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HMAC: adding downstream JTAG Re-enable support

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Closes IDF-802
This commit is contained in:
Sachin Billore
2020-09-17 23:16:53 +05:30
parent 8b1d39bf53
commit 0e5cf0f34d
2 changed files with 92 additions and 0 deletions
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60
components/esp32s2/esp_hmac.c
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@@ -12,9 +12,17 @@
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "esp32s2/rom/hmac.h"
#include "esp_hmac.h"
#include "esp_crypto_lock.h"
#include "esp_efuse.h"
#include "esp_efuse_table.h"
#include "soc/hwcrypto_reg.h"
#include "soc/system_reg.h"
#include "esp_log.h"
static const char *TAG = "esp_hmac";
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;
@@ -44,3 +52,55 @@ esp_err_t esp_hmac_calculate(hmac_key_id_t key_id,
}
}
esp_err_t esp_hmac_jtag_enable(hmac_key_id_t key_id, const uint8_t *token)
{
esp_err_t err;
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_HARD_DIS_JTAG)) {
ESP_LOGE(TAG, "JTAG disabled permanently.");
return ESP_FAIL;
}
esp_crypto_dma_lock_acquire();
ets_hmac_enable();
/* Token updating into HMAC module. */
for (int i = 0; i < 32; i += 4) {
uint32_t key_word;
memcpy(&key_word, &token[i], 4);
REG_WRITE(DPORT_JTAG_CTRL_0_REG + i, __builtin_bswap32(key_word));
}
err = ets_hmac_calculate_downstream(convert_key_type(key_id), ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_JTAG);
if (err != ETS_OK) {
ESP_LOGE(TAG, "HMAC downstream JTAG enable mode setting failed.");
return ESP_FAIL;
}
ESP_LOGD(TAG, "HMAC computation in downstream mode is completed.");
ets_hmac_disable();
esp_crypto_dma_lock_release();
return ESP_OK;
}
esp_err_t esp_hmac_jtag_disable()
{
esp_crypto_dma_lock_acquire();
REG_WRITE(HMAC_SET_INVALIDATE_JTAG_REG, 1);
esp_crypto_dma_lock_release();
ESP_LOGD(TAG, "Invalidate JTAG result register. JTAG disabled.");
return ESP_OK;
}