/* $OpenBSD: ech_lib.c,v 1.15 2022/11/26 16:08:52 tb Exp $ */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * * The Elliptic Curve Public-Key Crypto Library (ECC Code) included * herein is developed by SUN MICROSYSTEMS, INC., and is contributed * to the OpenSSL project. * * The ECC Code is licensed pursuant to the OpenSSL open source * license provided below. * * The ECDH software is originally written by Douglas Stebila of * Sun Microsystems Laboratories. * */ /* ==================================================================== * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. * * 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. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED 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 OpenSSL PROJECT OR * ITS 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. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include "ech_local.h" #ifndef OPENSSL_NO_ENGINE #include #endif #include static const ECDH_METHOD *default_ECDH_method = NULL; static void *ecdh_data_new(void); static void *ecdh_data_dup(void *); static void ecdh_data_free(void *); void ECDH_set_default_method(const ECDH_METHOD *meth) { default_ECDH_method = meth; } const ECDH_METHOD * ECDH_get_default_method(void) { if (!default_ECDH_method) { default_ECDH_method = ECDH_OpenSSL(); } return default_ECDH_method; } int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth) { ECDH_DATA *ecdh; ecdh = ecdh_check(eckey); if (ecdh == NULL) return 0; #ifndef OPENSSL_NO_ENGINE ENGINE_finish(ecdh->engine); ecdh->engine = NULL; #endif ecdh->meth = meth; return 1; } static ECDH_DATA * ECDH_DATA_new_method(ENGINE *engine) { ECDH_DATA *ret; ret = malloc(sizeof(ECDH_DATA)); if (ret == NULL) { ECDHerror(ERR_R_MALLOC_FAILURE); return (NULL); } ret->init = NULL; ret->meth = ECDH_get_default_method(); ret->engine = engine; #ifndef OPENSSL_NO_ENGINE if (!ret->engine) ret->engine = ENGINE_get_default_ECDH(); if (ret->engine) { ret->meth = ENGINE_get_ECDH(ret->engine); if (ret->meth == NULL) { ECDHerror(ERR_R_ENGINE_LIB); ENGINE_finish(ret->engine); free(ret); return NULL; } } #endif ret->flags = ret->meth->flags; CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data); return (ret); } static void * ecdh_data_new(void) { return (void *)ECDH_DATA_new_method(NULL); } static void * ecdh_data_dup(void *data) { ECDH_DATA *r = (ECDH_DATA *)data; /* XXX: dummy operation */ if (r == NULL) return NULL; return (void *)ecdh_data_new(); } void ecdh_data_free(void *data) { ECDH_DATA *r = (ECDH_DATA *)data; #ifndef OPENSSL_NO_ENGINE ENGINE_finish(r->engine); #endif CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data); freezero(r, sizeof(ECDH_DATA)); } ECDH_DATA * ecdh_check(EC_KEY *key) { ECDH_DATA *ecdh_data; void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup, ecdh_data_free, ecdh_data_free); if (data == NULL) { ecdh_data = (ECDH_DATA *)ecdh_data_new(); if (ecdh_data == NULL) return NULL; data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data, ecdh_data_dup, ecdh_data_free, ecdh_data_free); if (data != NULL) { /* Another thread raced us to install the key_method * data and won. */ ecdh_data_free(ecdh_data); ecdh_data = (ECDH_DATA *)data; } } else ecdh_data = (ECDH_DATA *)data; return ecdh_data; } int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) { return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp, new_func, dup_func, free_func); } int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg) { ECDH_DATA *ecdh; ecdh = ecdh_check(d); if (ecdh == NULL) return 0; return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg)); } void * ECDH_get_ex_data(EC_KEY *d, int idx) { ECDH_DATA *ecdh; ecdh = ecdh_check(d); if (ecdh == NULL) return NULL; return (CRYPTO_get_ex_data(&ecdh->ex_data, idx)); } int ECDH_size(const EC_KEY *d) { return ((EC_GROUP_get_degree(EC_KEY_get0_group(d)) + 7) / 8); }