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78 lines
3.1 KiB
C
78 lines
3.1 KiB
C
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/*
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* Copyright (c) 2015, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-ctr
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* @{
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*
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* \file
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* Implementation of the cc2538 AES-CTR driver
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*/
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#include "contiki.h"
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#include "dev/rom-util.h"
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#include "dev/ctr.h"
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#include <stdbool.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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uint8_t
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ctr_crypt_start(uint8_t encrypt, uint8_t key_area, const void *nonce,
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const void *ictr, uint8_t ctr_len, const void *mdata_in,
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void *mdata_out, uint16_t mdata_len, struct process *process)
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{
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uint32_t ctrl;
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uint32_t iv[AES_IV_LEN / sizeof(uint32_t)];
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uint8_t nonce_len;
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/* Program AES-CTR crypto operation */
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ctrl = (((ctr_len >> 2) - 1) << AES_AES_CTRL_CTR_WIDTH_S) | /* CTR width */
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AES_AES_CTRL_CTR | /* CTR */
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(encrypt ? AES_AES_CTRL_DIRECTION_ENCRYPT : 0); /* En/decryption */
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/* Prepare the crypto initialization vector */
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nonce_len = AES_IV_LEN - ctr_len;
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/* Nonce */
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rom_util_memcpy(&((uint8_t *)iv)[0], nonce, nonce_len);
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/* Initial counter */
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rom_util_memcpy(&((uint8_t *)iv)[nonce_len], ictr, ctr_len);
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return aes_auth_crypt_start(ctrl, key_area, iv, NULL, 0,
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mdata_in, mdata_out, mdata_len, process);
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}
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/*---------------------------------------------------------------------------*/
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int8_t
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ctr_crypt_check_status(void)
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{
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return aes_auth_crypt_check_status() ? aes_auth_crypt_get_result(NULL, NULL) :
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CRYPTO_PENDING;
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}
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/** @} */
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