char* integer_to_string(integer x) {
int i, result_len;
char* result =
(char*)malloc((int)ceil(COMPONENT_BITS*x.num_components/LOG_2_10) + 2);
integer ten = create_integer(1);
ten.c[0] = 10;
if (is_zero_integer(x)) {
strcpy(result, "0");
} else {
for (i = 0; !is_zero_integer(x); i++) {
result[i] = (char)mod_small_integer(x, 10) + '0';
divide_small_integer(x, 10, x);
}
result[i] = '\0';
}
result_len = strlen(result);
for(i=0; i < result_len/2; i++) {
char temp = result[i];
result[i] = result[result_len - i - 1];
result[result_len - i - 1] = temp;
}
free_integer(ten);
return result;
}
unsigned int integer_to_binary(unsigned char** result,integer data,int keyLenBytes){
integer base=string_to_integer("256");
integer div=create_integer(data.num_components);
copy_integer(data,div);
integer zero=create_integer(1);
zero.c[0]=0;
unsigned char* pf=new unsigned char[data.num_components];
for(int i=0; i<data.num_components; i++){
pf[i]=0;
}
int tpos=data.num_components-1;
pf[tpos]=div.c[0];
tpos--;
while(compare_integers(div,zero)==1){
integer mod=create_integer(div.num_components+1+1);
mod_integer(div,base,mod);
integer div_temp=create_integer(div.num_components);
copy_integer(div,div_temp);
divide_small_integer(div_temp,256,div);
pf[tpos]=div.c[0];
tpos--;
}
int startpos=div.num_components-keyLenBytes;
*result=new unsigned char[keyLenBytes];
for(int i=0; i<keyLenBytes; i++){
(*result)[i]=pf[i+startpos];
}
return keyLenBytes;
}
int pow_mod(unsigned char** result,unsigned char* p,unsigned char* q, unsigned char* r,unsigned int keyLengthBytes){
std::set_new_handler(newh);
Array<integer> factors;
integer div=hex_to_integer(q,keyLengthBytes,0);
int siz=keyLengthBytes;
integer power_of_two=create_integer(siz);
set_zero_integer(power_of_two);
integer zero=create_integer(1);
set_zero_integer(zero);
integer two=string_to_integer("2");
integer one=string_to_integer("1");
int i=0;
integer div_temp=create_integer(div.num_components);
integer rem=create_integer(div.num_components+2);
while(compare_integers(div, zero) == 1){
set_zero_integer(rem);
mod_integer(div, two,rem);
copy_integer(div,div_temp);
divide_small_integer(div_temp,2,div);
if(compare_integers(rem, zero) == 1){
integer ptt=create_integer(power_of_two.num_components);
copy_integer(power_of_two,ptt);
factors.pushBack(ptt);
}
add_integer(power_of_two,one,power_of_two);
i++;
}
free_integer(rem);
free_integer(div_temp);
Array<integer> partial_results;
integer part_res=hex_to_integer(p,keyLengthBytes,2);
integer ri=hex_to_integer(r,keyLengthBytes,1);
integer idx = create_integer(part_res.num_components);
set_zero_integer(idx);
integer part_res_temp1=create_integer(part_res.num_components);
integer part_res_temp2=create_integer(part_res.num_components);
integer part_res_temp3=create_integer(part_res.num_components);
for(int i=0; i<factors.size(); i++){
while(compare_integers(factors[i],idx)==1){
copy_integer(part_res,part_res_temp1);
copy_integer(part_res,part_res_temp2);
multiply_integer(part_res_temp1,part_res_temp2,part_res);
copy_integer(part_res,part_res_temp3);
mod_integer(part_res_temp3,ri,part_res);
add_integer(idx,one,idx);
}
integer ptt=create_integer(part_res.num_components);
copy_integer(part_res,ptt);
partial_results.pushBack(ptt);
}
free_integer(part_res_temp1);
free_integer(part_res_temp2);
free_integer(part_res_temp3);
integer resulti=create_integer(ri.num_components+1);
set_zero_integer(resulti);
resulti.c[0]=1;
integer resulti_temp=create_integer(resulti.num_components);
integer resulti_temp2=create_integer(resulti.num_components);
for(int i=0; i<partial_results.size(); i++){
copy_integer(resulti,resulti_temp);
multiply_integer(resulti_temp,partial_results[i],resulti);
copy_integer(resulti,resulti_temp2);
mod_integer(resulti_temp2,ri,resulti);
}
free_integer(resulti_temp);
free_integer(resulti_temp2);
int lol=integer_to_binary(result,resulti,keyLengthBytes);
return lol;
}
