64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* Copyright (c) 1999, 2000, 2001, 2002 Virtual Unlimited B.V.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*!\file dlsvdp-dh.c
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* \brief Diffie-Hellman algorithm.
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*
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* The IEEE P.1363 designation is:
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* Discrete Logarithm Secret Value Derivation Primitive, Diffie-Hellman style.
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*
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* \author Bob Deblier <bob.deblier@pandora.be>
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* \ingroup DL_m DL_dh_m
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*/
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#include "system.h"
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#include "dlsvdp-dh.h"
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#include "debug.h"
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/*!\addtogroup DL_dh_m
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* \{
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*/
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/*!\fn dlsvdp_pDHSecret(const dhparam* dp, const mpnumber* x, const mpnumber* y, mpnumber* s)
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* \brief Computes the shared secret.
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*
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* Equation:
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*
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* \li \f$s=y^{x}\ \textrm{mod}\ p\f$
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*
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* \param dp The domain parameters.
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* \param x The private value.
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* \param y The public value (of the peer).
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* \param s The computed secret value.
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*
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* \retval 0 on success.
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* \retval -1 on failure.
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*/
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int dlsvdp_pDHSecret(const dhparam* dp, const mpnumber* x, const mpnumber* y, mpnumber* s)
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{
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mpbnpowmod(&dp->p, y, x, s);
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return 0;
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}
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/*!\}
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*/
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