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 const EC_METHOD *EC_GFp_nist_method(void)
  71         {
  72         static const EC_METHOD ret = {
  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                 ec_GFp_simple_set_compressed_coordinates,
  92                 ec_GFp_simple_point2oct,
  93                 ec_GFp_simple_oct2point,
  94                 ec_GFp_simple_add,
  95                 ec_GFp_simple_dbl,
  96                 ec_GFp_simple_invert,
  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                 0 /* mul */,
 103                 0 /* precompute_mult */,
 104                 0 /* have_precompute_mult */,
 105                 ec_GFp_nist_field_mul,
 106                 ec_GFp_nist_field_sqr,
 107                 0 /* field_div */,
 108                 0 /* field_encode */,
 109                 0 /* field_decode */,
 110                 0 /* field_set_to_one */ };
 111
 112         return &ret;
 113         }
 114
 115 #if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL
 116 #define NO_32_BIT_TYPE
 117 #endif
 118
 119 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
 120         {
 121         dest->field_mod_func = src->field_mod_func;
 122
 123         return ec_GFp_simple_group_copy(dest, src);
 124         }
 125
 126 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
 127         const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 128         {
 129         int ret = 0;
 130         BN_CTX *new_ctx = NULL;
 131         BIGNUM *tmp_bn;
 132
 133         if (ctx == NULL)
 134                 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
 135
 136         BN_CTX_start(ctx);
 137         if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err;
 138
 139         if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
 140                 group->field_mod_func = BN_nist_mod_192;
 141         else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
 142                 {
 143 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 144                 group->field_mod_func = BN_nist_mod_224;
 145 #else
 146                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 147                 goto err;
 148 #endif
 149                 }
 150         else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
 151                 {
 152 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 153                 group->field_mod_func = BN_nist_mod_256;
 154 #else
 155                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 156                 goto err;
 157 #endif
 158                 }
 159         else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 160                 {
 161 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
 162                 group->field_mod_func = BN_nist_mod_384;
 163 #else
 164                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
 165                 goto err;
 166 #endif
 167                 }
 168         else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 169                 /* this one works in the NO_32_BIT_TYPE case */
 170                 group->field_mod_func = BN_nist_mod_521;
 171         else
 172                 {
 173                 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
 174                 goto err;
 175                 }
 176
 177         ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 178
 179  err:
 180         BN_CTX_end(ctx);
 181         if (new_ctx != NULL)
 182                 BN_CTX_free(new_ctx);
 183         return ret;
 184         }
 185
 186
 187 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 188         const BIGNUM *b, BN_CTX *ctx)
 189         {
 190         int     ret=0;
 191         BN_CTX  *ctx_new=NULL;
 192
 193         if (!group || !r || !a || !b)
 194                 {
 195                 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 196                 goto err;
 197                 }
 198         if (!ctx)
 199                 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
 200
 201         if (!BN_mul(r, a, b, ctx)) goto err;
 202         if (!group->field_mod_func(r, r, &group->field, ctx))
 203                 goto err;
 204
 205         ret=1;
 206 err:
 207         if (ctx_new)
 208                 BN_CTX_free(ctx_new);
 209         return ret;
 210         }
 211
 212
 213 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 214         BN_CTX *ctx)
 215         {
 216         int     ret=0;
 217         BN_CTX  *ctx_new=NULL;
 218
 219         if (!group || !r || !a)
 220                 {
 221                 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 222                 goto err;
 223                 }
 224         if (!ctx)
 225                 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
 226
 227         if (!BN_sqr(r, a, ctx)) goto err;
 228         if (!group->field_mod_func(r, r, &group->field, ctx))
 229                 goto err;
 230
 231         ret=1;
 232 err:
 233         if (ctx_new)
 234                 BN_CTX_free(ctx_new);
 235         return ret;
 236         }