &md))
+    return false;
+
+  if (size < static_cast<size_t>(EVP_MD_size(md)))
+    return false;
+
+  X509_digest(x509, md, digest, &n);
+
+  *length = n;
+
+  return true;
+}
+
+OpenSSLCertificate::~OpenSSLCertificate() {
+  X509_free(x509_);
+}
+
+OpenSSLCertificate* OpenSSLCertificate::GetReference() const {
+  return new OpenSSLCertificate(x509_);
+}
+
+std::string OpenSSLCertificate::ToPEMString() const {
+  BIO* bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    FATAL() << "unreachable code";
+  }
+  if (!PEM_write_bio_X509(bio, x509_)) {
+    BIO_free(bio);
+    FATAL() << "unreachable code";
+  }
+  BIO_write(bio, "\0", 1);
+  char* buffer;
+  BIO_get_mem_data(bio, &buffer);
+  std::string ret(buffer);
+  BIO_free(bio);
+  return ret;
+}
+
+void OpenSSLCertificate::ToDER(Buffer* der_buffer) const {
+  // In case of failure, make sure to leave the buffer empty.
+  der_buffer->SetSize(0);
+
+  // Calculates the DER representation of the certificate, from scratch.
+  BIO* bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    FATAL() << "unreachable code";
+  }
+  if (!i2d_X509_bio(bio, x509_)) {
+    BIO_free(bio);
+    FATAL() << "unreachable code";
+  }
+  char* data;
+  size_t length = BIO_get_mem_data(bio, &data);
+  der_buffer->SetData(data, length);
+  BIO_free(bio);
+}
+
+void OpenSSLCertificate::AddReference() const {
+  RTC_DCHECK(x509_ != nullptr);
+#if defined(OPENSSL_IS_BORINGSSL)
+  X509_up_ref(x509_);
+#else
+  CRYPTO_add(&x509_->references, 1, CRYPTO_LOCK_X509);
+#endif
+}
+
+bool OpenSSLCertificate::operator==(const OpenSSLCertificate& other) const {
+  return X509_cmp(x509_, other.x509_) == 0;
+}
+
+bool OpenSSLCertificate::operator!=(const OpenSSLCertificate& other) const {
+  return !(*this == other);
+}
+
+// Documented in sslidentity.h.
+int64_t OpenSSLCertificate::CertificateExpirationTime() const {
+  ASN1_TIME* expire_time = X509_get_notAfter(x509_);
+  bool long_format;
+
+  if (expire_time->type == V_ASN1_UTCTIME) {
+    long_format = false;
+  } else if (expire_time->type == V_ASN1_GENERALIZEDTIME) {
+    long_format = true;
+  } else {
+    return -1;
+  }
+
+  return ASN1TimeToSec(expire_time->data, expire_time->length, long_format);
+}
+
+OpenSSLIdentity::OpenSSLIdentity(
+    std::unique_ptr<OpenSSLKeyPair> key_pair,
+    std::unique_ptr<OpenSSLCertificate> certificate)
+    : key_pair_(std::move(key_pair)) {
+  RTC_DCHECK(key_pair_ != nullptr);
+  RTC_DCHECK(certificate != nullptr);
+  std::vector<std::unique_ptr<SSLCertificate>> certs;
+  certs.push_back(std::move(certificate));
+  cert_chain_.reset(new SSLCertChain(std::move(certs)));
+}
+
+OpenSSLIdentity::OpenSSLIdentity(std::unique_ptr<OpenSSLKeyPair> key_pair,
+                                 std::unique_ptr<SSLCertChain> cert_chain)
+    : key_pair_(std::move(key_pair)), cert_chain_(std::move(cert_chain)) {
+  RTC_DCHECK(key_pair_ != nullptr);
+  RTC_DCHECK(cert_chain_ != nullptr);
+}
+
+OpenSSLIdentity::~OpenSSLIdentity() = default;
+
+OpenSSLIdentity* OpenSSLIdentity::GenerateInternal(
+    const SSLIdentityParams& params) {
+  std::unique_ptr<OpenSSLKeyPair> key_pair(
+      OpenSSLKeyPair::Generate(params.key_params));
+  if (key_pair) {
+    std::unique_ptr<OpenSSLCertificate> certificate(
+        OpenSSLCertificate::Generate(key_pair.get(), params));
+    if (certificate != nullptr)
+      return new OpenSSLIdentity(std::move(key_pair), std::move(certificate));
+  }
+  RTC_LOG(LS_INFO) << "Identity generation failed";
+  return nullptr;
+}
+
+OpenSSLIdentity* OpenSSLIdentity::GenerateWithExpiration(
+    const std::string& common_name,
+    const KeyParams& key_params,
+    time_t certificate_lifetime) {
+  SSLIdentityParams params;
+  params.key_params = key_params;
+  params.common_name = common_name;
+  time_t now = time(nullptr);
+  params.not_before = now + kCertificateWindowInSeconds;
+  params.not_after = now + certificate_lifetime;
+  if (params.not_before > params.not_after)
+    return nullptr;
+  return GenerateInternal(params);
+}
+
+OpenSSLIdentity* OpenSSLIdentity::GenerateForTest(
+    const SSLIdentityParams& params) {
+  return GenerateInternal(params);
+}
+
+SSLIdentity* OpenSSLIdentity::FromPEMStrings(const std::string& private_key,
+                                             const std::string& certificate) {
+  std::unique_ptr<OpenSSLCertificate> cert(
+      OpenSSLCertificate::FromPEMString(certificate));
+  if (!cert) {
+    RTC_LOG(LS_ERROR) << "Failed to create OpenSSLCertificate from PEM string.";
+    return nullptr;
+  }
+
+  std::unique_ptr<OpenSSLKeyPair> key_pair(
+      OpenSSLKeyPair::FromPrivateKeyPEMString(private_key));
+  if (!key_pair) {
+    RTC_LOG(LS_ERROR) << "Failed to create key pair from PEM string.";
+    return nullptr;
+  }
+
+  return new OpenSSLIdentity(std::move(key_pair), std::move(cert));
+}
+
+SSLIdentity* OpenSSLIdentity::FromPEMChainStrings(
+    const std::string& private_key,
+    const std::string& certificate_chain) {
+  BIO* bio =
+      BIO_new_mem_buf(certificate_chain.data(), certificate_chain.size());
+  if (!bio)
+    return nullptr;
+  BIO_set_mem_eof_return(bio, 0);
+  std::vector<std::unique_ptr<SSLCertificate>> certs;
+  while (true) {
+    X509* x509 =
+        PEM_read_bio_X509(bio, nullptr, nullptr, const_cast<char*>("\0"));
+    if (x509 == nullptr) {
+      uint32_t err = ERR_peek_error();
+      if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
+          ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
+        break;
+      }
+      RTC_LOG(LS_ERROR) << "Failed to parse certificate from PEM string.";
+      BIO_free(bio);
+      return nullptr;
+    }
+    certs.emplace_back(new OpenSSLCertificate(x509));
+    X509_free(x509);
+  }
+  BIO_free(bio);
+  if (certs.empty()) {
+    RTC_LOG(LS_ERROR) << "Found no certificates in PEM string.";
+    return nullptr;
+  }
+
+  std::unique_ptr<OpenSSLKeyPair> key_pair(
+      OpenSSLKeyPair::FromPrivateKeyPEMString(private_key));
+  if (!key_pair) {
+    RTC_LOG(LS_ERROR) << "Failed to create key pair from PEM string.";
+    return nullptr;
+  }
+
+  return new OpenSSLIdentity(std::move(key_pair),
+                             MakeUnique<SSLCertChain>(std::move(certs)));
+}
+
+const OpenSSLCertificate& OpenSSLIdentity::certificate() const {
+  return *static_cast<const OpenSSLCertificate*>(&cert_chain_->Get(0));
+}
+
+OpenSSLIdentity* OpenSSLIdentity::GetReference() const {
+  return new OpenSSLIdentity(WrapUnique(key_pair_->GetReference()),
+                             WrapUnique(certificate().GetReference()));
+}
+
+bool OpenSSLIdentity::ConfigureIdentity(SSL_CTX* ctx) {
+  // 1 is the documented success return code.
+  const OpenSSLCertificate* cert = &certificate();
+  if (SSL_CTX_use_certificate(ctx, cert->x509()) != 1 ||
+      SSL_CTX_use_PrivateKey(ctx, key_pair_->pkey()) != 1) {
+    LogSSLErrors("Configuring key and certificate");
+    return false;
+  }
+  // If a chain is available, use it.
+  for (size_t i = 1; i < cert_chain_->GetSize(); ++i) {
+    cert = static_cast<const OpenSSLCertificate*>(&cert_chain_->Get(i));
+    if (SSL_CTX_add1_chain_cert(ctx, cert->x509()) != 1) {
+      LogSSLErrors("Configuring intermediate certificate");
+      return false;
+    }
+  }
+
+  return true;
+}
+
+std::string OpenSSLIdentity::PrivateKeyToPEMString() const {
+  return key_pair_->PrivateKeyToPEMString();
+}
+
+std::string OpenSSLIdentity::PublicKeyToPEMString() const {
+  return key_pair_->PublicKeyToPEMString();
+}
+
+bool OpenSSLIdentity::operator==(const OpenSSLIdentity& other) const {
+  return *this->key_pair_ == *other.key_pair_ &&
+         this->certificate() == other.certificate();
+}
+
+bool OpenSSLIdentity::operator!=(const OpenSSLIdentity& other) const {
+  return !(*this == other);
+}
+
+}  // namespace rtc