RTCCertificate::Expires() and ::HasExpired() implemented

webrtc/base/sslidentity.h

 /*
  *  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.
  */
 
@@ skipping 52 matching lines @@
   // Gets the name of the digest algorithm that was used to compute this
   // certificate's signature.
   virtual bool GetSignatureDigestAlgorithm(std::string* algorithm) const = 0;
 
   // Compute the digest of the certificate given algorithm
   virtual bool ComputeDigest(const std::string& algorithm,
                              unsigned char* digest,
                              size_t size,
                              size_t* length) const = 0;
 
-  // Returns the time in seconds relative to epoch.
+  // Returns the time in seconds relative to epoch, 1970-01-01T00:00:00Z (UTC),
+  // or -1 if an expiration time could not be retrieved.
   virtual int64_t CertificateExpirationTime() const = 0;
 };
 
 // SSLCertChain is a simple wrapper for a vector of SSLCertificates. It serves
 // primarily to ensure proper memory management (especially deletion) of the
 // SSLCertificate pointers.
 class SSLCertChain {
  public:
   // These constructors copy the provided SSLCertificate(s), so the caller
   // retains ownership.
@@ skipping 142 matching lines @@
 // |s| is not 0-terminated; its char count is defined by |length|.
 int64_t ASN1TimeToSec(const unsigned char* s, size_t length, bool long_format);
 
 extern const char kPemTypeCertificate[];
 extern const char kPemTypeRsaPrivateKey[];
 extern const char kPemTypeEcPrivateKey[];
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_SSLIDENTITY_H_