lib/libcrypto/ec/ecp_nist.c

   1 /* $OpenBSD: ecp_nist.c,v 1.10 2017/01/29 17:49:23 beck 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                 ECerror(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                 ECerror(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                 ECerror(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 }