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/* nrf51.c
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL 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; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#ifdef WOLFSSL_NRF51
#include "bsp.h"
#include "nrf_delay.h"
#include "app_uart.h"
#include "app_error.h"
#include "nrf_drv_rng.h"
#include "nrf_drv_rtc.h"
#include "nrf_drv_clock.h"
#include "nrf_ecb.h"
#ifdef SOFTDEVICE_PRESENT
#include "softdevice_handler.h"
#include "nrf_soc.h"
#endif /* SOFTDEVICE_PRESENT */
/* RTC */
#ifndef NO_CRYPT_BENCHMARK
static byte mRtcInitDone = 0;
static int mRtcSec = 0;
const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(0); /**< Declaring an instance of nrf_drv_rtc for RTC0. */
#endif /* !NO_CRYPT_BENCHMARK */
/* AES */
#if !defined(NO_AES) && !defined(SOFTDEVICE_PRESENT)
static byte mAesInitDone = 0;
#endif
/** @brief Function for getting vector of random numbers.
*
* @param[out] p_buff Pointer to unit8_t buffer for storing the bytes.
* @param[in] length Number of bytes to take from pool and place in p_buff.
*
* @retval 0 = Success, else error
*/
int nrf51_random_generate(byte* output, word32 size)
{
int remaining = size, length, pos = 0;
uint8_t available;
uint32_t err_code;
/* Make sure RNG is running */
err_code = nrf_drv_rng_init(NULL);
if (err_code != NRF_SUCCESS && err_code != NRF_ERROR_INVALID_STATE) {
return -1;
}
while (remaining > 0) {
err_code = nrf_drv_rng_bytes_available(&available);
if (err_code == NRF_SUCCESS) {
length = (remaining < available) ? remaining : available;
if (length > 0) {
err_code = nrf_drv_rng_rand(&output[pos], length);
remaining -= length;
pos += length;
}
}
if (err_code != NRF_SUCCESS) {
break;
}
}
return (err_code == NRF_SUCCESS) ? 0 : -1;
}
#if !defined(NO_AES) && defined(WOLFSSL_NRF51_AES)
#ifdef SOFTDEVICE_PRESENT
static const byte* nRF51AesKey = NULL;
#endif
int nrf51_aes_set_key(const byte* key)
{
#ifdef SOFTDEVICE_PRESENT
nRF51AesKey = key;
#else
if (!mAesInitDone) {
nrf_ecb_init();
mAesInitDone = 1;
}
nrf_ecb_set_key(key);
#endif
return 0;
}
int nrf51_aes_encrypt(const byte* in, const byte* key, word32 rounds, byte* out)
{
int ret;
uint32_t err_code = 0;
#ifdef SOFTDEVICE_PRESENT
nrf_ecb_hal_data_t ecb_hal_data;
#endif
/* Set key */
ret = nrf51_aes_set_key(key);
if (ret != 0) {
return ret;
}
#ifdef SOFTDEVICE_PRESENT
/* Define ECB record */
XMEMCPY(ecb_hal_data.key, nRF51AesKey, SOC_ECB_KEY_LENGTH);
XMEMCPY(ecb_hal_data.cleartext, in, SOC_ECB_CLEARTEXT_LENGTH);
XMEMSET(ecb_hal_data.ciphertext, 0, SOC_ECB_CIPHERTEXT_LENGTH);
/* Perform block encrypt */
err_code = sd_ecb_block_encrypt(&ecb_hal_data);
if (err_code != NRF_SUCCESS) {
return -1;
}
/* Grab result */
XMEMCPY(out, ecb_hal_data.ciphertext, SOC_ECB_CIPHERTEXT_LENGTH);
#else
err_code = nrf_ecb_crypt(out, in);
err_code = err_code ? 0 : -1;
#endif
return err_code;
}
#endif /* !NO_AES && WOLFSSL_NRF51_AES */
#ifndef NO_CRYPT_BENCHMARK
static void rtc_handler(nrf_drv_rtc_int_type_t int_type)
{
if (int_type == NRF_DRV_RTC_INT_COMPARE0)
{
mRtcSec++;
nrf_drv_rtc_counter_clear(&rtc);
nrf_drv_rtc_int_enable(&rtc, RTC_CHANNEL_INT_MASK(0));
#ifdef BSP_LED_0
nrf_gpio_pin_toggle(BSP_LED_0);
#endif
}
}
static void rtc_config(void)
{
uint32_t err_code;
// Start the internal LFCLK XTAL oscillator
err_code = nrf_drv_clock_init(NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_clock_lfclk_request();
// Initialize RTC instance
err_code = nrf_drv_rtc_init(&rtc, NULL, rtc_handler);
APP_ERROR_CHECK(err_code);
// Enable tick event
nrf_drv_rtc_tick_enable(&rtc, false);
// Set compare channel to trigger interrupt after 1 seconds
err_code = nrf_drv_rtc_cc_set(&rtc, 0, RTC0_CONFIG_FREQUENCY, true);
APP_ERROR_CHECK(err_code);
// Power on RTC instance
nrf_drv_rtc_enable(&rtc);
}
static int rtc_get_ms(void)
{
/* Prescaler is 12-bit for COUNTER: frequency = (32768/(PRESCALER+1)) */
int frequency = (32768 / (rtc_prescaler_get(rtc.p_reg) + 1));
int counter = nrf_drv_rtc_counter_get(&rtc);
/* Convert with rounding frequency to milliseconds */
return ((counter * 1000) + (frequency / 2) ) / frequency;
}
double current_time(int reset)
{
double time;
if (!mRtcInitDone) {
rtc_config();
mRtcInitDone = 1;
}
time = mRtcSec;
time += (double)rtc_get_ms() / 1000;
return time;
}
#endif /* !NO_CRYPT_BENCHMARK */
#endif /* WOLFSSL_NRF51 */
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