/**
 * @author: Jeff Thompson
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_KEY_H
#define NDN_KEY_H

#include "name.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
  ndn_KeyLocatorType_KEY = 1,
  ndn_KeyLocatorType_CERTIFICATE = 2,
  ndn_KeyLocatorType_KEYNAME = 3
} ndn_KeyLocatorType;

typedef enum {
  ndn_KeyNameType_PUBLISHER_PUBLIC_KEY_DIGEST = 1,
  ndn_KeyNameType_PUBLISHER_CERTIFICATE_DIGEST = 2,
  ndn_KeyNameType_PUBLISHER_ISSUER_KEY_DIGEST = 3,
  ndn_KeyNameType_PUBLISHER_ISSUER_CERTIFICATE_DIGEST = 4
} ndn_KeyNameType;

/**
 * An ndn_KeyLocator holds the type of key locator and related data.
 */
struct ndn_KeyLocator {
  ndn_KeyLocatorType type;     /**< -1 for none */
  unsigned char *keyData;      /**< A pointer to a pre-allocated buffer for the key data as follows:
    *   If type is ndn_KeyLocatorType_KEY, the key data.
    *   If type is ndn_KeyLocatorType_CERTIFICATE, the certificate data. 
    *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_PUBLIC_KEY_DIGEST, the publisher public key digest. 
    *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_CERTIFICATE_DIGEST, the publisher certificate digest. 
    *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_ISSUER_KEY_DIGEST, the publisher issuer key digest. 
    *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_ISSUER_CERTIFICATE_DIGEST, the publisher issuer certificate digest. 
    */
  unsigned int keyDataLength;  /**< The length of keyData. */
  struct ndn_Name keyName;     /**< The key name (only used if type is ndn_KeyLocatorType_KEYNAME.) */
  ndn_KeyNameType keyNameType; /**< The type of data for keyName, -1 for none. (only used if type is ndn_KeyLocatorType_KEYNAME.) */
};

/**
 * Initialize an ndn_KeyLocator struct with the pre-allocated nameComponents, and defaults for all the values.
 * @param self A pointer to the ndn_KeyLocator struct.
 * @param keyNameComponents The pre-allocated array of ndn_NameComponent.
 * @param maxKeyNameComponents The number of elements in the allocated keyNameComponents array.
 */
static inline void ndn_KeyLocator_init
  (struct ndn_KeyLocator *self, struct ndn_NameComponent *keyNameComponents, unsigned int maxKeyNameComponents) {
  self->type = (ndn_KeyLocatorType)-1;
  self->keyData = 0;
  self->keyDataLength = 0;
  ndn_Name_init(&self->keyName, keyNameComponents, maxKeyNameComponents);
  self->keyNameType = (ndn_KeyNameType)-1;
}

#ifdef __cplusplus
}
#endif

#endif