cc2538: Add PKA drivers, ECC algorithms and examples
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cpu/cc2538/dev/ecc-algorithm.h
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cpu/cc2538/dev/ecc-algorithm.h
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/*
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* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich.
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* All rights reserved.
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*
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* Author: Andreas Dröscher <contiki@anticat.ch>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-ecc
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* @{
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*
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* \defgroup cc2538-ecc-algo cc2538 ECC Algorithms
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*
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* This is a implementation of ECDH, ECDSA sign and ECDSA verify. It
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* uses ecc-driver to communicate with the PKA. It uses continuations
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* to free the main CPU / thread while the PKA is calculating.
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*
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* \note
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* Only one request can be processed at a time.
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* Maximal supported key length is 384bit (12 words).
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* @{
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*
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* \file
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* Header file for the cc2538 ECC Algorithms
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*/
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#ifndef ECC_ALGORITHM_H_
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#define ECC_ALGORITHM_H_
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#include "bignum-driver.h"
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#include "ecc-driver.h"
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typedef struct {
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/* Containers for the State */
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struct pt pt;
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struct process *process;
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/* Input Variables */
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uint32_t a[12]; /**< Left Number */
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uint32_t b[12]; /**< Right Number */
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uint8_t size; /**< Length of a and b */
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/* Output Variables */
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uint8_t result; /**< Result Code */
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} ecc_compare_state_t;
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/**
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* \brief Do a compare of two big numbers
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*
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* This function can be used for ECDH as well as
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* Calculating a Public Key for ECDSA
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*/
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PT_THREAD(ecc_compare(ecc_compare_state_t *state));
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typedef struct {
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/* Containers for the State */
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struct pt pt;
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struct process *process;
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/* Input Variables */
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ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
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ec_point_t point_in; /**< Generator Point */
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uint32_t secret[12]; /**< Secret */
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/* Variables Holding intermediate data (initialized/used internally) */
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uint32_t rv; /**< Address of Next Result in PKA SRAM */
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/* Output Variables */
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uint8_t result; /**< Result Code */
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ec_point_t point_out; /**< Generated Point */
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} ecc_multiply_state_t;
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/**
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* \brief Do a Multiplication on a EC
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*
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* This function can be used for ECDH as well as
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* Calculating a Public Key for ECDSA
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*/
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PT_THREAD(ecc_multiply(ecc_multiply_state_t *state));
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typedef struct {
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/* Containers for the State */
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struct pt pt;
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struct process *process;
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/* Input Variables */
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ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
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uint32_t secret[12]; /**< Secret Key */
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uint32_t k_e[12]; /**< Ephemeral Key */
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uint32_t hash[12]; /**< Hash to be signed */
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/* Variables Holding intermediate data (initialized/used internally) */
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uint32_t rv; /**< Address of Next Result in PKA SRAM */
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uint32_t k_e_inv[12]; /**< Inverted ephemeral Key */
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uint32_t len; /**< Length of intermediate Result */
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/* Output Variables */
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uint8_t result; /**< Result Code */
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ec_point_t point_r; /**< Signature R (x coordinate) */
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uint32_t signature_s[24]; /**< Signature S */
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} ecc_dsa_sign_state_t;
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/**
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* \brief Sign a Hash
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*
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* This function has to be called several times until the
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* pt state is EXIT
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* If the result code is 0 (SUCCESS) the signature can be
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* read from point_r and signature_s
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*/
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PT_THREAD(ecc_dsa_sign(ecc_dsa_sign_state_t *state));
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typedef struct {
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/* Containers for the State */
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struct pt pt;
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struct process *process;
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/* Input Variables */
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ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
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uint32_t signature_r[12]; /**< Signature R */
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uint32_t signature_s[12]; /**< Signature S */
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uint32_t hash[12]; /**< Hash to be signed */
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ec_point_t public; /**< Signature R (x coordinate) */
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/* Variables Holding intermediate data (initialized/used internally) */
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uint32_t rv; /**< Address of Next Result in PKA SRAM */
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uint32_t s_inv[12]; /**< Inverted ephemeral Key */
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uint32_t u1[24]; /**< Intermediate result */
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uint32_t u2[24]; /**< Intermediate result */
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ec_point_t p1; /**< Intermediate result */
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ec_point_t p2; /**< Intermediate result */
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uint32_t len; /**< Length of intermediate Result */
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/* Output Variables */
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uint8_t result; /**< Result Code */
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} ecc_dsa_verify_state_t;
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/**
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* \brief Verify Signature
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*
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* This function has to be called several times until the
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* pt state is EXIT
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* If the result code is 0 (SUCCESS) the verification
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* was success full.
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* \note some error codes signal internal errors
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* and others signal falls signatures.
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*/
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PT_THREAD(ecc_dsa_verify(ecc_dsa_verify_state_t *state));
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#endif /* ECC_ALGORITHM_H_ */
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/**
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* @}
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* @}
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*/
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