81 рядки
2.2 KiB
C
81 рядки
2.2 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 decrypt.h
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* Header for the external API of decrypt.c.
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* @brief header for decrypt.c
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*/
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#ifndef NTRU_DECRYPT_H
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#define NTRU_DECRYPT_H
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#include "context.h"
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#include "ntru_string.h"
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#include "poly.h"
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#include <stdbool.h>
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#include <fmpz_poly.h>
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#include <fmpz.h>
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/**
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* Decryption of the given Polynom with the private key, its inverse
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* and the fitting ntru_context
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*
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* @param encr_msg encrypted polynom with maximum length of N from
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* the given context
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* @param priv_key the polynom containing the private key to decrypt
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* the message
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* @param priv_key_inv the inverse polynome to the private key
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* @param out_tern the resulting ternary polynom [out]
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* @param ctx the ntru_context
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* @return true/false for success/failure
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*/
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bool
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ntru_decrypt_poly(
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const fmpz_poly_t encr_msg,
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const fmpz_poly_t priv_key,
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const fmpz_poly_t priv_key_inv,
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fmpz_poly_t out_tern,
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const ntru_context *ctx);
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/**
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* Decryption of a given encrypted string.
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*
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* @param encr_msg the encrypted message in the form of a string
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* @param priv_key the polynom containing the private key to decrypt
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* the message
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* @param priv_key_inv the inverse polynome to the private key
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* @param ctx the ntru_context
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* @return the decrypted string or NULL on failure
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*/
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string *
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ntru_decrypt_string(
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const string *encr_msg,
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const fmpz_poly_t priv_key,
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const fmpz_poly_t priv_key_inv,
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const ntru_context *ctx);
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#endif /* NTRU_DECRYPT */
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