| /* ecc_dh.h - TinyCrypt interface to EC-DH implementation */ |
| |
| /* |
| * Copyright (c) 2014, Kenneth MacKay |
| * 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. |
| * |
| * 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) 2017 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 error while generating key pair |
| * |
| * @param p_public_key OUT -- Will be filled in with the public key. Must be at |
| * least 2 * the curve size (in bytes) long. For curve secp256r1, p_public_key |
| * must be 64 bytes long. |
| * @param p_private_key OUT -- Will be filled in with the private key. Must be as |
| * long as the curve order (for secp256r1, p_private_key must be 32 bytes long). |
| * |
| * @note side-channel countermeasure: algorithm strengthened against timing |
| * attack. |
| * @warning A cryptographically-secure PRNG function must be set (using |
| * uECC_set_rng()) before calling uECC_make_key(). |
| */ |
| int uECC_make_key(uint8_t *p_public_key, uint8_t *p_private_key, uECC_Curve curve); |
| |
| #ifdef ENABLE_TESTS |
| |
| /** |
| * @brief Create a public/private key pair given a specific d. |
| * |
| * @note THIS FUNCTION SHOULD BE CALLED ONLY FOR TEST PURPOSES. Refer to |
| * uECC_make_key() function for real applications. |
| */ |
| int uECC_make_key_with_d(uint8_t *p_public_key, uint8_t *p_private_key, |
| unsigned int *d, uECC_Curve curve); |
| #endif |
| |
| /** |
| * @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 -- Will be filled in with the shared secret value. Must be |
| * the same size as the curve size (for curve secp256r1, secret must be 32 bytes |
| * long. |
| * @param p_public_key IN -- The public key of the remote party. |
| * @param p_private_key IN -- Your private key. |
| * |
| * @warning It is recommended to use the output of uECC_shared_secret() as the |
| * input of a recommended Key Derivation Function (see NIST SP 800-108) in |
| * order to produce a cryptographically secure symmetric key. |
| */ |
| int uECC_shared_secret(const uint8_t *p_public_key, const uint8_t *p_private_key, |
| uint8_t *p_secret, uECC_Curve curve); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* __TC_ECC_DH_H__ */ |