1*f0865ec9SKyle Evans /* 2*f0865ec9SKyle Evans * Copyright (C) 2021 - This file is part of libecc project 3*f0865ec9SKyle Evans * 4*f0865ec9SKyle Evans * Authors: 5*f0865ec9SKyle Evans * Ryad BENADJILA <ryadbenadjila@gmail.com> 6*f0865ec9SKyle Evans * Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr> 7*f0865ec9SKyle Evans * 8*f0865ec9SKyle Evans * This software is licensed under a dual BSD and GPL v2 license. 9*f0865ec9SKyle Evans * See LICENSE file at the root folder of the project. 10*f0865ec9SKyle Evans */ 11*f0865ec9SKyle Evans #include <libecc/lib_ecc_config.h> 12*f0865ec9SKyle Evans #include <libecc/lib_ecc_types.h> 13*f0865ec9SKyle Evans #if defined(WITH_ECCCDH) 14*f0865ec9SKyle Evans 15*f0865ec9SKyle Evans 16*f0865ec9SKyle Evans #ifndef __ECCCDH_H__ 17*f0865ec9SKyle Evans #define __ECCCDH_H__ 18*f0865ec9SKyle Evans 19*f0865ec9SKyle Evans #include <libecc/curves/curves.h> 20*f0865ec9SKyle Evans #include <libecc/sig/ec_key.h> 21*f0865ec9SKyle Evans #include <libecc/utils/utils.h> 22*f0865ec9SKyle Evans 23*f0865ec9SKyle Evans /* Get the size of the shared secret associated to the curve parameters. 24*f0865ec9SKyle Evans * 25*f0865ec9SKyle Evans */ 26*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_shared_secret_size(const ec_params *params, u8 *size); 27*f0865ec9SKyle Evans 28*f0865ec9SKyle Evans /* Get the size of the serialized public key associated to the curve parameters. 29*f0865ec9SKyle Evans * 30*f0865ec9SKyle Evans */ 31*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_serialized_pub_key_size(const ec_params *params, u8 *size); 32*f0865ec9SKyle Evans 33*f0865ec9SKyle Evans /* Initialize ECCCDH public key from an initialized private key. 34*f0865ec9SKyle Evans * 35*f0865ec9SKyle Evans */ 36*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_init_pub_key(ec_pub_key *out_pub, const ec_priv_key *in_priv); 37*f0865ec9SKyle Evans 38*f0865ec9SKyle Evans /* Generate a key pair for ECCCDH given curve parameters as input. 39*f0865ec9SKyle Evans * 40*f0865ec9SKyle Evans */ 41*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_gen_key_pair(ec_key_pair *kp, const ec_params *params); 42*f0865ec9SKyle Evans 43*f0865ec9SKyle Evans /* Create a key pair from a serialized private key. 44*f0865ec9SKyle Evans * 45*f0865ec9SKyle Evans */ 46*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_import_key_pair_from_priv_key_buf(ec_key_pair *kp, const ec_params *params, const u8 *priv_key_buf, u8 priv_key_buf_len); 47*f0865ec9SKyle Evans 48*f0865ec9SKyle Evans /* Serialize our public key in a buffer. 49*f0865ec9SKyle Evans * 50*f0865ec9SKyle Evans */ 51*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_serialize_pub_key(const ec_pub_key *our_pub_key, u8 *buff, u8 buff_len); 52*f0865ec9SKyle Evans 53*f0865ec9SKyle Evans /* Derive the ECCCDH shared secret and store it in a buffer given the peer 54*f0865ec9SKyle Evans * public key and our private key. 55*f0865ec9SKyle Evans * 56*f0865ec9SKyle Evans * The shared_secret_len length MUST be exactly equal to the expected shared secret size: 57*f0865ec9SKyle Evans * the function fails otherwise. 58*f0865ec9SKyle Evans */ 59*f0865ec9SKyle Evans ATTRIBUTE_WARN_UNUSED_RET int ecccdh_derive_secret(const ec_priv_key *our_priv_key, const u8 *peer_pub_key, u8 peer_pub_key_len, u8 *shared_secret, u8 shared_secret_len); 60*f0865ec9SKyle Evans 61*f0865ec9SKyle Evans #endif /* __ECCCDH_H__ */ 62*f0865ec9SKyle Evans 63*f0865ec9SKyle Evans #endif /* WITH_ECCCDH */ 64