/*
 *  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.
 */

#ifndef RTC_BASE_OPENSSLCERTIFICATE_H_
#define RTC_BASE_OPENSSLCERTIFICATE_H_

#include <openssl/evp.h>
#include <openssl/x509.h>

#include <memory>
#include <string>

#include "rtc_base/checks.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/sslcertificate.h"
#include "rtc_base/sslidentity.h"

typedef struct ssl_ctx_st SSL_CTX;

namespace rtc {

class OpenSSLKeyPair;

// OpenSSLCertificate encapsulates an OpenSSL X509* certificate object,
// which is also reference counted inside the OpenSSL library.
class OpenSSLCertificate : public SSLCertificate {
 public:
  // X509 object has its reference count incremented. So the caller and
  // OpenSSLCertificate share ownership.
  explicit OpenSSLCertificate(X509* x509);

  static OpenSSLCertificate* Generate(OpenSSLKeyPair* key_pair,
                                      const SSLIdentityParams& params);
  static OpenSSLCertificate* FromPEMString(const std::string& pem_string);

  ~OpenSSLCertificate() override;

  OpenSSLCertificate* GetReference() const override;

  X509* x509() const { return x509_; }

  std::string ToPEMString() const override;
  void ToDER(Buffer* der_buffer) const override;
  bool operator==(const OpenSSLCertificate& other) const;
  bool operator!=(const OpenSSLCertificate& other) const;

  // Compute the digest of the certificate given algorithm
  bool ComputeDigest(const std::string& algorithm,
                     unsigned char* digest,
                     size_t size,
                     size_t* length) const override;

  // Compute the digest of a certificate as an X509 *
  static bool ComputeDigest(const X509* x509,
                            const std::string& algorithm,
                            unsigned char* digest,
                            size_t size,
                            size_t* length);

  bool GetSignatureDigestAlgorithm(std::string* algorithm) const override;

  int64_t CertificateExpirationTime() const override;

 private:
  void AddReference() const;

  X509* x509_;  // NOT OWNED
  RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLCertificate);
};

}  // namespace rtc

#endif  // RTC_BASE_OPENSSLCERTIFICATE_H_