release/src/router/openssl/crypto/ec/ecp_mont.c

   1 /* crypto/ec/ecp_mont.c */
   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 #ifdef OPENSSL_FIPS
  67 #include <openssl/fips.h>
  68 #endif
  69
  70 #include "ec_lcl.h"
  71
  72
  73 const EC_METHOD *EC_GFp_mont_method(void)
  74         {
  75         static const EC_METHOD ret = {
  76                 EC_FLAGS_DEFAULT_OCT,
  77                 NID_X9_62_prime_field,
  78                 ec_GFp_mont_group_init,
  79                 ec_GFp_mont_group_finish,
  80                 ec_GFp_mont_group_clear_finish,
  81                 ec_GFp_mont_group_copy,
  82                 ec_GFp_mont_group_set_curve,
  83                 ec_GFp_simple_group_get_curve,
  84                 ec_GFp_simple_group_get_degree,
  85                 ec_GFp_simple_group_check_discriminant,
  86                 ec_GFp_simple_point_init,
  87                 ec_GFp_simple_point_finish,
  88                 ec_GFp_simple_point_clear_finish,
  89                 ec_GFp_simple_point_copy,
  90                 ec_GFp_simple_point_set_to_infinity,
  91                 ec_GFp_simple_set_Jprojective_coordinates_GFp,
  92                 ec_GFp_simple_get_Jprojective_coordinates_GFp,
  93                 ec_GFp_simple_point_set_affine_coordinates,
  94                 ec_GFp_simple_point_get_affine_coordinates,
  95                 0,0,0,
  96                 ec_GFp_simple_add,
  97                 ec_GFp_simple_dbl,
  98                 ec_GFp_simple_invert,
  99                 ec_GFp_simple_is_at_infinity,
 100                 ec_GFp_simple_is_on_curve,
 101                 ec_GFp_simple_cmp,
 102                 ec_GFp_simple_make_affine,
 103                 ec_GFp_simple_points_make_affine,
 104                 0 /* mul */,
 105                 0 /* precompute_mult */,
 106                 0 /* have_precompute_mult */,
 107                 ec_GFp_mont_field_mul,
 108                 ec_GFp_mont_field_sqr,
 109                 0 /* field_div */,
 110                 ec_GFp_mont_field_encode,
 111                 ec_GFp_mont_field_decode,
 112                 ec_GFp_mont_field_set_to_one };
 113
 114 #ifdef OPENSSL_FIPS
 115         if (FIPS_mode())
 116                 return fips_ec_gfp_mont_method();
 117 #endif
 118
 119         return &ret;
 120         }
 121
 122
 123 int ec_GFp_mont_group_init(EC_GROUP *group)
 124         {
 125         int ok;
 126
 127         ok = ec_GFp_simple_group_init(group);
 128         group->field_data1 = NULL;
 129         group->field_data2 = NULL;
 130         return ok;
 131         }
 132
 133
 134 void ec_GFp_mont_group_finish(EC_GROUP *group)
 135         {
 136         if (group->field_data1 != NULL)
 137                 {
 138                 BN_MONT_CTX_free(group->field_data1);
 139                 group->field_data1 = NULL;
 140                 }
 141         if (group->field_data2 != NULL)
 142                 {
 143                 BN_free(group->field_data2);
 144                 group->field_data2 = NULL;
 145                 }
 146         ec_GFp_simple_group_finish(group);
 147         }
 148
 149
 150 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
 151         {
 152         if (group->field_data1 != NULL)
 153                 {
 154                 BN_MONT_CTX_free(group->field_data1);
 155                 group->field_data1 = NULL;
 156                 }
 157         if (group->field_data2 != NULL)
 158                 {
 159                 BN_clear_free(group->field_data2);
 160                 group->field_data2 = NULL;
 161                 }
 162         ec_GFp_simple_group_clear_finish(group);
 163         }
 164
 165
 166 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
 167         {
 168         if (dest->field_data1 != NULL)
 169                 {
 170                 BN_MONT_CTX_free(dest->field_data1);
 171                 dest->field_data1 = NULL;
 172                 }
 173         if (dest->field_data2 != NULL)
 174                 {
 175                 BN_clear_free(dest->field_data2);
 176                 dest->field_data2 = NULL;
 177                 }
 178
 179         if (!ec_GFp_simple_group_copy(dest, src)) return 0;
 180
 181         if (src->field_data1 != NULL)
 182                 {
 183                 dest->field_data1 = BN_MONT_CTX_new();
 184                 if (dest->field_data1 == NULL) return 0;
 185                 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
 186                 }
 187         if (src->field_data2 != NULL)
 188                 {
 189                 dest->field_data2 = BN_dup(src->field_data2);
 190                 if (dest->field_data2 == NULL) goto err;
 191                 }
 192
 193         return 1;
 194
 195  err:
 196         if (dest->field_data1 != NULL)
 197                 {
 198                 BN_MONT_CTX_free(dest->field_data1);
 199                 dest->field_data1 = NULL;
 200                 }
 201         return 0;
 202         }
 203
 204
 205 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 206         {
 207         BN_CTX *new_ctx = NULL;
 208         BN_MONT_CTX *mont = NULL;
 209         BIGNUM *one = NULL;
 210         int ret = 0;
 211
 212         if (group->field_data1 != NULL)
 213                 {
 214                 BN_MONT_CTX_free(group->field_data1);
 215                 group->field_data1 = NULL;
 216                 }
 217         if (group->field_data2 != NULL)
 218                 {
 219                 BN_free(group->field_data2);
 220                 group->field_data2 = NULL;
 221                 }
 222
 223         if (ctx == NULL)
 224                 {
 225                 ctx = new_ctx = BN_CTX_new();
 226                 if (ctx == NULL)
 227                         return 0;
 228                 }
 229
 230         mont = BN_MONT_CTX_new();
 231         if (mont == NULL) goto err;
 232         if (!BN_MONT_CTX_set(mont, p, ctx))
 233                 {
 234                 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
 235                 goto err;
 236                 }
 237         one = BN_new();
 238         if (one == NULL) goto err;
 239         if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
 240
 241         group->field_data1 = mont;
 242         mont = NULL;
 243         group->field_data2 = one;
 244         one = NULL;
 245
 246         ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 247
 248         if (!ret)
 249                 {
 250                 BN_MONT_CTX_free(group->field_data1);
 251                 group->field_data1 = NULL;
 252                 BN_free(group->field_data2);
 253                 group->field_data2 = NULL;
 254                 }
 255
 256  err:
 257         if (new_ctx != NULL)
 258                 BN_CTX_free(new_ctx);
 259         if (mont != NULL)
 260                 BN_MONT_CTX_free(mont);
 261         return ret;
 262         }
 263
 264
 265 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 266         {
 267         if (group->field_data1 == NULL)
 268                 {
 269                 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
 270                 return 0;
 271                 }
 272
 273         return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
 274         }
 275
 276
 277 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 278         {
 279         if (group->field_data1 == NULL)
 280                 {
 281                 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
 282                 return 0;
 283                 }
 284
 285         return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
 286         }
 287
 288
 289 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 290         {
 291         if (group->field_data1 == NULL)
 292                 {
 293                 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
 294                 return 0;
 295                 }
 296
 297         return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
 298         }
 299
 300
 301 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 302         {
 303         if (group->field_data1 == NULL)
 304                 {
 305                 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
 306                 return 0;
 307                 }
 308
 309         return BN_from_montgomery(r, a, group->field_data1, ctx);
 310         }
 311
 312
 313 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
 314         {
 315         if (group->field_data2 == NULL)
 316                 {
 317                 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
 318                 return 0;
 319                 }
 320
 321         if (!BN_copy(r, group->field_data2)) return 0;
 322         return 1;
 323         }