Added ECC functions on elliptic curve secp256r1
Lars Schmertmann
parent
aecb591d12
commit
17ff3bb466
|
|
@ -0,0 +1,8 @@
|
|||
CONTIKI = ../..
|
||||
TARGET = econotag
|
||||
|
||||
all: econotag-ecc-test
|
||||
|
||||
APPS += ecc
|
||||
|
||||
include $(CONTIKI)/Makefile.include
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1 @@
|
|||
ecc_src = ecc.c
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,103 @@
|
|||
/*
|
||||
* Copyright (c) 2015, Lars Schmertmann <SmallLars@t-online.de>,
|
||||
* Jens Trillmann <jtrillma@informatik.uni-bremen.de>.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. 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.
|
||||
*
|
||||
* 3. Neither the name of the copyright holder 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 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.
|
||||
*
|
||||
* This file is part of the Contiki operating system.
|
||||
*
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
* Calculations on elliptic curve secp256r1
|
||||
*
|
||||
* This is a efficient ECC implementation on the secp256r1 curve for
|
||||
* 32 Bit CPU architectures. It provides basic operations on the
|
||||
* secp256r1 curve and support for ECDH and ECDSA.
|
||||
*
|
||||
* \author
|
||||
* Lars Schmertmann <SmallLars@t-online.de>
|
||||
* Jens Trillmann <jtrillma@informatik.uni-bremen.de>
|
||||
*/
|
||||
|
||||
#ifndef ECC_H_
|
||||
#define ECC_H_
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
/**
|
||||
* \brief Checks if a (random) number is valid as scalar on elliptic curve secp256r1
|
||||
*
|
||||
* A (random) number is only usable as scalar on elliptic curve secp256r1 if
|
||||
* it is lower than the order of the curve. For the check, you need to provide
|
||||
* the order of elliptic curve secp256r1.
|
||||
*
|
||||
* uint32_t order[8] = {0xFC632551, 0xF3B9CAC2, 0xA7179E84, 0xBCE6FAAD, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0xFFFFFFFF};
|
||||
*
|
||||
* \param key The (random) number to check for usability
|
||||
* \param order The order of elliptic curve secp256r1
|
||||
*
|
||||
* \return 1 if key is valid
|
||||
*/
|
||||
#define ecc_is_valid_key(key, order) (ecc_compare(order, key) == 1)
|
||||
|
||||
/**
|
||||
* \brief Compares the value of a with the value of b
|
||||
*
|
||||
* This function is only public because its needed for the macro ecc_is_valid_key.
|
||||
* It does a comparison of two 256 bit numbers. The return values are 1, 0 or -1.
|
||||
*
|
||||
* \param a First number
|
||||
* \param b Second number
|
||||
*
|
||||
* \return 1 if a is greater than b
|
||||
0 if a is equal to b
|
||||
-1 if a is less than b
|
||||
*/
|
||||
int32_t ecc_compare(const uint32_t *a, const uint32_t *b);
|
||||
|
||||
/**
|
||||
* \brief ECC scalar multiplication on elliptic curve secp256r1
|
||||
*
|
||||
* This function does a scalar multiplication on elliptic curve secp256r1.
|
||||
* For an Elliptic curve Diffie–Hellman you need two multiplications. First one
|
||||
* with the base point of elliptic curve secp256r1 you need to provide.
|
||||
*
|
||||
* uint32_t base_x[8] = {0xd898c296, 0xf4a13945, 0x2deb33a0, 0x77037d81, 0x63a440f2, 0xf8bce6e5, 0xe12c4247, 0x6b17d1f2};
|
||||
* uint32_t base_y[8] = {0x37bf51f5, 0xcbb64068, 0x6b315ece, 0x2bce3357, 0x7c0f9e16, 0x8ee7eb4a, 0xfe1a7f9b, 0x4fe342e2};
|
||||
*
|
||||
* \param resultx Pointer to memory to store the x-coordinate of the result
|
||||
* \param resulty Pointer to memory to store the y-coordinate of the result
|
||||
* \param px x-coordinate of the point to multiply with scalar
|
||||
* \param py y-coordinate of the point to multiply with scalar
|
||||
* \param secret Scalar for multiplication with elliptic curve point
|
||||
*/
|
||||
void ecc_ec_mult(uint32_t *resultx, uint32_t *resulty, const uint32_t *px, const uint32_t *py, const uint32_t *secret);
|
||||
|
||||
#endif /* ECC_H_ */
|
||||
|
|
@ -9,6 +9,7 @@ er-rest-example/econotag \
|
|||
webserver-ipv6/econotag \
|
||||
ipv6/multicast/econotag \
|
||||
econotag-flash-test/econotag \
|
||||
econotag-ecc-test/econotag \
|
||||
|
||||
TOOLS=
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue