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| #include <iostream>
#include <cstdlib>
#include "LWE.h"
#include "FHEW.h"
#include "distrib.h"
using namespace std;
void help(char* cmd) {
cerr << "\nusage: " << cmd << " n\n\n"
<< " Generate a secret key sk and evaluation key ek, and repeat the following test n times:\n"
<< " - generate random bits b1,b2,b3,b4\n"
<< " - compute ciphertexts c1, c2, c3 and c4 encrypting b1, b2, b3 and b4 under sk\n"
<< " - homomorphically compute the encrypted (c1 NAND c2) NAND (c3 NAND c4) \n"
<< " - decrypt all the intermediate results and check correctness \n"
<< "\n If any of the tests fails, print ERROR and stop immediately.\n\n";
exit(0);
}
int cleartext_gate(int v1, int v2, BinGate gate){
switch(gate)
{
case OR: return v1 || v2;
case AND: return v1 && v2;
case NOR: return not(v1 || v2);
case NAND: return not(v1 && v2);
default: cerr << "\n This gate does not exists \n"; exit(1); return 0;
}
}
void cerr_gate(BinGate gate){
switch(gate)
{
case OR: cerr << " OR\t"; return;
case AND: cerr << " AND\t"; return;
case NOR: cerr << " NOR\t"; return;
case NAND: cerr << " NAND\t"; return;
}
}
int main(int argc, char *argv[]) {
if (argc != 2) help(argv[0]);
int count = atoi(argv[1]);
cerr << "Setting up FHEW \n";
FHEW::Setup();
cerr << "Generating secret key ... ";
LWE::SecretKey LWEsk;
LWE::KeyGen(LWEsk);
cerr << " Done.\n";
cerr << "Generating evaluation key ... this may take a while ... ";
FHEW::EvalKey EK;
FHEW::KeyGen(&EK, LWEsk);
cerr << " Done.\n\n";
cerr << "Testing depth-2 homomorphic circuits " << count << " times.\n";
cerr << "Circuit shape : (a GATE NOT(b)) GATE (c GATE d)\n\n";
int v1,v2,sv1 = 2,sv2 = 2;
LWE::CipherText se1, se2, e1, e2, e12;
for (int i = 1; i <= 3*count; ++i) {
if (i % 3){
v1 = rand()%2;
v2 = rand()%2;
LWE::Encrypt(&e1, LWEsk, v1);
LWE::Encrypt(&e2, LWEsk, v2);
if (i%3 == 1){
cerr << " NOT\tEnc(" << v2 << ") = ";
FHEW::HomNOT(&e2, e2);
int notv2 = LWE::Decrypt(LWEsk, e2);
cerr << "Enc(" << notv2 << ")" << endl;
if (not (notv2 == not(v2))){
cerr << "\n ERROR: incorrect NOT Homomorphic computation at iteration " << i+1 << "\n";
exit(1);
}
v2 = not v2;
}
}
else {
v1 = sv1;
v2 = sv2;
e1 = se1;
e2 = se2;
}
BinGate gate = static_cast<BinGate>(rand()%4);
cerr << "Enc(" << v1 << ")";
cerr_gate(gate);
cerr << "Enc(" << v2 << ") = ";
FHEW::HomGate(&e12, gate, EK, e1, e2);
int v12 = LWE::Decrypt(LWEsk, e12);
cerr << "Enc(" << v12 << ")";
cerr << endl;
if (i % 3 == 1){
sv1 = v12;
se1 = e12;
}
if (i % 3 == 2){
sv2 = v12;
se2 = e12;
}
if (i % 3 == 0)
cerr << endl;
if (cleartext_gate(v1, v2, gate) != v12)
{ cerr << "\n ERROR: incorrect Homomorphic Gate computation at iteration " << i+1 << "\n";
exit(1);
}
}
cerr << "\nPassed all tests!\n\n";
} |
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