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1696be719c
- 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
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include "sdkconfig.h"
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#include "soc/hp_system_reg.h"
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#include "esp_dpa_protection.h"
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static inline void esp_crypto_dpa_set_level(esp_crypto_dpa_sec_level_t level)
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{
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assert(level >= ESP_CRYPTO_DPA_SEC_LEVEL_LOW && level <= ESP_CRYPTO_DPA_SEC_LEVEL_HIGH);
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REG_SET_BIT(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_CFG_SEL);
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REG_SET_FIELD(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_LEVEL, level);
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}
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#if CONFIG_ESP_CRYPTO_DPA_PROTECTION_AT_STARTUP
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static void __attribute__((constructor)) esp_crypto_dpa_protection_startup(void)
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{
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esp_crypto_dpa_set_level(CONFIG_ESP_CRYPTO_DPA_PROTECTION_LEVEL);
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}
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#endif
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void esp_crypto_dpa_protection_enable(esp_crypto_dpa_sec_level_t level)
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{
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esp_crypto_dpa_set_level(level);
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}
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void esp_crypto_dpa_protection_disable(void)
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{
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REG_CLR_BIT(HP_SYSTEM_SEC_DPA_CONF_REG, HP_SYSTEM_SEC_DPA_CFG_SEL);
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}
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void esp_crypto_dpa_prot_include_impl(void)
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{
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// Linker hook, exists for no other purpose
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}
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