84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
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tasmota_crypto.cpp - crypto layer to call bearssl from wireguard
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Copyright (C) 2025 Theo Arends, Stephan Hadinger
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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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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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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 <Arduino.h>
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#include <t_bearssl.h>
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#ifdef ESP32
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#include "freertos/task.h"
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#include "freertos/FreeRTOS.h"
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#include "esp_expression_with_stack.h"
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#endif // ESP32
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//**************************************************************************************************************
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// enable AddLog support within a C++ library
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extern void AddLog(uint32_t loglevel, PGM_P formatP, ...);
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enum LoggingLevels {LOG_LEVEL_NONE, LOG_LEVEL_ERROR, LOG_LEVEL_INFO, LOG_LEVEL_DEBUG, LOG_LEVEL_DEBUG_MORE};
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//**************************************************************************************************************
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#define BR_EC25519_IMPL br_ec_c25519_m15 // BearSSL implementation for Curve 25519
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// we need a global
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static struct dh_curve25519_t {
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uint8_t q[32];
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uint8_t n[32];
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int result;
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} g_dh_curve25519;
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static void run_crypto_scalarmult_curve25519(void) {
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g_dh_curve25519.result = BR_EC25519_IMPL.mul(g_dh_curve25519.q, 32, g_dh_curve25519.n, 32, BR_EC_curve25519);
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}
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extern "C" int crypto_scalarmult_curve25519(unsigned char *q, const unsigned char *n,const unsigned char *p) {
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for (int32_t i=0; i<32; i++) {
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g_dh_curve25519.q[i] = p[i];
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g_dh_curve25519.n[i] = n[31-i];
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}
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#ifdef ESP32
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const char *taskName = pcTaskGetName(NULL);
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if (uxTaskGetStackHighWaterMark(nullptr) < 2000) {
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//Allocate a stack buffer, from heap or as a static form:
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StackType_t *shared_stack = (StackType_t*) heap_caps_malloc(4096 * sizeof(StackType_t), MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL);
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//Allocate a mutex to protect its usage:
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SemaphoreHandle_t lock = xSemaphoreCreateMutex();
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//Call the desired function using the macro helper:
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esp_execute_shared_stack_function(lock,
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shared_stack,
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4096,
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run_crypto_scalarmult_curve25519);
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vSemaphoreDelete(lock);
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free(shared_stack);
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} else {
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run_crypto_scalarmult_curve25519();
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}
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#else
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run_crypto_scalarmult_curve25519();
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#endif
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if (g_dh_curve25519.result) {
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for (int32_t i=0; i<32; i++) {
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q[i] = g_dh_curve25519.q[i];
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}
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return 0; // Success
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} else {
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return 1; // Failure
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}
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}
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