Infineon: Switch to 1.9.0 code base, add xmc7000 family support, refactor memory layer
diff --git a/boot/espressif/hal/src/secure_boot.c b/boot/espressif/hal/src/secure_boot.c
new file mode 100644
index 0000000..9cb24be
--- /dev/null
+++ b/boot/espressif/hal/src/secure_boot.c
@@ -0,0 +1,248 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <string.h>
+#include "sdkconfig.h"
+#include "esp_log.h"
+#include "esp_secure_boot.h"
+#include "bootloader_flash_priv.h"
+#include "bootloader_sha.h"
+#include "bootloader_utility.h"
+#include "esp_image_format.h"
+#include "esp_efuse.h"
+#include "esp_efuse_table.h"
+
+/* The following API implementations are used only when called
+ * from the bootloader code.
+ */
+
+#ifdef CONFIG_SECURE_BOOT_V2_ENABLED
+
+#define ALIGN_UP(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
+static const char *TAG = "secure_boot_v2";
+
+/* A signature block is valid when it has correct magic byte, crc and image digest. */
+static esp_err_t validate_signature_block(const ets_secure_boot_sig_block_t *block, int block_num, const uint8_t *image_digest)
+{
+ if (block->magic_byte != ETS_SECURE_BOOT_V2_SIGNATURE_MAGIC) {
+ // All signature blocks have been parsed, no new signature block present.
+ ESP_LOGD(TAG, "Signature block(%d) invalid/absent.", block_num);
+ return ESP_FAIL;
+ }
+ if (block->block_crc != esp_rom_crc32_le(0, (uint8_t *)block, CRC_SIGN_BLOCK_LEN)) {
+ ESP_LOGE(TAG, "Magic byte correct but incorrect crc.");
+ return ESP_FAIL;
+ }
+ if (memcmp(image_digest, block->image_digest, ESP_SECURE_BOOT_DIGEST_LEN)) {
+ ESP_LOGE(TAG, "Magic byte & CRC correct but incorrect image digest.");
+ return ESP_FAIL;
+ } else {
+ ESP_LOGD(TAG, "valid signature block(%d) found", block_num);
+ return ESP_OK;
+ }
+ return ESP_FAIL;
+}
+
+/* Generates the public key digests of the valid public keys in an image's
+ signature block, verifies each signature, and stores the key digests in the
+ public_key_digests structure.
+
+ @param flash_offset Image offset in flash
+ @param flash_size Image size in flash (not including signature block)
+ @param[out] public_key_digests Pointer to structure to hold the key digests for valid sig blocks
+
+
+ Note that this function doesn't read any eFuses, so it doesn't know if the
+ keys are ultimately trusted by the hardware or not
+
+ @return - ESP_OK if no signatures failed to verify, or if no valid signature blocks are found at all.
+ - ESP_FAIL if there's a valid signature block that doesn't verify using the included public key (unexpected!)
+*/
+static esp_err_t s_calculate_image_public_key_digests(uint32_t flash_offset, uint32_t flash_size, esp_image_sig_public_key_digests_t *public_key_digests)
+{
+ esp_err_t ret;
+ uint8_t image_digest[ESP_SECURE_BOOT_DIGEST_LEN] = {0};
+ uint8_t __attribute__((aligned(4))) key_digest[ESP_SECURE_BOOT_DIGEST_LEN] = {0};
+ size_t sig_block_addr = flash_offset + ALIGN_UP(flash_size, FLASH_SECTOR_SIZE);
+
+ ESP_LOGD(TAG, "calculating public key digests for sig blocks of image offset 0x%x (sig block offset 0x%x)", flash_offset, sig_block_addr);
+
+ bzero(public_key_digests, sizeof(esp_image_sig_public_key_digests_t));
+
+ ret = bootloader_sha256_flash_contents(flash_offset, sig_block_addr - flash_offset, image_digest);
+ if (ret != ESP_OK) {
+ ESP_LOGE(TAG, "error generating image digest, %d", ret);
+ return ret;
+ }
+
+ ESP_LOGD(TAG, "reading signature(s)");
+ const ets_secure_boot_signature_t *signatures = bootloader_mmap(sig_block_addr, sizeof(ets_secure_boot_signature_t));
+ if (signatures == NULL) {
+ ESP_LOGE(TAG, "bootloader_mmap(0x%x, 0x%x) failed", sig_block_addr, sizeof(ets_secure_boot_signature_t));
+ return ESP_FAIL;
+ }
+
+ /* Validating Signature block */
+ for (unsigned i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
+ const ets_secure_boot_sig_block_t *block = &signatures->block[i];
+
+ ret = validate_signature_block(block, i, image_digest);
+ if (ret != ESP_OK) {
+ ret = ESP_OK; // past the last valid signature block
+ break;
+ }
+
+ /* Generating the SHA of the public key components in the signature block */
+ bootloader_sha256_handle_t sig_block_sha;
+ sig_block_sha = bootloader_sha256_start();
+ bootloader_sha256_data(sig_block_sha, &block->key, sizeof(block->key));
+ bootloader_sha256_finish(sig_block_sha, key_digest);
+
+ // Check we can verify the image using this signature and this key
+ uint8_t temp_verified_digest[ESP_SECURE_BOOT_DIGEST_LEN];
+ bool verified = ets_rsa_pss_verify(&block->key, block->signature, image_digest, temp_verified_digest);
+
+ if (!verified) {
+ /* We don't expect this: the signature blocks before we enable secure boot should all be verifiable or invalid,
+ so this is a fatal error
+ */
+ ret = ESP_FAIL;
+ ESP_LOGE(TAG, "Secure boot key (%d) verification failed.", i);
+ break;
+ }
+ ESP_LOGD(TAG, "Signature block (%d) is verified", i);
+ /* Copy the key digest to the buffer provided by the caller */
+ memcpy((void *)public_key_digests->key_digests[i], key_digest, ESP_SECURE_BOOT_DIGEST_LEN);
+ public_key_digests->num_digests++;
+ }
+
+ if (ret == ESP_OK && public_key_digests->num_digests > 0) {
+ ESP_LOGI(TAG, "Digests successfully calculated, %d valid signatures (image offset 0x%x)",
+ public_key_digests->num_digests, flash_offset);
+ }
+
+ bootloader_munmap(signatures);
+ return ret;
+}
+
+esp_err_t check_and_generate_secure_boot_keys(void)
+{
+ esp_err_t ret;
+#ifdef CONFIG_IDF_TARGET_ESP32
+ esp_efuse_purpose_t secure_boot_key_purpose[SECURE_BOOT_NUM_BLOCKS] = {
+ ESP_EFUSE_KEY_PURPOSE_SECURE_BOOT_V2,
+ };
+ esp_efuse_coding_scheme_t coding_scheme = esp_efuse_get_coding_scheme(EFUSE_BLK_SECURE_BOOT);
+ if (coding_scheme != EFUSE_CODING_SCHEME_NONE) {
+ ESP_LOGE(TAG, "No coding schemes are supported in secure boot v2.(Detected scheme: 0x%x)", coding_scheme);
+ return ESP_ERR_NOT_SUPPORTED;
+ }
+#else
+ esp_efuse_purpose_t secure_boot_key_purpose[SECURE_BOOT_NUM_BLOCKS] = {
+ ESP_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST0,
+ ESP_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST1,
+ ESP_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST2,
+ };
+#endif // CONFIG_IDF_TARGET_ESP32
+
+ /* Verify the bootloader */
+ esp_image_metadata_t bootloader_data = { 0 };
+ ret = esp_image_verify_bootloader_data(&bootloader_data);
+ if (ret != ESP_OK) {
+ ESP_LOGE(TAG, "bootloader image appears invalid! error %d", ret);
+ return ret;
+ }
+
+ /* Initialize all efuse block entries to invalid (max) value */
+ esp_efuse_block_t blocks[SECURE_BOOT_NUM_BLOCKS] = {[0 ... SECURE_BOOT_NUM_BLOCKS-1] = EFUSE_BLK_KEY_MAX};
+ /* Check if secure boot digests are present */
+ bool has_secure_boot_digest = false;
+ for (unsigned i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
+ bool tmp_has_key = esp_efuse_find_purpose(secure_boot_key_purpose[i], &blocks[i]);
+ if (tmp_has_key) { // For ESP32: esp_efuse_find_purpose() always returns True, need to check whether the key block is used or not.
+ tmp_has_key &= !esp_efuse_key_block_unused(blocks[i]);
+ }
+ has_secure_boot_digest |= tmp_has_key;
+ }
+
+ esp_image_sig_public_key_digests_t boot_key_digests = {0};
+ ESP_LOGI(TAG, "Secure boot digests %s", has_secure_boot_digest ? "already present":"absent, generating..");
+
+ if (!has_secure_boot_digest) {
+ /* Generate the bootloader public key digests */
+ ret = s_calculate_image_public_key_digests(bootloader_data.start_addr, bootloader_data.image_len - SIG_BLOCK_PADDING, &boot_key_digests);
+ if (ret != ESP_OK) {
+ ESP_LOGE(TAG, "Bootloader signature block is invalid");
+ return ret;
+ }
+
+ if (boot_key_digests.num_digests == 0) {
+ ESP_LOGE(TAG, "No valid bootloader signature blocks found.");
+ return ESP_FAIL;
+ }
+ ESP_LOGI(TAG, "%d signature block(s) found appended to the bootloader.", boot_key_digests.num_digests);
+
+ ESP_LOGI(TAG, "Burning public key hash to eFuse");
+ ret = esp_efuse_write_keys(secure_boot_key_purpose, boot_key_digests.key_digests, boot_key_digests.num_digests);
+ if (ret != ESP_OK) {
+ if (ret == ESP_ERR_NOT_ENOUGH_UNUSED_KEY_BLOCKS) {
+ ESP_LOGE(TAG, "Bootloader signatures(%d) more than available key slots.", boot_key_digests.num_digests);
+ } else {
+ ESP_LOGE(TAG, "Failed to write efuse block with purpose (err=0x%x). Can't continue.", ret);
+ }
+ return ret;
+ }
+ } else {
+ for (unsigned i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
+ /* Check if corresponding digest slot is used or not */
+ if (blocks[i] == EFUSE_BLK_KEY_MAX) {
+ ESP_LOGD(TAG, "SECURE_BOOT_DIGEST%d slot is not used", i);
+ continue;
+ }
+
+#if SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
+ if (esp_efuse_get_digest_revoke(i)) {
+ continue;
+ }
+#endif
+ if (esp_efuse_get_key_dis_read(blocks[i])) {
+ ESP_LOGE(TAG, "Key digest (BLK%d) read protected, aborting...", blocks[i]);
+ return ESP_FAIL;
+ }
+ if (esp_efuse_block_is_empty(blocks[i])) {
+ ESP_LOGE(TAG, "%d eFuse block is empty, aborting...", blocks[i]);
+ return ESP_FAIL;
+ }
+ esp_efuse_set_key_dis_write(blocks[i]);
+ ret = esp_efuse_read_block(blocks[i], boot_key_digests.key_digests[boot_key_digests.num_digests], 0,
+ sizeof(boot_key_digests.key_digests[0]) * 8);
+ if (ret) {
+ ESP_LOGE(TAG, "Error during reading %d eFuse block (err=0x%x)", blocks[i], ret);
+ return ret;
+ }
+ boot_key_digests.num_digests++;
+ }
+ if (boot_key_digests.num_digests == 0) {
+ ESP_LOGE(TAG, "No valid pre-loaded public key digest in eFuse");
+ return ESP_FAIL;
+ }
+ ESP_LOGW(TAG, "Using pre-loaded public key digest in eFuse");
+ }
+
+#if SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
+ /* Revoke the empty signature blocks */
+ if (boot_key_digests.num_digests < SECURE_BOOT_NUM_BLOCKS) {
+ /* The revocation index can be 0, 1, 2. Bootloader count can be 1,2,3. */
+ for (unsigned i = boot_key_digests.num_digests; i < SECURE_BOOT_NUM_BLOCKS; i++) {
+ ESP_LOGI(TAG, "Revoking empty key digest slot (%d)...", i);
+ esp_efuse_set_digest_revoke(i);
+ }
+ }
+#endif // SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
+ return ESP_OK;
+}
+
+#endif // CONFIG_SECURE_BOOT_V2_ENABLED