# infidel_poly

C polynomial library for ECC based cryptography. 

## References
- **Libntru** : Polynomial multiplication and inversion [commit](https://github.com/tbuktu/libntru/commit/15423e7f5f44d5ef69cb4aa50eaa03c07a7ecad0)
- **Sanfoundry** : [C Program to Evaluate given polynomial equation](https://www.sanfoundry.com/c-program-polynomial-equation/)

## Libntru Notes

Libntru use some custom data types declared in `types.h`. 

`NtruIntPoly` : Polynomial with 16-bit integer coefficients

```c
    typedef struct NtruIntPoly {
        uint16_t N;
        int16_t coeffs[NTRU_INT_POLY_SIZE];
    } NtruIntPoly;
```

`NtruTernPoly` : Ternary polynomial, all coefficients are equal to -1, 0, or 1.
```c
    typedef struct NtruTernPoly {
        uint16_t N;
        uint16_t num_ones;
        uint16_t num_neg_ones;
        uint16_t ones[NTRU_MAX_ONES];
        uint16_t neg_ones[NTRU_MAX_ONES];
    } NtruTernPoly;
```



## Key Components
- [ ] Basic Evaluation on generated equation
- [ ] Basic Operation (Addition, Reduction, Multiplication, Division)
- [ ] Advance Operation (Inversion)
- [ ] Bitwise for array 
- [ ] Pointer management for polynomial indexes
- [ ] Random Generators