#ifndef H_ARITH
#define H_ARITH

#include <stdint.h>

// Field element (invariant: val <= MOD)
typedef struct {
  uint64_t val;
} fp;

// An authenticated share: consists of linear shares of (x, Delta * x)
struct share {
  fp *s;
  fp *s_mac;
};

// Generate a fully random field element
fp *rand_fp();

// Convert a uint to a Fp
fp *from(uint64_t v);

// Add two field elements together
fp *add(fp *a, fp *b);

// Multiply two field elements together
fp *mul(fp *a, fp *b);

// Negate a field element (-x)
fp *neg(fp *a);

// Check if a field element is zero.
int is_zero(fp *x);

// Produce a printable uint64 from the field element.
uint64_t get_output(fp *o);

#endif