When two CPUs read the area of the DPORT and the area of the APB, the result is corrupted for the CPU that read the APB area. And another CPU has valid data. The method of eliminating this error. Before reading the registers of the DPORT, make a preliminary reading of the APB register. In this case, the joint access of the two CPUs to the registers of the APB and the DPORT is successful.
387 lines
10 KiB
C
387 lines
10 KiB
C
/**
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* \brief AES block cipher, ESP32 hardware accelerated version
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* Based on mbedTLS FIPS-197 compliant version.
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* Additions Copyright (C) 2016-2017, Espressif Systems (Shanghai) PTE Ltd
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/*
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* The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
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*
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* http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
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* http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
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*/
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#include <string.h>
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#include "mbedtls/aes.h"
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#include "hwcrypto/aes.h"
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#include "soc/dport_reg.h"
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#include "soc/hwcrypto_reg.h"
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#include <sys/lock.h>
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#include <freertos/FreeRTOS.h>
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#include "soc/cpu.h"
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#include <stdio.h>
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/* AES uses a spinlock mux not a lock as the underlying block operation
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only takes 208 cycles (to write key & compute block), +600 cycles
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for DPORT protection but +3400 cycles again if you use a full sized lock.
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For CBC, CFB, etc. this may mean that interrupts are disabled for a longer
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period of time for bigger lengths. However at the moment this has to happen
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anyway due to DPORT protection...
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*/
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static portMUX_TYPE aes_spinlock = portMUX_INITIALIZER_UNLOCKED;
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void esp_aes_acquire_hardware( void )
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{
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/* newlib locks lazy initialize on ESP-IDF */
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portENTER_CRITICAL(&aes_spinlock);
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/* Enable AES hardware */
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DPORT_REG_SET_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_AES);
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/* Clear reset on digital signature & secure boot units,
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otherwise AES unit is held in reset also. */
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DPORT_REG_CLR_BIT(DPORT_PERI_RST_EN_REG,
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DPORT_PERI_EN_AES
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| DPORT_PERI_EN_DIGITAL_SIGNATURE
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| DPORT_PERI_EN_SECUREBOOT);
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}
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void esp_aes_release_hardware( void )
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{
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/* Disable AES hardware */
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DPORT_REG_SET_BIT(DPORT_PERI_RST_EN_REG, DPORT_PERI_EN_AES);
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/* Don't return other units to reset, as this pulls
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reset on RSA & SHA units, respectively. */
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DPORT_REG_CLR_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_AES);
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portEXIT_CRITICAL(&aes_spinlock);
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}
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void esp_aes_init( esp_aes_context *ctx )
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{
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bzero( ctx, sizeof( esp_aes_context ) );
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}
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void esp_aes_free( esp_aes_context *ctx )
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{
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if ( ctx == NULL ) {
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return;
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}
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bzero( ctx, sizeof( esp_aes_context ) );
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}
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/*
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* AES key schedule (same for encryption or decryption, as hardware handles schedule)
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*
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*/
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int esp_aes_setkey( esp_aes_context *ctx, const unsigned char *key,
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unsigned int keybits )
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{
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if (keybits != 128 && keybits != 192 && keybits != 256) {
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return MBEDTLS_ERR_AES_INVALID_KEY_LENGTH;
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}
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ctx->key_bytes = keybits / 8;
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memcpy(ctx->key, key, ctx->key_bytes);
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return 0;
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}
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/*
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* Helper function to copy key from esp_aes_context buffer
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* to hardware key registers.
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*
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* Call only while holding esp_aes_acquire_hardware().
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*/
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static inline void esp_aes_setkey_hardware( esp_aes_context *ctx, int mode)
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{
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const uint32_t MODE_DECRYPT_BIT = 4;
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unsigned mode_reg_base = (mode == ESP_AES_ENCRYPT) ? 0 : MODE_DECRYPT_BIT;
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memcpy((uint32_t *)AES_KEY_BASE, ctx->key, ctx->key_bytes);
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DPORT_REG_WRITE(AES_MODE_REG, mode_reg_base + ((ctx->key_bytes / 8) - 2));
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}
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/* Run a single 16 byte block of AES, using the hardware engine.
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*
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* Call only while holding esp_aes_acquire_hardware().
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*/
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static inline void esp_aes_block(const void *input, void *output)
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{
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const uint32_t *input_words = (const uint32_t *)input;
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uint32_t *output_words = (uint32_t *)output;
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uint32_t *mem_block = (uint32_t *)AES_TEXT_BASE;
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for(int i = 0; i < 4; i++) {
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mem_block[i] = input_words[i];
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}
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DPORT_REG_WRITE(AES_START_REG, 1);
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while (DPORT_REG_READ(AES_IDLE_REG) != 1) { }
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esp_dport_access_read_buffer(output_words, (uint32_t)&mem_block[0], 4);
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}
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/*
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* AES-ECB block encryption
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*/
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int esp_internal_aes_encrypt( esp_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, ESP_AES_ENCRYPT);
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esp_aes_block(input, output);
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esp_aes_release_hardware();
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return 0;
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}
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void esp_aes_encrypt( esp_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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esp_internal_aes_encrypt(ctx, input, output);
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}
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/*
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* AES-ECB block decryption
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*/
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int esp_internal_aes_decrypt( esp_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, ESP_AES_DECRYPT);
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esp_aes_block(input, output);
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esp_aes_release_hardware();
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return 0;
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}
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void esp_aes_decrypt( esp_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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esp_internal_aes_decrypt(ctx, input, output);
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}
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/*
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* AES-ECB block encryption/decryption
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*/
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int esp_aes_crypt_ecb( esp_aes_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, mode);
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esp_aes_block(input, output);
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esp_aes_release_hardware();
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return 0;
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}
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/*
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* AES-CBC buffer encryption/decryption
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*/
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int esp_aes_crypt_cbc( esp_aes_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output )
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{
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int i;
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uint32_t *output_words = (uint32_t *)output;
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const uint32_t *input_words = (const uint32_t *)input;
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uint32_t *iv_words = (uint32_t *)iv;
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unsigned char temp[16];
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if ( length % 16 ) {
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return ( ERR_ESP_AES_INVALID_INPUT_LENGTH );
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}
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, mode);
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if ( mode == ESP_AES_DECRYPT ) {
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while ( length > 0 ) {
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memcpy(temp, input_words, 16);
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esp_aes_block(input_words, output_words);
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for ( i = 0; i < 4; i++ ) {
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output_words[i] = output_words[i] ^ iv_words[i];
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}
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memcpy( iv_words, temp, 16 );
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input_words += 4;
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output_words += 4;
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length -= 16;
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}
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} else { // ESP_AES_ENCRYPT
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while ( length > 0 ) {
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for ( i = 0; i < 4; i++ ) {
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output_words[i] = input_words[i] ^ iv_words[i];
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}
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esp_aes_block(output_words, output_words);
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memcpy( iv_words, output_words, 16 );
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input_words += 4;
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output_words += 4;
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length -= 16;
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}
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}
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esp_aes_release_hardware();
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return 0;
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}
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/*
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* AES-CFB128 buffer encryption/decryption
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*/
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int esp_aes_crypt_cfb128( esp_aes_context *ctx,
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int mode,
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size_t length,
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size_t *iv_off,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output )
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{
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int c;
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size_t n = *iv_off;
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, ESP_AES_ENCRYPT);
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if ( mode == ESP_AES_DECRYPT ) {
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while ( length-- ) {
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if ( n == 0 ) {
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esp_aes_block(iv, iv );
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}
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c = *input++;
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*output++ = (unsigned char)( c ^ iv[n] );
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iv[n] = (unsigned char) c;
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n = ( n + 1 ) & 0x0F;
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}
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} else {
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while ( length-- ) {
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if ( n == 0 ) {
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esp_aes_block(iv, iv );
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}
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iv[n] = *output++ = (unsigned char)( iv[n] ^ *input++ );
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n = ( n + 1 ) & 0x0F;
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}
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}
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*iv_off = n;
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esp_aes_release_hardware();
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return 0;
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}
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/*
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* AES-CFB8 buffer encryption/decryption
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*/
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int esp_aes_crypt_cfb8( esp_aes_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output )
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{
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unsigned char c;
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unsigned char ov[17];
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, ESP_AES_ENCRYPT);
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while ( length-- ) {
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memcpy( ov, iv, 16 );
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esp_aes_block(iv, iv);
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if ( mode == ESP_AES_DECRYPT ) {
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ov[16] = *input;
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}
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c = *output++ = (unsigned char)( iv[0] ^ *input++ );
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if ( mode == ESP_AES_ENCRYPT ) {
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ov[16] = c;
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}
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memcpy( iv, ov + 1, 16 );
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}
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esp_aes_release_hardware();
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return 0;
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}
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/*
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* AES-CTR buffer encryption/decryption
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*/
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int esp_aes_crypt_ctr( esp_aes_context *ctx,
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size_t length,
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size_t *nc_off,
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unsigned char nonce_counter[16],
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unsigned char stream_block[16],
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const unsigned char *input,
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unsigned char *output )
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{
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int c, i;
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size_t n = *nc_off;
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esp_aes_acquire_hardware();
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esp_aes_setkey_hardware(ctx, ESP_AES_ENCRYPT);
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while ( length-- ) {
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if ( n == 0 ) {
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esp_aes_block(nonce_counter, stream_block);
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for ( i = 16; i > 0; i-- )
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if ( ++nonce_counter[i - 1] != 0 ) {
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break;
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}
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}
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c = *input++;
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*output++ = (unsigned char)( c ^ stream_block[n] );
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n = ( n + 1 ) & 0x0F;
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}
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*nc_off = n;
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esp_aes_release_hardware();
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return 0;
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}
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