/**
* \file dhm.h
*
* \brief Diffie-Hellman-Merkle key exchange
*
* Copyright (C) 2006-2010, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_DHM_H
#define POLARSSL_DHM_H
#include "bignum.h"
/*
* DHM Error codes
*/
#define POLARSSL_ERR_DHM_BAD_INPUT_DATA -0x3080 /**< Bad input parameters to function. */
#define POLARSSL_ERR_DHM_READ_PARAMS_FAILED -0x3100 /**< Reading of the DHM parameters failed. */
#define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED -0x3180 /**< Making of the DHM parameters failed. */
#define POLARSSL_ERR_DHM_READ_PUBLIC_FAILED -0x3200 /**< Reading of the public values failed. */
#define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED -0x3280 /**< Making of the public value failed. */
#define POLARSSL_ERR_DHM_CALC_SECRET_FAILED -0x3300 /**< Calculation of the DHM secret failed. */
/**
* RFC 3526 defines a number of standardized Diffie-Hellman groups
* for IKE.
* RFC 5114 defines a number of standardized Diffie-Hellman groups
* that can be used.
*
* Some are included here for convenience.
*
* Included are:
* RFC 3526 3. 2048-bit MODP Group
* RFC 3526 4. 3072-bit MODP Group
* RFC 5114 2.1. 1024-bit MODP Group with 160-bit Prime Order Subgroup
* RFC 5114 2.2. 2048-bit MODP Group with 224-bit Prime Order Subgroup
*/
#define POLARSSL_DHM_RFC3526_MODP_2048_P \
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
"DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
"15728E5A8AACAA68FFFFFFFFFFFFFFFF"
#define POLARSSL_DHM_RFC3526_MODP_2048_G "02"
#define POLARSSL_DHM_RFC3526_MODP_3072_P \
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
"DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
"15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64" \
"ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7" \
"ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B" \
"F12FFA06D98A0864D87602733EC86A64521F2B18177B200C" \
"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31" \
"43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF"
#define POLARSSL_DHM_RFC3526_MODP_3072_G "02"
#define POLARSSL_DHM_RFC5114_MODP_1024_P \
"B10B8F96A080E01DDE92DE5EAE5D54EC52C99FBCFB06A3C6" \
"9A6A9DCA52D23B616073E28675A23D189838EF1E2EE652C0" \
"13ECB4AEA906112324975C3CD49B83BFACCBDD7D90C4BD70" \
"98488E9C219A73724EFFD6FAE5644738FAA31A4FF55BCCC0" \
"A151AF5F0DC8B4BD45BF37DF365C1A65E68CFDA76D4DA708" \
"DF1FB2BC2E4A4371"
#define POLARSSL_DHM_RFC5114_MODP_1024_G \
"A4D1CBD5C3FD34126765A442EFB99905F8104DD258AC507F" \
"D6406CFF14266D31266FEA1E5C41564B777E690F5504F213" \
"160217B4B01B886A5E91547F9E2749F4D7FBD7D3B9A92EE1" \
"909D0D2263F80A76A6A24C087A091F531DBF0A0169B6A28A" \
"D662A4D18E73AFA32D779D5918D08BC8858F4DCEF97C2A24" \
"855E6EEB22B3B2E5"
#define POLARSSL_DHM_RFC5114_MODP_2048_P \
"AD107E1E9123A9D0D660FAA79559C51FA20D64E5683B9FD1" \
"B54B1597B61D0A75E6FA141DF95A56DBAF9A3C407BA1DF15" \
"EB3D688A309C180E1DE6B85A1274A0A66D3F8152AD6AC212" \
"9037C9EDEFDA4DF8D91E8FEF55B7394B7AD5B7D0B6C12207" \
"C9F98D11ED34DBF6C6BA0B2C8BBC27BE6A00E0A0B9C49708" \
"B3BF8A317091883681286130BC8985DB1602E714415D9330" \
"278273C7DE31EFDC7310F7121FD5A07415987D9ADC0A486D" \
"CDF93ACC44328387315D75E198C641A480CD86A1B9E587E8" \
"BE60E69CC928B2B9C52172E413042E9B23F10B0E16E79763" \
"C9B53DCF4BA80A29E3FB73C16B8E75B97EF363E2FFA31F71" \
"CF9DE5384E71B81C0AC4DFFE0C10E64F"
#define POLARSSL_DHM_RFC5114_MODP_2048_G \
"AC4032EF4F2D9AE39DF30B5C8FFDAC506CDEBE7B89998CAF"\
"74866A08CFE4FFE3A6824A4E10B9A6F0DD921F01A70C4AFA"\
"AB739D7700C29F52C57DB17C620A8652BE5E9001A8D66AD7"\
"C17669101999024AF4D027275AC1348BB8A762D0521BC98A"\
"E247150422EA1ED409939D54DA7460CDB5F6C6B250717CBE"\
"F180EB34118E98D119529A45D6F834566E3025E316A330EF"\
"BB77A86F0C1AB15B051AE3D428C8F8ACB70A8137150B8EEB"\
"10E183EDD19963DDD9E263E4770589EF6AA21E7F5F2FF381"\
"B539CCE3409D13CD566AFBB48D6C019181E1BCFE94B30269"\
"EDFE72FE9B6AA4BD7B5A0F1C71CFFF4C19C418E1F6EC0179"\
"81BC087F2A7065B384B890D3191F2BFA"
/**
* \brief DHM context structure
*/
typedef struct
{
size_t len; /*!< size(P) in chars */
mpi P; /*!< prime modulus */
mpi G; /*!< generator */
mpi X; /*!< secret value */
mpi GX; /*!< self = G^X mod P */
mpi GY; /*!< peer = G^Y mod P */
mpi K; /*!< key = GY^X mod P */
mpi RP; /*!< cached R^2 mod P */
}
dhm_context;
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Parse the ServerKeyExchange parameters
*
* \param ctx DHM context
* \param p &(start of input buffer)
* \param end end of buffer
*
* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
*/
int dhm_read_params( dhm_context *ctx,
unsigned char **p,
const unsigned char *end );
/**
* \brief Setup and write the ServerKeyExchange parameters
*
* \param ctx DHM context
* \param x_size private value size in bytes
* \param output destination buffer
* \param olen number of chars written
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \note This function assumes that ctx->P and ctx->G
* have already been properly set (for example
* using mpi_read_string or mpi_read_binary).
*
* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
*/
int dhm_make_params( dhm_context *ctx, int x_size,
unsigned char *output, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Import the peer's public value G^Y
*
* \param ctx DHM context
* \param input input buffer
* \param ilen size of buffer
*
* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
*/
int dhm_read_public( dhm_context *ctx,
const unsigned char *input, size_t ilen );
/**
* \brief Create own private value X and export G^X
*
* \param ctx DHM context
* \param x_size private value size in bytes
* \param output destination buffer
* \param olen must be equal to ctx->P.len
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
*/
int dhm_make_public( dhm_context *ctx, int x_size,
unsigned char *output, size_t olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Derive and export the shared secret (G^Y)^X mod P
*
* \param ctx DHM context
* \param output destination buffer
* \param olen number of chars written
*
* \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code
*/
int dhm_calc_secret( dhm_context *ctx,
unsigned char *output, size_t *olen );
/**
* \brief Free the components of a DHM key
*/
void dhm_free( dhm_context *ctx );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int dhm_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif