cepetr
7 months ago
parent
2d3df4f23a
commit
b693f4d847
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TREZOR_HAL_SECURE_AES_H
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#define TREZOR_HAL_SECURE_AES_H
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#include <secbool.h>
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#include <stddef.h>
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#include <stdint.h>
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// Initializes secure AES module
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secbool secure_aes_init(void);
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// Encrypts a block of data using AES-256 CBC and DHUK key
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// Input and output must be aligned to 32 bits, size is in bytes
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secbool secure_aes_encrypt(uint32_t* input, size_t size, uint32_t* output);
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// Decrypts a block of data using AES-256 CBC and DHUK key
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// Input and output must be aligned to 32 bits, size is in bytes
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secbool secure_aes_decrypt(uint32_t* input, size_t size, uint32_t* output);
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void secure_aes_test();
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#endif // TREZOR_HAL_SECURE_AES_H
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@ -0,0 +1,117 @@
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <secure_aes.h>
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#include STM32_HAL_H
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#include <stdio.h>
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#include <stm32u5xx_hal_cryp.h>
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secbool secure_aes_init(void) {
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RCC_OscInitTypeDef osc_init_def = {0};
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osc_init_def.OscillatorType = RCC_OSCILLATORTYPE_SHSI;
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osc_init_def.SHSIState = RCC_SHSI_ON;
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// Enable SHSI clock
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if (HAL_RCC_OscConfig(&osc_init_def) != HAL_OK) {
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return secfalse;
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}
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// Enable SAES peripheral clock
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__HAL_RCC_SAES_CLK_ENABLE();
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return sectrue;
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}
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secbool secure_aes_encrypt(uint32_t* input, size_t size, uint32_t* output) {
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CRYP_HandleTypeDef hcryp = {0};
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uint32_t iv[] = {0, 0, 0, 0};
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hcryp.Instance = SAES;
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hcryp.Init.DataType = CRYP_NO_SWAP;
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hcryp.Init.KeySelect = CRYP_KEYSEL_HW;
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hcryp.Init.KeySize = CRYP_KEYSIZE_256B;
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hcryp.Init.pKey = NULL;
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hcryp.Init.pInitVect = iv;
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hcryp.Init.Algorithm = CRYP_AES_CBC;
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hcryp.Init.Header = NULL;
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hcryp.Init.HeaderSize = 0;
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hcryp.Init.DataWidthUnit = CRYP_DATAWIDTHUNIT_WORD;
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hcryp.Init.HeaderWidthUnit = CRYP_HEADERWIDTHUNIT_BYTE;
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hcryp.Init.KeyIVConfigSkip = CRYP_KEYIVCONFIG_ALWAYS;
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hcryp.Init.KeyMode = CRYP_KEYMODE_NORMAL;
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if (HAL_CRYP_Init(&hcryp) != HAL_OK) {
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return secfalse;
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}
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if (HAL_CRYP_Encrypt(&hcryp, input, size, output, HAL_MAX_DELAY) != HAL_OK) {
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return secfalse;
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}
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HAL_CRYP_DeInit(&hcryp);
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return sectrue;
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}
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secbool secure_aes_decrypt(uint32_t* input, size_t size, uint32_t* output) {
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CRYP_HandleTypeDef hcryp = {0};
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uint32_t iv[] = {0, 0, 0, 0};
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hcryp.Instance = SAES;
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hcryp.Init.DataType = CRYP_NO_SWAP;
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hcryp.Init.KeySelect = CRYP_KEYSEL_HW;
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hcryp.Init.KeySize = CRYP_KEYSIZE_256B;
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hcryp.Init.pKey = NULL;
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hcryp.Init.pInitVect = iv;
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hcryp.Init.Algorithm = CRYP_AES_CBC;
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hcryp.Init.Header = NULL;
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hcryp.Init.HeaderSize = 0;
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hcryp.Init.DataWidthUnit = CRYP_DATAWIDTHUNIT_BYTE;
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hcryp.Init.HeaderWidthUnit = CRYP_HEADERWIDTHUNIT_BYTE;
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hcryp.Init.KeyIVConfigSkip = CRYP_KEYIVCONFIG_ALWAYS;
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hcryp.Init.KeyMode = CRYP_KEYMODE_NORMAL;
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if (HAL_CRYP_Init(&hcryp) != HAL_OK) {
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return secfalse;
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}
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if (HAL_CRYP_Decrypt(&hcryp, input, size, output, HAL_MAX_DELAY) != HAL_OK) {
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return secfalse;
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}
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HAL_CRYP_DeInit(&hcryp);
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return sectrue;
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}
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void secure_aes_test() {
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static uint32_t plain_text[4] = {1, 2, 3, 4};
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static uint32_t encrypted_text[4];
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static uint32_t decrypted_text[4];
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secbool status;
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status = secure_aes_encrypt(plain_text, sizeof(plain_text), encrypted_text);
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printf("encryption done (status=%d)\n", status == sectrue);
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status = secure_aes_decrypt(encrypted_text, sizeof(encrypted_text),
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decrypted_text);
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printf("decryption done (status=%d)\n", status == sectrue);
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}
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