src/libstrongswan/plugins/wolfssl/wolfssl_x_diffie_hellman.c - manifest_repos/strongswan - Git at Google

 /*
  * Copyright (C) 2020 Tobias Brunner
  * HSR Hochschule fuer Technik Rapperswil
  *
  * Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "wolfssl_common.h"

 #if defined(HAVE_CURVE25519) || defined(HAVE_CURVE448)

 #include "wolfssl_x_diffie_hellman.h"

 #include <utils/debug.h>

 #ifdef HAVE_CURVE25519
 #include <wolfssl/wolfcrypt/curve25519.h>
 #endif
 #ifdef HAVE_CURVE448
 #include <wolfssl/wolfcrypt/curve448.h>
 #endif

 #include <wolfssl/wolfcrypt/fe_operations.h>

 typedef struct private_diffie_hellman_t private_diffie_hellman_t;

 /**
  * Private data
  */
 struct private_diffie_hellman_t {
 	/**
 	 * Public interface.
 	 */
 	diffie_hellman_t public;

 	/**
 	 * Diffie Hellman group number.
 	 */
 	diffie_hellman_group_t group;

 	/**
 	 * Private (public) key
 	 */
 	union {
 #ifdef HAVE_CURVE25519
 		curve25519_key key25519;
 #endif
 #ifdef HAVE_CURVE448
 		curve448_key key448;
 #endif
 	} key;

 	/**
 	 * Shared secret
 	 */
 	chunk_t shared_secret;
 };

 #ifdef HAVE_CURVE25519

 METHOD(diffie_hellman_t, set_other_public_value_25519, bool,
 	private_diffie_hellman_t *this, chunk_t value)
 {
 	word32 len = CURVE25519_KEYSIZE;
 	curve25519_key pub;
 	int ret;

 	if (!diffie_hellman_verify_value(this->group, value))
 	{
 		return FALSE;
 	}

 	ret = wc_curve25519_init(&pub);
 	if (ret != 0)
 	{
 		DBG1(DBG_LIB, "%N public key initialization failed",
 			 diffie_hellman_group_names, this->group);
 		return FALSE;
 	}

 	ret = wc_curve25519_import_public_ex(value.ptr, value.len, &pub,
 										 EC25519_LITTLE_ENDIAN);
 	if (ret != 0)
 	{
 		DBG1(DBG_LIB, "%N public value is malformed",
 			 diffie_hellman_group_names, this->group);
 		return FALSE;
 	}

 	chunk_clear(&this->shared_secret);
 	this->shared_secret = chunk_alloc(len);
 	if (wc_curve25519_shared_secret_ex(&this->key.key25519, &pub,
 					this->shared_secret.ptr, &len, EC25519_LITTLE_ENDIAN) != 0)
 	{
 		DBG1(DBG_LIB, "%N shared secret computation failed",
 			 diffie_hellman_group_names, this->group);
 		chunk_clear(&this->shared_secret);
 		wc_curve25519_free(&pub);
 		return FALSE;
 	}
 	wc_curve25519_free(&pub);
 	return TRUE;
 }

 METHOD(diffie_hellman_t, get_my_public_value_25519, bool,
 	private_diffie_hellman_t *this, chunk_t *value)
 {
 	word32 len = CURVE25519_KEYSIZE;

 	*value = chunk_alloc(len);
 	if (wc_curve25519_export_public_ex(&this->key.key25519, value->ptr, &len,
 									   EC25519_LITTLE_ENDIAN) != 0)
 	{
 		chunk_free(value);
 		return FALSE;
 	}
 	return TRUE;
 }

 METHOD(diffie_hellman_t, set_private_value_25519, bool,
 	private_diffie_hellman_t *this, chunk_t value)
 {
 	curve25519_key pub;
 	u_char basepoint[CURVE25519_KEYSIZE] = {9};
 	word32 len = CURVE25519_KEYSIZE;
 	int ret;

 	ret = wc_curve25519_init(&pub);
 	/* create base point for calculating public key */
 	if (ret == 0)
 	{
 		ret = wc_curve25519_import_public_ex(basepoint, CURVE25519_KEYSIZE,
 											 &pub, EC25519_LITTLE_ENDIAN);
 	}
 	if (ret == 0)
 	{
 		ret = wc_curve25519_import_private_ex(value.ptr, value.len,
 									&this->key.key25519, EC25519_LITTLE_ENDIAN);
 	}
 	if (ret == 0)
 	{
 		ret = wc_curve25519_shared_secret_ex(&this->key.key25519, &pub,
 											 this->key.key25519.p.point, &len,
 											 EC25519_LITTLE_ENDIAN);
 	}
 	return ret == 0;
 }

 #endif /* HAVE_CURVE25519 */

 #ifdef HAVE_CURVE448

 METHOD(diffie_hellman_t, set_other_public_value_448, bool,
 	private_diffie_hellman_t *this, chunk_t value)
 {
 	word32 len = CURVE448_KEY_SIZE;
 	curve448_key pub;
 	int ret;

 	if (!diffie_hellman_verify_value(this->group, value))
 	{
 		return FALSE;
 	}

 	ret = wc_curve448_init(&pub);
 	if (ret != 0)
 	{
 		DBG1(DBG_LIB, "%N public key initialization failed",
 			 diffie_hellman_group_names, this->group);
 		return FALSE;
 	}

 	ret = wc_curve448_import_public_ex(value.ptr, value.len, &pub,
 									   EC448_LITTLE_ENDIAN);
 	if (ret != 0)
 	{
 		DBG1(DBG_LIB, "%N public value is malformed",
 			 diffie_hellman_group_names, this->group);
 		return FALSE;
 	}

 	chunk_clear(&this->shared_secret);
 	this->shared_secret = chunk_alloc(len);
 	if (wc_curve448_shared_secret_ex(&this->key.key448, &pub,
 					this->shared_secret.ptr, &len, EC448_LITTLE_ENDIAN) != 0)
 	{
 		DBG1(DBG_LIB, "%N shared secret computation failed",
 			 diffie_hellman_group_names, this->group);
 		chunk_clear(&this->shared_secret);
 		wc_curve448_free(&pub);
 		return FALSE;
 	}
 	wc_curve448_free(&pub);
 	return TRUE;
 }

 METHOD(diffie_hellman_t, get_my_public_value_448, bool,
 	private_diffie_hellman_t *this, chunk_t *value)
 {
 	word32 len = CURVE448_KEY_SIZE;

 	*value = chunk_alloc(len);
 	if (wc_curve448_export_public_ex(&this->key.key448, value->ptr, &len,
 									 EC448_LITTLE_ENDIAN) != 0)
 	{
 		chunk_free(value);
 		return FALSE;
 	}
 	return TRUE;
 }

 METHOD(diffie_hellman_t, set_private_value_448, bool,
 	private_diffie_hellman_t *this, chunk_t value)
 {
 	curve448_key pub;
 	u_char basepoint[CURVE448_KEY_SIZE] = {5};
 	word32 len = CURVE448_KEY_SIZE;
 	int ret;

 	ret = wc_curve448_init(&pub);
 	/* create base point for calculating public key */
 	if (ret == 0)
 	{
 		ret = wc_curve448_import_public_ex(basepoint, CURVE448_KEY_SIZE,
 										   &pub, EC448_LITTLE_ENDIAN);
 	}
 	if (ret == 0)
 	{
 		ret = wc_curve448_import_private_ex(value.ptr, value.len,
 										&this->key.key448, EC448_LITTLE_ENDIAN);
 	}
 	if (ret == 0)
 	{
 		ret = wc_curve448_shared_secret_ex(&this->key.key448, &pub,
 										   this->key.key448.p, &len,
 										   EC448_LITTLE_ENDIAN);
 	}
 	return ret == 0;
 }

 #endif /* HAVE_CURVE448 */

 METHOD(diffie_hellman_t, get_shared_secret, bool,
 	private_diffie_hellman_t *this, chunk_t *secret)
 {
 	if (!this->shared_secret.len)
 	{
 		return FALSE;
 	}
 	*secret = chunk_clone(this->shared_secret);
 	return TRUE;
 }

 METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t,
 	private_diffie_hellman_t *this)
 {
 	return this->group;
 }

 METHOD(diffie_hellman_t, destroy, void,
 	private_diffie_hellman_t *this)
 {
 	if (this->group == CURVE_25519)
 	{
 #ifdef HAVE_CURVE25519
 		wc_curve25519_free(&this->key.key25519);
 #endif
 	}
 	else if (this->group == CURVE_448)
 	{
 #ifdef HAVE_CURVE448
 		wc_curve448_free(&this->key.key448);
 #endif
 	}
 	chunk_clear(&this->shared_secret);
 	free(this);
 }

 /*
  * Described in header
  */
 diffie_hellman_t *wolfssl_x_diffie_hellman_create(diffie_hellman_group_t group)
 {
 	private_diffie_hellman_t *this;
 	WC_RNG rng;
 	int ret = -1;

 	INIT(this,
 		.public = {
 			.get_shared_secret = _get_shared_secret,
 			.get_dh_group = _get_dh_group,
 			.destroy = _destroy,
 		},
 		.group = group,
 	);

 	if (wc_InitRng(&rng) != 0)
 	{
 		DBG1(DBG_LIB, "initializing a random number generator failed");
 		destroy(this);
 		return NULL;
 	}

 	if (group == CURVE_25519)
 	{
 #ifdef HAVE_CURVE25519
 		this->public.set_other_public_value = _set_other_public_value_25519;
 		this->public.get_my_public_value = _get_my_public_value_25519;
 		this->public.set_private_value = _set_private_value_25519;

 		if (wc_curve25519_init(&this->key.key25519) != 0)
 		{
 			DBG1(DBG_LIB, "initializing key failed");
 			free(this);
 			return NULL;
 		}
 		ret = wc_curve25519_make_key(&rng, CURVE25519_KEYSIZE,
 									 &this->key.key25519);
 #endif
 	}
 	else if (group == CURVE_448)
 	{
 #ifdef HAVE_CURVE448
 		this->public.set_other_public_value = _set_other_public_value_448;
 		this->public.get_my_public_value = _get_my_public_value_448;
 		this->public.set_private_value = _set_private_value_448;

 		if (wc_curve448_init(&this->key.key448) != 0)
 		{
 			DBG1(DBG_LIB, "initializing key failed");
 			free(this);
 			return NULL;
 		}
 		ret = wc_curve448_make_key(&rng, CURVE448_KEY_SIZE, &this->key.key448);
 #endif
 	}
 	wc_FreeRng(&rng);
 	if (ret != 0)
 	{
 		DBG1(DBG_LIB, "making a key failed");
 		destroy(this);
 		return NULL;
 	}
 	return &this->public;
 }

 #endif /* HAVE_CURVE25519 || HAVE_CURVE448 */
	/*
	* Copyright (C) 2020 Tobias Brunner
	* HSR Hochschule fuer Technik Rapperswil
	*
	* Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "wolfssl_common.h"

	#if defined(HAVE_CURVE25519) \|\| defined(HAVE_CURVE448)

	#include "wolfssl_x_diffie_hellman.h"

	#include <utils/debug.h>

	#ifdef HAVE_CURVE25519
	#include <wolfssl/wolfcrypt/curve25519.h>
	#endif
	#ifdef HAVE_CURVE448
	#include <wolfssl/wolfcrypt/curve448.h>
	#endif

	#include <wolfssl/wolfcrypt/fe_operations.h>

	typedef struct private_diffie_hellman_t private_diffie_hellman_t;

	/**
	* Private data
	*/
	struct private_diffie_hellman_t {
	/**
	* Public interface.
	*/
	diffie_hellman_t public;

	/**
	* Diffie Hellman group number.
	*/
	diffie_hellman_group_t group;

	/**
	* Private (public) key
	*/
	union {
	#ifdef HAVE_CURVE25519
	curve25519_key key25519;
	#endif
	#ifdef HAVE_CURVE448
	curve448_key key448;
	#endif
	} key;

	/**
	* Shared secret
	*/
	chunk_t shared_secret;
	};

	#ifdef HAVE_CURVE25519

	METHOD(diffie_hellman_t, set_other_public_value_25519, bool,
	private_diffie_hellman_t *this, chunk_t value)
	{
	word32 len = CURVE25519_KEYSIZE;
	curve25519_key pub;
	int ret;

	if (!diffie_hellman_verify_value(this->group, value))
	{
	return FALSE;
	}

	ret = wc_curve25519_init(&pub);
	if (ret != 0)
	{
	DBG1(DBG_LIB, "%N public key initialization failed",
	diffie_hellman_group_names, this->group);
	return FALSE;
	}

	ret = wc_curve25519_import_public_ex(value.ptr, value.len, &pub,
	EC25519_LITTLE_ENDIAN);
	if (ret != 0)
	{
	DBG1(DBG_LIB, "%N public value is malformed",
	diffie_hellman_group_names, this->group);
	return FALSE;
	}

	chunk_clear(&this->shared_secret);
	this->shared_secret = chunk_alloc(len);
	if (wc_curve25519_shared_secret_ex(&this->key.key25519, &pub,
	this->shared_secret.ptr, &len, EC25519_LITTLE_ENDIAN) != 0)
	{
	DBG1(DBG_LIB, "%N shared secret computation failed",
	diffie_hellman_group_names, this->group);
	chunk_clear(&this->shared_secret);
	wc_curve25519_free(&pub);
	return FALSE;
	}
	wc_curve25519_free(&pub);
	return TRUE;
	}

	METHOD(diffie_hellman_t, get_my_public_value_25519, bool,
	private_diffie_hellman_t this, chunk_t value)
	{
	word32 len = CURVE25519_KEYSIZE;

	*value = chunk_alloc(len);
	if (wc_curve25519_export_public_ex(&this->key.key25519, value->ptr, &len,
	EC25519_LITTLE_ENDIAN) != 0)
	{
	chunk_free(value);
	return FALSE;
	}
	return TRUE;
	}

	METHOD(diffie_hellman_t, set_private_value_25519, bool,
	private_diffie_hellman_t *this, chunk_t value)
	{
	curve25519_key pub;
	u_char basepoint[CURVE25519_KEYSIZE] = {9};
	word32 len = CURVE25519_KEYSIZE;
	int ret;

	ret = wc_curve25519_init(&pub);
	/* create base point for calculating public key */
	if (ret == 0)
	{
	ret = wc_curve25519_import_public_ex(basepoint, CURVE25519_KEYSIZE,
	&pub, EC25519_LITTLE_ENDIAN);
	}
	if (ret == 0)
	{
	ret = wc_curve25519_import_private_ex(value.ptr, value.len,
	&this->key.key25519, EC25519_LITTLE_ENDIAN);
	}
	if (ret == 0)
	{
	ret = wc_curve25519_shared_secret_ex(&this->key.key25519, &pub,
	this->key.key25519.p.point, &len,
	EC25519_LITTLE_ENDIAN);
	}
	return ret == 0;
	}

	#endif /* HAVE_CURVE25519 */

	#ifdef HAVE_CURVE448

	METHOD(diffie_hellman_t, set_other_public_value_448, bool,
	private_diffie_hellman_t *this, chunk_t value)
	{
	word32 len = CURVE448_KEY_SIZE;
	curve448_key pub;
	int ret;

	if (!diffie_hellman_verify_value(this->group, value))
	{
	return FALSE;
	}

	ret = wc_curve448_init(&pub);
	if (ret != 0)
	{
	DBG1(DBG_LIB, "%N public key initialization failed",
	diffie_hellman_group_names, this->group);
	return FALSE;
	}

	ret = wc_curve448_import_public_ex(value.ptr, value.len, &pub,
	EC448_LITTLE_ENDIAN);
	if (ret != 0)
	{
	DBG1(DBG_LIB, "%N public value is malformed",
	diffie_hellman_group_names, this->group);
	return FALSE;
	}

	chunk_clear(&this->shared_secret);
	this->shared_secret = chunk_alloc(len);
	if (wc_curve448_shared_secret_ex(&this->key.key448, &pub,
	this->shared_secret.ptr, &len, EC448_LITTLE_ENDIAN) != 0)
	{
	DBG1(DBG_LIB, "%N shared secret computation failed",
	diffie_hellman_group_names, this->group);
	chunk_clear(&this->shared_secret);
	wc_curve448_free(&pub);
	return FALSE;
	}
	wc_curve448_free(&pub);
	return TRUE;
	}

	METHOD(diffie_hellman_t, get_my_public_value_448, bool,
	private_diffie_hellman_t this, chunk_t value)
	{
	word32 len = CURVE448_KEY_SIZE;

	*value = chunk_alloc(len);
	if (wc_curve448_export_public_ex(&this->key.key448, value->ptr, &len,
	EC448_LITTLE_ENDIAN) != 0)
	{
	chunk_free(value);
	return FALSE;
	}
	return TRUE;
	}

	METHOD(diffie_hellman_t, set_private_value_448, bool,
	private_diffie_hellman_t *this, chunk_t value)
	{
	curve448_key pub;
	u_char basepoint[CURVE448_KEY_SIZE] = {5};
	word32 len = CURVE448_KEY_SIZE;
	int ret;

	ret = wc_curve448_init(&pub);
	/* create base point for calculating public key */
	if (ret == 0)
	{
	ret = wc_curve448_import_public_ex(basepoint, CURVE448_KEY_SIZE,
	&pub, EC448_LITTLE_ENDIAN);
	}
	if (ret == 0)
	{
	ret = wc_curve448_import_private_ex(value.ptr, value.len,
	&this->key.key448, EC448_LITTLE_ENDIAN);
	}
	if (ret == 0)
	{
	ret = wc_curve448_shared_secret_ex(&this->key.key448, &pub,
	this->key.key448.p, &len,
	EC448_LITTLE_ENDIAN);
	}
	return ret == 0;
	}

	#endif /* HAVE_CURVE448 */

	METHOD(diffie_hellman_t, get_shared_secret, bool,
	private_diffie_hellman_t this, chunk_t secret)
	{
	if (!this->shared_secret.len)
	{
	return FALSE;
	}
	*secret = chunk_clone(this->shared_secret);
	return TRUE;
	}

	METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t,
	private_diffie_hellman_t *this)
	{
	return this->group;
	}

	METHOD(diffie_hellman_t, destroy, void,
	private_diffie_hellman_t *this)
	{
	if (this->group == CURVE_25519)
	{
	#ifdef HAVE_CURVE25519
	wc_curve25519_free(&this->key.key25519);
	#endif
	}
	else if (this->group == CURVE_448)
	{
	#ifdef HAVE_CURVE448
	wc_curve448_free(&this->key.key448);
	#endif
	}
	chunk_clear(&this->shared_secret);
	free(this);
	}

	/*
	* Described in header
	*/
	diffie_hellman_t *wolfssl_x_diffie_hellman_create(diffie_hellman_group_t group)
	{
	private_diffie_hellman_t *this;
	WC_RNG rng;
	int ret = -1;

	INIT(this,
	.public = {
	.get_shared_secret = _get_shared_secret,
	.get_dh_group = _get_dh_group,
	.destroy = _destroy,
	},
	.group = group,
	);

	if (wc_InitRng(&rng) != 0)
	{
	DBG1(DBG_LIB, "initializing a random number generator failed");
	destroy(this);
	return NULL;
	}

	if (group == CURVE_25519)
	{
	#ifdef HAVE_CURVE25519
	this->public.set_other_public_value = _set_other_public_value_25519;
	this->public.get_my_public_value = _get_my_public_value_25519;
	this->public.set_private_value = _set_private_value_25519;

	if (wc_curve25519_init(&this->key.key25519) != 0)
	{
	DBG1(DBG_LIB, "initializing key failed");
	free(this);
	return NULL;
	}
	ret = wc_curve25519_make_key(&rng, CURVE25519_KEYSIZE,
	&this->key.key25519);
	#endif
	}
	else if (group == CURVE_448)
	{
	#ifdef HAVE_CURVE448
	this->public.set_other_public_value = _set_other_public_value_448;
	this->public.get_my_public_value = _get_my_public_value_448;
	this->public.set_private_value = _set_private_value_448;

	if (wc_curve448_init(&this->key.key448) != 0)
	{
	DBG1(DBG_LIB, "initializing key failed");
	free(this);
	return NULL;
	}
	ret = wc_curve448_make_key(&rng, CURVE448_KEY_SIZE, &this->key.key448);
	#endif
	}
	wc_FreeRng(&rng);
	if (ret != 0)
	{
	DBG1(DBG_LIB, "making a key failed");
	destroy(this);
	return NULL;
	}
	return &this->public;
	}

	#endif /* HAVE_CURVE25519 \|\| HAVE_CURVE448 */