p5.cpp

string secretKeyStoragePath = storagePathStr;
secretKeyStoragePath += "/encryption_info_priK.txt";
string publicKeyStoragePath = storagePathStr;
publicKeyStoragePath += "/encryption_info_pubK.txt";

Serialized serializedPublicKey, serializedSecretKey;

// Retrieving secret key
const char *skFile = secretKeyStoragePath.c_str();
FILE* secretKeyFile = fopen(skFile, "r");
if (secretKeyFile == 0)
	printf("failed to open %s\n", secretKeyStoragePath.c_str());
char readBufferSK[65536];
FileReadStream sSK(secretKeyFile, readBufferSK, sizeof(readBufferSK));
serializedSecretKey.ParseStream(sSK);
fclose(secretKeyFile);

// Retrieving public key
const char *pkFile = publicKeyStoragePath.c_str();
FILE* publicKeyFile = fopen(pkFile, "r");
char readBufferPK[65536];
FileReadStream sPK(publicKeyFile, readBufferPK, sizeof(readBufferPK));
if (publicKeyFile == 0)
	printf("failed to open %s\n", publicKeyStoragePath.c_str());
serializedPublicKey.ParseStream(sPK);
fclose(publicKeyFile);

// Deserializing the secret key and retriving parameters
cc = CryptoContextFactory<DCRTPoly>::DeserializeAndCreateContext(privK);
const auto encodingParams = cc->GetCryptoParameters()->GetEncodingParams();
const auto elementParams = cc->GetCryptoParameters()->GetElementParams();
usint m = elementParams->GetCyclotomicOrder();
PackedEncoding::SetParams(m, encodingParams);

// Deserializing Crypto Keys
LPPrivateKey<DCRTPoly> sk = cc->deserializeSecretKey(serializedSecretKey);
LPPublicKey<DCRTPoly> pk = cc->deserializePublicKey(serializedPublicKey);

if (!sk) {
	cerr << "Could not deserialize secret key" << endl;
	return 0;
}

if (!pk) {
	cerr << "Could not deserialize public key" << endl;
	return 0;
}

// Retrieving evaluation keys for multiplication and addition
Serialized ccEmk;
if (!SerializableHelper::ReadSerializationFromFile(storagePathStr + "/key-eval-mult.txt", &ccEmk)) {
	cerr << "I cannot read serialization from " << storagePathStr << "/key-eval-mult.txt" << endl;
	return 0;
}

Serialized ccEsk;
if (!SerializableHelper::ReadSerializationFromFile(storagePathStr + "/key-eval-sum.txt", &ccEsk)) {
	cerr << "I cannot read serialization from " << storagePathStr << "/key-eval-sum.txt" << endl;
	return 0;
}

// Deserializing eval keys
cc->DeserializeEvalMultKey(ccEmk);
cc->DeserializeEvalSumKey(ccEsk);