release/src/router/openssl/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) 1998-2003 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 #ifdef OPENSSL_FIPS
  71 # include <openssl/fips.h>
  72 #endif
  73
  74 const EC_METHOD *EC_GFp_nist_method(void)
  75 {
  76     static const EC_METHOD ret = {
  77         EC_FLAGS_DEFAULT_OCT,
  78         NID_X9_62_prime_field,
  79         ec_GFp_simple_group_init,
  80         ec_GFp_simple_group_finish,
  81         ec_GFp_simple_group_clear_finish,
  82         ec_GFp_nist_group_copy,
  83         ec_GFp_nist_group_set_curve,
  84         ec_GFp_simple_group_get_curve,
  85         ec_GFp_simple_group_get_degree,
  86         ec_GFp_simple_group_check_discriminant,
  87         ec_GFp_simple_point_init,
  88         ec_GFp_simple_point_finish,
  89         ec_GFp_simple_point_clear_finish,
  90         ec_GFp_simple_point_copy,
  91         ec_GFp_simple_point_set_to_infinity,
  92         ec_GFp_simple_set_Jprojective_coordinates_GFp,
  93         ec_GFp_simple_get_Jprojective_coordinates_GFp,
  94         ec_GFp_simple_point_set_affine_coordinates,
  95         ec_GFp_simple_point_get_affine_coordinates,
  96         0, 0, 0,
  97         ec_GFp_simple_add,
  98         ec_GFp_simple_dbl,
  99         ec_GFp_simple_invert,
 100         ec_GFp_simple_is_at_infinity,
 101         ec_GFp_simple_is_on_curve,
 102         ec_GFp_simple_cmp,
 103         ec_GFp_simple_make_affine,
 104         ec_GFp_simple_points_make_affine,
 105         0 /* mul */ ,
 106         0 /* precompute_mult */ ,
 107         0 /* have_precompute_mult */ ,
 108         ec_GFp_nist_field_mul,
 109         ec_GFp_nist_field_sqr,
 110         0 /* field_div */ ,
 111         0 /* field_encode */ ,
 112         0 /* field_decode */ ,
 113         0                       /* field_set_to_one */
 114     };
 115
 116 #ifdef OPENSSL_FIPS
 117     if (FIPS_mode())
 118         return fips_ec_gfp_nist_method();
 119 #endif
 120
 121     return &ret;
 122 }
 123
 124 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
 125 {
 126     dest->field_mod_func = src->field_mod_func;
 127
 128     return ec_GFp_simple_group_copy(dest, src);
 129 }
 130
 131 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
 132                                 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 133 {
 134     int ret = 0;
 135     BN_CTX *new_ctx = NULL;
 136     BIGNUM *tmp_bn;
 137
 138     if (ctx == NULL)
 139         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
 140             return 0;
 141
 142     BN_CTX_start(ctx);
 143     if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
 144         goto err;
 145
 146     if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
 147         group->field_mod_func = BN_nist_mod_192;
 148     else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
 149         group->field_mod_func = BN_nist_mod_224;
 150     else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
 151         group->field_mod_func = BN_nist_mod_256;
 152     else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 153         group->field_mod_func = BN_nist_mod_384;
 154     else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 155         group->field_mod_func = BN_nist_mod_521;
 156     else {
 157         ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
 158         goto err;
 159     }
 160
 161     ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 162
 163  err:
 164     BN_CTX_end(ctx);
 165     if (new_ctx != NULL)
 166         BN_CTX_free(new_ctx);
 167     return ret;
 168 }
 169
 170 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 171                           const BIGNUM *b, BN_CTX *ctx)
 172 {
 173     int ret = 0;
 174     BN_CTX *ctx_new = NULL;
 175
 176     if (!group || !r || !a || !b) {
 177         ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 178         goto err;
 179     }
 180     if (!ctx)
 181         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 182             goto err;
 183
 184     if (!BN_mul(r, a, b, ctx))
 185         goto err;
 186     if (!group->field_mod_func(r, r, &group->field, ctx))
 187         goto err;
 188
 189     ret = 1;
 190  err:
 191     if (ctx_new)
 192         BN_CTX_free(ctx_new);
 193     return ret;
 194 }
 195
 196 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 197                           BN_CTX *ctx)
 198 {
 199     int ret = 0;
 200     BN_CTX *ctx_new = NULL;
 201
 202     if (!group || !r || !a) {
 203         ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 204         goto err;
 205     }
 206     if (!ctx)
 207         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 208             goto err;
 209
 210     if (!BN_sqr(r, a, ctx))
 211         goto err;
 212     if (!group->field_mod_func(r, r, &group->field, ctx))
 213         goto err;
 214
 215     ret = 1;
 216  err:
 217     if (ctx_new)
 218         BN_CTX_free(ctx_new);
 219     return ret;
 220 }