#include<stdio.h>
#include<obliv.oh>

#include"hamming.h"

//Refactor: put this somewhere useful
void readString(obliv char* dest, int n, const char* src,int party)
{
  OblivInputs specs[MAXN];
  int i;
  for(i=0;i<n;++i) setupOblivChar(specs+i,dest+i,src[i]);
  feedOblivInputs(specs,n,party);
}

void hammingDistance(void* args)
{
  protocolIO *io = args;
  int n1,n2,n;
  int i,j;
  obliv char s1[MAXN], s2[MAXN];
  obliv int res=0;

  n1 = ocBroadcastInt(io->n,1);
  n2 = ocBroadcastInt(io->n,2);

  readString(s1,n1,io->s,1);
  readString(s2,n2,io->s,2);

  n = (n1<n2?n1:n2);
  for(i=0;i<n;++i) res+=(s1[i]!=s2[i]);
  revealOblivInt(&io->res,res,0);
  io->res+=(n1+n2-n*2);
}