/* $OpenBSD: ecp_nist.c,v 1.17 2021/04/20 17:38:02 tb Exp $ */ /* * Written by Nils Larsch for the OpenSSL project. */ /* ==================================================================== * 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). * */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * Portions of this software developed by SUN MICROSYSTEMS, INC., * and contributed to the OpenSSL project. */ #include #include #include #include "ec_lcl.h" const EC_METHOD * EC_GFp_nist_method(void) { static const EC_METHOD ret = { .flags = EC_FLAGS_DEFAULT_OCT, .field_type = NID_X9_62_prime_field, .group_init = ec_GFp_simple_group_init, .group_finish = ec_GFp_simple_group_finish, .group_clear_finish = ec_GFp_simple_group_clear_finish, .group_copy = ec_GFp_nist_group_copy, .group_set_curve = ec_GFp_nist_group_set_curve, .group_get_curve = ec_GFp_simple_group_get_curve, .group_get_degree = ec_GFp_simple_group_get_degree, .group_check_discriminant = ec_GFp_simple_group_check_discriminant, .point_init = ec_GFp_simple_point_init, .point_finish = ec_GFp_simple_point_finish, .point_clear_finish = ec_GFp_simple_point_clear_finish, .point_copy = ec_GFp_simple_point_copy, .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity, .point_set_Jprojective_coordinates = ec_GFp_simple_set_Jprojective_coordinates, .point_get_Jprojective_coordinates = ec_GFp_simple_get_Jprojective_coordinates, .point_set_affine_coordinates = ec_GFp_simple_point_set_affine_coordinates, .point_get_affine_coordinates = ec_GFp_simple_point_get_affine_coordinates, .add = ec_GFp_simple_add, .dbl = ec_GFp_simple_dbl, .invert = ec_GFp_simple_invert, .is_at_infinity = ec_GFp_simple_is_at_infinity, .is_on_curve = ec_GFp_simple_is_on_curve, .point_cmp = ec_GFp_simple_cmp, .make_affine = ec_GFp_simple_make_affine, .points_make_affine = ec_GFp_simple_points_make_affine, .mul_generator_ct = ec_GFp_simple_mul_generator_ct, .mul_single_ct = ec_GFp_simple_mul_single_ct, .mul_double_nonct = ec_GFp_simple_mul_double_nonct, .field_mul = ec_GFp_nist_field_mul, .field_sqr = ec_GFp_nist_field_sqr, .blind_coordinates = ec_GFp_simple_blind_coordinates, }; return &ret; } int ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src) { dest->field_mod_func = src->field_mod_func; return ec_GFp_simple_group_copy(dest, src); } int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { int ret = 0; BN_CTX *new_ctx = NULL; BIGNUM *tmp_bn; if (ctx == NULL) if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0; BN_CTX_start(ctx); if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err; if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) group->field_mod_func = BN_nist_mod_192; else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) group->field_mod_func = BN_nist_mod_224; else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) group->field_mod_func = BN_nist_mod_256; else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) group->field_mod_func = BN_nist_mod_384; else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) group->field_mod_func = BN_nist_mod_521; else { ECerror(EC_R_NOT_A_NIST_PRIME); goto err; } ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); err: BN_CTX_end(ctx); BN_CTX_free(new_ctx); return ret; } int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { int ret = 0; BN_CTX *ctx_new = NULL; if (!group || !r || !a || !b) { ECerror(ERR_R_PASSED_NULL_PARAMETER); goto err; } if (!ctx) if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; if (!BN_mul(r, a, b, ctx)) goto err; if (!group->field_mod_func(r, r, &group->field, ctx)) goto err; ret = 1; err: BN_CTX_free(ctx_new); return ret; } int ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a, BN_CTX * ctx) { int ret = 0; BN_CTX *ctx_new = NULL; if (!group || !r || !a) { ECerror(EC_R_PASSED_NULL_PARAMETER); goto err; } if (!ctx) if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; if (!BN_sqr(r, a, ctx)) goto err; if (!group->field_mod_func(r, r, &group->field, ctx)) goto err; ret = 1; err: BN_CTX_free(ctx_new); return ret; }