mirror of
https://github.com/espressif/esp-idf.git
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547 lines
17 KiB
C
547 lines
17 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "esp_private/esp_crypto_lock_internal.h"
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#include "memory_checks.h"
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#include "unity_fixture.h"
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#include "soc/soc_caps.h"
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#include "esp_log.h"
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const static char *TAG = "test_ds";
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#if CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rom/efuse.h"
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#include "esp32s2/rom/digital_signature.h"
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#include "esp32s2/rom/aes.h"
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#include "esp32s2/rom/sha.h"
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#include "esp32s2/rom/hmac.h"
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#include "soc/soc_memory_layout.h"
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#elif CONFIG_IDF_TARGET_ESP32C3
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#include "esp32c3/rom/efuse.h"
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#include "esp32c3/rom/digital_signature.h"
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#include "esp32c3/rom/hmac.h"
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#elif CONFIG_IDF_TARGET_ESP32S3
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#include "esp32s3/rom/efuse.h"
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#include "esp32s3/rom/digital_signature.h"
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#include "esp32s3/rom/aes.h"
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#include "esp32s3/rom/sha.h"
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#elif CONFIG_IDF_TARGET_ESP32C6
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#include "esp32c6/rom/efuse.h"
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#include "esp32c6/rom/digital_signature.h"
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#include "esp32c6/rom/aes.h"
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#include "esp32c6/rom/sha.h"
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#elif CONFIG_IDF_TARGET_ESP32H2
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#include "esp32h2/rom/efuse.h"
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#include "esp32h2/rom/digital_signature.h"
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#include "esp32h2/rom/aes.h"
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#include "esp32h2/rom/sha.h"
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#elif CONFIG_IDF_TARGET_ESP32P4
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#include "esp32p4/rom/efuse.h"
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#include "esp32p4/rom/digital_signature.h"
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#include "esp32p4/rom/aes.h"
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#include "esp32p4/rom/sha.h"
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#endif
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#define ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL (0x1) /*!< HMAC peripheral problem */
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#define ESP_ERR_HW_CRYPTO_DS_INVALID_KEY (0x2) /*!< given HMAC key isn't correct, HMAC peripheral problem */
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#define ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST (0x4) /*!< message digest check failed, result is invalid */
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#define ESP_ERR_HW_CRYPTO_DS_INVALID_PADDING (0x5) /*!< padding check failed, but result is produced anyway and can be read*/
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#define ESP_DS_IV_BIT_LEN 128
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#define ESP_DS_IV_LEN (ESP_DS_IV_BIT_LEN / 8)
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#define ESP_DS_SIGNATURE_MAX_BIT_LEN SOC_RSA_MAX_BIT_LEN
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#define ESP_DS_SIGNATURE_MD_BIT_LEN 256
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#define ESP_DS_SIGNATURE_M_PRIME_BIT_LEN 32
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#define ESP_DS_SIGNATURE_L_BIT_LEN 32
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#define ESP_DS_SIGNATURE_PADDING_BIT_LEN 64
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#define ESP_DS_C_LEN (((ESP_DS_SIGNATURE_MAX_BIT_LEN * 3 \
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+ ESP_DS_SIGNATURE_MD_BIT_LEN \
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+ ESP_DS_SIGNATURE_M_PRIME_BIT_LEN \
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+ ESP_DS_SIGNATURE_L_BIT_LEN \
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+ ESP_DS_SIGNATURE_PADDING_BIT_LEN) / 8))
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typedef enum {
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ESP_DS_RSA_1024 = (1024 / 32) - 1,
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ESP_DS_RSA_2048 = (2048 / 32) - 1,
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ESP_DS_RSA_3072 = (3072 / 32) - 1,
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ESP_DS_RSA_4096 = (4096 / 32) - 1
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} esp_digital_signature_length_t;
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typedef struct esp_digital_signature_data {
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esp_digital_signature_length_t rsa_length;
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uint32_t iv[ESP_DS_IV_BIT_LEN / 32];
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uint8_t c[ESP_DS_C_LEN];
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} esp_ds_data_t;
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typedef struct {
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uint32_t Y[ESP_DS_SIGNATURE_MAX_BIT_LEN / 32];
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uint32_t M[ESP_DS_SIGNATURE_MAX_BIT_LEN / 32];
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uint32_t Rb[ESP_DS_SIGNATURE_MAX_BIT_LEN / 32];
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uint32_t M_prime;
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uint32_t length;
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} esp_ds_p_data_t;
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#define NUM_RESULTS 10
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#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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#define DS_MAX_BITS (4096)
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#else
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#define DS_MAX_BITS (ETS_DS_MAX_BITS)
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#endif
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typedef struct {
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uint8_t iv[ETS_DS_IV_LEN];
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ets_ds_p_data_t p_data;
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uint8_t expected_c[ETS_DS_C_LEN];
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uint8_t hmac_key_idx;
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uint32_t expected_results[NUM_RESULTS][DS_MAX_BITS / 32];
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} encrypt_testcase_t;
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#if DS_MAX_BITS == 4096
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#define RSA_LEN (ESP_DS_RSA_4096)
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#include "digital_signature_test_cases_4096.h"
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#elif DS_MAX_BITS == 3072
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#define RSA_LEN (ESP_DS_RSA_3072)
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#include "digital_signature_test_cases_3072.h"
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#endif
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_Static_assert(NUM_RESULTS == NUM_MESSAGES, "expected_results size should be the same as NUM_MESSAGES in generated header");
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#if !CONFIG_IDF_TARGET_ESP32S2
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#include "esp_private/periph_ctrl.h"
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#include "hal/ds_hal.h"
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#include "hal/ds_ll.h"
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#include "hal/hmac_hal.h"
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#include "hal/hmac_ll.h"
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static void ds_acquire_enable(void)
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{
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HMAC_RCC_ATOMIC() {
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hmac_ll_enable_bus_clock(true);
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hmac_ll_reset_register();
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}
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periph_module_enable(PERIPH_SHA_MODULE);
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DS_RCC_ATOMIC() {
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ds_ll_enable_bus_clock(true);
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ds_ll_reset_register();
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}
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hmac_hal_start();
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}
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static void ds_disable_release(void)
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{
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ds_hal_finish();
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DS_RCC_ATOMIC() {
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ds_ll_enable_bus_clock(false);
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}
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periph_module_disable(PERIPH_SHA_MODULE);
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HMAC_RCC_ATOMIC() {
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hmac_ll_enable_bus_clock(false);
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}
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}
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static esp_err_t esp_ds_start_sign(const void *message, const esp_ds_data_t *data, uint32_t key_id)
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{
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ds_acquire_enable();
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uint32_t conf_error = hmac_hal_configure(HMAC_OUTPUT_DS, key_id);
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if (conf_error) {
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ds_disable_release();
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return ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL;
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}
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ds_hal_start();
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while (ds_hal_busy() != 0) { }
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size_t rsa_len = (data->rsa_length + 1) * 4;
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ds_hal_write_private_key_params(data->c);
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ds_hal_configure_iv((uint32_t *)data->iv);
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ds_hal_write_message(message, rsa_len);
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ds_hal_start_sign();
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return ESP_OK;
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}
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static esp_err_t esp_ds_finish_sign(void *signature, const esp_ds_data_t *data)
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{
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unsigned rsa_len = (data->rsa_length + 1) * 4;
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while (ds_hal_busy()) { }
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ds_signature_check_t sig_check_result = ds_hal_read_result((uint8_t *) signature, (size_t) rsa_len);
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esp_err_t return_value = ESP_OK;
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if (sig_check_result == DS_SIGNATURE_MD_FAIL || sig_check_result == DS_SIGNATURE_PADDING_AND_MD_FAIL) {
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return_value = ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST;
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}
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if (sig_check_result == DS_SIGNATURE_PADDING_FAIL) {
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return_value = ESP_ERR_HW_CRYPTO_DS_INVALID_PADDING;
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}
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hmac_hal_clean();
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ds_disable_release();
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return return_value;
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}
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static esp_err_t esp_ds_sign(const void *message,
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const esp_ds_data_t *data,
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uint32_t key_id,
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void *signature)
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{
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esp_err_t result = esp_ds_start_sign(message, data, key_id);
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if (result != ESP_OK) {
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return result;
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}
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while (ds_hal_busy()) { }
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return esp_ds_finish_sign(signature, data);
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}
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static esp_err_t esp_ds_encrypt_params(esp_ds_data_t *data,
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const void *iv,
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const esp_ds_p_data_t *p_data,
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const void *key)
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{
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if (!p_data) {
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return ESP_ERR_INVALID_ARG;
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}
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esp_err_t result = ESP_OK;
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periph_module_enable(PERIPH_AES_MODULE);
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periph_module_enable(PERIPH_SHA_MODULE);
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ets_ds_data_t *ds_data = (ets_ds_data_t *) data;
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const ets_ds_p_data_t *ds_plain_data = (const ets_ds_p_data_t *) p_data;
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ets_ds_result_t ets_result = ets_ds_encrypt_params(ds_data, iv, ds_plain_data, key, ETS_DS_KEY_HMAC);
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if (ets_result == ETS_DS_INVALID_PARAM) {
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result = ESP_ERR_INVALID_ARG;
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}
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periph_module_disable(PERIPH_SHA_MODULE);
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periph_module_disable(PERIPH_AES_MODULE);
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return result;
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}
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#else /* !CONFIG_IDF_TARGET_ESP32S2 */
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static void ds_acquire_enable(void)
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{
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ets_hmac_enable();
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ets_ds_enable();
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}
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static void ds_disable_release(void)
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{
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ets_ds_disable();
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ets_hmac_disable();
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}
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static esp_err_t esp_ds_start_sign(const void *message,
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const esp_ds_data_t *data,
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uint32_t key_id)
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{
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ds_acquire_enable();
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int r = ets_hmac_calculate_downstream(ETS_EFUSE_BLOCK_KEY0 + (ets_efuse_block_t) key_id,
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ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE);
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if (r != ETS_OK) {
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ds_disable_release();
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return ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL;
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}
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ets_ds_data_t *ds_data = (ets_ds_data_t *) data;
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ets_ds_result_t result = ets_ds_start_sign(message, ds_data);
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// ETS_DS_INVALID_PARAM only happens if a parameter is NULL or data->rsa_length is wrong
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// We checked all of that already
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assert(result != ETS_DS_INVALID_PARAM);
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if (result == ETS_DS_INVALID_KEY) {
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ds_disable_release();
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return ESP_ERR_HW_CRYPTO_DS_INVALID_KEY;
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}
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return ESP_OK;
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}
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esp_err_t esp_ds_finish_sign(void *signature, const esp_ds_data_t *data)
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{
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ets_ds_result_t result = ets_ds_finish_sign(signature, (ets_ds_data_t*) data);
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esp_err_t return_value = ESP_OK;
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assert(result != ETS_DS_INVALID_PARAM);
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if (result == ETS_DS_INVALID_DIGEST) {
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return_value = ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST;
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}
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if (result == ETS_DS_INVALID_PADDING) {
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return_value = ESP_ERR_HW_CRYPTO_DS_INVALID_PADDING;
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}
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int res = ets_hmac_invalidate_downstream(ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE);
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assert(res == ETS_OK); // should not fail if called with correct purpose
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(void)res;
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ds_disable_release();
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return return_value;
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}
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static esp_err_t esp_ds_sign(const void *message,
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const esp_ds_data_t *data,
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uint32_t key_id,
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void *signature)
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{
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esp_err_t result = esp_ds_start_sign(message, data, key_id);
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if (result != ESP_OK) {
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return result;
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}
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while (ets_ds_is_busy()) { }
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return esp_ds_finish_sign(signature, (void *)data);
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}
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static esp_err_t esp_ds_encrypt_params(esp_ds_data_t *data,
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const void *iv,
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const esp_ds_p_data_t *p_data,
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const void *key)
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{
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assert(esp_ptr_internal(p_data) && esp_ptr_word_aligned(p_data));
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esp_err_t result = ESP_OK;
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ets_aes_enable();
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ets_sha_enable();
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ets_ds_data_t *ds_data = (ets_ds_data_t *) data;
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const ets_ds_p_data_t *ds_plain_data = (const ets_ds_p_data_t *) p_data;
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ets_ds_result_t ets_result = ets_ds_encrypt_params(ds_data, iv, ds_plain_data, key, ETS_DS_KEY_HMAC);
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if (ets_result == ETS_DS_INVALID_PARAM) {
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result = ESP_ERR_INVALID_ARG;
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}
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ets_sha_disable();
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ets_aes_disable();
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return result;
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}
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#endif /* !CONFIG_IDF_TARGET_ESP32S2 */
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TEST_GROUP(ds);
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TEST_SETUP(ds)
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{
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test_utils_record_free_mem();
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TEST_ESP_OK(test_utils_set_leak_level(0, ESP_LEAK_TYPE_CRITICAL, ESP_COMP_LEAK_GENERAL));
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}
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TEST_TEAR_DOWN(ds)
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{
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test_utils_finish_and_evaluate_leaks(test_utils_get_leak_level(ESP_LEAK_TYPE_WARNING, ESP_COMP_LEAK_ALL),
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test_utils_get_leak_level(ESP_LEAK_TYPE_CRITICAL, ESP_COMP_LEAK_ALL));
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}
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TEST(ds, digital_signature_parameter_encryption)
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{
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for (int i = 0; i < NUM_CASES; i++) {
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ESP_LOGI(TAG, "Encrypting test case %d.", i);
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const encrypt_testcase_t *t = &test_cases[i];
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esp_ds_data_t result = { };
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esp_ds_p_data_t p_data;
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memcpy(p_data.Y, t->p_data.Y, DS_MAX_BITS / 8);
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memcpy(p_data.M, t->p_data.M, DS_MAX_BITS / 8);
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memcpy(p_data.Rb, t->p_data.Rb, DS_MAX_BITS / 8);
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p_data.M_prime = t->p_data.M_prime;
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p_data.length = t->p_data.length;
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esp_err_t r = esp_ds_encrypt_params(&result, t->iv, &p_data,
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test_hmac_keys[t->hmac_key_idx]);
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ESP_LOGI(TAG, "Encrypting test case %d done", i);
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TEST_ASSERT_EQUAL(ESP_OK, r);
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TEST_ASSERT_EQUAL(t->p_data.length, result.rsa_length);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(t->iv, result.iv, ETS_DS_IV_LEN);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(t->expected_c, result.c, ETS_DS_C_LEN);
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}
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}
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// This test uses the HMAC_KEY_BLOCK_1 eFuse key which hasn't been burned by burn_hmac_keys().
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// HMAC_KEY_BLOCK_1 is usually used for HMAC upstream (user access) tests.
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TEST(ds, digital_signature_wrong_hmac_key_purpose)
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = RSA_LEN;
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const char *message = "test";
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// HMAC fails in that case because it checks for the correct purpose
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TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL, esp_ds_start_sign(message, &ds_data, HMAC_KEY_BLOCK_1));
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}
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// This test uses the HMAC_KEY_BLOCK_1 eFuse key which hasn't been burned by burn_hmac_keys().
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// HMAC_KEY_BLOCK_1 is usually used for HMAC upstream (user access) tests.
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TEST(ds, digital_signature_blocking_wrong_hmac_key_purpose)
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = RSA_LEN;
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const char *message = "test";
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uint8_t signature_data [128 * 4];
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// HMAC fails in that case because it checks for the correct purpose
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TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL, esp_ds_sign(message, &ds_data, HMAC_KEY_BLOCK_1, signature_data));
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}
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TEST(ds, digital_signature_operation)
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{
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for (int i = 0; i < NUM_CASES; i++) {
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ESP_LOGI(TAG, "Running test case %d.", i);
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const encrypt_testcase_t *t = &test_cases[i];
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// copy encrypt parameter test case into ds_data structure
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esp_ds_data_t ds_data = { };
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memcpy(ds_data.iv, t->iv, ETS_DS_IV_LEN);
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memcpy(ds_data.c, t->expected_c, ETS_DS_C_LEN);
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ds_data.rsa_length = t->p_data.length;
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for (int j = 0; j < NUM_MESSAGES; j++) {
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uint8_t signature[DS_MAX_BITS / 8] = { 0 };
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ESP_LOGD(TAG, " ... message %d", j);
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esp_err_t ds_r = esp_ds_start_sign(test_messages[j],
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&ds_data,
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t->hmac_key_idx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, &ds_data);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(t->expected_results[j], signature, sizeof(signature));
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}
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#if CONFIG_IDF_TARGET_ESP32C3
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ets_hmac_invalidate_downstream(ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE);
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#endif
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}
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}
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TEST(ds, digital_signature_blocking_operation)
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{
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for (int i = 0; i < NUM_CASES; i++) {
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ESP_LOGI(TAG, "Running test case %d.", i);
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const encrypt_testcase_t *t = &test_cases[i];
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// copy encrypt parameter test case into ds_data structure
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esp_ds_data_t ds_data = { };
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memcpy(ds_data.iv, t->iv, ETS_DS_IV_LEN);
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memcpy(ds_data.c, t->expected_c, ETS_DS_C_LEN);
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ds_data.rsa_length = t->p_data.length;
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uint8_t signature[DS_MAX_BITS / 8] = { 0 };
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#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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esp_err_t ds_r = esp_ds_start_sign(test_messages[0],
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&ds_data,
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t->hmac_key_idx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, &ds_data);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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#else
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esp_err_t ds_r = esp_ds_sign(test_messages[0],
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&ds_data,
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t->hmac_key_idx,
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signature);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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#endif
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TEST_ASSERT_EQUAL_HEX8_ARRAY(t->expected_results[0], signature, sizeof(signature));
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}
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}
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TEST(ds, digital_signature_invalid_data)
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{
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// Set up a valid test case
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const encrypt_testcase_t *t = &test_cases[0];
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esp_ds_data_t ds_data = { };
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memcpy(ds_data.iv, t->iv, ETS_DS_IV_LEN);
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memcpy(ds_data.c, t->expected_c, ETS_DS_C_LEN);
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ds_data.rsa_length = t->p_data.length;
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|
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uint8_t signature[DS_MAX_BITS / 8] = { 0 };
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const uint8_t zero[DS_MAX_BITS / 8] = { 0 };
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|
|
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// Corrupt the IV one bit at a time, rerun and expect failure
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for (int bit = 0; bit < 128; bit++) {
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ESP_LOGD(TAG, "Corrupting IV bit %d.", bit);
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ds_data.iv[bit / 8] ^= 1 << (bit % 8);
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|
|
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esp_err_t ds_r = esp_ds_start_sign(test_messages[0], &ds_data, t->hmac_key_idx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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|
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ds_r = esp_ds_finish_sign(signature, &ds_data);
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TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST, ds_r);
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|
|
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TEST_ASSERT_EQUAL_HEX8_ARRAY(zero, signature, DS_MAX_BITS / 8);
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ds_data.iv[bit / 8] ^= 1 << (bit % 8);
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|
}
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|
|
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// Corrupt encrypted key data one bit at a time, rerun and expect failure
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ESP_LOGD(TAG, "Corrupting C.");
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for (int bit = 0; bit < ETS_DS_C_LEN * 8; bit++) {
|
|
ESP_LOGD(TAG, "Corrupting C bit %d.", bit);
|
|
ds_data.c[bit / 8] ^= 1 << (bit % 8);
|
|
|
|
esp_err_t ds_r = esp_ds_start_sign(test_messages[0], &ds_data, t->hmac_key_idx);
|
|
TEST_ASSERT_EQUAL(ESP_OK, ds_r);
|
|
|
|
ds_r = esp_ds_finish_sign(signature, &ds_data);
|
|
TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST, ds_r);
|
|
|
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TEST_ASSERT_EQUAL_HEX8_ARRAY(zero, signature, DS_MAX_BITS / 8);
|
|
|
|
ds_data.c[bit / 8] ^= 1 << (bit % 8);
|
|
}
|
|
}
|
|
|
|
TEST_GROUP_RUNNER(ds)
|
|
{
|
|
RUN_TEST_CASE(ds, digital_signature_parameter_encryption);
|
|
RUN_TEST_CASE(ds, digital_signature_wrong_hmac_key_purpose);
|
|
RUN_TEST_CASE(ds, digital_signature_blocking_wrong_hmac_key_purpose);
|
|
RUN_TEST_CASE(ds, digital_signature_operation);
|
|
RUN_TEST_CASE(ds, digital_signature_blocking_operation);
|
|
RUN_TEST_CASE(ds, digital_signature_invalid_data);
|
|
}
|