crypto/ec/ecp_nist.c

   1 /* crypto/ec/ecp_nist.c */
   2 /*
   3  * Written by Nils Larsch for the OpenSSL project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1998-2002 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 #include <openssl/obj_mac.h>
  66 #include "ec_lcl.h"
  67
  68 const EC_METHOD *EC_GFp_nist_method(void)
  69         {
  70         static const EC_METHOD ret = {
  71                 NID_X9_62_prime_field,
  72                 ec_GFp_nist_group_init,
  73                 ec_GFp_nist_group_finish,
  74                 ec_GFp_nist_group_clear_finish,
  75                 ec_GFp_nist_group_copy,
  76                 ec_GFp_nist_group_set_curve,
  77                 ec_GFp_simple_group_get_curve,
  78                 ec_GFp_simple_group_get_degree,
  79                 ec_GFp_simple_group_check_discriminant,
  80                 ec_GFp_simple_point_init,
  81                 ec_GFp_simple_point_finish,
  82                 ec_GFp_simple_point_clear_finish,
  83                 ec_GFp_simple_point_copy,
  84                 ec_GFp_simple_point_set_to_infinity,
  85                 ec_GFp_simple_set_Jprojective_coordinates_GFp,
  86                 ec_GFp_simple_get_Jprojective_coordinates_GFp,
  87                 ec_GFp_simple_point_set_affine_coordinates,
  88                 ec_GFp_simple_point_get_affine_coordinates,
  89                 ec_GFp_simple_set_compressed_coordinates,
  90                 ec_GFp_simple_point2oct,
  91                 ec_GFp_simple_oct2point,
  92                 ec_GFp_simple_add,
  93                 ec_GFp_simple_dbl,
  94                 ec_GFp_simple_invert,
  95                 0 /* mul */,
  96                 0 /* precompute_mult */,
  97                 ec_GFp_simple_is_at_infinity,
  98                 ec_GFp_simple_is_on_curve,
  99                 ec_GFp_simple_cmp,
 100                 ec_GFp_simple_make_affine,
 101                 ec_GFp_simple_points_make_affine,
 102                 ec_GFp_nist_field_mul,
 103                 ec_GFp_nist_field_sqr,
 104                 0 /* field_div */,
 105                 0 /* field_encode */,
 106                 0 /* field_decode */,
 107                 0 /* field_set_to_one */ };
 108
 109         return &ret;
 110         }
 111
 112 #if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL
 113 #define NO_32_BIT_TYPE
 114 #endif
 115
 116 int ec_GFp_nist_group_init(EC_GROUP *group)
 117         {
 118         int ok;
 119
 120         ok = ec_GFp_simple_group_init(group);
 121         return ok;
 122         }
 123
 124 void ec_GFp_nist_group_finish(EC_GROUP *group)
 125         {
 126         BN_free(&group->field);
 127         BN_free(&group->a);
 128         BN_free(&group->b);
 129         }
 130
 131
 132 void ec_GFp_nist_group_clear_finish(EC_GROUP *group)
 133         {
 134         BN_clear_free(&group->field);
 135         BN_clear_free(&group->a);
 136         BN_clear_free(&group->b);
 137         }
 138
 139
 140 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
 141         const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 142         {
 143         int ret = 0;
 144         BN_CTX *new_ctx = NULL;
 145         BIGNUM *tmp_bn;
 146
 147         if (ctx == NULL)
 148                 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
 149
 150         BN_CTX_start(ctx);
 151         if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err;
 152
 153         if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
 154                 group->field_mod_func = BN_nist_mod_192;
 155         else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
 156                 {
 157 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 158                 group->field_mod_func = BN_nist_mod_224;
 159 #else
 160                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 161                 goto err;
 162 #endif
 163                 }
 164         else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
 165                 {
 166 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 167                 group->field_mod_func = BN_nist_mod_256;
 168 #else
 169                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 170                 goto err;
 171 #endif
 172                 }
 173         else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 174                 {
 175 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 176                 group->field_mod_func = BN_nist_mod_384;
 177 #else
 178                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 179                 goto err;
 180 #endif
 181                 }
 182         else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 183                 /* this one works in the NO_32_BIT_TYPE case */
 184                 group->field_mod_func = BN_nist_mod_521;
 185         else
 186                 {
 187                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_NIST_PRIME);
 188                 goto err;
 189                 }
 190
 191         /* group->field */
 192         if (!BN_copy(&group->field, p)) goto err;
 193         BN_set_sign(&group->field, 0);
 194
 195         /* group->a */
 196         if (!group->field_mod_func(&group->a, a, p, ctx)) goto err;
 197
 198         /* group->b */
 199         if (!group->field_mod_func(&group->b, b, p, ctx)) goto err;
 200
 201         /* group->a_is_minus3 */
 202         if (!BN_add_word(tmp_bn, 3)) goto err;
 203         group->a_is_minus3 = (0 == BN_cmp(tmp_bn, &group->field));
 204
 205         ret = 1;
 206
 207  err:
 208         BN_CTX_end(ctx);
 209         if (new_ctx != NULL)
 210                 BN_CTX_free(new_ctx);
 211         return ret;
 212         }
 213
 214 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
 215         {
 216         if (dest == NULL || src == NULL)
 217                 return 0;
 218
 219         if (!BN_copy(&dest->field, &src->field))
 220                 return 0;
 221         if (!BN_copy(&dest->a, &src->a))
 222                 return 0;
 223         if (!BN_copy(&dest->b, &src->b))
 224                 return 0;
 225
 226         dest->curve_name  = src->curve_name;
 227
 228         dest->a_is_minus3 = src->a_is_minus3;
 229
 230         return 1;
 231         }
 232
 233 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 234         const BIGNUM *b, BN_CTX *ctx)
 235         {
 236         int     ret=0;
 237         BN_CTX  *ctx_new=NULL;
 238
 239         if (!group || !r || !a || !b)
 240                 {
 241                 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 242                 goto err;
 243                 }
 244         if (!ctx)
 245                 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
 246
 247         if (!BN_mul(r, a, b, ctx)) goto err;
 248         if (!group->field_mod_func(r, r, &group->field, ctx))
 249                 goto err;
 250
 251         ret=1;
 252 err:
 253         if (ctx_new)
 254                 BN_CTX_free(ctx_new);
 255         return ret;
 256         }
 257
 258 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 259         BN_CTX *ctx)
 260         {
 261         int     ret=0;
 262         BN_CTX  *ctx_new=NULL;
 263
 264         if (!group || !r || !a)
 265                 {
 266                 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 267                 goto err;
 268                 }
 269         if (!ctx)
 270                 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
 271
 272         if (!BN_sqr(r, a, ctx)) goto err;
 273         if (!group->field_mod_func(r, r, &group->field, ctx))
 274                 goto err;
 275
 276         ret=1;
 277 err:
 278         if (ctx_new)
 279                 BN_CTX_free(ctx_new);
 280         return ret;
 281         }