tc_ccm_mode.h

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/* ccm_mode.h - TinyCrypt interface to a CCM mode implementation */

/*
 *  Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *    - Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *
 *    - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *    - Neither the name of Intel Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */

#ifndef __TC_CCM_MODE_H__
#define __TC_CCM_MODE_H__

#include "tc_aes.h"
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/* max additional authenticated size in bytes: 2^16 - 2^8 = 65280 */
#define TC_CCM_AAD_MAX_BYTES 0xff00

/* max message size in bytes: 2^(8L) = 2^16 = 65536 */
#define TC_CCM_PAYLOAD_MAX_BYTES 0x10000

/* struct tc_ccm_mode_struct represents the state of a CCM computation */
typedef struct tc_ccm_mode_struct {
  TCAesKeySched_t sched; /* AES key schedule */
  uint8_t *nonce; /* nonce required by CCM */
  unsigned int mlen; /* mac length in bytes (parameter t in SP-800 38C) */
} *TCCcmMode_t;

int tc_ccm_config(TCCcmMode_t c, TCAesKeySched_t sched, uint8_t *nonce,
      unsigned int nlen, unsigned int mlen);

int tc_ccm_generation_encryption(uint8_t *out, unsigned int olen,
           const uint8_t *associated_data,
           unsigned int alen, const uint8_t *payload,
         unsigned int plen, TCCcmMode_t c);

int tc_ccm_decryption_verification(uint8_t *out, unsigned int olen,
           const uint8_t *associated_data,
           unsigned int alen, const uint8_t *payload, unsigned int plen,
           TCCcmMode_t c);

#ifdef __cplusplus
}
#endif

#endif /* __TC_CCM_MODE_H__ */