138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* Copyright (C) 2014 FH Bielefeld
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*
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* This file is part of a FH Bielefeld project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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/**
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* @file poly_ascii.h
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* Header for the internal API of poly_ascii.c.
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* @brief header for poly_ascii.c
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*/
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#ifndef NTRU_POLY_ASCII_H_
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#define NTRU_POLY_ASCII_H_
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#include "common.h"
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#include "context.h"
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#include "ntru_string.h"
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#include <fmpz_poly.h>
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#include <fmpz.h>
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/**
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* Convert a single binary polynomial back to a real string.
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* The polynomial coefficients represent a binary format of the
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* ascii string with the following mapping:
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*
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* 1 => 1
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*
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* -1 => 0
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*
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* 2 => 0
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*
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* The 2's are only used for filling up the rest of the polynomial,
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* so they will just end up as '\0's at the end of the string and will
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* not confuse the result.
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*
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* @param poly the binary polynomial to convert
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* @param ctx the NTRUEncrypt context
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* @return the real string, newly allocated
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*/
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string *
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bin_poly_to_ascii(const fmpz_poly_t poly,
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const ntru_context *ctx);
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/**
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* Convert an array of binary polynomials back to a real string.
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* The polynomial coefficients represent a binary format of the
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* ascii string with the following mapping:
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*
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* 1 => 1
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*
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* -1 => 0
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*
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* 2 => 0
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*
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* The 2's are only used for filling up the last polynomial, so they will
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* just end up as '\0's at the end of the string and will not confuse
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* the result.
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*
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* @param bin_poly_arr the array of polynomials
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* @param ctx the NTRUEncrypt context
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* @return the real string, newly allocated
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*/
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string *
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bin_poly_arr_to_ascii(fmpz_poly_t **bin_poly_arr,
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const ntru_context *ctx);
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/**
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* Convert a single polynom back to a real string which is
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* ascii encoded (full 256 C char spectrum).
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* The polynomial coefficients are expected to be in the range
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* [0, q-1] and will be casted back to chars without any mapping.
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*
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* Trailing q coefficients are only used for filling up the rest of
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* a polynomial with '\0', so they will not confuse the result.
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*
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* @param poly the polynomial to convert
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* @param ctx the NTRUEncrypt context
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* @return the real string, newly allocated
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*/
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string *
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poly_to_ascii(const fmpz_poly_t poly,
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const ntru_context *ctx);
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/**
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* Convert a single polynom back to a real string which is
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* base64 encoded.
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* The polynomial coefficients are expected to be in the range
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* [0, q-1] and will be casted back to chars without any mapping.
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*
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* Trailing q coefficients are only used for filling up the rest of
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* a polynomial with '\0', so they will not confuse the result.
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*
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* @param poly the polynomial to convert
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* @param ctx the NTRUEncrypt context
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* @return the real string, newly allocated
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*/
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string *
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poly_to_base64(const fmpz_poly_t poly,
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const ntru_context *ctx);
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/**
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* Convert an array of polynomials back to a real string which
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* is base64 encoded.
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* The polynomial coefficients are expected to be in the range
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* [0, q-1] and will be casted back to chars without any mapping.
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*
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* Trailing q coefficients are only used for filling up the rest of
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* a polynomial with '\0', so they will not confuse the result.
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*
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* @param poly_arr the array of polynomials
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* @param ctx the NTRUEncrypt context
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* @return the real string, newly allocated
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*/
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string *
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poly_arr_to_base64(fmpz_poly_t **poly_arr, const ntru_context *ctx);
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#endif /* NTRU_POLY_ASCII_H_ */
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