/** * \file dhm.h * * \brief Diffie-Hellman-Merkle key exchange * * Copyright (C) 2006-2013, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (http://www.polarssl.org) * Lead Maintainer: Paul Bakker * * 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. */ #define POLARSSL_ERR_DHM_INVALID_FORMAT -0x3380 /**< The ASN.1 data is not formatted correctly. */ #define POLARSSL_ERR_DHM_MALLOC_FAILED -0x3400 /**< Allocation of memory failed. */ #define POLARSSL_ERR_DHM_FILE_IO_ERROR -0x3480 /**< Read/write of file failed. */ /** * RFC 2409 defines a number of standardized Diffie-Hellman groups * that can be used. * 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 2409 6.2. 1024-bit MODP Group (Second Oakley Group) * 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_RFC2409_MODP_1024_P \ "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \ "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \ "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \ "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \ "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381" \ "FFFFFFFFFFFFFFFF" #define POLARSSL_DHM_RFC2409_MODP_1024_G "02" #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" #ifdef __cplusplus extern "C" { #endif /** * \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 */ mpi Vi; /*!< blinding value */ mpi Vf; /*!< un-blinding value */ mpi pX; /*!< previous X */ } dhm_context; /** * \brief Initialize DHM context * * \param ctx DHM context to be initialized */ void dhm_init( dhm_context *ctx ); /** * \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 on entry, must hold the size of the destination buffer * on exit, holds the actual number of bytes written * \param f_rng RNG function, for blinding purposes * \param p_rng RNG parameter * * \return 0 if successful, or an POLARSSL_ERR_DHM_XXX error code * * \note If non-NULL, f_rng is used to blind the input as * countermeasure against timing attacks. Blinding is * automatically used if and only if our secret value X is * re-used and costs nothing otherwise, so it is recommended * to always pass a non-NULL f_rng argument. */ int dhm_calc_secret( dhm_context *ctx, unsigned char *output, size_t *olen, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ); /** * \brief Free and clear the components of a DHM key * * \param ctx DHM context to free and clear */ void dhm_free( dhm_context *ctx ); #if defined(POLARSSL_ASN1_PARSE_C) /** \ingroup x509_module */ /** * \brief Parse DHM parameters * * \param dhm DHM context to be initialized * \param dhmin input buffer * \param dhminlen size of the buffer * * \return 0 if successful, or a specific DHM or PEM error code */ int dhm_parse_dhm( dhm_context *dhm, const unsigned char *dhmin, size_t dhminlen ); #if defined(POLARSSL_FS_IO) /** \ingroup x509_module */ /** * \brief Load and parse DHM parameters * * \param dhm DHM context to be initialized * \param path filename to read the DHM Parameters from * * \return 0 if successful, or a specific DHM or PEM error code */ int dhm_parse_dhmfile( dhm_context *dhm, const char *path ); #endif /* POLARSSL_FS_IO */ #endif /* POLARSSL_ASN1_PARSE_C */ /** * \brief Checkup routine * * \return 0 if successful, or 1 if the test failed */ int dhm_self_test( int verbose ); #ifdef __cplusplus } #endif #endif /* dhm.h */