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Merge branch 'master' of ssh://gitlab.hasufell.de:22022/cgawlik/quantumcrypto

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hasufell 2014-05-19 21:30:13 +02:00
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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 "pcq_encrypt.h"
/*
* encrypt the msg, using the math:
* e = (h ∗ r) + m (mod q)
*
* e = the encrypted poly
* h = the public key
* r = the random poly
* m = the message poly
* q = large mod
*
* @param ctx ntru_context* the ntru context
* @param rnd pb_poly* the random poly
* @param msg pb_poly* the message to encrypt
* @param pubKey pb_poly* the public key
* @param out pb_poly* the output poly
*/
void pb_encrypt(ntru_context *ctx,
pb_poly *rnd,
pb_poly *msg,
pb_poly *pubKey,
pb_poly *out)
{
mp_int *tmpOut;
mp_int *tmpMsg;
mp_int mp_mod;
init_integer(&mp_mod);
MP_SET_INT(&mp_mod,(unsigned long)ctx->q);
pb_starmultiply(pubKey, rnd, out, ctx, ctx->q);
tmpOut = out->terms;
tmpMsg = msg->terms;
for(unsigned int i = 0; i <= ctx->N-1; i++) {
mp_add(tmpOut,tmpMsg,tmpOut);
mp_mod(tmpOut,mp_mod,tmpOut);
tmpOut++;
tmpMsg++;
}
}

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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 PQC_ENCRYPT_H
#define PQC_ENCRYPT_H
#include <tommath.h>
#include <tompoly.h>
#include "context.h"
#include "poly.h"
void pb_encrypt(ntru_context *ctx,
pb_poly *rnd,
pb_poly *msg,
pb_poly *pubKey,
pb_poly *out);
#endif /* PQC_ENCRYPT_H */