add RNG using ChaCha20 as CSPRNG

1 files changed, 113 insertions, 0 deletions

diff --git a/src/cc20rng/stm32f4xx_hal_msp.c b/src/cc20rng/stm32f4xx_hal_msp.c
new file mode 100644
index 0000000..536a78c
--- /dev/null
+++ b/src/cc20rng/stm32f4xx_hal_msp.c
@@ -0,0 +1,113 @@
+#include "stm_init.h"
+#include "stm32f4xx_hal.h"
+
+static void Error_Handler(void);
+extern void HAL_DMA_XferCpltCallback(DMA_HandleTypeDef *hdma);
+
+void HAL_TIM_IC_MspInit(TIM_HandleTypeDef* htim)
+{
+  if (htim->Instance == TIM2) {
+    /* Configure DMA input capturing.
+     *
+     * Amplified avalanche noise is present at pin PA1,
+     * which has Alternate Function TIM2_CH2.
+     *
+     * TIM2_CH2 is DMA1 stream 6, channel 3 according to Table 28
+     * (DMA1 request mapping) in the reference manual (RM0368).
+     */
+    __DMA1_CLK_ENABLE();
+    __TIM2_CLK_ENABLE();
+    __GPIOA_CLK_ENABLE();
+
+    hdma_tim.Instance = DMA1_Stream6;
+
+    hdma_tim.Init.Channel             = DMA_CHANNEL_3;
+    hdma_tim.Init.Direction           = DMA_PERIPH_TO_MEMORY;
+    hdma_tim.Init.PeriphInc           = DMA_PINC_DISABLE;
+    hdma_tim.Init.MemInc              = DMA_MINC_ENABLE;
+    hdma_tim.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
+    hdma_tim.Init.MemDataAlignment    = DMA_MDATAALIGN_WORD;
+    hdma_tim.Init.Mode                = DMA_NORMAL;
+    hdma_tim.Init.Priority            = DMA_PRIORITY_HIGH;
+    hdma_tim.Init.FIFOMode            = DMA_FIFOMODE_DISABLE;
+    hdma_tim.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;
+    hdma_tim.Init.MemBurst            = DMA_MBURST_SINGLE;
+    hdma_tim.Init.PeriphBurst         = DMA_PBURST_SINGLE;
+
+    /* Link hdma_tim to hdma[2] (channel3) */
+    __HAL_LINKDMA(htim, hdma[TIM_DMA_ID_CC2], hdma_tim);
+
+    /* Initialize TIMx DMA handle */
+    if (HAL_DMA_Init(&hdma_tim) != HAL_OK) {
+      Error_Handler();
+    }
+  }
+}
+
+void HAL_UART_MspInit(UART_HandleTypeDef* huart)
+{
+  GPIO_InitTypeDef GPIO_InitStruct;
+
+  if (huart->Instance == USART1) {
+    /* Peripheral clock enable */
+    __USART1_CLK_ENABLE();
+
+    /**USART1 GPIO Configuration
+    PA9     ------> USART1_TX
+    PA10    ------> USART1_RX
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_9 | GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+    /* NVIC for interrupt mode */
+    HAL_NVIC_SetPriority(USART1_IRQn, 0, 1);
+    HAL_NVIC_EnableIRQ(USART1_IRQn);
+  } else if (huart->Instance == USART2) {
+    /* Peripheral clock enable */
+    __USART2_CLK_ENABLE();
+    GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+    /* NVIC for interrupt mode */
+    HAL_NVIC_SetPriority(USART2_IRQn, 0, 1);
+    HAL_NVIC_EnableIRQ(USART2_IRQn);
+  }
+}
+
+void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
+{
+  if (huart->Instance == USART1) {
+    /* Peripheral clock disable */
+    __USART1_CLK_DISABLE();
+
+    /**USART1 GPIO Configuration
+    PA9     ------> USART1_TX
+    PA10    ------> USART1_RX
+    */
+    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9 | GPIO_PIN_10);
+  } else if (huart->Instance == USART2) {
+    __USART2_CLK_DISABLE();
+    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2 | GPIO_PIN_3);
+  }
+}
+
+/**
+  * @brief  This function is executed in case of error occurrence.
+  * @param  None
+  * @retval None
+  */
+static void Error_Handler(void)
+{
+  /* Turn on RED LED and then loop indefinitely */
+  HAL_GPIO_WritePin(LED_PORT, LED_RED, GPIO_PIN_SET);
+
+  while (1) { ; }
+}