From f7ade96f03f0256f54d233a0f5cac3377a1f1dfb Mon Sep 17 00:00:00 2001
From: "harshal.patil" <harshal.patil@espressif.com>
Date: Tue, 11 Jul 2023 15:43:11 +0530
Subject: [PATCH] hw/misc: implement ESP32-C3 HMAC

Added an internal HMAC implementation using the existing internal SHA APIs
---
 hw/misc/esp32c3_hmac.c         | 33 +++++++++++++++++++++++++++++++++
 hw/misc/meson.build            |  2 ++
 include/hw/misc/esp32c3_hmac.h | 26 ++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 hw/misc/esp32c3_hmac.c
 create mode 100644 include/hw/misc/esp32c3_hmac.h

diff --git a/hw/misc/esp32c3_hmac.c b/hw/misc/esp32c3_hmac.c
new file mode 100644
index 0000000000..d3b37ce470
--- /dev/null
+++ b/hw/misc/esp32c3_hmac.c
@@ -0,0 +1,33 @@
+/*
+ * ESP32-C3 HMAC emulation
+ *
+ * Copyright (c) 2023 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/misc/esp32c3_hmac.h"
+
+static void esp32c3_hmac_class_init(ObjectClass *klass, void *data)
+{
+    ESPHmacClass *class = ESP_HMAC_CLASS(klass);
+    class->date = ESP32C3_HMAC_DATE_REG_VALUE;
+}
+
+static const TypeInfo esp32c3_hmac_info = {
+    .name = TYPE_ESP32C3_HMAC,
+    .parent = TYPE_ESP_HMAC,
+    .instance_size = sizeof(ESP32C3HmacState),
+    .class_init = esp32c3_hmac_class_init,
+    .class_size = sizeof(ESP32C3HmacClass)
+};
+
+static void esp32c3_hmac_register_types(void)
+{
+    type_register_static(&esp32c3_hmac_info);
+}
+
+type_init(esp32c3_hmac_register_types)
diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index b441d36497..522639a50a 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -154,6 +154,8 @@ system_ss.add(when: 'CONFIG_RISCV_ESP32C3', if_true: files(
   'esp32c3_sha.c',
   'esp32c3_jtag.c',
   'esp32c3_rtc_cntl.c',
+  'esp_hmac.c',
+  'esp32c3_hmac.c'
 ))
 if gcrypt.found()
   system_ss.add(when: [gcrypt, 'CONFIG_XTENSA_ESP32'], if_true: files(
diff --git a/include/hw/misc/esp32c3_hmac.h b/include/hw/misc/esp32c3_hmac.h
new file mode 100644
index 0000000000..b034b68333
--- /dev/null
+++ b/include/hw/misc/esp32c3_hmac.h
@@ -0,0 +1,26 @@
+/*
+ * ESP32-C3 HMAC emulation
+ *
+ * Copyright (c) 2023 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+
+#pragma once
+
+#include "hw/misc/esp_hmac.h"
+
+#define TYPE_ESP32C3_HMAC "misc.esp32c3.hmac"
+#define ESP32C3_HMAC(obj) OBJECT_CHECK(ESP32C3HmacState, (obj), TYPE_ESP32C3_HMAC)
+
+#define ESP32C3_HMAC_DATE_REG_VALUE 0x20200618
+
+typedef struct ESP32C3HmacState {
+    ESPHmacState parent;
+} ESP32C3HmacState;
+
+typedef struct ESP32C3HmacClass {
+    ESPHmacClass parent_class;
+} ESP32C3HmacClass;