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ecp_mont.c

/* crypto/ec/ecp_mont.c */
/*
 * Originally written by Bodo Moeller for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
 * and contributed to the OpenSSL project.
 */

#include <openssl/err.h>

#include "ec_lcl.h"


00069 const EC_METHOD *EC_GFp_mont_method(void)
      {
      static const EC_METHOD ret = {
            NID_X9_62_prime_field,
            ec_GFp_mont_group_init,
            ec_GFp_mont_group_finish,
            ec_GFp_mont_group_clear_finish,
            ec_GFp_mont_group_copy,
            ec_GFp_mont_group_set_curve,
            ec_GFp_simple_group_get_curve,
            ec_GFp_simple_group_get_degree,
            ec_GFp_simple_group_check_discriminant,
            ec_GFp_simple_point_init,
            ec_GFp_simple_point_finish,
            ec_GFp_simple_point_clear_finish,
            ec_GFp_simple_point_copy,
            ec_GFp_simple_point_set_to_infinity,
            ec_GFp_simple_set_Jprojective_coordinates_GFp,
            ec_GFp_simple_get_Jprojective_coordinates_GFp,
            ec_GFp_simple_point_set_affine_coordinates,
            ec_GFp_simple_point_get_affine_coordinates,
            ec_GFp_simple_set_compressed_coordinates,
            ec_GFp_simple_point2oct,
            ec_GFp_simple_oct2point,
            ec_GFp_simple_add,
            ec_GFp_simple_dbl,
            ec_GFp_simple_invert,
            ec_GFp_simple_is_at_infinity,
            ec_GFp_simple_is_on_curve,
            ec_GFp_simple_cmp,
            ec_GFp_simple_make_affine,
            ec_GFp_simple_points_make_affine,
            0 /* mul */,
            0 /* precompute_mult */,
            0 /* have_precompute_mult */, 
            ec_GFp_mont_field_mul,
            ec_GFp_mont_field_sqr,
            0 /* field_div */,
            ec_GFp_mont_field_encode,
            ec_GFp_mont_field_decode,
            ec_GFp_mont_field_set_to_one };

      return &ret;
      }


int ec_GFp_mont_group_init(EC_GROUP *group)
      {
      int ok;

      ok = ec_GFp_simple_group_init(group);
      group->field_data1 = NULL;
      group->field_data2 = NULL;
      return ok;
      }


void ec_GFp_mont_group_finish(EC_GROUP *group)
      {
      if (group->field_data1 != NULL)
            {
            BN_MONT_CTX_free(group->field_data1);
            group->field_data1 = NULL;
            }
      if (group->field_data2 != NULL)
            {
            BN_free(group->field_data2);
            group->field_data2 = NULL;
            }
      ec_GFp_simple_group_finish(group);
      }


void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
      {
      if (group->field_data1 != NULL)
            {
            BN_MONT_CTX_free(group->field_data1);
            group->field_data1 = NULL;
            }
      if (group->field_data2 != NULL)
            {
            BN_clear_free(group->field_data2);
            group->field_data2 = NULL;
            }
      ec_GFp_simple_group_clear_finish(group);
      }


int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
      {
      if (dest->field_data1 != NULL)
            {
            BN_MONT_CTX_free(dest->field_data1);
            dest->field_data1 = NULL;
            }
      if (dest->field_data2 != NULL)
            {
            BN_clear_free(dest->field_data2);
            dest->field_data2 = NULL;
            }

      if (!ec_GFp_simple_group_copy(dest, src)) return 0;

      if (src->field_data1 != NULL)
            {
            dest->field_data1 = BN_MONT_CTX_new();
            if (dest->field_data1 == NULL) return 0;
            if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
            }
      if (src->field_data2 != NULL)
            {
            dest->field_data2 = BN_dup(src->field_data2);
            if (dest->field_data2 == NULL) goto err;
            }

      return 1;

 err:
      if (dest->field_data1 != NULL)
            {
            BN_MONT_CTX_free(dest->field_data1);
            dest->field_data1 = NULL;
            }
      return 0;   
      }


int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
      {
      BN_CTX *new_ctx = NULL;
      BN_MONT_CTX *mont = NULL;
      BIGNUM *one = NULL;
      int ret = 0;

      if (group->field_data1 != NULL)
            {
            BN_MONT_CTX_free(group->field_data1);
            group->field_data1 = NULL;
            }
      if (group->field_data2 != NULL)
            {
            BN_free(group->field_data2);
            group->field_data2 = NULL;
            }
      
      if (ctx == NULL)
            {
            ctx = new_ctx = BN_CTX_new();
            if (ctx == NULL)
                  return 0;
            }

      mont = BN_MONT_CTX_new();
      if (mont == NULL) goto err;
      if (!BN_MONT_CTX_set(mont, p, ctx))
            {
            ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
            goto err;
            }
      one = BN_new();
      if (one == NULL) goto err;
      if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;

      group->field_data1 = mont;
      mont = NULL;
      group->field_data2 = one;
      one = NULL;

      ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);

      if (!ret)
            {
            BN_MONT_CTX_free(group->field_data1);
            group->field_data1 = NULL;
            BN_free(group->field_data2);
            group->field_data2 = NULL;
            }

 err:
      if (new_ctx != NULL)
            BN_CTX_free(new_ctx);
      if (mont != NULL)
            BN_MONT_CTX_free(mont);
      return ret;
      }


int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
      {
      if (group->field_data1 == NULL)
            {
            ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
            return 0;
            }

      return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
      }


int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
      {
      if (group->field_data1 == NULL)
            {
            ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
            return 0;
            }

      return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
      }


int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
      {
      if (group->field_data1 == NULL)
            {
            ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
            return 0;
            }

      return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
      }


int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
      {
      if (group->field_data1 == NULL)
            {
            ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
            return 0;
            }

      return BN_from_montgomery(r, a, group->field_data1, ctx);
      }


int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
      {
      if (group->field_data2 == NULL)
            {
            ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
            return 0;
            }

      if (!BN_copy(r, group->field_data2)) return 0;
      return 1;
      }

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