esp-idf/components/esp_hw_support/esp_dpa_protection.c
Mahavir Jain 1764a0bd28
crypto: add support for DPA protection configuration in C6/H2
- Technical details covered in section "15.3.2 Anti-DPA Attack Security
Control" chapter of the ESP32-C6 TRM
- Default configuration sets the security level low for the DPA
protection
- This change applies to all the crypto peripherals where the clock
frequency is dynamically adjusted to create randomness in the power
consumption trajectory
- This configuration helps to make the SCA attacks difficult on the
crypto peripherals
2023-06-08 20:37:03 +05:30

40 lines
1.1 KiB
C

/*
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "sdkconfig.h"
#include "soc/hp_system_reg.h"
#include "esp_dpa_protection.h"
static inline void esp_crypto_dpa_set_level(esp_crypto_dpa_sec_level_t level)
{
assert(level >= ESP_CRYPTO_DPA_SEC_LEVEL_LOW && level <= ESP_CRYPTO_DPA_SEC_LEVEL_HIGH);
REG_SET_BIT(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_CFG_SEL);
REG_SET_FIELD(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_LEVEL, level);
}
#if CONFIG_ESP_CRYPTO_DPA_PROTECTION_AT_STARTUP
static void __attribute__((constructor)) esp_crypto_dpa_protection_startup(void)
{
esp_crypto_dpa_set_level(CONFIG_ESP_CRYPTO_DPA_PROTECTION_LEVEL);
}
#endif
void esp_crypto_dpa_protection_enable(esp_crypto_dpa_sec_level_t level)
{
esp_crypto_dpa_set_level(level);
}
void esp_crypto_dpa_protection_disable(void)
{
REG_CLR_BIT(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_CFG_SEL);
}
void esp_crypto_dpa_prot_include_impl(void)
{
// Linker hook, exists for no other purpose
}