esp32c6: add bootloader support

components/bootloader_support/src/esp32c6/bootloader_sha.c

@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "bootloader_sha.h"
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+#include <sys/param.h>
+
+#include "esp32c6/rom/sha.h"
+
+static SHA_CTX ctx;
+
+bootloader_sha256_handle_t bootloader_sha256_start()
+{
+    // Enable SHA hardware
+    ets_sha_enable();
+    ets_sha_init(&ctx, SHA2_256);
+    return &ctx; // Meaningless non-NULL value
+}
+
+void bootloader_sha256_data(bootloader_sha256_handle_t handle, const void *data, size_t data_len)
+{
+    assert(handle != NULL);
+    assert(data_len % 4 == 0);
+    ets_sha_update(&ctx, data, data_len, false);
+}
+
+void bootloader_sha256_finish(bootloader_sha256_handle_t handle, uint8_t *digest)
+{
+    assert(handle != NULL);
+
+    if (digest == NULL) {
+        bzero(&ctx, sizeof(ctx));
+        return;
+    }
+    ets_sha_finish(&ctx, digest);
+}