encrypt_audio.cpp

CryptoFractions encrypt_audio(vector<float> signal, int startIndex, int sampleSize, const char *keysFilePath, const long precision) {
	
	vector<int64_t> intSignal;
	CryptoFractions encryptedSignal;
	int numerator;
	int endIndex = startIndex + sampleSize;
	
	for (int i = startIndex; i < endIndex; i += 1) {
		numerator = int(signal[i] * precision);
		encryptedSignal.numerators.push_back(numerator);
		encryptedSignal.denominators.push_back(1);
	}

	int val;

	EncryptionInfo info = read_encryption_info(keysFilePath);

	Plaintext signalArray = info.cryptocontext->MakePackedPlaintext(encryptedSignal.numerators);
	
	Plaintext ones = info.cryptocontext->MakePackedPlaintext(encryptedSignal.denominators);
	
	Ciphertext<DCRTPoly> encSignal = info.cryptocontext->Encrypt(info.keypair.publicKey, signalArray);
	
	// For now, the denominator will be 1. We keep track of the precision adjustments separately and deal with that once we are ready to decrypt the result
	Ciphertext<DCRTPoly> encSignalDen = info.cryptocontext->Encrypt(info.keypair.publicKey, ones);
	
	encryptedSignal.encryptedNumerators = encSignal;
	encryptedSignal.encryptedDenominators = encSignalDen;

	return encryptedSignal;
}