pqc/include/ntru.h

189 lines
4.2 KiB
C

/*
* Copyright (C) 2014 FH Bielefeld
*
* This file is part of a FH Bielefeld project.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
/**
* @file ntru.h
* This file holds the public API of the most basic
* data types and operations of the pqc NTRU implementation
* and is meant to be installed on the client system.
* @brief public API, basic data types
*/
#ifndef PUBLIC_NTRU_NTRU_H_
#define PUBLIC_NTRU_NTRU_H_
#include <fmpz_poly.h>
#include <fmpz.h>
#include <stdbool.h>
#include <stdint.h>
typedef struct ntru_params ntru_params;
typedef struct string string;
/**
* NTRU cryptosystem is specified by
* the following triple.
*/
struct ntru_params {
/**
* maximal degree N - 1 for
* all polynomials
*/
uint32_t N;
/**
* large modulus
*/
uint32_t q;
/**
* small modulus
*/
uint32_t p;
};
/**
* Represents a string.
*/
struct string {
/**
* Pointer to the char array,
* holding the actual string.
* THIS IS NOT NULL TERMINATED
* (at least not necessarily,
* don't ever assume it).
*/
char *ptr;
/**
* Length of the string.
*/
size_t len;
};
/**
* Prints the given string to stdout.
*
* @param print_string the print to string
*/
void
prints(const string *print_string);
/**
* Delete the inner structure
* of the string and frees the string
* itself from the heap. Must not be
* called on stack variables.
*
* @param del_string the string to delete
*/
void
string_delete(string *del_string);
/**
* Initializes and builds a polynomial with the
* coefficient values of c[] of size len within NTRU
* parameters and returns a newly allocated polynomial.
* For an empty polynom, both c and len can be NULL/0.
*
* @param new_poly the polynomial to initialize and
* fill with coefficients [out]
* @param c array of polynomial coefficients, can be NULL
* @param len size of the coefficient array, can be 0
*/
void
poly_new(fmpz_poly_t new_poly,
int const * const c,
const size_t len);
/**
* This deletes the internal structure of a polynomial,
* and frees the pointer.
*
* @param poly the polynomial to delete
*/
void
poly_delete(fmpz_poly_t poly);
/**
* Delete the internal structure of a polynomial
* array which must be NULL terminated. It is expected
* that poly_array is not on the stack and was obtained
* by a function like ascii_to_poly().
*
* @param poly_array the polynomial array
*/
void
poly_delete_array(fmpz_poly_t **poly_array);
/**
* This deletes the internal structure of all polynomials,
* and frees the pointers.
* You must call this with NULL as last argument!
*
* @param poly the polynomial to delete
* @param ... follow up polynomials
*/
void
poly_delete_all(fmpz_poly_t poly, ...);
/**
* Draws a polynomial to stdout.
*
* @param poly draw this
*/
void
poly_draw(const fmpz_poly_t poly);
/**
* Draws a polynomial to stdout,
* in pretty format.
*
* @param poly draw this
*/
void
poly_draw_pretty(const fmpz_poly_t poly);
/**
* Reads a file and returns a newly allocated string.
*
* @param filename file to open
* @return a newly allocated string which must be freed by the caller
* or NULL on failure
*/
string *
read_file(char const * const filename);
/**
* Write a string to a file. The file will be pruned or created
* if it does not exist.
*
* @param wstring the string to write to the file
* @param filename the name of the file to write to
* @return true for success or false for failure if fopen or fclose failed
*/
bool
write_file(string const *wstring, char const * const filename);
#endif /* NTRU_NTRU_H_ */