/
Polynomial.cpp
191 lines (171 loc) · 4.07 KB
/
Polynomial.cpp
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#include "Polynomial.h"
Polynomial::Polynomial()
{
p = BN_new();
coefficients = new vector<BIGNUM *>();
}
void Polynomial::SetCoefficients(vector<BIGNUM *> *coefficients)
{
this->coefficients->clear();
vector<BIGNUM *>::iterator iter;
for (iter=coefficients->begin();iter!= coefficients->end();iter++)
{
BIGNUM * bigNum = BN_new();
BN_copy(bigNum,*iter);
this->coefficients->push_back(bigNum);
}
}
Polynomial::Polynomial(const Polynomial &PL)
{
this->p = BN_new();
this->coefficients = new vector<BIGNUM *>();
BN_copy(this->p,PL.p);
vector<BIGNUM *>::iterator iter;
for (iter=PL.coefficients->begin();iter!=PL.coefficients->end();iter++)
{
BIGNUM * bigNum = BN_new();
BN_copy(bigNum,*iter);
this->coefficients->push_back(bigNum);
}
}
Polynomial::Polynomial(vector<BIGNUM *> *coefficients,BIGNUM *p)
{
this->p = BN_new();
this->coefficients = new vector<BIGNUM *>();
BN_copy(this->p,p);
vector<BIGNUM *>::iterator iter;
for (iter=coefficients->begin();iter!=coefficients->end();iter++)
{
BIGNUM * bigNum = BN_new();
BN_copy(bigNum,*iter);
this->coefficients->push_back(bigNum);
}
}
void Polynomial::SetP(BIGNUM *p)
{
BN_copy(this->p,p);
}
Polynomial::Polynomial(BIGNUM *constant,BIGNUM *p,int len)
{
this->p = BN_new();
coefficients = new vector<BIGNUM *>();
BIGNUM *conCopy = BN_new();
BN_copy(this->p,p);
BN_copy(conCopy,constant);
coefficients->push_back(conCopy);
for(int i=1;i<len;i++)
{
BIGNUM * rn = BN_new();
BN_pseudo_rand_range(rn,p);
coefficients->push_back(rn);
}
while(BN_is_zero(*(coefficients->end()-1)))
{
coefficients->pop_back();
BIGNUM * rn = BN_new();
BN_pseudo_rand_range(rn,p);
coefficients->push_back(rn);
}
}
BIGNUM * Polynomial::GetFunctionValue(BIGNUM *x)
{
BN_CTX *ctx = BN_CTX_new();
BIGNUM * value = BN_new() ;
BN_copy(value,*(coefficients->begin()));
BIGNUM * tmp = BN_new();
BIGNUM * tmpx = BN_new();
BN_one(tmpx);
vector<BIGNUM *>::iterator iter;
for (iter=coefficients->begin()+1;iter!= coefficients->end();iter++)
{
BN_mod_mul(tmpx,tmpx,x,p,ctx);
BN_mod_mul(tmp,tmpx,*iter,p,ctx);
BN_mod_add(value,tmp,value,p,ctx);
}
BN_free(tmp);
BN_free(tmpx);
BN_CTX_free(ctx);
return value;
}
BIGNUM * Polynomial::GetLagIntCoe(vector<int> *allParties,int index)
{
BN_CTX *ctx = BN_CTX_new();
BIGNUM *up = BN_new();
BN_one(up);
BIGNUM *down = BN_new();
BN_one(down);
vector<int>::iterator iter;
for (iter=allParties->begin();iter!= allParties->end();iter++)
{
if(*iter == index)
continue;
BIGNUM *j = BN_int2bn(-(*iter));
BIGNUM *i_j = BN_int2bn(index-(*iter));
BN_mul(up,up,j,ctx);
BN_mul(down,down,i_j,ctx);
}
BIGNUM * result = BN_new();
BN_mod_inverse(result,down,p,ctx);
BN_mod_mul(result,result,up,p,ctx);
BN_free(up);
BN_free(down);
BN_CTX_free(ctx);
return result;
}
Polynomial::~Polynomial()
{
BN_free(p);
vector<BIGNUM*>::iterator iter;
for(iter=coefficients->begin();iter!=coefficients->end();iter++)
{
BN_free(*iter);
}
}
Polynomial & Polynomial::operator= (const Polynomial &PL)
{
BN_copy(this->p,PL.p);
this->coefficients->clear();
vector<BIGNUM *>::iterator iter;
for (iter=PL.coefficients->begin();iter!=PL.coefficients->end();iter++)
{
BIGNUM * bigNum = BN_new();
BN_copy(bigNum,*iter);
this->coefficients->push_back(bigNum);
}
}
ostream& operator<<(ostream &os,Polynomial &PL)
{
char *num = NULL;
int count = 0;
bool flag = false;
vector<BIGNUM *>::iterator iter;
for (iter=PL.coefficients->begin();iter!=PL.coefficients->end();iter++)
{
num= BN_bn2dec (*iter);
if(flag)
{
if(strcmp(num,"0"))
{
os<<" + "<<endl;
os<<num<<"."<<"x^"<<count;
}
}
else
{
if(strcmp(num,"0"))
{
flag = true;
os<<num;
if(count)
os<<"x^"<<count;
}
}
count++;
}
if(!flag)
{
os<<"0";
}
os<<endl<<"% "<<BN_bn2dec(PL.p)<<endl;
return os;
}