int main()
{
ifstream common("common.ecs"); /* construct file I/O streams */
ifstream public_key("public.ecs");
ifstream message;
ifstream signature;
ECn G,Pub;
int bits,ep;
Big a,b,p,q,x,y,v,u1,u2,r,s,h;
char ifname[13],ofname[13];
miracl *mip=&precision;
/* get public data */
common >> bits;
mip->IOBASE=16;
common >> p >> a >> b >> q >> x >> y;
mip->IOBASE=10;
ecurve(a,b,p,MR_PROJECTIVE);
G=ECn(x,y);
/* get public key of signer */
public_key >> ep >> x;
Pub=ECn(x,ep); // decompress
/* get message */
cout << "signed file = " ;
cin.sync();
cin.getline(ifname,13);
strcpy(ofname,ifname);
strip(ofname);
strcat(ofname,".ecs");
message.open(ifname,ios::binary|ios::in|ios::nocreate);
if (!message)
{ /* no message */
cout << "Unable to open file " << ifname << "\n";
return 0;
}
h=hash(message);
signature.open(ofname,ios::in|ios::nocreate);
if (!signature)
{ /* no signature */
cout << "signature file " << ofname << " does not exist\n";
return 0;
}
signature >> r >> s;
if (r>=q || s>=q)
{
cout << "Signature is NOT verified\n";
return 0;
}
s=inverse(s,q);
u1=(h*s)%q;
u2=(r*s)%q;
G=mul(u2,Pub,u1,G);
G.get(v);
v%=q;
if (v==r) cout << "Signature is verified\n";
else cout << "Signature is NOT verified\n";
return 0;
}
void BaseOT::ByteArrayToPoint(ECn *point, int field_size, BYTE* pBufIdx) {
int itmp;
Big bigtmp;
itmp = (int) (pBufIdx[0]);
bytes_to_big(field_size, (const char*) pBufIdx + 1, bigtmp.getbig());
*point = ECn(bigtmp, itmp);
}
void BaseOT::SampleRandomPoint(ECn *point, int field_size) {
Big bigtmp;
int itmp = rand()%2;
do
{
bigtmp = rand(field_size, 2);
*point = ECn(bigtmp, itmp);
}
while (point_at_infinity(point->get_point()));
}
void SampleRandomPoint(ECn &point, fparams* params) {
Big bigtmp;
int itmp = rand()%2;
do
{
bigtmp = rand(params->secparam, 2);
point = ECn(bigtmp, itmp);
}
while (point_at_infinity(point.get_point()));
}
int main(int argc, char *argv[])
{
int iy,i;
char *line = new char[512];//buffer needs char instead of const char
ofstream fout;
ifstream fin;
time_t seed;
Big tempB,a,b,p,q,x,y,s1,s2;
ECn g;
miracl *mip=&precision;
time(&seed);
irand((long)seed); /* change parameter for different values */
//cout << "Adding EC-ElGamal ciphertexts...." << endl;
a=-3;
mip->IOBASE=16;
b=ecb;
p=ecp;
q=ecq;// order
ecurve(a,b,p,MR_BEST); // means use PROJECTIVE if possible, else AFFINE coordinates
x=ecx;
y=ecy;
g=ECn(x,y);
//Read cipher and multiply
i = 0;
mip->IOBASE=64;
fin.open(PFILE);
s1 = 0;
s2 = 0;
while(fin.getline(line,512)){
x = line;
fin.getline(line,512);
y = line;
//"add" (could not fine add mod)
s1 += x;
s2 += y;
i++;
}
fin.close();
// a stupid way to mod q
x = 1;
s2 = modmult(s2,x,q);
fout.open(TFILE);
fout<<s1<<endl<<s2<<endl;
fout.close();
//free buffer
delete [] line;
return 0;
}
int main(int argc, char *argv[])
{
int m,iy,i,j, n = 2, l = 2;
char *line = new char[512];//buffer needs char instead of const char
ofstream fout;
ifstream fin;
time_t seed;
Big tempB,a,b,p,x,y;
ECn g,s1,s2;
miracl *mip=&precision;
time(&seed);
irand((long)seed); /* change parameter for different values */
if(argc ==3){
n=atoi(argv[1]);
l=atoi(argv[2]);
}
//we need to read all the ciphertexts in
ECn *c1 = new ECn[n];
ECn *c2 = new ECn[n];
cout << "Producing EC-ElGamal Ballots...." << endl;
a=-3;
mip->IOBASE=16;
b=ecb;
p=ecp;
ecurve(a,b,p,MR_BEST); // means use PROJECTIVE if possible, else AFFINE coordinates
x=ecx;
y=ecy;
g=ECn(x,y);
//Read cipher and ballot transpose
mip->IOBASE=64;
fin.open(CFILE);
for(i = 0;i<n;i++){
fin.getline(line,512);
x = line;
fin.getline(line,512);
iy = atoi(line);
c1[i] = ECn(x,iy); //decompress
fin.getline(line,512);
x = line;
fin.getline(line,512);
iy = atoi(line);
c2[i] = ECn(x,iy); //decompress
}
fin.close();
fin.open(BFILE);
fout.open(EBFILE);
for(j=0;j<l;j++){
for(i = 0;i<n;i++){
fin>>m;
if(i == 0){
s1 = m*c1[i];
s2 = m*c2[i];
}
else{
s1 += m*c1[i];
s2 += m*c2[i];
}
}
//write
iy = s1.get(x);
fout<<x<<endl<<iy<<endl;
iy = s2.get(x);
fout<<x<<endl<<iy<<endl;
}
fin.close();
fout.close();
//free buffer
delete [] line;
delete [] c1;
delete [] c2;
return 0;
}
void BaseOT::Miracl_InitPoint(ECn* point, Big x, Big y)
{
*point = ECn(x, y);
}
void MiraclInitPoint(ECn& point, Big x, Big y)
{
point = ECn(x, y);
}
