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https://github.com/espressif/esp-idf.git
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108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include "esp32s2/rom/hmac.h"
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#include "esp_hmac.h"
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#include "esp_crypto_lock.h"
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#include "esp_efuse.h"
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#include "esp_efuse_table.h"
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#include "soc/hwcrypto_reg.h"
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#include "soc/system_reg.h"
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#include "esp_log.h"
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static const char *TAG = "esp_hmac";
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static ets_efuse_block_t convert_key_type(hmac_key_id_t key_id) {
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return ETS_EFUSE_BLOCK_KEY0 + (ets_efuse_block_t) key_id;
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}
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esp_err_t esp_hmac_calculate(hmac_key_id_t key_id,
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const void *message,
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size_t message_len,
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uint8_t *hmac)
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{
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int hmac_ret;
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if (!message || !hmac) return ESP_ERR_INVALID_ARG;
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if (key_id >= HMAC_KEY_MAX) return ESP_ERR_INVALID_ARG;
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esp_crypto_dma_lock_acquire();
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ets_hmac_enable();
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hmac_ret = ets_hmac_calculate_message(convert_key_type(key_id), message, message_len, hmac);
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ets_hmac_disable();
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esp_crypto_dma_lock_release();
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if (hmac_ret != 0) {
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return ESP_FAIL;
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} else {
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return ESP_OK;
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}
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}
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esp_err_t esp_hmac_jtag_enable(hmac_key_id_t key_id, const uint8_t *token)
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{
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int ets_status;
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esp_err_t err = ESP_OK;
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if ((!token) || (key_id >= HMAC_KEY_MAX))
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return ESP_ERR_INVALID_ARG;
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/* Check if JTAG is permanently disabled by HW Disable eFuse */
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if (esp_efuse_read_field_bit(ESP_EFUSE_HARD_DIS_JTAG)) {
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ESP_LOGE(TAG, "JTAG disabled permanently.");
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return ESP_FAIL;
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}
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esp_crypto_dma_lock_acquire();
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ets_hmac_enable();
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/* Token updating into HMAC module. */
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for (int i = 0; i < 32; i += 4) {
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uint32_t key_word;
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memcpy(&key_word, &token[i], 4);
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REG_WRITE(DPORT_JTAG_CTRL_0_REG + i, __builtin_bswap32(key_word));
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}
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ets_status = ets_hmac_calculate_downstream(convert_key_type(key_id), ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_JTAG);
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if (ets_status != ETS_OK) {
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err = ESP_FAIL;
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ESP_LOGE(TAG, "HMAC downstream JTAG enable mode setting failed. (%d)", err);
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}
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ESP_LOGD(TAG, "HMAC computation in downstream mode is completed.");
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ets_hmac_disable();
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esp_crypto_dma_lock_release();
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return err;
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}
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esp_err_t esp_hmac_jtag_disable()
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{
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esp_crypto_dma_lock_acquire();
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REG_WRITE(HMAC_SET_INVALIDATE_JTAG_REG, 1);
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esp_crypto_dma_lock_release();
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ESP_LOGD(TAG, "Invalidate JTAG result register. JTAG disabled.");
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return ESP_OK;
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}
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