Bootstrapping Function Doubt

[divyesh98]

I tried using bootstrap function, but it seemed to give incorrect result. Can anyone explain this behavior?!

Attaching Code and result for reference.

// Includes
#include <stdio.h>
#include
#include
#include
#include
#include
#include
#include <sys/time.h>
#include
// Multi-processing
#include <sys/wait.h>
#include <unistd.h>
//#include <tbb/parallel_for.h>
// tfhe-lib
#include "tfhe.h"
#include "tfhe_garbage_collector.h"
#include "lwesamples.h"
#include "lwekey.h"
#include "lweparams.h"
#include "polynomials.h"
#include "tfhe_gate_bootstrapping_functions.h"

using namespace std;
using namespace std::chrono;

int32_t main(int32_t argc, char** argv){

//generate params
int32_t minimum_lambda = 80;
TFheGateBootstrappingParameterSet *params = new_default_gate_bootstrapping_parameters(minimum_lambda);

const LweParams *in_out_params = params -> in_out_params;
LweKey *lwe_key = new_LweKey(params -> in_out_params);

lweKeyGen(lwe_key);

TGswKey *tgsw_key = new_TGswKey(params->tgsw_params);
tGswKeyGen(tgsw_key);
LweBootstrappingKey *bootkey = new_LweBootstrappingKey(params->ks_t, params->ks_basebit, params->in_out_params,
                                                  params->tgsw_params);
tfhe_createLweBootstrappingKey(bootkey, lwe_key, tgsw_key);
TFheGateBootstrappingSecretKeySet *keyset = new_random_gate_bootstrapping_secret_keyset(params);
const LweBootstrappingKeyFFT *bs_key = keyset->cloud.bkFFT;
const TFheGateBootstrappingCloudKeySet * cloudkeyset = new TFheGateBootstrappingCloudKeySet(params, bootkey, bs_key);

//parameters generated

int slots = 700;
double alpha = pow(2, -30);
int x = 10;

Torus32 phase = modSwitchToTorus32(x, slots);

LweSample* cipher1 = new_LweSample_array(1, in_out_params);
LweSample* cipher2 = new_LweSample_array(1, in_out_params);

//encrypting with lwekey
lweSymEncrypt(cipher1 + 0, phase, alpha, lwe_key);

//noiseless encryption
lweNoiselessTrivial(cipher2 + 0, phase, in_out_params);

cout << "Original value of integer is " << x << endl;

//bootstrap operations for cipher1
tfhe_bootstrap(cipher2 + 0, keyset->cloud.bk, phase, cipher2 + 0);
Torus32 phase1 = lweSymDecrypt(cipher2 + 0, lwe_key, slots);	
cout << "Bootstrapped value of the Noiseless cipher = " << modSwitchFromTorus32(phase1, slots) << endl;; 

tfhe_bootstrap(cipher1 + 0, keyset->cloud.bk, phase, cipher1 + 0);
phase1 = lweSymDecrypt(cipher1 + 0, lwe_key, slots);	
cout << "Bootstrapped value of the Lwe Encrypted cipher = " << modSwitchFromTorus32(phase1, slots) << endl;; 
return 0;

}