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hmac: Added Downstream JTAG enable mode for esp32c3

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If JTAG is disabled temporarily by burning SOFT_DIS_JTAG, it can be
re-enabled temporarily through esp_hmac_jtag_enable API
This commit is contained in:
Sachin Parekh
2021-08-31 14:32:53 +05:30
parent 96b204bc9e
commit c215bb04f6
4 changed files with 96 additions and 35 deletions
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56
components/esp32c3/esp_hmac.c
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@@ -16,14 +16,20 @@
#include "driver/periph_ctrl.h"
#include "esp32c3/rom/hmac.h"
#include "esp32c3/rom/ets_sys.h"
#include "esp_efuse.h"
#include "esp_efuse_table.h"
#include "esp_hmac.h"
#include "esp_log.h"
#include "esp_crypto_lock.h"
#include "soc/hwcrypto_reg.h"
#include "hal/hmac_hal.h"
#define SHA256_BLOCK_SZ 64
#define SHA256_PAD_SZ 8
static const char *TAG = "esp_hmac";
/**
* @brief Apply the HMAC padding without the embedded length.
*
@@ -130,3 +136,53 @@ esp_err_t esp_hmac_calculate(hmac_key_id_t key_id,
return ESP_OK;
}
static ets_efuse_block_t convert_key_type(hmac_key_id_t key_id) {
return ETS_EFUSE_BLOCK_KEY0 + (ets_efuse_block_t) key_id;
}
esp_err_t esp_hmac_jtag_enable(hmac_key_id_t key_id, const uint8_t *token)
{
int ets_status;
esp_err_t err = ESP_OK;
if ((!token) || (key_id >= HMAC_KEY_MAX))
return ESP_ERR_INVALID_ARG;
/* Check if JTAG is permanently disabled by HW Disable eFuse */
if (esp_efuse_read_field_bit(ESP_EFUSE_DIS_PAD_JTAG)) {
ESP_LOGE(TAG, "JTAG disabled permanently.");
return ESP_FAIL;
}
esp_crypto_hmac_lock_acquire();
ets_status = ets_jtag_enable_temporarily(token, convert_key_type(key_id));
if (ets_status != ETS_OK) {
// ets_jtag_enable_temporarily returns either ETS_OK or ETS_FAIL
err = ESP_FAIL;
ESP_LOGE(TAG, "JTAG re-enabling failed (%d)", err);
}
ESP_LOGD(TAG, "HMAC computation in downstream mode is completed.");
ets_hmac_disable();
esp_crypto_hmac_lock_release();
return err;
}
esp_err_t esp_hmac_jtag_disable()
{
esp_crypto_hmac_lock_acquire();
REG_SET_BIT(HMAC_SET_INVALIDATE_JTAG_REG, HMAC_INVALIDATE_JTAG);
esp_crypto_hmac_lock_release();
ESP_LOGD(TAG, "Invalidate JTAG result register. JTAG disabled.");
return ESP_OK;
}