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53 lines
1.2 KiB
53 lines
1.2 KiB
//
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// Created by o.likhogub on 10/7/2023.
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//
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#include "TransmissionModule.h"
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#define MSG_LENGTH 5
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#define ECC_LENGTH 4
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#define TOTAL_LENGTH (MSG_LENGTH + ECC_LENGTH)
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void TransmissionModule::decrypt(uint8_t *data, size_t data_size, uint8_t *output_data)
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{
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size_t posn, len, inc = 5;
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cipher->clear();
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cipher->setKey(encryptionKey, key_size);
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cipher->setIV(iv, iv_size);
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memset(buffer, 0xBA, sizeof(buffer));
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for (posn = 0; posn < auth_size; posn += inc) {
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len = auth_size - posn;
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if (len > inc)
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len = inc;
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cipher->addAuthData(authdata + posn, len);
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}
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for (posn = 0; posn < data_size; posn += inc) {
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len = data_size - posn;
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if (len > inc)
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len = inc;
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cipher->decrypt(buffer + posn, data + posn, len);
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}
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memcpy(output_data, buffer, data_size);
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}
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bool TransmissionModule::receive(uint8_t &sensor_id, MeasureData &data)
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{
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uint8_t buf[TOTAL_LENGTH];
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if (!transmitterModule->receive(buf, TOTAL_LENGTH)) {
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return false;
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}
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uint8_t msg[MSG_LENGTH];
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if (!reedSolomonModule->decode(buf, msg)) {
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return false;
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}
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sensor_id = msg[0];
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memcpy((void *) &data, msg+1, 4);
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return true;
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}
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