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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
/**
* @file field.h
*/
#ifndef ECGEN_FIELD_H
#define ECGEN_FIELD_H
#include "misc/types.h"
/**
* GENERATOR(gen_f)
* Creates a random field.
* Always succeeds.
*
* @param curve A curve_t being generated
* @param cfg An application config
* @param args unused
* @return state diff
*/
GENERATOR(field_gen_random);
/**
* GENERATOR(gen_f)
* Creates a field by reading:
* - a prime number in the prime field case
* - three short exponents of the reduction polynomial in the binary case
*
* @param curve A curve_t being generated
* @param cfg An application config
* @param args unused
* @return state diff
*/
GENERATOR(field_gen_input);
/**
* GENERATOR(gen_f)
* Creates the field by reading it once.
*
* @param curve A curve_t being generated
* @param cfg An application config
* @param args unused
* @return state diff
*/
GENERATOR(field_gen_once);
/**
* Extract a field representation from a field.
* - char(field) == 2:
* returns the vector of powers of middle coefficients of the reduction
* polynomial.
* - char(field) != 2:
* returns the vector of the field characteristic(p).
*
* @param field
* @return field representation
*/
GEN field_params(GEN field);
/**
* Transforms a field element to an integer.
* Uses the polynomial basis of the underlying field in case of a binary field.
*
* @param element t_INTMOD, t_INT, t_FFELT to transform
* @return t_INT
*/
GEN field_elementi(GEN element);
/**
* Transforms an integer into a field element.
*
* @param field the field to work in
* @param in the integer to transform
* @return a field element, t_INTMOD or t_FFELT
*/
GEN field_ielement(GEN field, GEN in);
#endif // ECGEN_FIELD_H
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