1 /* $OpenBSD: ecp_mont.c,v 1.9 2014/07/12 16:03:37 miod Exp $ */ 2 /* 3 * Originally written by Bodo Moeller for the OpenSSL project. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1998-2001 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 <openssl/err.h> 65 66 #include "ec_lcl.h" 67 68 69 const EC_METHOD * 70 EC_GFp_mont_method(void) 71 { 72 static const EC_METHOD ret = { 73 .flags = EC_FLAGS_DEFAULT_OCT, 74 .field_type = NID_X9_62_prime_field, 75 .group_init = ec_GFp_mont_group_init, 76 .group_finish = ec_GFp_mont_group_finish, 77 .group_clear_finish = ec_GFp_mont_group_clear_finish, 78 .group_copy = ec_GFp_mont_group_copy, 79 .group_set_curve = ec_GFp_mont_group_set_curve, 80 .group_get_curve = ec_GFp_simple_group_get_curve, 81 .group_get_degree = ec_GFp_simple_group_get_degree, 82 .group_check_discriminant = 83 ec_GFp_simple_group_check_discriminant, 84 .point_init = ec_GFp_simple_point_init, 85 .point_finish = ec_GFp_simple_point_finish, 86 .point_clear_finish = ec_GFp_simple_point_clear_finish, 87 .point_copy = ec_GFp_simple_point_copy, 88 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity, 89 .point_set_Jprojective_coordinates_GFp = 90 ec_GFp_simple_set_Jprojective_coordinates_GFp, 91 .point_get_Jprojective_coordinates_GFp = 92 ec_GFp_simple_get_Jprojective_coordinates_GFp, 93 .point_set_affine_coordinates = 94 ec_GFp_simple_point_set_affine_coordinates, 95 .point_get_affine_coordinates = 96 ec_GFp_simple_point_get_affine_coordinates, 97 .add = ec_GFp_simple_add, 98 .dbl = ec_GFp_simple_dbl, 99 .invert = ec_GFp_simple_invert, 100 .is_at_infinity = ec_GFp_simple_is_at_infinity, 101 .is_on_curve = ec_GFp_simple_is_on_curve, 102 .point_cmp = ec_GFp_simple_cmp, 103 .make_affine = ec_GFp_simple_make_affine, 104 .points_make_affine = ec_GFp_simple_points_make_affine, 105 .field_mul = ec_GFp_mont_field_mul, 106 .field_sqr = ec_GFp_mont_field_sqr, 107 .field_encode = ec_GFp_mont_field_encode, 108 .field_decode = ec_GFp_mont_field_decode, 109 .field_set_to_one = ec_GFp_mont_field_set_to_one 110 }; 111 112 return &ret; 113 } 114 115 116 int 117 ec_GFp_mont_group_init(EC_GROUP * group) 118 { 119 int ok; 120 121 ok = ec_GFp_simple_group_init(group); 122 group->field_data1 = NULL; 123 group->field_data2 = NULL; 124 return ok; 125 } 126 127 128 void 129 ec_GFp_mont_group_finish(EC_GROUP * group) 130 { 131 BN_MONT_CTX_free(group->field_data1); 132 group->field_data1 = NULL; 133 BN_free(group->field_data2); 134 group->field_data2 = NULL; 135 ec_GFp_simple_group_finish(group); 136 } 137 138 139 void 140 ec_GFp_mont_group_clear_finish(EC_GROUP * group) 141 { 142 BN_MONT_CTX_free(group->field_data1); 143 group->field_data1 = NULL; 144 BN_clear_free(group->field_data2); 145 group->field_data2 = NULL; 146 ec_GFp_simple_group_clear_finish(group); 147 } 148 149 150 int 151 ec_GFp_mont_group_copy(EC_GROUP * dest, const EC_GROUP * src) 152 { 153 BN_MONT_CTX_free(dest->field_data1); 154 dest->field_data1 = NULL; 155 BN_clear_free(dest->field_data2); 156 dest->field_data2 = NULL; 157 158 if (!ec_GFp_simple_group_copy(dest, src)) 159 return 0; 160 161 if (src->field_data1 != NULL) { 162 dest->field_data1 = BN_MONT_CTX_new(); 163 if (dest->field_data1 == NULL) 164 return 0; 165 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) 166 goto err; 167 } 168 if (src->field_data2 != NULL) { 169 dest->field_data2 = BN_dup(src->field_data2); 170 if (dest->field_data2 == NULL) 171 goto err; 172 } 173 return 1; 174 175 err: 176 if (dest->field_data1 != NULL) { 177 BN_MONT_CTX_free(dest->field_data1); 178 dest->field_data1 = NULL; 179 } 180 return 0; 181 } 182 183 184 int 185 ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, 186 const BIGNUM *b, BN_CTX *ctx) 187 { 188 BN_CTX *new_ctx = NULL; 189 BN_MONT_CTX *mont = NULL; 190 BIGNUM *one = NULL; 191 int ret = 0; 192 193 BN_MONT_CTX_free(group->field_data1); 194 group->field_data1 = NULL; 195 BN_free(group->field_data2); 196 group->field_data2 = NULL; 197 if (ctx == NULL) { 198 ctx = new_ctx = BN_CTX_new(); 199 if (ctx == NULL) 200 return 0; 201 } 202 mont = BN_MONT_CTX_new(); 203 if (mont == NULL) 204 goto err; 205 if (!BN_MONT_CTX_set(mont, p, ctx)) { 206 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 207 goto err; 208 } 209 one = BN_new(); 210 if (one == NULL) 211 goto err; 212 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) 213 goto err; 214 215 group->field_data1 = mont; 216 mont = NULL; 217 group->field_data2 = one; 218 one = NULL; 219 220 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 221 222 if (!ret) { 223 BN_MONT_CTX_free(group->field_data1); 224 group->field_data1 = NULL; 225 BN_free(group->field_data2); 226 group->field_data2 = NULL; 227 } 228 err: 229 BN_CTX_free(new_ctx); 230 BN_MONT_CTX_free(mont); 231 BN_free(one); 232 return ret; 233 } 234 235 236 int 237 ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 238 const BIGNUM *b, BN_CTX *ctx) 239 { 240 if (group->field_data1 == NULL) { 241 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 242 return 0; 243 } 244 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 245 } 246 247 248 int 249 ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 250 BN_CTX *ctx) 251 { 252 if (group->field_data1 == NULL) { 253 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 254 return 0; 255 } 256 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 257 } 258 259 260 int 261 ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 262 BN_CTX *ctx) 263 { 264 if (group->field_data1 == NULL) { 265 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 266 return 0; 267 } 268 return BN_to_montgomery(r, a, (BN_MONT_CTX *) group->field_data1, ctx); 269 } 270 271 272 int 273 ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 274 BN_CTX *ctx) 275 { 276 if (group->field_data1 == NULL) { 277 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 278 return 0; 279 } 280 return BN_from_montgomery(r, a, group->field_data1, ctx); 281 } 282 283 284 int 285 ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) 286 { 287 if (group->field_data2 == NULL) { 288 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 289 return 0; 290 } 291 if (!BN_copy(r, group->field_data2)) 292 return 0; 293 return 1; 294 } 295