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CC2420: Hardware-accelerated aes_128_driver

This commit is contained in:
kkrentz 2013-05-24 05:24:14 -07:00
parent 2bac58f7b6
commit 6486c51692
2 changed files with 39 additions and 5 deletions
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40
dev/cc2420/cc2420.c
View File

@ -352,6 +352,39 @@ wait_for_transmission(void)
&& RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (RTIMER_SECOND / 10)));
}
/*---------------------------------------------------------------------------*/
static void
init_security(void)
{
/* only use key 0 */
setreg(CC2420_SECCTRL0, 0);
setreg(CC2420_SECCTRL1, 0);
}
/*---------------------------------------------------------------------------*/
static void
set_key(uint8_t *key)
{
write_ram(key, CC2420RAM_KEY0, 16, CC2420_WRITE_RAM_REVERSE);
}
/*---------------------------------------------------------------------------*/
static void
encrypt(uint8_t *plaintext_and_result)
{
write_ram(plaintext_and_result,
CC2420RAM_SABUF,
16,
CC2420_WRITE_RAM_IN_ORDER);
strobe(CC2420_SAES);
while(get_status() & BV(CC2420_ENC_BUSY));
read_ram(plaintext_and_result, CC2420RAM_SABUF, 16);
}
/*---------------------------------------------------------------------------*/
const struct aes_128_driver cc2420_aes_128_driver = {
set_key,
encrypt
};
/*---------------------------------------------------------------------------*/
static uint8_t locked, lock_on, lock_off;
static void
@ -473,10 +506,7 @@ cc2420_init(void)
/* Set the FIFOP threshold to maximum. */
setreg(CC2420_IOCFG0, FIFOP_THR(127));
/* Turn off "Security enable" (page 32). */
reg = getreg(CC2420_SECCTRL0);
reg &= ~RXFIFO_PROTECTION;
setreg(CC2420_SECCTRL0, reg);
init_security();
cc2420_set_pan_addr(0xffff, 0x0000, NULL);
cc2420_set_channel(CC2420_CONF_CHANNEL);
@ -590,7 +620,7 @@ static int
cc2420_prepare(const void *payload, unsigned short payload_len)
{
uint8_t total_len;
GET_LOCK();
PRINTF("cc2420: sending %d bytes\n", payload_len);

4
dev/cc2420/cc2420.h
View File

@ -36,6 +36,7 @@
* \author
* Adam Dunkels <adam@sics.se>
* Joakim Eriksson <joakime@sics.se>
* Konrad Krentz <konrad.krentz@gmail.com>
*/
#ifndef CC2420_H_
@ -45,6 +46,7 @@
#include "dev/spi.h"
#include "dev/radio.h"
#include "cc2420_const.h"
#include "lib/aes-128.h"
int cc2420_init(void);
@ -88,6 +90,8 @@ int cc2420_off(void);
void cc2420_set_cca_threshold(int value);
extern const struct aes_128_driver cc2420_aes_128_driver;
/************************************************************************/
/* Additional SPI Macros for the CC2420 */
/************************************************************************/