main.c

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 ** This notice applies to any and all portions of this file
 * that are not between comment pairs USER CODE BEGIN and
 * USER CODE END. Other portions of this file, whether 
 * inserted by the user or by software development tools
 * are owned by their respective copyright owners.
 *
 * COPYRIGHT(c) 2019 STMicroelectronics
 *
 * 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 STMicroelectronics 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.
 *
 ******************************************************************************
 */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stdint.h>
#include "crypto_aead.h"
#include "api.h"

#ifndef KEY_LENGTH
#define KEY_LENGTH 16
#endif

#ifndef NSEC_LENGTH
#define NSEC_LENGTH 0
#endif

#ifndef NPUB_LENGTH
#define NPUB_LENGTH 0
#endif

unsigned char c[1400];
unsigned long long clen = 0;
unsigned char m[1400];
unsigned long long mlen = 0;
unsigned char ad[1400];
unsigned long long adlen = 0;
unsigned char nsec[512];

unsigned long long nslen = NSEC_LENGTH;
unsigned char npub[512];
unsigned long long nplen = NPUB_LENGTH;
unsigned char k[512];
unsigned long long klen = KEY_LENGTH;
unsigned char rcv;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
static void read_variable_serial(unsigned char action);
static void write_variable_serial(unsigned char target[], unsigned long long len);

static void read_variable_serial(unsigned char action){

  uint32_t len; 
  for (int i = 3; i >= 0; i--) {
    while (LL_USART_IsActiveFlag_RXNE(USART1));
    rcv = LL_USART_ReceiveData8(USART1);
    len |= (uint32_t) rcv << i*8;
  }

  for (int i = 0; i < len; i++) {
    while (LL_USART_IsActiveFlag_RXNE(USART1));
    rcv = LL_USART_ReceiveData8(USART1);
    // Implement all cases or use another concept at all
    switch(action) {
      case 'k':
        k[i] = rcv;
        break;
      default: 
        return -1:
    }

  }

  static void write_variable_serial(unsigned char target[], unsigned long long len) {

    unsigned char trm;
    for (int i = 3; i >= 0; i--) {
      trm = (uint8_t) len >> i*8;
      while (!LL_USART_IsActiveFlag_TXE(USART1));
      LL_USART_TransmitData8(USART1, trm);
    }

    for (int i = 0; i < len; i++) {
      while (!LL_USART_IsActiveFlag_TXE(USART1));
      LL_USART_TransmitData8(USART1, target[i]);
    }

  }


  int main(void)
  {
    /* USER CODE BEGIN 1 */

    /* USER CODE END 1 */

    /* MCU Configuration--------------------------------------------------------*/

    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */


    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);

    NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

    /* System interrupt init*/

    /**NOJTAG: JTAG-DP Disabled and SW-DP Enabled 
    */
    LL_GPIO_AF_Remap_SWJ_NOJTAG();

    /* USER CODE BEGIN Init */

    /* USER CODE END Init */

    /* Configure the system clock */
    SystemClock_Config();

    /* USER CODE BEGIN SysInit */

    /* USER CODE END SysInit */

    /* Initialize all configured peripherals */
    MX_GPIO_Init();
    MX_USART1_UART_Init();
    /* USER CODE BEGIN 2 */

    /* USER CODE END 2 */

    /* Infinite loop */
    /* USER CODE BEGIN WHILE */

    while (1) {
      /* USER CODE END WHILE */
      while (LL_USART_IsActiveFlag_RXNE(USART1));
      rcv = LL_USART_ReceiveData8(USART1);
      switch (rcv) {
        case 'c': 
        case 'm': 
        case 'a': 
        case 'k': 
        case 's': 
        case 'p': read_variable(rcv); break;
        case 'C': write_variable(c, clen); break;
        case 'M': write_variable(m, mlen); break;
        case 'A': write_variable(ad, adlen); break;
        case 'K': write_variable(k, klen); break;
        case 'S': write_variable(nsec, nslen); break;
        case 'P': write_variable(npub, nplen); break;


        case 'e':
                  res = crypto_aead_encrypt(c, &clen, m, mlen, ad, adlen, nsec, npub, k);
                  break;
        default:
                  return 2;
      }

      /**
       * @brief System Clock Configuration
       * @retval None
       */
      void SystemClock_Config(void)
      {
        LL_FLASH_SetLatency(LL_FLASH_LATENCY_1);

        if(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_1)
        {
          Error_Handler();  
        }
        LL_RCC_HSI_SetCalibTrimming(16);
        LL_RCC_HSI_Enable();

        /* Wait till HSI is ready */
        while(LL_RCC_HSI_IsReady() != 1)
        {

        }
        LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, LL_RCC_PLL_MUL_12);
        LL_RCC_PLL_Enable();

        /* Wait till PLL is ready */
        while(LL_RCC_PLL_IsReady() != 1)
        {

        }
        LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
        LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
        LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
        LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);

        /* Wait till System clock is ready */
        while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
        {

        }
        LL_Init1msTick(48000000);
        LL_SYSTICK_SetClkSource(LL_SYSTICK_CLKSOURCE_HCLK);
        LL_SetSystemCoreClock(48000000);
      }

      /**
       * @brief USART1 Initialization Function
       * @param None
       * @retval None
       */
      static void MX_USART1_UART_Init(void)
      {

        /* USER CODE BEGIN USART1_Init 0 */

        /* USER CODE END USART1_Init 0 */

        LL_USART_InitTypeDef USART_InitStruct = {0};

        LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

        /* Peripheral clock enable */
        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);

        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
        /**USART1 GPIO Configuration  
          PA9   ------> USART1_TX
          PA10   ------> USART1_RX 
          */
        GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
        GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
        GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
        LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        GPIO_InitStruct.Pin = LL_GPIO_PIN_10;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_FLOATING;
        LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        /* USER CODE BEGIN USART1_Init 1 */

        /* USER CODE END USART1_Init 1 */
        USART_InitStruct.BaudRate = 115200;
        USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
        USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
        USART_InitStruct.Parity = LL_USART_PARITY_NONE;
        USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
        USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
        LL_USART_Init(USART1, &USART_InitStruct);
        LL_USART_ConfigAsyncMode(USART1);
        LL_USART_Enable(USART1);
        /* USER CODE BEGIN USART1_Init 2 */

        /* USER CODE END USART1_Init 2 */

      }

      /**
       * @brief GPIO Initialization Function
       * @param None
       * @retval None
       */
      static void MX_GPIO_Init(void)
      {
        LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

        /* GPIO Ports Clock Enable */
        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOC);
        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOD);
        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);

        /**/
        LL_GPIO_ResetOutputPin(GPIOB, LL_GPIO_PIN_12);

        /**/
        GPIO_InitStruct.Pin = LL_GPIO_PIN_13|LL_GPIO_PIN_14|LL_GPIO_PIN_15;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
        LL_GPIO_Init(GPIOC, &GPIO_InitStruct);

        /**/
        GPIO_InitStruct.Pin = LL_GPIO_PIN_0|LL_GPIO_PIN_1;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
        LL_GPIO_Init(GPIOD, &GPIO_InitStruct);

        /**/
        GPIO_InitStruct.Pin = LL_GPIO_PIN_0|LL_GPIO_PIN_1|LL_GPIO_PIN_2|LL_GPIO_PIN_3 
          |LL_GPIO_PIN_4|LL_GPIO_PIN_5|LL_GPIO_PIN_6|LL_GPIO_PIN_7 
          |LL_GPIO_PIN_8|LL_GPIO_PIN_11|LL_GPIO_PIN_12|LL_GPIO_PIN_15;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
        LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        /**/
        GPIO_InitStruct.Pin = LL_GPIO_PIN_0|LL_GPIO_PIN_1|LL_GPIO_PIN_2|LL_GPIO_PIN_10 
          |LL_GPIO_PIN_11|LL_GPIO_PIN_13|LL_GPIO_PIN_14|LL_GPIO_PIN_15 
          |LL_GPIO_PIN_3|LL_GPIO_PIN_4|LL_GPIO_PIN_5|LL_GPIO_PIN_6 
          |LL_GPIO_PIN_7|LL_GPIO_PIN_8|LL_GPIO_PIN_9;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
        LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

        /**/
        GPIO_InitStruct.Pin = LL_GPIO_PIN_12;
        GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
        GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
        GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
        LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

        /**/
        LL_GPIO_AF_EnableRemap_PD01();

      }

      /* USER CODE BEGIN 4 */

      /* USER CODE END 4 */

      /**
       * @brief  This function is executed in case of error occurrence.
       * @retval None
       */
      void Error_Handler(void)
      {
        /* USER CODE BEGIN Error_Handler_Debug */
        /* User can add his own implementation to report the HAL error return state */

        /* USER CODE END Error_Handler_Debug */
      }

#ifdef  USE_FULL_ASSERT
      /**
       * @brief  Reports the name of the source file and the source line number
       *         where the assert_param error has occurred.
       * @param  file: pointer to the source file name
       * @param  line: assert_param error line source number
       * @retval None
       */
      void assert_failed(uint8_t *file, uint32_t line)
      { 
        /* USER CODE BEGIN 6 */
        /* User can add his own implementation to report the file name and line number,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
        /* USER CODE END 6 */
      }
#endif /* USE_FULL_ASSERT */

      /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/