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feat(esp_tee): Add support for SECP192R1 curve in TEE secure storage

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This commit is contained in:
Laukik Hase
2025-02-12 17:16:53 +05:30
parent 1e30aa74b5
commit 1e8933d296
13 changed files with 200 additions and 55 deletions
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6
components/esp_tee/Kconfig.projbuild
View File

@ -91,6 +91,12 @@ menu "ESP-TEE (Trusted Execution Environment)"
help
eFuse block ID storing the TEE secure storage encryption key
config SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
bool "Secure Storage: Support signing with the ECDSA SECP192R1 curve"
default n
help
Enable ECDSA signing with the SECP192R1 curve using the TEE secure storage.
config SECURE_TEE_ATTESTATION
bool "Enable Attestation"
default y

4
components/esp_tee/scripts/esp32c6/sec_srv_tbl_default.yml
View File

@ -248,11 +248,11 @@ secure_services:
- id: 177
type: custom
function: esp_tee_sec_storage_get_signature
args: 4
args: 5
- id: 178
type: custom
function: esp_tee_sec_storage_get_pubkey
args: 2
args: 3
- id: 179
type: custom
function: esp_tee_sec_storage_encrypt

4
components/esp_tee/subproject/components/attestation/esp_att_utils_crypto.c
View File

@ -60,7 +60,7 @@ static esp_err_t gen_ecdsa_keypair_secp256r1(esp_att_ecdsa_keypair_t *keypair)
}
}
err = esp_tee_sec_storage_get_pubkey(slot_id, &pubkey);
err = esp_tee_sec_storage_get_pubkey(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1, &pubkey);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch ECDSA pubkey (%d)", err);
return err;
@ -84,7 +84,7 @@ static esp_err_t get_ecdsa_sign_secp256r1(const esp_att_ecdsa_keypair_t *keypair
}
esp_tee_sec_storage_sign_t sign = {};
esp_err_t err = esp_tee_sec_storage_get_signature(ESP_ATT_TK_KEY_ID, (uint8_t *)digest, len, &sign);
esp_err_t err = esp_tee_sec_storage_get_signature(ESP_ATT_TK_KEY_ID, ESP_SEC_STG_KEY_ECDSA_SECP256R1, (uint8_t *)digest, len, &sign);
if (err != ESP_OK) {
return err;
}

9
components/esp_tee/subproject/components/tee_sec_storage/include/esp_tee_sec_storage.h
View File

@ -25,7 +25,8 @@ extern "C" {
*/
typedef enum {
ESP_SEC_STG_KEY_ECDSA_SECP256R1 = 0,
ESP_SEC_STG_KEY_AES256,
ESP_SEC_STG_KEY_AES256 = 1,
ESP_SEC_STG_KEY_ECDSA_SECP192R1 = 2,
ESP_SEC_STG_MAX,
} esp_tee_sec_storage_type_t;
@ -71,23 +72,25 @@ esp_err_t esp_tee_sec_storage_gen_key(uint16_t slot_id, esp_tee_sec_storage_type
* the key pair located in the given secure storage slot.
*
* @param[in] slot_id secure storage slot ID
* @param[in] key_type secure storage key type
* @param[in] hash Message digest
* @param[in] hlen Digest length
* @param[out] out_sign Output context holding the signature
*
* @return esp_err_t ESP_OK on success, appropriate error code otherwise.
*/
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign);
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign);
/**
* @brief Return the public key for the given secure storage slot
*
* @param[in] slot_id secure storage slot ID
* @param[in] key_type secure storage key type
* @param[out] pubkey Output context holding the public key
*
* @return esp_err_t ESP_OK on success, appropriate error code otherwise.
*/
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_pubkey_t *pubkey);
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, esp_tee_sec_storage_pubkey_t *pubkey);
/**
* @brief Check whether the given slot in the secure storage is empty or not

125
components/esp_tee/subproject/components/tee_sec_storage/tee_sec_storage.c
View File

@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -40,6 +40,7 @@
#define AES256_GCM_AAD_LEN 16
#define ECDSA_SECP256R1_KEY_LEN 32
#define ECDSA_SECP192R1_KEY_LEN 24
/* Structure to hold metadata for secure storage slots */
typedef struct {
@ -58,6 +59,12 @@ typedef struct {
uint8_t pub_key[2 * ECDSA_SECP256R1_KEY_LEN]; /* Public key for ECDSA SECP256R1 (X and Y coordinates) */
} __attribute__((aligned(4))) __attribute__((__packed__)) sec_stg_ecdsa_secp256r1_t;
/* Structure to hold ECDSA SECP192R1 key pair */
typedef struct {
uint8_t priv_key[ECDSA_SECP192R1_KEY_LEN]; /* Private key for ECDSA SECP192R1 */
uint8_t pub_key[2 * ECDSA_SECP192R1_KEY_LEN]; /* Public key for ECDSA SECP192R1 (X and Y coordinates) */
} __attribute__((aligned(4))) __attribute__((__packed__)) sec_stg_ecdsa_secp192r1_t;
/* Structure to hold AES-256 GCM key and IV */
typedef struct {
uint8_t key[AES256_GCM_KEY_LEN]; /* Key for AES-256 GCM */
@ -67,6 +74,7 @@ typedef struct {
/* Union to hold different types of cryptographic keys */
typedef union {
sec_stg_ecdsa_secp256r1_t ecdsa_secp256r1; /* ECDSA SECP256R1 key pair */
sec_stg_ecdsa_secp192r1_t ecdsa_secp192r1; /* ECDSA SECP192R1 key pair */
sec_stg_aes256_gcm_t aes256_gcm; /* AES-256 GCM key and IV */
} __attribute__((aligned(4))) __attribute__((__packed__)) sec_stg_key_t;
@ -348,39 +356,69 @@ esp_err_t esp_tee_sec_storage_init(void)
return ESP_OK;
}
static int generate_ecdsa_secp256r1_key(sec_stg_key_t *keyctx)
static int generate_ecdsa_key(sec_stg_key_t *keyctx, esp_tee_sec_storage_type_t key_type)
{
if (keyctx == NULL) {
return -1;
}
ESP_LOGI(TAG, "Generating ECDSA-SECP256R1 private key...");
mbedtls_ecp_group_id curve_id = MBEDTLS_ECP_DP_SECP256R1;
size_t key_len = ECDSA_SECP256R1_KEY_LEN;
if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP192R1) {
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
curve_id = MBEDTLS_ECP_DP_SECP192R1;
key_len = ECDSA_SECP192R1_KEY_LEN;
#else
ESP_LOGE(TAG, "Unsupported key type!");
return -1;
#endif
}
ESP_LOGI(TAG, "Generating ECDSA key for curve %d...", curve_id);
mbedtls_ecdsa_context ctxECDSA;
mbedtls_ecdsa_init(&ctxECDSA);
int ret = mbedtls_ecdsa_genkey(&ctxECDSA, MBEDTLS_ECP_DP_SECP256R1, rand_func, NULL);
int ret = mbedtls_ecdsa_genkey(&ctxECDSA, curve_id, rand_func, NULL);
if (ret != 0) {
ESP_LOGE(TAG, "Failed to generate ECDSA key");
goto exit;
}
ret = mbedtls_mpi_write_binary(&ctxECDSA.MBEDTLS_PRIVATE(d), keyctx->ecdsa_secp256r1.priv_key, ECDSA_SECP256R1_KEY_LEN);
uint8_t *priv_key = (key_type == ESP_SEC_STG_KEY_ECDSA_SECP256R1) ?
keyctx->ecdsa_secp256r1.priv_key :
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
keyctx->ecdsa_secp192r1.priv_key;
#else
NULL;
#endif
uint8_t *pub_key = (key_type == ESP_SEC_STG_KEY_ECDSA_SECP256R1) ?
keyctx->ecdsa_secp256r1.pub_key :
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
keyctx->ecdsa_secp192r1.pub_key;
#else
NULL;
#endif
ret = mbedtls_mpi_write_binary(&ctxECDSA.MBEDTLS_PRIVATE(d), priv_key, key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_mpi_write_binary(&(ctxECDSA.MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X)), &keyctx->ecdsa_secp256r1.pub_key[0], ECDSA_SECP256R1_KEY_LEN);
ret = mbedtls_mpi_write_binary(&(ctxECDSA.MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X)), pub_key, key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_mpi_write_binary(&(ctxECDSA.MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y)), &keyctx->ecdsa_secp256r1.pub_key[ECDSA_SECP256R1_KEY_LEN], ECDSA_SECP256R1_KEY_LEN);
ret = mbedtls_mpi_write_binary(&(ctxECDSA.MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y)), pub_key + key_len, key_len);
if (ret != 0) {
goto exit;
}
buffer_hexdump("Private key", keyctx->ecdsa_secp256r1.priv_key, sizeof(keyctx->ecdsa_secp256r1.priv_key));
buffer_hexdump("Private key", priv_key, key_len);
buffer_hexdump("Public key", pub_key, key_len * 2);
exit:
mbedtls_ecdsa_free(&ctxECDSA);
@ -418,7 +456,10 @@ esp_err_t esp_tee_sec_storage_gen_key(uint16_t slot_id, esp_tee_sec_storage_type
switch (key_type) {
case ESP_SEC_STG_KEY_ECDSA_SECP256R1:
if (generate_ecdsa_secp256r1_key(&keyctx) != 0) {
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
case ESP_SEC_STG_KEY_ECDSA_SECP192R1:
#endif
if (generate_ecdsa_key(&keyctx, key_type) != 0) {
ESP_LOGE(TAG, "Failed to generate ECDSA keypair (%d)", ret);
return ESP_FAIL;
}
@ -437,7 +478,7 @@ esp_err_t esp_tee_sec_storage_gen_key(uint16_t slot_id, esp_tee_sec_storage_type
return secure_storage_write(slot_id, (uint8_t *)&keyctx, sizeof(keyctx), key_type);
}
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign)
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign)
{
if (slot_id > MAX_SEC_STG_SLOT_ID || hash == NULL || out_sign == NULL) {
return ESP_ERR_INVALID_ARG;
@ -447,9 +488,15 @@ esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, siz
return ESP_ERR_INVALID_SIZE;
}
sec_stg_key_t keyctx;
#if !CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP192R1) {
ESP_LOGE(TAG, "Unsupported key type!");
return ESP_ERR_NOT_SUPPORTED;
}
#endif
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(sec_stg_key_t), ESP_SEC_STG_KEY_ECDSA_SECP256R1);
sec_stg_key_t keyctx;
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(sec_stg_key_t), key_type);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch key from slot");
return err;
@ -464,7 +511,19 @@ esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, siz
mbedtls_ecp_keypair_init(&priv_key);
mbedtls_ecdsa_init(&sign_ctx);
int ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &priv_key, keyctx.ecdsa_secp256r1.priv_key, sizeof(keyctx.ecdsa_secp256r1.priv_key));
int ret = -1;
if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP256R1) {
ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &priv_key, keyctx.ecdsa_secp256r1.priv_key, sizeof(keyctx.ecdsa_secp256r1.priv_key));
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
} else if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP192R1) {
ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP192R1, &priv_key, keyctx.ecdsa_secp192r1.priv_key, sizeof(keyctx.ecdsa_secp192r1.priv_key));
#endif
} else {
ESP_LOGE(TAG, "Unsupported key type for signature generation");
err = ESP_ERR_NOT_SUPPORTED;
goto exit;
}
if (ret != 0) {
err = ESP_FAIL;
goto exit;
@ -476,7 +535,7 @@ esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, siz
goto exit;
}
ESP_LOGI(TAG, "Generating ECDSA-SECP256R1 signature...");
ESP_LOGI(TAG, "Generating ECDSA signature...");
ret = mbedtls_ecdsa_sign(&sign_ctx.MBEDTLS_PRIVATE(grp), &r, &s, &sign_ctx.MBEDTLS_PRIVATE(d), hash, hlen,
rand_func, NULL);
@ -486,13 +545,21 @@ esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, siz
goto exit;
}
ret = mbedtls_mpi_write_binary(&r, out_sign->sign_r, ECDSA_SECP256R1_KEY_LEN);
memset(out_sign, 0x00, sizeof(esp_tee_sec_storage_sign_t));
size_t key_len = (key_type == ESP_SEC_STG_KEY_ECDSA_SECP256R1) ? ECDSA_SECP256R1_KEY_LEN :
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
ECDSA_SECP192R1_KEY_LEN;
#else
0;
#endif
ret = mbedtls_mpi_write_binary(&r, out_sign->sign_r, key_len);
if (ret != 0) {
err = ESP_FAIL;
goto exit;
}
ret = mbedtls_mpi_write_binary(&s, out_sign->sign_s, ECDSA_SECP256R1_KEY_LEN);
ret = mbedtls_mpi_write_binary(&s, out_sign->sign_s, key_len);
if (ret != 0) {
err = ESP_FAIL;
goto exit;
@ -508,22 +575,38 @@ exit:
return err;
}
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_pubkey_t *pubkey)
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, esp_tee_sec_storage_pubkey_t *pubkey)
{
if (slot_id > MAX_SEC_STG_SLOT_ID || pubkey == NULL) {
return ESP_ERR_INVALID_ARG;
}
sec_stg_key_t keyctx;
size_t key_len;
uint8_t *pub_key_src;
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(sec_stg_key_t), ESP_SEC_STG_KEY_ECDSA_SECP256R1);
if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP256R1) {
key_len = ECDSA_SECP256R1_KEY_LEN;
pub_key_src = keyctx.ecdsa_secp256r1.pub_key;
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
} else if (key_type == ESP_SEC_STG_KEY_ECDSA_SECP192R1) {
key_len = ECDSA_SECP192R1_KEY_LEN;
pub_key_src = keyctx.ecdsa_secp192r1.pub_key;
#endif
} else {
ESP_LOGE(TAG, "Unsupported key type");
return ESP_ERR_INVALID_ARG;
}
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(sec_stg_key_t), key_type);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch key from slot");
return err;
}
memcpy(pubkey->pub_x, &keyctx.ecdsa_secp256r1.pub_key[0], ECDSA_SECP256R1_KEY_LEN);
memcpy(pubkey->pub_y, &keyctx.ecdsa_secp256r1.pub_key[ECDSA_SECP256R1_KEY_LEN], ECDSA_SECP256R1_KEY_LEN);
// Copy public key components in one shot
memcpy(pubkey->pub_x, pub_key_src, key_len);
memcpy(pubkey->pub_y, pub_key_src + key_len, key_len);
return ESP_OK;
}
@ -618,7 +701,7 @@ static esp_err_t tee_sec_storage_crypt_common(uint16_t slot_id, uint8_t *input,
}
sec_stg_key_t keyctx;
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(keyctx), 1);
esp_err_t err = secure_storage_read(slot_id, (uint8_t *)&keyctx, sizeof(keyctx), ESP_SEC_STG_KEY_AES256);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch key from slot");
return err;

8
components/esp_tee/subproject/components/tee_sec_storage/tee_sec_storage_wrapper.c
View File

@ -18,14 +18,14 @@ esp_err_t esp_tee_sec_storage_gen_key(uint16_t slot_id, esp_tee_sec_storage_type
return esp_tee_service_call_with_noniram_intr_disabled(3, SS_ESP_TEE_SEC_STORAGE_GEN_KEY, slot_id, key_type);
}
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *sign)
esp_err_t esp_tee_sec_storage_get_signature(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *sign)
{
return esp_tee_service_call_with_noniram_intr_disabled(5, SS_ESP_TEE_SEC_STORAGE_GET_SIGNATURE, slot_id, hash, hlen, sign);
return esp_tee_service_call_with_noniram_intr_disabled(6, SS_ESP_TEE_SEC_STORAGE_GET_SIGNATURE, slot_id, key_type, hash, hlen, sign);
}
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_pubkey_t *pubkey)
esp_err_t esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, esp_tee_sec_storage_pubkey_t *pubkey)
{
return esp_tee_service_call_with_noniram_intr_disabled(3, SS_ESP_TEE_SEC_STORAGE_GET_PUBKEY, slot_id, pubkey);
return esp_tee_service_call_with_noniram_intr_disabled(4, SS_ESP_TEE_SEC_STORAGE_GET_PUBKEY, slot_id, key_type, pubkey);
}
bool esp_tee_sec_storage_is_slot_empty(uint16_t slot_id)

8
components/esp_tee/subproject/main/core/esp_secure_services.c
View File

@ -368,7 +368,7 @@ esp_err_t _ss_esp_tee_sec_storage_gen_key(uint16_t slot_id, uint8_t key_type)
return esp_tee_sec_storage_gen_key(slot_id, key_type);
}
esp_err_t _ss_esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign)
esp_err_t _ss_esp_tee_sec_storage_get_signature(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, uint8_t *hash, size_t hlen, esp_tee_sec_storage_sign_t *out_sign)
{
bool valid_addr = ((esp_tee_ptr_in_ree((void *)hash) && esp_tee_ptr_in_ree((void *)out_sign)) &
(esp_tee_ptr_in_ree((void *)(hash + hlen)) &&
@ -379,10 +379,10 @@ esp_err_t _ss_esp_tee_sec_storage_get_signature(uint16_t slot_id, uint8_t *hash,
}
ESP_FAULT_ASSERT(valid_addr);
return esp_tee_sec_storage_get_signature(slot_id, hash, hlen, out_sign);
return esp_tee_sec_storage_get_signature(slot_id, key_type, hash, hlen, out_sign);
}
esp_err_t _ss_esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_pubkey_t *pubkey)
esp_err_t _ss_esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_storage_type_t key_type, esp_tee_sec_storage_pubkey_t *pubkey)
{
bool valid_addr = ((esp_tee_ptr_in_ree((void *)pubkey)) &
(esp_tee_ptr_in_ree((void *)((char *)pubkey + sizeof(esp_tee_sec_storage_pubkey_t)))));
@ -392,7 +392,7 @@ esp_err_t _ss_esp_tee_sec_storage_get_pubkey(uint16_t slot_id, esp_tee_sec_stora
}
ESP_FAULT_ASSERT(valid_addr);
return esp_tee_sec_storage_get_pubkey(slot_id, pubkey);
return esp_tee_sec_storage_get_pubkey(slot_id, key_type, pubkey);
}
esp_err_t _ss_esp_tee_sec_storage_encrypt(uint16_t slot_id, uint8_t *input, uint8_t len, uint8_t *aad,

4
components/esp_tee/test_apps/tee_cli_app/main/tee_srv_sec_str.c
View File

@ -289,7 +289,7 @@ static int tee_sec_stg_sign(int argc, char **argv)
}
esp_tee_sec_storage_sign_t sign = {};
err = esp_tee_sec_storage_get_signature(slot_id, digest, sizeof(digest), &sign);
err = esp_tee_sec_storage_get_signature(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1, digest, sizeof(digest), &sign);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to generate signature!");
goto exit;
@ -307,7 +307,7 @@ static int tee_sec_stg_sign(int argc, char **argv)
free(sign_hexstr);
esp_tee_sec_storage_pubkey_t pubkey = {};
err = esp_tee_sec_storage_get_pubkey(slot_id, &pubkey);
err = esp_tee_sec_storage_get_pubkey(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1, &pubkey);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch public-key!");
goto exit;

4
components/esp_tee/test_apps/tee_test_fw/main/test_esp_tee_att.c
View File

@ -36,7 +36,7 @@
static const char *TAG = "test_esp_tee_att";
extern int verify_ecdsa_secp256r1_sign(const uint8_t *digest, size_t len, const esp_tee_sec_storage_pubkey_t *pubkey, const esp_tee_sec_storage_sign_t *sign);
extern int verify_ecdsa_sign(const uint8_t *digest, size_t len, const esp_tee_sec_storage_pubkey_t *pubkey, const esp_tee_sec_storage_sign_t *sign, bool is_crv_p192);
static uint8_t hexchar_to_byte(char hex)
{
@ -277,7 +277,7 @@ TEST_CASE("Test TEE Attestation - Generate and verify the EAT", "[attestation]")
ESP_LOGI(TAG, "Verifying the generated EAT...");
// Verifying the generated token
TEST_ASSERT_EQUAL(0, verify_ecdsa_secp256r1_sign(digest, sizeof(digest), &pubkey_ctx, &sign_ctx));
TEST_ASSERT_EQUAL(0, verify_ecdsa_sign(digest, sizeof(digest), &pubkey_ctx, &sign_ctx, false));
free(token_buf);
}

76
components/esp_tee/test_apps/tee_test_fw/main/test_esp_tee_sec_stg.c
View File

@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -20,6 +20,7 @@
#include "esp_random.h"
#include "unity.h"
#include "sdkconfig.h"
/* Note: negative value here so that assert message prints a grep-able
error hex value (mbedTLS uses -N for error codes) */
@ -27,11 +28,16 @@
#define SHA256_DIGEST_SZ (32)
#define ECDSA_SECP256R1_KEY_LEN (32)
#define ECDSA_SECP192R1_KEY_LEN (24)
static const char *TAG = "test_esp_tee_sec_storage";
int verify_ecdsa_secp256r1_sign(const uint8_t *digest, size_t len, const esp_tee_sec_storage_pubkey_t *pubkey, const esp_tee_sec_storage_sign_t *sign)
int verify_ecdsa_sign(const uint8_t *digest, size_t len, const esp_tee_sec_storage_pubkey_t *pubkey, const esp_tee_sec_storage_sign_t *sign, bool is_crv_p192)
{
#if !CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
TEST_ASSERT_FALSE(is_crv_p192);
#endif
TEST_ASSERT_NOT_NULL(pubkey);
TEST_ASSERT_NOT_NULL(digest);
TEST_ASSERT_NOT_NULL(sign);
@ -44,7 +50,12 @@ int verify_ecdsa_secp256r1_sign(const uint8_t *digest, size_t len, const esp_tee
mbedtls_ecdsa_context ecdsa_context;
mbedtls_ecdsa_init(&ecdsa_context);
TEST_ASSERT_MBEDTLS_OK(mbedtls_ecp_group_load(&ecdsa_context.MBEDTLS_PRIVATE(grp), MBEDTLS_ECP_DP_SECP256R1));
mbedtls_ecp_group_id curve_id = MBEDTLS_ECP_DP_SECP256R1;
if (is_crv_p192) {
curve_id = MBEDTLS_ECP_DP_SECP192R1;
}
TEST_ASSERT_MBEDTLS_OK(mbedtls_ecp_group_load(&ecdsa_context.MBEDTLS_PRIVATE(grp), curve_id));
size_t plen = mbedtls_mpi_size(&ecdsa_context.MBEDTLS_PRIVATE(grp).P);
TEST_ASSERT_MBEDTLS_OK(mbedtls_mpi_read_binary(&r, sign->sign_r, plen));
@ -81,19 +92,54 @@ TEST_CASE("Test TEE Secure Storage - Sign-verify (ecdsa_secp256r1) with all key-
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1));
esp_tee_sec_storage_sign_t sign = {};
TEST_ESP_OK(esp_tee_sec_storage_get_signature(slot_id, msg_digest, sizeof(msg_digest), &sign));
TEST_ESP_OK(esp_tee_sec_storage_get_signature(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1, msg_digest, sizeof(msg_digest), &sign));
esp_tee_sec_storage_pubkey_t pubkey = {};
TEST_ESP_OK(esp_tee_sec_storage_get_pubkey(slot_id, &pubkey));
TEST_ESP_OK(esp_tee_sec_storage_get_pubkey(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1, &pubkey));
ESP_LOGI(TAG, "Verifying generated signature...");
TEST_ESP_OK(verify_ecdsa_secp256r1_sign(msg_digest, sizeof(msg_digest), &pubkey, &sign));
TEST_ESP_OK(verify_ecdsa_sign(msg_digest, sizeof(msg_digest), &pubkey, &sign, false));
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ASSERT_TRUE(esp_tee_sec_storage_is_slot_empty(slot_id));
}
}
#if CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN
TEST_CASE("Test TEE Secure Storage - Sign-verify (ecdsa_secp192r1) with all key-slot IDs", "[secure_storage]")
{
const size_t buf_sz = 16 * 1024 + 6; // NOTE: Not an exact multiple of SHA block size
unsigned char *message = heap_caps_malloc(buf_sz, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL);
TEST_ASSERT_NOT_NULL(message);
esp_fill_random(message, buf_sz);
uint8_t msg_digest[SHA256_DIGEST_SZ];
TEST_ASSERT_MBEDTLS_OK(mbedtls_sha256(message, buf_sz, msg_digest, false));
free(message);
TEST_ESP_OK(esp_tee_sec_storage_init());
for (uint16_t slot_id = 0; slot_id <= MAX_SEC_STG_SLOT_ID; slot_id++) {
ESP_LOGI(TAG, "Slot ID: %u", slot_id);
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP192R1));
esp_tee_sec_storage_sign_t sign = {};
TEST_ESP_OK(esp_tee_sec_storage_get_signature(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP192R1, msg_digest, sizeof(msg_digest), &sign));
esp_tee_sec_storage_pubkey_t pubkey = {};
TEST_ESP_OK(esp_tee_sec_storage_get_pubkey(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP192R1, &pubkey));
ESP_LOGI(TAG, "Verifying generated signature...");
TEST_ESP_OK(verify_ecdsa_sign(msg_digest, sizeof(msg_digest), &pubkey, &sign, true));
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ASSERT_TRUE(esp_tee_sec_storage_is_slot_empty(slot_id));
}
}
#endif
TEST_CASE("Test TEE Secure Storage - Encrypt-decrypt (aes256_gcm) with all key-slot IDs", "[secure_storage]")
{
const uint8_t SZ = 100;
@ -161,7 +207,9 @@ TEST_CASE("Test TEE Secure Storage - Operations with invalid/non-existent keys",
const uint16_t slot_id = 7;
ESP_LOGI(TAG, "Slot ID: %u - Trying AES operation with ECDSA key...", slot_id);
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1));
esp_tee_sec_storage_type_t key_type = ESP_SEC_STG_KEY_ECDSA_SECP256R1;
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, key_type));
TEST_ESP_ERR(ESP_ERR_NOT_FOUND, esp_tee_sec_storage_encrypt(slot_id, plaintext, SZ, aad, sizeof(aad),
tag, sizeof(tag), ciphertext));
@ -172,7 +220,7 @@ TEST_CASE("Test TEE Secure Storage - Operations with invalid/non-existent keys",
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, ESP_SEC_STG_KEY_AES256));
esp_tee_sec_storage_sign_t sign = {};
TEST_ESP_ERR(ESP_ERR_NOT_FOUND, esp_tee_sec_storage_get_signature(slot_id, msg_digest, sizeof(msg_digest), &sign));
TEST_ESP_ERR(ESP_ERR_NOT_FOUND, esp_tee_sec_storage_get_signature(slot_id, key_type, msg_digest, sizeof(msg_digest), &sign));
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ASSERT_TRUE(esp_tee_sec_storage_is_slot_empty(slot_id));
@ -242,14 +290,16 @@ TEST_CASE("Test TEE Secure Storage - Null Pointer and Zero Length", "[secure_sto
TEST_ESP_ERR(ESP_ERR_INVALID_SIZE, esp_tee_sec_storage_decrypt(slot_id, data, sizeof(data), NULL, 0, tag, 0, data));
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, ESP_SEC_STG_KEY_ECDSA_SECP256R1));
esp_tee_sec_storage_type_t key_type = ESP_SEC_STG_KEY_ECDSA_SECP256R1;
TEST_ESP_OK(esp_tee_sec_storage_gen_key(slot_id, key_type));
esp_tee_sec_storage_sign_t sign = {};
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_signature(slot_id, NULL, sizeof(data), &sign));
TEST_ESP_ERR(ESP_ERR_INVALID_SIZE, esp_tee_sec_storage_get_signature(slot_id, data, 0, &sign));
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_signature(slot_id, data, sizeof(data), NULL));
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_signature(slot_id, key_type, NULL, sizeof(data), &sign));
TEST_ESP_ERR(ESP_ERR_INVALID_SIZE, esp_tee_sec_storage_get_signature(slot_id, key_type, data, 0, &sign));
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_signature(slot_id, key_type, data, sizeof(data), NULL));
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_pubkey(slot_id, NULL));
TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_tee_sec_storage_get_pubkey(slot_id, key_type, NULL));
TEST_ESP_OK(esp_tee_sec_storage_clear_slot(slot_id));
}

2
components/esp_tee/test_apps/tee_test_fw/sdkconfig.ci.ota
View File

@ -7,6 +7,8 @@ CONFIG_PARTITION_TABLE_FILENAME="partitions_tee_ota.csv"
# Increasing Bootloader log verbosity
CONFIG_BOOTLOADER_LOG_LEVEL_DEBUG=y
CONFIG_SECURE_TEE_SEC_STG_SUPPORT_SECP192R1_SIGN=y
# secure storage key slot for attestation
CONFIG_SECURE_TEE_ATT_KEY_SLOT_ID=14

1
components/mbedtls/esp_tee/esp_tee_mbedtls_config.h
View File

@ -42,6 +42,7 @@
#define MBEDTLS_ASN1_PARSE_C
#define MBEDTLS_BIGNUM_C
#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
#define MBEDTLS_ECP_DP_SECP192R1_ENABLED
#define MBEDTLS_ECP_C
#define MBEDTLS_ECDSA_C

4
examples/security/tee/tee_secure_storage/main/tee_main.c
View File

@ -125,7 +125,7 @@ static void example_tee_sec_stg_sign_verify(void *pvParameter)
}
esp_tee_sec_storage_sign_t sign = {};
err = esp_tee_sec_storage_get_signature(KEY_SLOT_ID, msg_digest, sizeof(msg_digest), &sign);
err = esp_tee_sec_storage_get_signature(KEY_SLOT_ID, ESP_SEC_STG_KEY_ECDSA_SECP256R1, msg_digest, sizeof(msg_digest), &sign);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to generate signature!");
goto exit;
@ -134,7 +134,7 @@ static void example_tee_sec_stg_sign_verify(void *pvParameter)
ESP_LOG_BUFFER_HEX("Signature", &sign, sizeof(sign));
esp_tee_sec_storage_pubkey_t pubkey = {};
err = esp_tee_sec_storage_get_pubkey(KEY_SLOT_ID, &pubkey);
err = esp_tee_sec_storage_get_pubkey(KEY_SLOT_ID, ESP_SEC_STG_KEY_ECDSA_SECP256R1, &pubkey);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to fetch public-key!");
goto exit;