esp_hw_support: add crypto lock layer for esp32

components/esp_hw_support/include/soc/esp32/esp_crypto_lock.h

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Acquire lock for the mpi cryptography peripheral.
+ *
+ */
+void esp_crypto_mpi_lock_acquire(void);
+
+/**
+ * @brief Release lock for the mpi cryptography peripheral.
+ *
+ */
+void esp_crypto_mpi_lock_release(void);
+
+#ifdef __cplusplus
+}
+#endif

components/esp_hw_support/port/esp32/CMakeLists.txt

@@ -11,6 +11,7 @@ set(srcs
 
 if(NOT BOOTLOADER_BUILD)
     list(APPEND srcs "cache_sram_mmu.c"
+                     "esp_crypto_lock.c"
                      "sar_periph_ctrl.c")
 endif()
 

components/esp_hw_support/port/esp32/esp_crypto_lock.c

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <sys/lock.h>
+
+#include "esp_crypto_lock.h"
+
+/* Lock overview:
+MPI/RSA: independent
+*/
+
+/* Lock for the MPI/RSA peripheral */
+
+static _lock_t s_crypto_mpi_lock;
+
+void esp_crypto_mpi_lock_acquire(void)
+{
+    _lock_acquire(&s_crypto_mpi_lock);
+}
+
+void esp_crypto_mpi_lock_release(void)
+{
+    _lock_release(&s_crypto_mpi_lock);
+}

components/mbedtls/port/bignum/bignum_alt.c

@@ -3,28 +3,17 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#include "esp_crypto_lock.h"
 #include "esp_private/periph_ctrl.h"
 #include "bignum_impl.h"
 #include "mbedtls/bignum.h"
 
-#if CONFIG_IDF_TARGET_ESP32
-#include <sys/lock.h>
-static _lock_t mpi_lock;
-#else
-#include "esp_crypto_lock.h"
-#endif
-
 #include "hal/mpi_hal.h"
 
 
 void esp_mpi_enable_hardware_hw_op( void )
 {
-#if CONFIG_IDF_TARGET_ESP32
-    /* newlib locks lazy initialize on ESP-IDF */
-    _lock_acquire(&mpi_lock);
-#else
     esp_crypto_mpi_lock_acquire();
-#endif
 
     /* Enable RSA hardware */
     periph_module_enable(PERIPH_RSA_MODULE);
@@ -40,11 +29,7 @@ void esp_mpi_disable_hardware_hw_op( void )
     /* Disable RSA hardware */
     periph_module_disable(PERIPH_RSA_MODULE);
 
-#if CONFIG_IDF_TARGET_ESP32
-    _lock_release(&mpi_lock);
-#else
     esp_crypto_mpi_lock_release();
-#endif
 }
 
 size_t esp_mpi_hardware_words(size_t words)