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/* * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* Internal EC functions for other submodules: not for application use */ #ifndef OSSL_CRYPTO_EC_H # define OSSL_CRYPTO_EC_H # include <openssl/opensslconf.h> # ifndef OPENSSL_NO_EC # include <openssl/ec.h> /*- * Computes the multiplicative inverse of x in the range * [1,EC_GROUP::order), where EC_GROUP::order is the cardinality of the * subgroup generated by the generator G: * * res := x^(-1) (mod EC_GROUP::order). * * This function expects the following two conditions to hold: * - the EC_GROUP order is prime, and * - x is included in the range [1, EC_GROUP::order). * * This function returns 1 on success, 0 on error. * * If the EC_GROUP order is even, this function explicitly returns 0 as * an error. * In case any of the two conditions stated above is not satisfied, * the correctness of its output is not guaranteed, even if the return * value could still be 1 (as primality testing and a conditional modular * reduction round on the input can be omitted by the underlying * implementations for better SCA properties on regular input values). */ __owur int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res, const BIGNUM *x, BN_CTX *ctx); /*- * ECDH Key Derivation Function as defined in ANSI X9.63 */ int ecdh_KDF_X9_63(unsigned char *out, size_t outlen, const unsigned char *Z, size_t Zlen, const unsigned char *sinfo, size_t sinfolen, const EVP_MD *md); # endif /* OPENSSL_NO_EC */ #endif