/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Yingdi Yu <yingdi@cs.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_SEC_TPM_OSX_HPP
#define NDN_SEC_TPM_OSX_HPP

#include "../common.hpp"
#include "sec-tpm.hpp"

namespace ndn
{
  
class SecTpmOsx : public SecTpm {
public:
  struct Error : public SecTpm::Error { Error(const std::string& what) : SecTpm::Error(what) {} };

  /**
   * constructor of OSXKeyChainTpm
   * @param keychainName the name of keychain
   */
  SecTpmOsx();

  /**
   * destructor of OSXKeyChainTpm
   */    
  virtual 
  ~SecTpmOsx();


  // From TrustedPlatformModule
  virtual void 
  generateKeyPairInTpm(const Name& keyName, KeyType keyType, int keySize);

  /**
   * Delete a key pair of asymmetric keys.
   * @param keyName The name of the key pair.
   */
  virtual void
  deleteKeyPairInTpm(const Name& keyName);

  virtual ptr_lib::shared_ptr<PublicKey> 
  getPublicKeyFromTpm(const Name& keyName);
  
  virtual Block
  signInTpm(const uint8_t* data, size_t dataLength, const Name& keyName, DigestAlgorithm digestAlgorithm);
  
  /**
   * Decrypt data.
   * @param keyName The name of the decrypting key.
   * @param data The byte to be decrypted.
   * @param dataLength the length of data.
   * @param isSymmetric If true symmetric encryption is used, otherwise asymmetric decryption is used.
   * @return The decrypted data.
   */
  virtual ConstBufferPtr 
  decryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);

  /**
   * Encrypt data.
   * @param keyName The name of the encrypting key.
   * @param data The byte to be encrypted.
   * @param dataLength the length of data.
   * @param isSymmetric If true symmetric encryption is used, otherwise asymmetric decryption is used.
   * @return The encrypted data.
   */
  virtual ConstBufferPtr
  encryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);

  /**
   * Generate a symmetric key.
   * @param keyName The name of the key.
   * @param keyType The type of the key, e.g. KEY_TYPE_AES.
   * @param keySize The size of the key.
   */
  virtual void 
  generateSymmetricKeyInTpm(const Name& keyName, KeyType keyType, int keySize);

  /**
   * Check if a particular key exists.
   * @param keyName The name of the key.
   * @param keyClass The class of the key, e.g. KEY_CLASS_PUBLIC, KEY_CLASS_PRIVATE, or KEY_CLASS_SYMMETRIC.
   * @return True if the key exists, otherwise false.
   */
  virtual bool
  doesKeyExistInTpm(const Name& keyName, KeyClass keyClass); 

  virtual bool
  generateRandomBlock(uint8_t* res, size_t size); 


  ////////////////////////////////////////////////////////////////////////////////////
  // OSX-specifics
  ////////////////////////////////////////////////////////////////////////////////////
  
  /**
   * configure ACL of a particular key
   * @param keyName the name of key
   * @param keyClass the class of key, e.g. Private Key
   * @param acl the new acl of the key
   * @param appPath the absolute path to the application
   * @returns true if setting succeeds
   */
  bool 
  setACL(const Name& keyName, KeyClass keyClass, int acl, const std::string& appPath);

protected:
  /******************************
   * From TrustedPlatformModule *
   ******************************/
  virtual ConstBufferPtr
  exportPrivateKeyPkcs1FromTpm(const Name& keyName);

  virtual bool
  importPrivateKeyPkcs1IntoTpm(const Name& keyName, const uint8_t* buf, size_t size);

  virtual bool
  importPublicKeyPkcs1IntoTpm(const Name& keyName, const uint8_t* buf, size_t size);
  
private:
  class Impl;
  shared_ptr<Impl> m_impl;
};
  
} // namespace ndn

#endif // NDN_SEC_TPM_OSX_HPP