esp_ds: move timeout mechanism to driver layer

components/esp32c3/esp_ds.c

@@ -21,9 +21,10 @@
 #include "driver/periph_ctrl.h"
 #include "esp_crypto_lock.h"
 #include "hal/ds_hal.h"
+#include "hal/ds_ll.h"
 #include "hal/hmac_hal.h"
 #include "esp32c3/rom/digital_signature.h"
-
+#include "esp_timer.h"
 #include "esp_ds.h"
 
 struct esp_ds_context {
@@ -128,10 +129,12 @@ esp_err_t esp_ds_start_sign(const void *message,
     ds_hal_start();
 
     // check encryption key from HMAC
-    ds_key_check_t key_check_result = ds_hal_check_decryption_key();
-    if (key_check_result != DS_KEY_INPUT_OK) {
-        ds_disable_release();
-        return ESP32C3_ERR_HW_CRYPTO_DS_INVALID_KEY;
+    int64_t start_time = esp_timer_get_time();
+    while (ds_ll_busy() != 0) {
+        if ((esp_timer_get_time() - start_time) > DS_KEY_CHECK_MAX_WAIT_US) {
+            ds_disable_release();
+            return ESP32C3_ERR_HW_CRYPTO_DS_INVALID_KEY;
+        }
     }
 
     esp_ds_context_t *context = malloc(sizeof(esp_ds_context_t));

components/hal/ds_hal.c

@@ -26,18 +26,6 @@ void ds_hal_finish(void)
     ds_ll_finish();
 }
 
-ds_key_check_t ds_hal_check_decryption_key(void)
-{
-    uint64_t start_time = systimer_hal_get_time(SYSTIMER_COUNTER_0);
-    while (ds_ll_busy() != 0) {
-        if ((systimer_hal_get_time(SYSTIMER_COUNTER_0) - start_time) > DS_KEY_CHECK_MAX_WAIT_US) {
-            return ds_ll_key_error_source();
-        }
-    }
-
-    return DS_KEY_INPUT_OK;
-}
-
 void ds_hal_configure_iv(const uint32_t *iv)
 {
     ds_ll_configure_iv(iv);

components/hal/include/hal/ds_hal.h

@@ -60,11 +60,6 @@ void ds_hal_start(void);
  */
 void ds_hal_finish(void);
 
-/**
- * @brief Check whether the key input (HMAC on ESP32-C3) is correct.
- */
-ds_key_check_t ds_hal_check_decryption_key(void);
-
 /**
  * @brief Write the initialization vector.
  */