void HomeAutomation::encryptPayload(char *data) {
aes128_enc_single(this->key, data + 16);
for (int i = 0; i < 16; i++) {
data[i] = data[16 + i] ^ data[i];
}
aes128_enc_single(this->key, data);
}
static word serverRequestTemperature(byte fd) {
// filling state
uint8_t data[16] = {0}; // 16 bytes block for encryption, which have to be send in hex
data[0] = uint8_t(uint32_t(sharedState->currentTemperature)); // whole part
data[1] = uint8_t(uint32_t(sharedState->currentTemperature * 100) % 100); // fraction part
*(uint32_t*)(data + (16 - sizeof(uint32_t))) = sharedState->lastNonce;
sharedState->lastNonce += 1;
// encrypting the state
aes128_enc_single(encKey, data);
printlnDebug("Sending encrypted state");
BufferFiller bfill = ether.tcpOffset();
bfill.emit_p(sendTemperatureHeader);
bfill.emit_raw((char*)data, sizeof(data));
temperatureSend = 1;
sendEaseTime = millis() + SENDINGEASE;
return bfill.position();
}
