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/* ecc_dh.h - TinyCrypt interface to EC-DH implementation */
/*
* =============================================================================
* Copyright (c) 2013, Kenneth MacKay
* All rights reserved.
* https://github.com/kmackay/micro-ecc
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* =============================================================================
* Copyright (C) 2015 by Intel Corporation, All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* @brief -- Interface to EC-DH implementation.
*
* Overview: This software is an implementation of EC-DH. This implementation
* uses curve NIST p-256.
*
* Security: The curve NIST p-256 provides approximately 128 bits of security.
*
*/
#ifndef __TC_ECC_DH_H__
#define __TC_ECC_DH_H__
#include <tinycrypt/ecc.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Create a public/private key pair.
* @return returns TC_CRYPTO_SUCCESS (1) if the key pair was generated successfully
* returns TC_CRYPTO_FAIL (0) if:
* the private key is 0
*
* @param p_publicKey OUT -- the point representing the public key.
* @param p_privateKey OUT -- the private key.
* @param p_random IN -- The random number to use to generate the key pair.
*
* @note You must use a new non-predictable random number to generate each
* new key pair.
*
* @note side-channel countermeasure: algorithm strengthened against timing
* attack.
*/
int32_t ecc_make_key(EccPoint *p_publicKey,
uint32_t p_privateKey[NUM_ECC_DIGITS],
uint32_t p_random[NUM_ECC_DIGITS]);
/**
* @brief Determine whether or not a given point is on the chosen elliptic curve
* (ie, is a valid public key).
* @return returns 0 if the given point is valid
* returns -1 if: the point is zero
* returns -2 if: curve_p - p_publicKey->x != 1 or
* curve_p - p_publicKey->y != 1
* returns -3 if: y^2 != x^3 + ax + b
* @param p_publicKey IN -- The point to be checked.
*/
int32_t ecc_valid_public_key(EccPoint *p_publicKey);
/**
* @brief Compute a shared secret given your secret key and someone else's
* public key.
* @return returns TC_CRYPTO_SUCCESS (1) if the shared secret was computed successfully
* returns TC_CRYPTO_FAIL (0) otherwise
*
* @param p_secret OUT -- The shared secret value.
* @param p_publicKey IN -- The public key of the remote party.
* @param p_privateKey IN -- Your private key.
*
* @note Optionally, you can provide a random multiplier for resistance to DPA
* attacks. The random multiplier should probably be different for each
* invocation of ecdh_shared_secret().
*
* @note It is recommended that you hash the result of ecdh_shared_secret before
* using it for symmetric encryption or HMAC. If you do not hash the shared
* secret, you must call ecc_valid_public_key() to verify that the remote side's
* public key is valid. If this is not done, an attacker could create a public
* key that would cause your use of the shared secret to leak information about
* the private key.
*/
int32_t ecdh_shared_secret(uint32_t p_secret[NUM_ECC_DIGITS], EccPoint *p_publicKey,
uint32_t p_privateKey[NUM_ECC_DIGITS]);
#ifdef __cplusplus
}
#endif
#endif
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