140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/**
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* \file dhm.h
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_DHM_H
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#define POLARSSL_DHM_H
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#include "polarssl/bignum.h"
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#define POLARSSL_ERR_DHM_BAD_INPUT_DATA -0x0480
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#define POLARSSL_ERR_DHM_READ_PARAMS_FAILED -0x0490
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#define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED -0x04A0
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#define POLARSSL_ERR_DHM_READ_PUBLIC_FAILED -0x04B0
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#define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED -0x04C0
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#define POLARSSL_ERR_DHM_CALC_SECRET_FAILED -0x04D0
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typedef struct
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{
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int len; /*!< size(P) in chars */
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mpi P; /*!< prime modulus */
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mpi G; /*!< generator */
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mpi X; /*!< secret value */
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mpi GX; /*!< self = G^X mod P */
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mpi GY; /*!< peer = G^Y mod P */
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mpi K; /*!< key = GY^X mod P */
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mpi RP; /*!< cached R^2 mod P */
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}
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dhm_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Parse the ServerKeyExchange parameters
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*
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* \param ctx DHM context
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* \param p &(start of input buffer)
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* \param end end of buffer
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*
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* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
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*/
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int dhm_read_params( dhm_context *ctx,
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unsigned char **p,
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unsigned char *end );
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/**
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* \brief Setup and write the ServerKeyExchange parameters
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*
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* \param ctx DHM context
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* \param x_size private value size in bits
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* \param output destination buffer
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* \param olen number of chars written
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \note This function assumes that ctx->P and ctx->G
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* have already been properly set (for example
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* using mpi_read_string or mpi_read_binary).
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*
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* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
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*/
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int dhm_make_params( dhm_context *ctx, int s_size,
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unsigned char *output, int *olen,
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int (*f_rng)(void *), void *p_rng );
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/**
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* \brief Import the peer's public value G^Y
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*
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* \param ctx DHM context
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* \param input input buffer
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* \param ilen size of buffer
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*
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* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
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*/
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int dhm_read_public( dhm_context *ctx,
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unsigned char *input, int ilen );
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/**
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* \brief Create own private value X and export G^X
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*
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* \param ctx DHM context
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* \param x_size private value size in bits
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* \param output destination buffer
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* \param olen must be equal to ctx->P.len
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
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*/
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int dhm_make_public( dhm_context *ctx, int s_size,
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unsigned char *output, int olen,
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int (*f_rng)(void *), void *p_rng );
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/**
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* \brief Derive and export the shared secret (G^Y)^X mod P
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*
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* \param ctx DHM context
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* \param output destination buffer
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* \param olen number of chars written
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*
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* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
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*/
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int dhm_calc_secret( dhm_context *ctx,
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unsigned char *output, int *olen );
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/*
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* \brief Free the components of a DHM key
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*/
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void dhm_free( dhm_context *ctx );
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int dhm_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif
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