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380 lines
13 KiB
C
380 lines
13 KiB
C
// Copyright 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 "unity.h"
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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 <string.h>
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#include "esp_ds.h"
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#define NUM_RESULTS 10
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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][4096/32];
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} encrypt_testcase_t;
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// Generated header (gen_digital_signature_tests.py) defines
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// NUM_HMAC_KEYS, test_hmac_keys, NUM_MESSAGES, NUM_CASES, test_messages[], test_cases[]
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// Some adaptations were made: removed the 512 bit case and changed RSA lengths to the enums from esp_ds.h
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#include "digital_signature_test_cases.h"
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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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TEST_CASE("Digital Signature Parameter Encryption data NULL", "[hw_crypto]")
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{
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const char iv [32];
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esp_ds_p_data_t p_data;
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const char key [32];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_encrypt_params(NULL, iv, &p_data, key));
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}
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TEST_CASE("Digital Signature Parameter Encryption iv NULL", "[hw_crypto]")
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{
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esp_ds_data_t data;
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esp_ds_p_data_t p_data;
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const char key [32];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_encrypt_params(&data, NULL, &p_data, key));
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}
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TEST_CASE("Digital Signature Parameter Encryption p_data NULL", "[hw_crypto]")
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{
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esp_ds_data_t data;
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const char iv [32];
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const char key [32];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_encrypt_params(&data, iv, NULL, key));
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}
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TEST_CASE("Digital Signature Parameter Encryption key NULL", "[hw_crypto]")
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{
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esp_ds_data_t data;
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const char iv [32];
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esp_ds_p_data_t p_data;
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_encrypt_params(&data, iv, &p_data, NULL));
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}
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TEST_CASE("Digital Signature Parameter Encryption", "[hw_crypto]")
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{
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for (int i = 0; i < NUM_CASES; i++) {
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printf("Encrypting test case %d...\n", 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, 4096/8);
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memcpy(p_data.M, t->p_data.M, 4096/8);
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memcpy(p_data.Rb, t->p_data.Rb, 4096/8);
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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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printf("Encrypting test case %d done\n", 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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TEST_CASE("Digital Signature start Invalid message", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = { };
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ds_data.rsa_length = ESP_DS_RSA_4096;
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esp_ds_context_t *ctx;
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(NULL, &ds_data, HMAC_KEY1, &ctx));
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}
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TEST_CASE("Digital Signature start Invalid data", "[hw_crypto]")
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{
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const char *message = "test";
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esp_ds_context_t *ctx;
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, NULL, HMAC_KEY1, &ctx));
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}
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TEST_CASE("Digital Signature start Invalid context", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = ESP_DS_RSA_4096;
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const char *message = "test";
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, &ds_data, HMAC_KEY1, NULL));
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}
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TEST_CASE("Digital Signature RSA length 0", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = 0;
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const char *message = "test";
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, &ds_data, HMAC_KEY1, NULL));
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}
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TEST_CASE("Digital Signature RSA length too long", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = 128;
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const char *message = "test";
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, &ds_data, HMAC_KEY1, NULL));
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}
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TEST_CASE("Digital Signature start HMAC key out of range", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = ESP_DS_RSA_4096;
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esp_ds_context_t *ctx;
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const char *message = "test";
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, &ds_data, HMAC_KEY5 + 1, &ctx));
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_start_sign(message, &ds_data, HMAC_KEY0 - 1, &ctx));
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}
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TEST_CASE("Digital Signature finish Invalid signature ptr", "[hw_crypto]")
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{
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esp_ds_context_t *ctx = NULL;
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_finish_sign(NULL, ctx));
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}
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TEST_CASE("Digital Signature finish Invalid context", "[hw_crypto]")
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{
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_finish_sign(signature_data, NULL));
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}
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TEST_CASE("Digital Signature Blocking Invalid message", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = { };
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ds_data.rsa_length = ESP_DS_RSA_4096;
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(NULL, &ds_data, HMAC_KEY1, signature_data));
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}
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TEST_CASE("Digital Signature Blocking Invalid data", "[hw_crypto]")
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{
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const char *message = "test";
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, NULL, HMAC_KEY1, signature_data));
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}
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TEST_CASE("Digital Signature Blocking Invalid signature ptr", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = ESP_DS_RSA_4096;
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const char *message = "test";
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, &ds_data, HMAC_KEY1, NULL));
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}
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TEST_CASE("Digital Signature Blocking RSA length 0", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = 0;
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const char *message = "test";
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, &ds_data, HMAC_KEY1, signature_data));
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}
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TEST_CASE("Digital Signature Blocking RSA length too long", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = 128;
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const char *message = "test";
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, &ds_data, HMAC_KEY1, signature_data));
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}
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TEST_CASE("Digital Signature Blocking HMAC key out of range", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = 127;
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const char *message = "test";
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uint8_t signature_data [128 * 4];
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, &ds_data, HMAC_KEY5 + 1, signature_data));
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TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_ds_sign(message, &ds_data, HMAC_KEY0 - 1, signature_data));
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}
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#if CONFIG_IDF_ENV_FPGA
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static void burn_hmac_keys(void)
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{
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printf("Burning %d HMAC keys to efuse...\n", NUM_HMAC_KEYS);
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for (int i = 0; i < NUM_HMAC_KEYS; i++) {
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// TODO: vary the purpose across the keys
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ets_efuse_purpose_t purpose = ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE;
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// starting from block 1, block 0 occupied with HMAC upstream test key
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int ets_status = ets_efuse_write_key(ETS_EFUSE_BLOCK_KEY1 + i,
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purpose,
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test_hmac_keys[i], 32);
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if (ets_status == ESP_OK) {
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printf("written DS test key to block [%d]!\n", ETS_EFUSE_BLOCK_KEY1 + i);
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} else {
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printf("writing DS test key to block [%d] failed, maybe written already\n", ETS_EFUSE_BLOCK_KEY1 + i);
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}
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}
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}
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TEST_CASE("Digital Signature wrong HMAC key purpose (FPGA only)", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = ESP_DS_RSA_4096;
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esp_ds_context_t *ctx;
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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_KEY0, &ctx));
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}
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TEST_CASE("Digital Signature Blocking wrong HMAC key purpose (FPGA only)", "[hw_crypto]")
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{
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esp_ds_data_t ds_data = {};
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ds_data.rsa_length = ESP_DS_RSA_4096;
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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_KEY0, signature_data));
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}
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TEST_CASE("Digital Signature Operation (FPGA only)", "[hw_crypto]")
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{
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burn_hmac_keys();
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for (int i = 0; i < NUM_CASES; i++) {
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printf("Running test case %d...\n", 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[4096/8] = { 0 };
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printf(" ... message %d\n", j);
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esp_ds_context_t *esp_ds_ctx;
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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 + 1,
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&esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, esp_ds_ctx);
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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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}
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}
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TEST_CASE("Digital Signature Blocking Operation (FPGA only)", "[hw_crypto]")
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{
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burn_hmac_keys();
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for (int i = 0; i < NUM_CASES; i++) {
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printf("Running test case %d...\n", 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[4096/8] = { 0 };
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esp_ds_context_t *esp_ds_ctx;
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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 + 1,
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&esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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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_CASE("Digital Signature Invalid Data (FPGA only)", "[hw_crypto]")
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{
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burn_hmac_keys();
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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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uint8_t signature[4096/8] = { 0 };
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const uint8_t zero[4096/8] = { 0 };
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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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printf("Corrupting IV bit %d...\n", bit);
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ds_data.iv[bit / 8] ^= 1 << (bit % 8);
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esp_ds_context_t *esp_ds_ctx;
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esp_err_t ds_r = esp_ds_start_sign(test_messages[0], &ds_data, t->hmac_key_idx + 1, &esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST, ds_r);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(zero, signature, 4096/8);
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ds_data.iv[bit / 8] ^= 1 << (bit % 8);
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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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printf("Corrupting C...\n");
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for (int bit = 0; bit < ETS_DS_C_LEN * 8; bit++) {
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printf("Corrupting C bit %d...\n", bit);
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ds_data.c[bit / 8] ^= 1 << (bit % 8);
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esp_ds_context_t *esp_ds_ctx;
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esp_err_t ds_r = esp_ds_start_sign(test_messages[0], &ds_data, t->hmac_key_idx + 1, &esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_OK, ds_r);
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ds_r = esp_ds_finish_sign(signature, esp_ds_ctx);
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TEST_ASSERT_EQUAL(ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST, ds_r);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(zero, signature, 4096/8);
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ds_data.c[bit / 8] ^= 1 << (bit % 8);
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}
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}
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#endif // CONFIG_IDF_ENV_FPGA
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