93 lines
2.3 KiB
C
93 lines
2.3 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 encrypt.h
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* Header for the internal API of encrypt.c.
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* @brief header for encrypt.c
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*/
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#ifndef PQC_ENCRYPT_H
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#define PQC_ENCRYPT_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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* encrypt the msg, using the math:
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* e = (h ∗ r) + m (mod q)
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*
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* e = the encrypted poly
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*
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* h = the public key
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*
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* r = the random poly
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*
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* m = the message poly
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*
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* q = large mod
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*
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* @param msg_tern the message to encrypt, in ternary format
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* @param pub_key the public key
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* @param rnd the random poly (should have relatively small
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* coefficients, but not restricted to {-1, 0, 1})
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* @param out the output poly which is in the range {0, q-1}
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* (not ternary!) [out]
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* @param ctx ntru_context 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_encrypt_poly(
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const fmpz_poly_t msg_tern,
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const fmpz_poly_t pub_key,
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const fmpz_poly_t rnd,
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fmpz_poly_t out,
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const ntru_context *ctx);
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/**
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* Encrypt a message in the form of a null-terminated char array and
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* return a string.
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*
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* @param msg the message
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* @param pub_key the public key
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* @param rnd the random poly (should have relatively small
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* coefficients, but not restricted to {-1, 0, 1})
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* @param ctx ntru_context the ntru context
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* @return the newly allocated encrypted string, NULL on failure
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*/
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string *
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ntru_encrypt_string(
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const string *msg,
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const fmpz_poly_t pub_key,
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const fmpz_poly_t rnd,
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const ntru_context *ctx);
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#endif /* PQC_ENCRYPT_H */
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