/*
* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich.
* All rights reserved.
*
* Author: Andreas Dröscher <contiki@anticat.ch>
*
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*/
/**
* \addtogroup cc2538-ecc
* @{
*
* \defgroup cc2538-ecc-algo cc2538 ECC Algorithms
*
* This is a implementation of ECDH, ECDSA sign and ECDSA verify. It
* uses ecc-driver to communicate with the PKA. It uses continuations
* to free the main CPU / thread while the PKA is calculating.
*
* \note
* Only one request can be processed at a time.
* Maximal supported key length is 384bit (12 words).
* @{
*
* \file
* Header file for the cc2538 ECC Algorithms
*/
#ifndef ECC_ALGORITHM_H_
#define ECC_ALGORITHM_H_
#include "dev/bignum-driver.h"
#include "dev/ecc-driver.h"
typedef struct {
/* Containers for the State */
struct pt pt;
struct process *process;
/* Input Variables */
uint32_t a[12]; /**< Left Number */
uint32_t b[12]; /**< Right Number */
uint8_t size; /**< Length of a and b */
/* Output Variables */
uint8_t result; /**< Result Code */
} ecc_compare_state_t;
/**
* \brief Do a compare of two big numbers
*
* This function can be used for ECDH as well as
* Calculating a Public Key for ECDSA
*/
PT_THREAD(ecc_compare(ecc_compare_state_t *state));
typedef struct {
/* Containers for the State */
struct pt pt;
struct process *process;
/* Input Variables */
ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
ec_point_t point_in; /**< Generator Point */
uint32_t secret[12]; /**< Secret */
/* Variables Holding intermediate data (initialized/used internally) */
uint32_t rv; /**< Address of Next Result in PKA SRAM */
/* Output Variables */
uint8_t result; /**< Result Code */
ec_point_t point_out; /**< Generated Point */
} ecc_multiply_state_t;
/**
* \brief Do a Multiplication on a EC
*
* This function can be used for ECDH as well as
* Calculating a Public Key for ECDSA
*/
PT_THREAD(ecc_multiply(ecc_multiply_state_t *state));
typedef struct {
/* Containers for the State */
struct pt pt;
struct process *process;
/* Input Variables */
ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
uint32_t secret[12]; /**< Secret Key */
uint32_t k_e[12]; /**< Ephemeral Key */
uint32_t hash[12]; /**< Hash to be signed */
/* Variables Holding intermediate data (initialized/used internally) */
uint32_t rv; /**< Address of Next Result in PKA SRAM */
uint32_t k_e_inv[12]; /**< Inverted ephemeral Key */
uint32_t len; /**< Length of intermediate Result */
/* Output Variables */
uint8_t result; /**< Result Code */
ec_point_t point_r; /**< Signature R (x coordinate) */
uint32_t signature_s[24]; /**< Signature S */
} ecc_dsa_sign_state_t;
/**
* \brief Sign a Hash
*
* This function has to be called several times until the
* pt state is EXIT
* If the result code is 0 (SUCCESS) the signature can be
* read from point_r and signature_s
*/
PT_THREAD(ecc_dsa_sign(ecc_dsa_sign_state_t *state));
typedef struct {
/* Containers for the State */
struct pt pt;
struct process *process;
/* Input Variables */
ecc_curve_info_t *curve_info; /**< Curve defining the CyclicGroup */
uint32_t signature_r[12]; /**< Signature R */
uint32_t signature_s[12]; /**< Signature S */
uint32_t hash[12]; /**< Hash to be signed */
ec_point_t public; /**< Signature R (x coordinate) */
/* Variables Holding intermediate data (initialized/used internally) */
uint32_t rv; /**< Address of Next Result in PKA SRAM */
uint32_t s_inv[12]; /**< Inverted ephemeral Key */
uint32_t u1[24]; /**< Intermediate result */
uint32_t u2[24]; /**< Intermediate result */
ec_point_t p1; /**< Intermediate result */
ec_point_t p2; /**< Intermediate result */
uint32_t len; /**< Length of intermediate Result */
/* Output Variables */
uint8_t result; /**< Result Code */
} ecc_dsa_verify_state_t;
/**
* \brief Verify Signature
*
* This function has to be called several times until the
* pt state is EXIT
* If the result code is 0 (SUCCESS) the verification
* was success full.
* \note some error codes signal internal errors
* and others signal falls signatures.
*/
PT_THREAD(ecc_dsa_verify(ecc_dsa_verify_state_t *state));
#endif /* ECC_ALGORITHM_H_ */
/**
* @}
* @}
*/