diff options
Diffstat (limited to 'src/demo.c')
| -rw-r--r-- | src/demo.c | 23 |
1 files changed, 18 insertions, 5 deletions
@@ -38,6 +38,7 @@ #include <libopencm3/stm32/timer.h>
#include <libopencm3/stm32/otg_hs.h>
#include <libopencm3/stm32/otg_fs.h>
+#include <libopencm3/stm32/pwr.h>
#include <libopencm3/stm32/dma.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencmsis/core_cm3.h>
@@ -56,7 +57,9 @@ static struct NoiseState noise_state;
-static uint8_t remote_key_reference[CURVE25519_KEY_LEN];
+static uint8_t remote_key_reference[BLAKE2S_HASH_SIZE] __attribute__((section(".backup_sram")));
+static uint8_t local_key[CURVE25519_KEY_LEN] __attribute__((section(".backup_sram")));
+static uint8_t identity_key_valid __attribute__((section(".backup_sram"))) = 0;
void _fini(void);
@@ -81,6 +84,9 @@ static void clock_setup(void) { rcc_periph_clock_enable(RCC_DMA2);
rcc_periph_clock_enable(RCC_DMA1);
+ rcc_periph_clock_enable(RCC_PWR);
+ rcc_periph_clock_enable(RCC_BKPSRAM);
+
rcc_periph_clock_enable(RCC_RNG);
}
@@ -413,6 +419,8 @@ int main(void) {
clock_setup();
gpio_setup();
+ pwr_disable_backup_domain_write_protect();
+ PWR_CSR |= PWR_CSR_BRE; /* Enable backup SRAM battery power regulator */
/* provides time_curr_us to usbh_poll function */
tim6_setup();
@@ -447,12 +455,17 @@ int main(void) LOG_PRINTF("Initializing RNG...\n");
rand_init();
- noise_state_init(&noise_state, remote_key_reference);
+ noise_state_init(&noise_state, remote_key_reference, local_key);
/* FIXME load remote key from backup memory */
/* FIXME only run this on first boot and persist key in backup sram. Allow reset via jumper-triggered factory reset function. */
- LOG_PRINTF("Generating identity key...\n");
- if (generate_identity_key(&noise_state))
- LOG_PRINTF("Error generating identiy key\n");
+ if (!identity_key_valid) {
+ LOG_PRINTF("Generating identity key...\n");
+ if (generate_identity_key(&noise_state)) {
+ LOG_PRINTF("Error generating identiy key\n");
+ } else {
+ identity_key_valid = 1;
+ }
+ }
int poll_ctr = 0;
while (23) {
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