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KEYGEN: first implementation

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hasufell 2014-05-24 23:12:15 +02:00
parent d20a448b3b
commit 574bbec067
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2 changed files with 123 additions and 0 deletions
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74
src/keypair.c Normal file
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/*
* 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
*/
#include "context.h"
#include "keypair.h"
#include "poly.h"
#include <fmpz_poly.h>
#include <fmpz.h>
#include <stdbool.h>
bool ntru_create_keypair(
fmpz_poly_t f,
fmpz_poly_t g,
keypair *pair,
ntru_context *ctx)
{
bool retval = true;
fmpz_poly_t Fq,
Fp,
priv;
fmpz_poly_init(Fq);
fmpz_poly_init(Fp);
fmpz_poly_init(priv);
if (!poly_inverse_poly_q(f, Fq, ctx)) {
retval = false;
goto cleanup;
}
if (!poly_inverse_poly_q(f, Fp, ctx)) {
retval = false;
goto cleanup;
}
poly_starmultiply(Fq, g, priv, ctx, ctx->q);
fmpz_poly_scalar_mul_ui(priv, priv, ctx->p);
fmpz_poly_mod(priv, ctx->q);
fmpz_poly_init(pair->priv);
fmpz_poly_init(pair->pub);
fmpz_poly_set(pair->priv, priv);
fmpz_poly_set(pair->pub, Fp);
cleanup:
fmpz_poly_clear(Fq);
fmpz_poly_clear(Fp);
fmpz_poly_clear(priv);
return retval;
}

49
src/keypair.h Normal file
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/*
* 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
*/
#ifndef NTRU_KEYPAIR_H
#define NTRU_KEYPAIR_H
#include "context.h"
#include <fmpz_poly.h>
#include <fmpz.h>
#include <stdbool.h>
typedef struct keypair keypair;
struct keypair {
fmpz_poly_t priv;
fmpz_poly_t pub;
};
bool ntru_create_keypair(
fmpz_poly_t f,
fmpz_poly_t g,
keypair *pair,
ntru_context *ctx);
#endif /* NTRU_KEYPAIR_H */