mbedTLS
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Outline
#include "sdkconfig.h"
#include "esp_aes_internal.h"
#include "mbedtls/aes.h"
#include "hal/aes_hal.h"
#include "hal/aes_types.h"
#include "soc/soc_caps.h"
#include "mbedtls/error.h"
#include <string.h>
#include "esp_aes_dma_priv.h"
valid_key_length(const esp_aes_context *)
esp_aes_init(esp_aes_context *)
esp_aes_free(esp_aes_context *)
esp_aes_setkey(esp_aes_context *, const unsigned char *, unsigned int)
#define AES_PSEUDO_ROUNDS_BASE_LOW
#define AES_PSEUDO_ROUNDS_BASE_MEDIUM
#define AES_PSEUDO_ROUNDS_BASE_HIGH
#define AES_PSEUDO_ROUNDS_INC
#define AES_PSEUDO_ROUNDS_RNG_CNT
Files
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SourceVuESP-IDF Framework and ExamplesmbedTLSport/aes/esp_aes_common.c
 
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/* * AES block cipher, ESP hardware accelerated version, common * Based on mbedTLS FIPS-197 compliant version. * * SPDX-FileCopyrightText: The Mbed TLS Contributors * * SPDX-License-Identifier: Apache-2.0 * * SPDX-FileContributor: 2016-2025 Espressif Systems (Shanghai) CO LTD *//* ... */ /* * The AES block cipher was designed by Vincent Rijmen and Joan Daemen. * * http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf * http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf *//* ... */ #include "sdkconfig.h" #include "esp_aes_internal.h" #include "mbedtls/aes.h" #include "hal/aes_hal.h" #include "hal/aes_types.h" #include "soc/soc_caps.h" #include "mbedtls/error.h" #include <string.h>8 includes #if SOC_AES_SUPPORT_DMA #include "esp_aes_dma_priv.h" #endif bool valid_key_length(const esp_aes_context *ctx) { bool valid_len = (ctx->key_bytes == AES_128_KEY_BYTES) || (ctx->key_bytes == AES_256_KEY_BYTES); #if SOC_AES_SUPPORT_AES_192 valid_len |= ctx->key_bytes == AES_192_KEY_BYTES; #endif return valid_len; }{ ... } void esp_aes_init(esp_aes_context *ctx) { bzero(ctx, sizeof(esp_aes_context)); #if SOC_AES_SUPPORT_DMA && CONFIG_MBEDTLS_AES_USE_INTERRUPT esp_aes_intr_alloc(); #endif }{ ... } void esp_aes_free( esp_aes_context *ctx ) { if ( ctx == NULL ) { return; }{...} bzero( ctx, sizeof( esp_aes_context ) ); }{ ... } /* * AES key schedule (same for encryption or decryption, as hardware handles schedule) * *//* ... */ int esp_aes_setkey( esp_aes_context *ctx, const unsigned char *key, unsigned int keybits ) { #if !SOC_AES_SUPPORT_AES_192 if (keybits == 192) { return MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED; }{...} #endif/* ... */ if (keybits != 128 && keybits != 192 && keybits != 256) { return MBEDTLS_ERR_AES_INVALID_KEY_LENGTH; }{...} ctx->key_bytes = keybits / 8; memcpy(ctx->key, key, ctx->key_bytes); ctx->key_in_hardware = 0; return 0; }{ ... } #ifdef CONFIG_MBEDTLS_AES_USE_PSEUDO_ROUND_FUNC /* The total number of pseudo-rounds randomly inserted in an AES operation are controlled by * configuring the AES_PSEUDO_BASE, AES_PSEUDO_INC parameters. * Users can also set the frequency of random key updates by configuring the AES_PSEUDO_RNG_CNT. * Here, we would be using some pre-decided values for these parameters corresponding to the security needed. * For more information regarding these parameters please refer the TRM. *//* ... */ #define AES_PSEUDO_ROUNDS_BASE_LOW 4 #define AES_PSEUDO_ROUNDS_BASE_MEDIUM 7 #define AES_PSEUDO_ROUNDS_BASE_HIGH 15 #define AES_PSEUDO_ROUNDS_INC 3 #define AES_PSEUDO_ROUNDS_RNG_CNT 75 defines void esp_aes_enable_pseudo_rounds(esp_aes_psuedo_rounds_state_t state) { if (state == ESP_AES_PSEUDO_ROUNDS_DISABLE) { aes_hal_enable_pseudo_rounds(false, 0, 0, 0); }{...} else if (state == ESP_AES_PSEUDO_ROUNDS_LOW) { aes_hal_enable_pseudo_rounds(true, AES_PSEUDO_ROUNDS_BASE_LOW, AES_PSEUDO_ROUNDS_INC, AES_PSEUDO_ROUNDS_RNG_CNT); }{...} else if (state == ESP_AES_PSEUDO_ROUNDS_MEDIUM) { aes_hal_enable_pseudo_rounds(true, AES_PSEUDO_ROUNDS_BASE_MEDIUM, AES_PSEUDO_ROUNDS_INC, AES_PSEUDO_ROUNDS_RNG_CNT); }{...} else { aes_hal_enable_pseudo_rounds(true, AES_PSEUDO_ROUNDS_BASE_HIGH, AES_PSEUDO_ROUNDS_INC, AES_PSEUDO_ROUNDS_RNG_CNT); }{...} }{...} /* ... */#endif /* CONFIG_MBEDTLS_AES_USE_PSEUDO_ROUND_FUNC */
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