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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017-2018 J08nY
*/
/**
* @file types.h
*/
#ifndef ECGEN_MISC_TYPES_H
#define ECGEN_MISC_TYPES_H
#include <limits.h>
#include <pari/pari.h>
#include "config.h"
/**
* @brief
* @param bits
* @param bitlen
* @param allocated
*/
typedef struct {
unsigned char *bits;
size_t bitlen;
size_t allocated;
} bits_t;
/**
* @brief
* @param seed
* @param hash20
* @param type
* @param ansi
* @param brainpool
*/
typedef struct {
bits_t *seed;
unsigned char *hash20;
seed_e type;
union {
struct {
GEN t;
GEN s;
GEN h;
GEN r;
} ansi;
struct {
bool update_seed;
long w;
long v;
bits_t *seed_a;
bits_t *seed_b;
GEN mult;
} brainpool;
};
} seed_t;
/**
* @brief A point type.
* @param point a t_VEC with t_INTMOD or t_FFELT components [x,y]
* @param order a t_INT
* @param cofactor a t_INT
*/
typedef struct {
GEN point;
GEN order;
GEN cofactor;
} point_t;
/**
* @brief A subgroup type.
* @param generator a point generating the subgroup
* @param npoints number of points stored in the subgroup
* @param points the stored points
*/
typedef struct {
point_t *generator;
size_t npoints;
point_t **points;
} subgroup_t;
/**
* @brief Curve metadata.
*/
typedef struct {
GEN j_invariant;
GEN discriminant;
GEN cm_discriminant;
GEN frobenius_trace;
GEN embedding_degree;
} metadata_t;
/**
* @brief A curve type.
* @param seed a seed_t
* @param field a t_INT or t_FFELT
* @param a a t_INTMOD or t_FFELT a parameter
* @param b a t_INTMOD or t_FFELT b parameter
* @param curve a t_ELL, curve object
* @param order a t_INT, curve order
* @param generators generators saved
* @param meta
* @param ngens number of generators saved in the curve type
*/
typedef struct {
seed_t *seed;
GEN field;
GEN a;
GEN b;
GEN curve;
GEN order;
subgroup_t **generators;
size_t ngens;
metadata_t meta;
} curve_t;
/**
* @brief
*/
typedef enum {
OFFSET_SEED = 0,
OFFSET_FIELD,
OFFSET_A,
OFFSET_B,
OFFSET_CURVE,
OFFSET_ORDER,
OFFSET_GENERATORS,
OFFSET_POINTS,
OFFSET_METADATA,
OFFSET_END
} offset_e;
extern const char *offset_s[OFFSET_END];
/**
* @brief
*/
typedef struct {
const void *args;
size_t nargs;
void *allocd;
} arg_t;
/**
* @brief A generator function type.
* @param curve A curve_t being generated
* @param args Current optional generator argument
* @param state The current generation state
* @return state diff
*/
#define GENERATOR(gen_name) \
int gen_name(curve_t *curve, arg_t *args, offset_e state)
typedef GENERATOR((*gen_f));
/**
* @brief An unroll function type
* @param curve
* @param from
* @param to
* @return
*/
#define UNROLL(unroll_name) \
int unroll_name(curve_t *curve, pari_sp from, pari_sp to)
typedef UNROLL((*unroll_f));
/**
* @brief A check function type.
* @param curve A curve_t being checked
* @param args Current optional generator argument
* @return state diff
*/
#define CHECK(check_name) GENERATOR(check_name)
typedef CHECK((*check_f));
/**
* @brief
*/
typedef struct {
check_f *checks;
size_t nchecks;
} check_t;
/**
* GENERATOR(gen_f)
*
* @param curve A curve_t being generated
* @param args unused
* @return state diff
*/
GENERATOR(gen_skip);
/**
* CHECK(check_f)
*
* @param curve A curve_t being checked
* @param args unused
* @return
*/
CHECK(check_skip);
/**
* UNROLL(unroll_f)
*
* @param curve
* @param from
* @param to
* @return
*/
UNROLL(unroll_skip);
#endif // ECGEN_MISC_TYPES_H
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