crypto/libressl/crypto/ec/ecp_mont.c

   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 }