1 /* $OpenBSD: ecp_nist.c,v 1.8 2014/06/12 15:49:29 deraadt 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/obj_mac.h> 68 #include "ec_lcl.h" 69 70 const EC_METHOD * 71 EC_GFp_nist_method(void) 72 { 73 static const EC_METHOD ret = { 74 .flags = EC_FLAGS_DEFAULT_OCT, 75 .field_type = NID_X9_62_prime_field, 76 .group_init = ec_GFp_simple_group_init, 77 .group_finish = ec_GFp_simple_group_finish, 78 .group_clear_finish = ec_GFp_simple_group_clear_finish, 79 .group_copy = ec_GFp_nist_group_copy, 80 .group_set_curve = ec_GFp_nist_group_set_curve, 81 .group_get_curve = ec_GFp_simple_group_get_curve, 82 .group_get_degree = ec_GFp_simple_group_get_degree, 83 .group_check_discriminant = 84 ec_GFp_simple_group_check_discriminant, 85 .point_init = ec_GFp_simple_point_init, 86 .point_finish = ec_GFp_simple_point_finish, 87 .point_clear_finish = ec_GFp_simple_point_clear_finish, 88 .point_copy = ec_GFp_simple_point_copy, 89 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity, 90 .point_set_Jprojective_coordinates_GFp = 91 ec_GFp_simple_set_Jprojective_coordinates_GFp, 92 .point_get_Jprojective_coordinates_GFp = 93 ec_GFp_simple_get_Jprojective_coordinates_GFp, 94 .point_set_affine_coordinates = 95 ec_GFp_simple_point_set_affine_coordinates, 96 .point_get_affine_coordinates = 97 ec_GFp_simple_point_get_affine_coordinates, 98 .add = ec_GFp_simple_add, 99 .dbl = ec_GFp_simple_dbl, 100 .invert = ec_GFp_simple_invert, 101 .is_at_infinity = ec_GFp_simple_is_at_infinity, 102 .is_on_curve = ec_GFp_simple_is_on_curve, 103 .point_cmp = ec_GFp_simple_cmp, 104 .make_affine = ec_GFp_simple_make_affine, 105 .points_make_affine = ec_GFp_simple_points_make_affine, 106 .field_mul = ec_GFp_nist_field_mul, 107 .field_sqr = ec_GFp_nist_field_sqr 108 }; 109 110 return &ret; 111 } 112 113 int 114 ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src) 115 { 116 dest->field_mod_func = src->field_mod_func; 117 118 return ec_GFp_simple_group_copy(dest, src); 119 } 120 121 int 122 ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, 123 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 124 { 125 int ret = 0; 126 BN_CTX *new_ctx = NULL; 127 BIGNUM *tmp_bn; 128 129 if (ctx == NULL) 130 if ((ctx = new_ctx = BN_CTX_new()) == NULL) 131 return 0; 132 133 BN_CTX_start(ctx); 134 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) 135 goto err; 136 137 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) 138 group->field_mod_func = BN_nist_mod_192; 139 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) 140 group->field_mod_func = BN_nist_mod_224; 141 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) 142 group->field_mod_func = BN_nist_mod_256; 143 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) 144 group->field_mod_func = BN_nist_mod_384; 145 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) 146 group->field_mod_func = BN_nist_mod_521; 147 else { 148 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME); 149 goto err; 150 } 151 152 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 153 154 err: 155 BN_CTX_end(ctx); 156 BN_CTX_free(new_ctx); 157 return ret; 158 } 159 160 161 int 162 ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 163 const BIGNUM *b, BN_CTX *ctx) 164 { 165 int ret = 0; 166 BN_CTX *ctx_new = NULL; 167 168 if (!group || !r || !a || !b) { 169 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER); 170 goto err; 171 } 172 if (!ctx) 173 if ((ctx_new = ctx = BN_CTX_new()) == NULL) 174 goto err; 175 176 if (!BN_mul(r, a, b, ctx)) 177 goto err; 178 if (!group->field_mod_func(r, r, &group->field, ctx)) 179 goto err; 180 181 ret = 1; 182 err: 183 BN_CTX_free(ctx_new); 184 return ret; 185 } 186 187 188 int 189 ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a, 190 BN_CTX * ctx) 191 { 192 int ret = 0; 193 BN_CTX *ctx_new = NULL; 194 195 if (!group || !r || !a) { 196 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER); 197 goto err; 198 } 199 if (!ctx) 200 if ((ctx_new = ctx = BN_CTX_new()) == NULL) 201 goto err; 202 203 if (!BN_sqr(r, a, ctx)) 204 goto err; 205 if (!group->field_mod_func(r, r, &group->field, ctx)) 206 goto err; 207 208 ret = 1; 209 err: 210 BN_CTX_free(ctx_new); 211 return ret; 212 } 213