

/**
 * @file
 *   This file implements the generating pskc function.
 */

#ifndef OTBR_UTILS_PSKC_HPP_
#define OTBR_UTILS_PSKC_HPP_

#include "openthread-br/config.h"

#define OT_EXTENDED_PAN_ID_LENGTH 8
#define OT_ITERATION_COUNTS 16384
#define OT_PASSPHRASE_MAX_LENGTH 255
#define OT_PBKDF2_SALT_MAX_LENGTH 30
#define OT_PSKC_LENGTH 16

#include <stdint.h>
#include <string.h>

#include <mbedtls/cmac.h>

namespace otbr {
namespace Psk {

enum
{
    kPskcStatus_Ok              = 0,
    kPskcStatus_InvalidArgument = 1
};

class Pskc
{
public:
    /**
     * This method computes the PSKc.
     *
     * @param[in] aExtPanId     A pointer to extended PAN ID.
     * @param[in] aNetworkName  A pointer to network name.
     * @param[in] aPassphrase   A pointer to passphrase.
     *
     * @returns The pointer to PSKc value.
     *
     */
    const uint8_t *ComputePskc(const uint8_t *aExtPanId, const char *aNetworkName, const char *aPassphrase);

private:
    void SetSalt(const uint8_t *aExtPanId, const char *aNetworkName);

    char     mSalt[OT_PBKDF2_SALT_MAX_LENGTH];
    uint16_t mSaltLen;
    uint8_t  mPskc[OT_PSKC_LENGTH];
};

} // namespace Psk
} // namespace otbr

#endif // OTBR_UTILS_PSKC_HPP_
