deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

cc2538: Add crypto drivers and examples for AES-CCM and SHA-256

Browse source 
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
This commit is contained in:
Benoît Thébaudeau 2015-05-15 19:52:08 +02:00
parent c03536f04e
commit 117dc4e5e3
16 changed files with 2363 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

118
cpu/cc2538/dev/aes.c Normal file
View file

@ -0,0 +1,118 @@
/*
* Original file:
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Port to Contiki:
* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc2538-aes
* @{
*
* \file
* Implementation of the cc2538 AES driver
*/
#include "contiki.h"
#include "dev/rom-util.h"
#include "dev/aes.h"
#include "reg.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
uint8_t
aes_load_key(const void *key, uint8_t key_area)
{
uint32_t aligned_key[4];
/* The key address needs to be 4-byte aligned */
rom_util_memcpy(aligned_key, key, sizeof(aligned_key));
/* Workaround for AES registers not retained after PM2 */
REG(AES_CTRL_INT_CFG) = AES_CTRL_INT_CFG_LEVEL;
REG(AES_CTRL_INT_EN) = AES_CTRL_INT_EN_DMA_IN_DONE |
AES_CTRL_INT_EN_RESULT_AV;
/* Configure master control module */
REG(AES_CTRL_ALG_SEL) = AES_CTRL_ALG_SEL_KEYSTORE;
/* Clear any outstanding events */
REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_DMA_IN_DONE |
AES_CTRL_INT_CLR_RESULT_AV;
/* Configure key store module (area, size): 128-bit key size */
REG(AES_KEY_STORE_SIZE) = (REG(AES_KEY_STORE_SIZE) &
~AES_KEY_STORE_SIZE_KEY_SIZE_M) |
AES_KEY_STORE_SIZE_KEY_SIZE_128;
/* Enable keys to write (e.g. Key 0) */
REG(AES_KEY_STORE_WRITE_AREA) = 0x00000001 << key_area;
/* Configure DMAC
* Enable DMA channel 0 */
REG(AES_DMAC_CH0_CTRL) = AES_DMAC_CH_CTRL_EN;
/* Base address of the key in ext. memory */
REG(AES_DMAC_CH0_EXTADDR) = (uint32_t)aligned_key;
/* Total key length in bytes (e.g. 16 for 1 x 128-bit key) */
REG(AES_DMAC_CH0_DMALENGTH) = (REG(AES_DMAC_CH0_DMALENGTH) &
~AES_DMAC_CH_DMALENGTH_DMALEN_M) |
(0x10 << AES_DMAC_CH_DMALENGTH_DMALEN_S);
/* Wait for operation to complete */
while(!(REG(AES_CTRL_INT_STAT) & AES_CTRL_INT_STAT_RESULT_AV));
/* Check for absence of errors in DMA and key store */
if(REG(AES_CTRL_INT_STAT) & AES_CTRL_INT_STAT_DMA_BUS_ERR) {
REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_DMA_BUS_ERR;
return CRYPTO_DMA_BUS_ERROR;
}
if(REG(AES_CTRL_INT_STAT) & AES_CTRL_INT_STAT_KEY_ST_WR_ERR) {
REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_KEY_ST_WR_ERR;
return AES_KEYSTORE_WRITE_ERROR;
}
/* Acknowledge the interrupt */
REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_DMA_IN_DONE |
AES_CTRL_INT_CLR_RESULT_AV;
/* Disable master control / DMA clock */
REG(AES_CTRL_ALG_SEL) = 0x00000000;
/* Check status, if error return error code */
if(!(REG(AES_KEY_STORE_WRITTEN_AREA) & (0x00000001 << key_area))) {
return AES_KEYSTORE_WRITE_ERROR;
}
return CRYPTO_SUCCESS;
}
/** @} */