1 /* $OpenBSD: ecp_nist.c,v 1.19 2022/06/30 11:14:47 tb Exp $ */ 2 /* 3 * Written by Nils Larsch for the OpenSSL project. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * openssl-core@openssl.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 /* ==================================================================== 59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60 * Portions of this software developed by SUN MICROSYSTEMS, INC., 61 * and contributed to the OpenSSL project. 62 */ 63 64 #include <limits.h> 65 66 #include <openssl/err.h> 67 #include <openssl/objects.h> 68 69 #include "ec_lcl.h" 70 71 const EC_METHOD * 72 EC_GFp_nist_method(void) 73 { 74 static const EC_METHOD ret = { 75 .flags = EC_FLAGS_DEFAULT_OCT, 76 .field_type = NID_X9_62_prime_field, 77 .group_init = ec_GFp_simple_group_init, 78 .group_finish = ec_GFp_simple_group_finish, 79 .group_clear_finish = ec_GFp_simple_group_clear_finish, 80 .group_copy = ec_GFp_nist_group_copy, 81 .group_set_curve = ec_GFp_nist_group_set_curve, 82 .group_get_curve = ec_GFp_simple_group_get_curve, 83 .group_get_degree = ec_GFp_simple_group_get_degree, 84 .group_order_bits = ec_group_simple_order_bits, 85 .group_check_discriminant = 86 ec_GFp_simple_group_check_discriminant, 87 .point_init = ec_GFp_simple_point_init, 88 .point_finish = ec_GFp_simple_point_finish, 89 .point_clear_finish = ec_GFp_simple_point_clear_finish, 90 .point_copy = ec_GFp_simple_point_copy, 91 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity, 92 .point_set_Jprojective_coordinates = 93 ec_GFp_simple_set_Jprojective_coordinates, 94 .point_get_Jprojective_coordinates = 95 ec_GFp_simple_get_Jprojective_coordinates, 96 .point_set_affine_coordinates = 97 ec_GFp_simple_point_set_affine_coordinates, 98 .point_get_affine_coordinates = 99 ec_GFp_simple_point_get_affine_coordinates, 100 .add = ec_GFp_simple_add, 101 .dbl = ec_GFp_simple_dbl, 102 .invert = ec_GFp_simple_invert, 103 .is_at_infinity = ec_GFp_simple_is_at_infinity, 104 .is_on_curve = ec_GFp_simple_is_on_curve, 105 .point_cmp = ec_GFp_simple_cmp, 106 .make_affine = ec_GFp_simple_make_affine, 107 .points_make_affine = ec_GFp_simple_points_make_affine, 108 .mul_generator_ct = ec_GFp_simple_mul_generator_ct, 109 .mul_single_ct = ec_GFp_simple_mul_single_ct, 110 .mul_double_nonct = ec_GFp_simple_mul_double_nonct, 111 .field_mul = ec_GFp_nist_field_mul, 112 .field_sqr = ec_GFp_nist_field_sqr, 113 .blind_coordinates = ec_GFp_simple_blind_coordinates, 114 }; 115 116 return &ret; 117 } 118 119 int 120 ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src) 121 { 122 dest->field_mod_func = src->field_mod_func; 123 124 return ec_GFp_simple_group_copy(dest, src); 125 } 126 127 int 128 ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, 129 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 130 { 131 int ret = 0; 132 BN_CTX *new_ctx = NULL; 133 BIGNUM *tmp_bn; 134 135 if (ctx == NULL) 136 if ((ctx = new_ctx = BN_CTX_new()) == NULL) 137 return 0; 138 139 BN_CTX_start(ctx); 140 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) 141 goto err; 142 143 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) 144 group->field_mod_func = BN_nist_mod_192; 145 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) 146 group->field_mod_func = BN_nist_mod_224; 147 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) 148 group->field_mod_func = BN_nist_mod_256; 149 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) 150 group->field_mod_func = BN_nist_mod_384; 151 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) 152 group->field_mod_func = BN_nist_mod_521; 153 else { 154 ECerror(EC_R_NOT_A_NIST_PRIME); 155 goto err; 156 } 157 158 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 159 160 err: 161 BN_CTX_end(ctx); 162 BN_CTX_free(new_ctx); 163 return ret; 164 } 165 166 167 int 168 ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 169 const BIGNUM *b, BN_CTX *ctx) 170 { 171 int ret = 0; 172 BN_CTX *ctx_new = NULL; 173 174 if (!group || !r || !a || !b) { 175 ECerror(ERR_R_PASSED_NULL_PARAMETER); 176 goto err; 177 } 178 if (!ctx) 179 if ((ctx_new = ctx = BN_CTX_new()) == NULL) 180 goto err; 181 182 if (!BN_mul(r, a, b, ctx)) 183 goto err; 184 if (!group->field_mod_func(r, r, &group->field, ctx)) 185 goto err; 186 187 ret = 1; 188 err: 189 BN_CTX_free(ctx_new); 190 return ret; 191 } 192 193 194 int 195 ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a, 196 BN_CTX * ctx) 197 { 198 int ret = 0; 199 BN_CTX *ctx_new = NULL; 200 201 if (!group || !r || !a) { 202 ECerror(EC_R_PASSED_NULL_PARAMETER); 203 goto err; 204 } 205 if (!ctx) 206 if ((ctx_new = ctx = BN_CTX_new()) == NULL) 207 goto err; 208 209 if (!BN_sqr(r, a, ctx)) 210 goto err; 211 if (!group->field_mod_func(r, r, &group->field, ctx)) 212 goto err; 213 214 ret = 1; 215 err: 216 BN_CTX_free(ctx_new); 217 return ret; 218 } 219