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- wrote diffie_hellman_t but not tested

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Jan Hutter
2005-11-18 08:19:12 +00:00
parent d768cb6790
commit 99400f979e
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Source/charon/transforms/diffie_hellman.c
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/**
* @file diffie_hellman.c
*
* @brief Class to represent a diffie hellman exchange.
*
*/
/*
* Copyright (C) 1998-2002 D. Hugh Redelmeier.
* Copyright (C) 1999, 2000, 2001 Henry Spencer.
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <gmp.h>
#include "diffie_hellman.h"
#include "../payloads/transform_substructure.h"
#include "../utils/allocator.h"
#include "../utils/randomizer.h"
#include "../utils/gmp_helper.h"
/**
* Modulus of Group 1
*/
static u_int8_t group1_modulus[] = {
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,0x21,0x68,0xC2,0x34,
0xC4,0xC6,0x62,0x8B,0x80 ,0xDC,0x1C,0xD1,0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,
0x02,0x0B,0xBE,0xA6,0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,0xF2,0x5F,0x14,0x37,
0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,
0xF4,0x4C,0x42,0xE9,0xA6,0x3A,0x36,0x20,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};
/**
* Entry of the modulus list
*/
typedef struct modulus_info_entry_s modulus_info_entry_t;
struct modulus_info_entry_s{
/**
* Group number as it is defined in transform_substructure.h
*/
diffie_hellman_group_t group;
/**
* Pointer to first byte of modulus in (network order)
*/
u_int8_t *modulus;
/*
* Length of modulus in bytes
*/
size_t modulus_length;
/*
* Generator value
*/
u_int16_t generator;
};
static modulus_info_entry_t modulus_info_entries[] = {
{MODP_768_BIT,group1_modulus,sizeof(group1_modulus),2},
};
/**
* Private data of an diffie_hellman_t object.
*
*/
typedef struct private_diffie_hellman_s private_diffie_hellman_t;
struct private_diffie_hellman_s {
/**
* public diffie_hellman_t interface
*/
diffie_hellman_t public;
/**
* Diffie Hellman group number
*/
u_int16_t dh_group_number;
/**
* Modulus
*/
mpz_t modulus;
/**
* Modulus length
*/
size_t modulus_length;
/*
* Generator value
*/
u_int16_t generator;
/**
* My prime
*/
mpz_t my_prime;
/**
* My public value
*/
mpz_t my_public_value;
/**
* Other public value
*/
mpz_t other_public_value;
/**
* Shared secret
*/
mpz_t shared_secret;
/**
* True if public modulus is computed and stored in my_public_value
*/
bool my_public_value_is_computed;
/**
* True if shared secret is computed and stored in my_public_value
*/
bool shared_secret_is_computed;
/**
* helper class for gmp functions
*/
gmp_helper_t *gmp_helper;
/**
* Sets the modulus for a specific diffie hellman group
*
* @param this calling object
* @return
* SUCCESS if modulus could be found
* NOT_FOUND if modulus not supported
*/
status_t (*set_modulus) (private_diffie_hellman_t *this);
/**
* Makes sure my public value is computed
*
* @param this calling object
*/
void (*compute_public_value) (private_diffie_hellman_t *this);
/**
* Computes shared secret (other public value must be available)
*
* @param this calling object
*/
void (*compute_shared_secret) (private_diffie_hellman_t *this);
};
/* Compute DH shared secret from our local secret and the peer's public value.
* We make the leap that the length should be that of the group
* (see quoted passage at start of ACCEPT_KE).
*/
//static void
//compute_dh_shared(struct state *st, const chunk_t g
//, const struct oakley_group_desc *group)
//{
// MP_INT mp_g, mp_shared;
// struct timeval tv0, tv1;
// unsigned long tv_diff;
//
// gettimeofday(&tv0, NULL);
// passert(st->st_sec_in_use);
// n_to_mpz(&mp_g, g.ptr, g.len);
// mpz_init(&mp_shared);
// mpz_powm(&mp_shared, &mp_g, &st->st_sec, group->modulus);
// mpz_clear(&mp_g);
// freeanychunk(st->st_shared); /* happens in odd error cases */
// st->st_shared = mpz_to_n(&mp_shared, group->bytes);
// mpz_clear(&mp_shared);
// gettimeofday(&tv1, NULL);
// tv_diff=(tv1.tv_sec - tv0.tv_sec) * 1000000 + (tv1.tv_usec - tv0.tv_usec);
// DBG(DBG_CRYPT,
// DBG_log("compute_dh_shared(): time elapsed (%s): %ld usec"
// , enum_show(&oakley_group_names, st->st_oakley.group->group)
// , tv_diff);
// );
// /* if took more than 200 msec ... */
// if (tv_diff > 200000) {
// loglog(RC_LOG_SERIOUS, "WARNING: compute_dh_shared(): for %s took "
// "%ld usec"
// , enum_show(&oakley_group_names, st->st_oakley.group->group)
// , tv_diff);
// }
//
// DBG_cond_dump_chunk(DBG_CRYPT, "DH shared secret:\n", st->st_shared);
//}
/**
* Implements private_diffie_hellman_t's set_modulus function.
* See #private_diffie_hellman_t.set_modulus for description.
*/
static status_t set_modulus(private_diffie_hellman_t *this)
{
int i;
status_t status = NOT_FOUND;
for (i = 0; i < (sizeof(modulus_info_entries) / sizeof(modulus_info_entry_t)); i++)
{
if (modulus_info_entries[i].group == this->dh_group_number)
{
chunk_t modulus_chunk;
modulus_chunk.ptr = modulus_info_entries[i].modulus;
modulus_chunk.len = modulus_info_entries[i].modulus_length;
this->gmp_helper->chunk_to_mpz(this->gmp_helper,&(this->modulus),modulus_chunk);
this->modulus_length = modulus_chunk.len;
this->generator = modulus_info_entries[i].generator;
status = SUCCESS;
break;
}
}
return status;
}
/**
* Implements diffie_hellman_t's set_other_public_value function.
* See #diffie_hellman_t.set_other_public_value for description.
*/
static status_t set_other_public_value(private_diffie_hellman_t *this,chunk_t public_value)
{
this->gmp_helper->chunk_to_mpz(this->gmp_helper,&(this->other_public_value),public_value);
this->compute_shared_secret(this);
return SUCCESS;
}
/**
* Implements diffie_hellman_t's get_other_public_value function.
* See #diffie_hellman_t.get_other_public_value for description.
*/
static status_t get_other_public_value(private_diffie_hellman_t *this,chunk_t *public_value)
{
if (!this->shared_secret_is_computed)
{
return FAILED;
}
return (this->gmp_helper->mpz_to_chunk(this->gmp_helper,&(this->other_public_value), public_value,this->modulus_length));
}
/**
* Implements private_diffie_hellman_t's compute_shared_secret function.
* See #private_diffie_hellman_t.compute_shared_secret for description.
*/
static void compute_shared_secret (private_diffie_hellman_t *this)
{
/* initialize my public value */
mpz_init(this->shared_secret);
/* calculate my public value */
mpz_powm(this->shared_secret,this->other_public_value,this->my_prime,this->modulus);
this->shared_secret_is_computed = TRUE;
}
/**
* Implements private_diffie_hellman_t's compute_public_value function.
* See #private_diffie_hellman_t.compute_public_value for description.
*/
static void compute_public_value (private_diffie_hellman_t *this)
{
mpz_t generator;
/* initialize generator and set it*/
mpz_init_set_ui (generator,this->generator);
/* initialize my public value */
mpz_init(this->my_public_value);
/* calculate my public value */
mpz_powm(this->my_public_value,generator,this->my_prime,this->modulus);
/* generator not used anymore */
mpz_clear(generator);
this->my_public_value_is_computed = TRUE;
}
/**
* Implements diffie_hellman_t's get_my_public_value function.
* See #diffie_hellman_t.get_my_public_value for description.
*/
static status_t get_my_public_value(private_diffie_hellman_t *this,chunk_t *public_value)
{
if (!this->my_public_value_is_computed)
{
this->compute_public_value(this);
}
return (this->gmp_helper->mpz_to_chunk(this->gmp_helper,&(this->my_public_value), public_value,this->modulus_length));
}
/**
* Implements diffie_hellman_t's get_shared_secret function.
* See #diffie_hellman_t.get_shared_secret for description.
*/
static status_t get_shared_secret(private_diffie_hellman_t *this,chunk_t *secret)
{
if (!this->shared_secret_is_computed)
{
return FAILED;
}
return (this->gmp_helper->mpz_to_chunk(this->gmp_helper,&(this->shared_secret), secret,this->modulus_length));
}
/**
* Implements diffie_hellman_t's destroy function.
* See #diffie_hellman_t.destroy for description.
*/
static status_t destroy(private_diffie_hellman_t *this)
{
this->gmp_helper->destroy(this->gmp_helper);
mpz_clear(this->modulus);
mpz_clear(this->my_prime);
if (this->my_public_value_is_computed)
{
mpz_clear(this->my_public_value);
}
if (this->shared_secret_is_computed)
{
/* other public value gets initialized together with shared secret */
mpz_clear(this->other_public_value);
mpz_clear(this->shared_secret);
}
allocator_free(this);
return SUCCESS;
}
/*
* Described in header
*/
diffie_hellman_t *diffie_hellman_create(u_int16_t dh_group_number)
{
private_diffie_hellman_t *this = allocator_alloc_thing(private_diffie_hellman_t);
if ((this == NULL))
{
return NULL;
}
/* public functions */
this->public.get_shared_secret = (status_t (*)(diffie_hellman_t *, chunk_t *)) get_shared_secret;
this->public.set_other_public_value = (status_t (*)(diffie_hellman_t *, chunk_t )) set_other_public_value;
this->public.get_other_public_value = (status_t (*)(diffie_hellman_t *, chunk_t *)) get_other_public_value;
this->public.get_my_public_value = (status_t (*)(diffie_hellman_t *, chunk_t *)) get_my_public_value;
this->public.destroy = (status_t (*)(diffie_hellman_t *)) destroy;
/* private functions */
this->set_modulus = set_modulus;
this->compute_public_value = compute_public_value;
this->compute_shared_secret = compute_shared_secret;
/* private variables */
this->dh_group_number = dh_group_number;
this->gmp_helper = gmp_helper_create();
if (this->gmp_helper == NULL)
{
allocator_free(this);
return NULL;
}
/* set this->modulus */
if (this->set_modulus(this) != SUCCESS)
{
this->gmp_helper->destroy(this->gmp_helper);
allocator_free(this);
return NULL;
}
if (this->gmp_helper->init_prime(this->gmp_helper,&(this->my_prime),10) != SUCCESS)
{
this->gmp_helper->destroy(this->gmp_helper);
allocator_free(this);
return NULL;
}
this->my_public_value_is_computed = FALSE;
this->shared_secret_is_computed = FALSE;
this->modulus_length = 0;
return &(this->public);
}
Source/charon/transforms/diffie_hellman.h
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@@ -0,0 +1,112 @@
/**
* @file diffie_hellman.h
*
* @brief Class to represent a diffie hellman exchange.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#ifndef DIFFIE_HELLMAN_H_
#define DIFFIE_HELLMAN_H_
#include "../types.h"
/**
* Object representing a diffie hellman exchange
*
*/
typedef struct diffie_hellman_s diffie_hellman_t;
struct diffie_hellman_s {
/**
* @brief Returns the shared secret of this diffie hellman exchange
*
* @warning Space for returned secret is allocated and has to get freed by the caller
*
* @param this calling diffie_hellman_t object
* @param[out] secret shared secret will be written into this chunk
* @return
* - SUCCESS
* - FAILED if not both DH values are set
* - OUT_OF_RES if out of ressources
*/
status_t (*get_shared_secret) (diffie_hellman_t *this, chunk_t *secret);
/**
* @brief Sets the public value of partner
*
* @warning chunk gets copied
*
* @param this calling diffie_hellman_t object
* @param public_value public value of partner
* @return
* - SUCCESS
* - OUT_OF_RES if out of ressources
*/
status_t (*set_other_public_value) (diffie_hellman_t *this, chunk_t public_value);
/**
* @brief Gets the public value of partner
*
* @warning chunk gets copied
*
* @param this calling diffie_hellman_t object
* @param[out] public_value public value of partner is stored at this location
* @return
* - SUCCESS
* - OUT_OF_RES if out of ressources
* - FAILED if other public value not set
*/
status_t (*get_other_public_value) (diffie_hellman_t *this, chunk_t *public_value);
/**
* @brief Gets the public value of caller
*
* @warning chunk gets copied
*
* @param this calling diffie_hellman_t object
* @param[out] public_value public value of caller is stored at this location
* @return
* - SUCCESS
* - OUT_OF_RES if out of ressources
*/
status_t (*get_my_public_value) (diffie_hellman_t *this, chunk_t *public_value);
/**
* @brief Destroys an diffie_hellman_t object.
*
* @param this diffie_hellman_t object to destroy
* @return
* SUCCESS in any case
*/
status_t (*destroy) (diffie_hellman_t *this);
};
/**
* Creates a new diffie_hellman_t object
*
* The first diffie hellman public value gets automatically created
*
* @param dh_group_number Diffie Hellman group number to use
* @return
* - diffie_hellman_t if successfully
* - NULL if out of ressources or dh_group not supported
*/
diffie_hellman_t *diffie_hellman_create(u_int16_t dh_group_number);
#endif /*DIFFIE_HELLMAN_H_*/
Source/charon/utils/gmp_helper.c
+1
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@@ -130,6 +130,7 @@ static status_t init_prime (private_gmp_helper_t *this, mpz_t *prime, int bytes)
allocator_free(random_bytes.ptr);
random_bytes.ptr = NULL;
/* composites are possible but should never occur */
mpz_nextprime (*(prime),*(prime));
return SUCCESS;
Source/charon/utils/gmp_helper.h
+2
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@@ -53,6 +53,8 @@ struct gmp_helper_s {
status_t (*init_prime) (gmp_helper_t *this, mpz_t *var, int bytes);
/* Convert network form (binary bytes, big-endian) to mpz_t of gmp library.
*
* mpz_t gets initialized in this function.
*
* @param this calling private_gmp_helper_t object
* @param mpz_value pointer to a mpz_t value