/* ecc_dh.h - TinyCrypt interface to EC-DSA 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-DSA implementation. * * Overview: This software is an implementation of EC-DSA. This implementation * uses curve NIST p-256. * * Security: The curve NIST p-256 provides approximately 128 bits of security. * * Usage: - To sign: Compute a hash of the data you wish to sign (SHA-2 is * recommended) and pass it in to ecdsa_sign function along with your * private key and a random number. You must use a new non-predictable * random number to generate each new signature. * - To verify a signature: Compute the hash of the signed data using * the same hash as the signer and pass it to this function along with * the signer's public key and the signature values (r and s). */ #ifndef __TC_ECC_DSA_H__ #define __TC_ECC_DSA_H__ #include #ifdef __cplusplus extern "C" { #endif /** * @brief Generate an ECDSA signature for a given hash value. * @return returns TC_CRYPTO_SUCCESS (1) if the signature generated successfully * returns TC_CRYPTO_FAIL (0) if an error occurred. * * @param p_private_key IN -- Your private key. * @param p_message_hash IN -- The hash of the message to sign. * @param p_hash_size IN -- The size of p_message_hash in bytes. * @param p_signature OUT -- Will be filled in with the signature value. Must be * at least 2 * curve size long (for secp256r1, signature must be 64 bytes long). * * @warning A cryptographically-secure PRNG function must be set (using * uECC_set_rng()) before calling uECC_sign(). * @note Usage: Compute a hash of the data you wish to sign (SHA-2 is * recommended) and pass it in to this function along with your private key. * @note side-channel countermeasure: algorithm strengthened against timing * attack. */ int uECC_sign(const uint8_t *p_private_key, const uint8_t *p_message_hash, unsigned p_hash_size, uint8_t *p_signature, uECC_Curve curve); #ifdef ENABLE_TESTS /* * THIS FUNCTION SHOULD BE CALLED FOR TEST PURPOSES ONLY. * Refer to uECC_sign() function for real applications. */ int uECC_sign_with_k(const uint8_t *private_key, const uint8_t *message_hash, unsigned int hash_size, uECC_word_t *k, uint8_t *signature, uECC_Curve curve); #endif /** * @brief Verify an ECDSA signature. * @return returns TC_SUCCESS (1) if the signature is valid * returns TC_FAIL (0) if the signature is invalid. * * @param p_public_key IN -- The signer's public key. * @param p_message_hash IN -- The hash of the signed data. * @param p_hash_size IN -- The size of p_message_hash in bytes. * @param p_signature IN -- The signature values. * * @note Usage: Compute the hash of the signed data using the same hash as the * signer and pass it to this function along with the signer's public key and * the signature values (hash_size and signature). */ int uECC_verify(const uint8_t *p_public_key, const uint8_t *p_message_hash, unsigned int p_hash_size, const uint8_t *p_signature, uECC_Curve curve); #ifdef __cplusplus } #endif #endif /* __TC_ECC_DSA_H__ */