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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#define AO_CMAC_KEY_LEN 16
#define AO_CMAC_MAX_LEN (128 - AO_CMAC_KEY_LEN)
static __xdata uint8_t cmac_key[AO_CMAC_KEY_LEN];
static __xdata uint8_t cmac_data[AO_CMAC_MAX_LEN + AO_CMAC_KEY_LEN + 2 + AO_CMAC_KEY_LEN];
static __pdata uint8_t ao_radio_cmac_len;
static uint8_t
getnibble(void)
{
__pdata char c;
c = getchar();
if ('0' <= c && c <= '9')
return c - '0';
if ('a' <= c && c <= 'f')
return c - ('a' - 10);
if ('A' <= c && c <= 'F')
return c - ('A' - 10);
ao_cmd_status = ao_cmd_lex_error;
return 0;
}
static uint8_t
getbyte(void)
{
uint8_t b;
b = getnibble() << 4;
b |= getnibble();
return b;
}
static void
ao_radio_cmac_key(void) __reentrant
{
uint8_t i;
for (i = 0; i < AO_CMAC_KEY_LEN; i++) {
cmac_key[i] = getbyte();
if (ao_cmd_status != ao_cmd_success)
return;
}
}
static void
ao_radio_cmac_send(void) __reentrant
{
uint8_t i;
uint8_t len;
ao_cmd_decimal();
if (ao_cmd_status != ao_cmd_success)
return;
if (ao_cmd_lex_i < AO_CMAC_KEY_LEN ||
ao_cmd_lex_i > AO_CMAC_MAX_LEN ||
ao_cmd_lex_i % AO_CMAC_KEY_LEN != 0)
{
ao_cmd_status = ao_cmd_syntax_error;
return;
}
flush();
len = ao_cmd_lex_i;
for (i = 0; i < len; i++) {
cmac_data[i] = getbyte();
if (ao_cmd_status != ao_cmd_success)
return;
}
ao_mutex_get(&ao_aes_mutex);
ao_aes_set_mode(ao_aes_mode_cbc_mac);
ao_aes_set_key(cmac_key);
ao_aes_zero_iv();
for (i = 0; i < len; i += AO_CMAC_KEY_LEN) {
if (i + AO_CMAC_KEY_LEN < len)
ao_aes_run(&cmac_data[i], NULL);
else
ao_aes_run(&cmac_data[i], &cmac_data[len]);
}
ao_mutex_put(&ao_aes_mutex);
#if HAS_MONITOR
ao_set_monitor(0);
#endif
printf("send:");
for (i = 0; i < len + AO_CMAC_KEY_LEN; i++)
printf(" %02x", cmac_data[i]);
printf("\n"); flush();
ao_radio_send(cmac_data, len + AO_CMAC_KEY_LEN);
}
static void
ao_radio_cmac_recv(void) __reentrant
{
uint8_t len, i;
uint16_t timeout;
ao_cmd_decimal();
if (ao_cmd_status != ao_cmd_success)
return;
if (ao_cmd_lex_i < AO_CMAC_KEY_LEN ||
ao_cmd_lex_i > AO_CMAC_MAX_LEN ||
ao_cmd_lex_i % AO_CMAC_KEY_LEN != 0)
{
ao_cmd_status = ao_cmd_syntax_error;
return;
}
len = ao_cmd_lex_i;
ao_cmd_decimal();
if (ao_cmd_status != ao_cmd_success)
return;
timeout = ao_cmd_lex_i;
#if HAS_MONITOR
ao_set_monitor(0);
#endif
if (timeout)
ao_alarm(timeout);
if (!ao_radio_recv(cmac_data, len + AO_CMAC_KEY_LEN + 2)) {
printf("timeout\n");
return;
}
ao_mutex_get(&ao_aes_mutex);
ao_aes_set_mode(ao_aes_mode_cbc_mac);
ao_aes_set_key(cmac_key);
ao_aes_zero_iv();
for (i = 0; i < len; i += AO_CMAC_KEY_LEN) {
if (i + AO_CMAC_KEY_LEN < len)
ao_aes_run(&cmac_data[i], NULL);
else
ao_aes_run(&cmac_data[i], &cmac_data[len + AO_CMAC_KEY_LEN + 2]);
}
printf ("PACKET ");
for (i = 0; i < len + AO_CMAC_KEY_LEN + 2 + AO_CMAC_KEY_LEN; i++)
printf("%02x", cmac_data[i]);
printf ("\n");
}
static __code struct ao_cmds ao_radio_cmac_cmds[] = {
{ ao_radio_cmac_key, "k\0Set AES-CMAC key. 16 key bytes follow on next line" },
{ ao_radio_cmac_send, "s <length>\0Send AES-CMAC packet. Bytes to send follow on next line" },
{ ao_radio_cmac_recv, "S <length> <timeout>\0Receive AES-CMAC packet. Timeout in ms" },
{ 0, NULL },
};
void
ao_radio_cmac_init(void)
{
ao_cmd_register(&ao_radio_cmac_cmds[0]);
}
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