HMAC: adding upstream message support

components/esp32s2/esp_hmac.c

@@ -0,0 +1,47 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32s2/rom/hmac.h"
+#include "esp32s2/rom/ets_sys.h"
+#include "esp_hmac.h"
+#include "esp_crypto_lock.h"
+
+static ets_efuse_block_t convert_key_type(hmac_key_id_t key_id) {
+    return ETS_EFUSE_BLOCK_KEY0 + (ets_efuse_block_t) key_id;
+}
+
+esp_err_t esp_hmac_calculate(hmac_key_id_t key_id,
+        const void *message,
+        size_t message_len,
+        uint8_t *hmac)
+{
+    int hmac_ret;
+    if (!message || !hmac) return ESP_ERR_INVALID_ARG;
+    if (key_id >= HMAC_KEY_MAX) return ESP_ERR_INVALID_ARG;
+
+    esp_crypto_lock_acquire();
+
+    ets_hmac_enable();
+    hmac_ret = ets_hmac_calculate_message(convert_key_type(key_id), message, message_len, hmac);
+    ets_hmac_disable();
+
+    esp_crypto_lock_release();
+
+    if (hmac_ret != ETS_OK) {
+        return ESP_FAIL;
+    } else {
+        return ESP_OK;
+    }
+
+}