rsa: add generate RSA keys test case

components/mbedtls/Kconfig

@@ -285,7 +285,7 @@ menu "mbedTLS"
     config MBEDTLS_MPI_USE_INTERRUPT
         bool "Use interrupt for MPI exp-mod operations"
         depends on !IDF_TARGET_ESP32 && MBEDTLS_HARDWARE_MPI
-        default n
+        default y
         help
             Use an interrupt to coordinate long MPI operations.
 

components/mbedtls/test/test_rsa.c

@@ -6,11 +6,14 @@
 */
 #include <string.h>
 #include <stdbool.h>
-#include <esp_system.h>
+#include "esp_system.h"
+#include "esp_task_wdt.h"
 #include "mbedtls/rsa.h"
 #include "mbedtls/pk.h"
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/entropy_poll.h"
+#include <mbedtls/entropy.h>
+#include <mbedtls/ctr_drbg.h>
 #include "freertos/FreeRTOS.h"
 #include "unity.h"
 #include "test_utils.h"
@@ -518,3 +521,39 @@ static void rsa_key_operations(int keysize, bool check_performance, bool use_bli
 }
 
 #endif // CONFIG_MBEDTLS_HARDWARE_MPI
+
+TEST_CASE("mbedtls RSA Generate Key", "[mbedtls][timeout=60]")
+{
+
+    mbedtls_rsa_context ctx;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+
+    const unsigned int key_size = 3072;
+    const int exponent = 65537;
+
+#if CONFIG_MBEDTLS_MPI_USE_INTERRUPT
+    /* Check that generating keys doesnt starve the watchdog if interrupt-based driver is used */
+    const int timeout_s = 1;
+    esp_task_wdt_init(timeout_s, true);
+    esp_task_wdt_add(xTaskGetIdleTaskHandleForCPU(0));
+#endif //CONFIG_MBEDTLS_MPI_USE_INTERRUPT
+
+    mbedtls_rsa_init(&ctx, MBEDTLS_RSA_PKCS_V15, 0);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+
+    mbedtls_entropy_init(&entropy);
+    TEST_ASSERT_FALSE( mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0) );
+
+    TEST_ASSERT_FALSE( mbedtls_rsa_gen_key(&ctx, mbedtls_ctr_drbg_random, &ctr_drbg, key_size, exponent) );
+
+    mbedtls_rsa_free(&ctx);
+    mbedtls_ctr_drbg_free(&ctr_drbg);
+    mbedtls_entropy_free(&entropy);
+
+#if CONFIG_MBEDTLS_MPI_USE_INTERRUPT
+    esp_task_wdt_delete(xTaskGetIdleTaskHandleForCPU(0));
+    esp_task_wdt_deinit();
+#endif //CONFIG_MBEDTLS_MPI_USE_INTERRUPT
+
+}

tools/unit-test-app/configs/aes_no_hw

@@ -2,4 +2,4 @@
 TEST_EXCLUDE_COMPONENTS=bt app_update test_utils
 TEST_COMPONENTS=mbedtls
 CONFIG_MBEDTLS_HARDWARE_AES=n
-CONFIG_MBEDTLS_MPI_USE_INTERRUPT=y
+CONFIG_MBEDTLS_MPI_USE_INTERRUPT=n