crypto/ec/ecp_nist.c

   1 /*
   2  * Written by Nils Larsch for the OpenSSL project.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    openssl-core@openssl.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57 /* ====================================================================
  58  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  59  * Portions of this software developed by SUN MICROSYSTEMS, INC.,
  60  * and contributed to the OpenSSL project.
  61  */
  62
  63 #include <limits.h>
  64
  65 #include <openssl/err.h>
  66 #include <openssl/obj_mac.h>
  67 #include "ec_lcl.h"
  68
  69 const EC_METHOD *EC_GFp_nist_method(void)
  70 {
  71     static const EC_METHOD ret = {
  72         EC_FLAGS_DEFAULT_OCT,
  73         NID_X9_62_prime_field,
  74         ec_GFp_simple_group_init,
  75         ec_GFp_simple_group_finish,
  76         ec_GFp_simple_group_clear_finish,
  77         ec_GFp_nist_group_copy,
  78         ec_GFp_nist_group_set_curve,
  79         ec_GFp_simple_group_get_curve,
  80         ec_GFp_simple_group_get_degree,
  81         ec_GFp_simple_group_check_discriminant,
  82         ec_GFp_simple_point_init,
  83         ec_GFp_simple_point_finish,
  84         ec_GFp_simple_point_clear_finish,
  85         ec_GFp_simple_point_copy,
  86         ec_GFp_simple_point_set_to_infinity,
  87         ec_GFp_simple_set_Jprojective_coordinates_GFp,
  88         ec_GFp_simple_get_Jprojective_coordinates_GFp,
  89         ec_GFp_simple_point_set_affine_coordinates,
  90         ec_GFp_simple_point_get_affine_coordinates,
  91         0, 0, 0,
  92         ec_GFp_simple_add,
  93         ec_GFp_simple_dbl,
  94         ec_GFp_simple_invert,
  95         ec_GFp_simple_is_at_infinity,
  96         ec_GFp_simple_is_on_curve,
  97         ec_GFp_simple_cmp,
  98         ec_GFp_simple_make_affine,
  99         ec_GFp_simple_points_make_affine,
 100         0 /* mul */ ,
 101         0 /* precompute_mult */ ,
 102         0 /* have_precompute_mult */ ,
 103         ec_GFp_nist_field_mul,
 104         ec_GFp_nist_field_sqr,
 105         0 /* field_div */ ,
 106         0 /* field_encode */ ,
 107         0 /* field_decode */ ,
 108         0                       /* field_set_to_one */
 109     };
 110
 111     return &ret;
 112 }
 113
 114 int 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 ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
 122                                 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 123 {
 124     int ret = 0;
 125     BN_CTX *new_ctx = NULL;
 126
 127     if (ctx == NULL)
 128         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
 129             return 0;
 130
 131     BN_CTX_start(ctx);
 132
 133     if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
 134         group->field_mod_func = BN_nist_mod_192;
 135     else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
 136         group->field_mod_func = BN_nist_mod_224;
 137     else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
 138         group->field_mod_func = BN_nist_mod_256;
 139     else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 140         group->field_mod_func = BN_nist_mod_384;
 141     else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 142         group->field_mod_func = BN_nist_mod_521;
 143     else {
 144         ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
 145         goto err;
 146     }
 147
 148     ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 149
 150  err:
 151     BN_CTX_end(ctx);
 152     BN_CTX_free(new_ctx);
 153     return ret;
 154 }
 155
 156 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 157                           const BIGNUM *b, BN_CTX *ctx)
 158 {
 159     int ret = 0;
 160     BN_CTX *ctx_new = NULL;
 161
 162     if (!group || !r || !a || !b) {
 163         ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 164         goto err;
 165     }
 166     if (!ctx)
 167         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 168             goto err;
 169
 170     if (!BN_mul(r, a, b, ctx))
 171         goto err;
 172     if (!group->field_mod_func(r, r, group->field, ctx))
 173         goto err;
 174
 175     ret = 1;
 176  err:
 177     BN_CTX_free(ctx_new);
 178     return ret;
 179 }
 180
 181 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 182                           BN_CTX *ctx)
 183 {
 184     int ret = 0;
 185     BN_CTX *ctx_new = NULL;
 186
 187     if (!group || !r || !a) {
 188         ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 189         goto err;
 190     }
 191     if (!ctx)
 192         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 193             goto err;
 194
 195     if (!BN_sqr(r, a, ctx))
 196         goto err;
 197     if (!group->field_mod_func(r, r, group->field, ctx))
 198         goto err;
 199
 200     ret = 1;
 201  err:
 202     BN_CTX_free(ctx_new);
 203     return ret;
 204 }