/* *********************************************************************

 *

 * Sun elects to have this file available under and governed by the

 * Mozilla Public License Version 1.1 ("MPL") (see

 * http://www.mozilla.org/MPL/ for full license text). For the avoidance

 * of doubt and subject to the following, Sun also elects to allow

 * licensees to use this file under the MPL, the GNU General Public

 * License version 2 only or the Lesser General Public License version

 * 2.1 only. Any references to the "GNU General Public License version 2

 * or later" or "GPL" in the following shall be construed to mean the

 * GNU General Public License version 2 only. Any references to the "GNU

 * Lesser General Public License version 2.1 or later" or "LGPL" in the

 * following shall be construed to mean the GNU Lesser General Public

 * License version 2.1 only. However, the following notice accompanied

 * the original version of this file:

 *

 * Version: MPL 1.1/GPL 2.0/LGPL 2.1

 *

 * The contents of this file are subject to the Mozilla Public License Version

 * 1.1 (the "License"); you may not use this file except in compliance with

 * the License. You may obtain a copy of the License at

 * http://www.mozilla.org/MPL/

 *

 * Software distributed under the License is distributed on an "AS IS" basis,

 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

 * for the specific language governing rights and limitations under the

 * License.

 *

 * The Original Code is the elliptic curve math library.

 *

 * The Initial Developer of the Original Code is

 * Sun Microsystems, Inc.

 * Portions created by the Initial Developer are Copyright (C) 2003

 * the Initial Developer. All Rights Reserved.

 *

 * Contributor(s):

 *   Douglas Stebila <douglas@stebila.ca>, Sun Microsystems Laboratories

 *

 * Alternatively, the contents of this file may be used under the terms of

 * either the GNU General Public License Version 2 or later (the "GPL"), or

 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

 * in which case the provisions of the GPL or the LGPL are applicable instead

 * of those above. If you wish to allow use of your version of this file only

 * under the terms of either the GPL or the LGPL, and not to allow others to

 * use your version of this file under the terms of the MPL, indicate your

 * decision by deleting the provisions above and replace them with the notice

 * and other provisions required by the GPL or the LGPL. If you do not delete

 * the provisions above, a recipient may use your version of this file under

 * the terms of any one of the MPL, the GPL or the LGPL.

 *

 *********************************************************************** */

/*

 * Use is subject to license terms.

 */

#include "mpi.h"

#include "mplogic.h"

#include "ecl.h"

#include "ecl-priv.h"

#include "ec2.h"

#include "ecp.h"

#ifndef _KERNEL

#include <stdlib.h>

#include <string.h>

#endif

/* Allocate memory for a new ECGroup object. */

ECGroup *

ECGroup_new(int kmflag)

{

        mp_err res = MP_OKAY;

        ECGroup *group;

#ifdef _KERNEL

        group = (ECGroup *) kmem_alloc(sizeof(ECGroup), kmflag);

#else

        group = (ECGroup *) malloc(sizeof(ECGroup));

#endif

        if (group == NULL)

                return NULL;

        group->constructed = MP_YES;

        group->meth = NULL;

        group->text = NULL;

        MP_DIGITS(&group->curvea) = 0;

        MP_DIGITS(&group->curveb) = 0;

        MP_DIGITS(&group->genx) = 0;

        MP_DIGITS(&group->geny) = 0;

        MP_DIGITS(&group->order) = 0;

        group->base_point_mul = NULL;

        group->points_mul = NULL;

        group->validate_point = NULL;

        group->extra1 = NULL;

        group->extra2 = NULL;

        group->extra_free = NULL;

        MP_CHECKOK(mp_init(&group->curvea, kmflag));

        MP_CHECKOK(mp_init(&group->curveb, kmflag));

        MP_CHECKOK(mp_init(&group->genx, kmflag));

        MP_CHECKOK(mp_init(&group->geny, kmflag));

        MP_CHECKOK(mp_init(&group->order, kmflag));

  CLEANUP:

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

/* Construct a generic ECGroup for elliptic curves over prime fields. */

ECGroup *

ECGroup_consGFp(const mp_int *irr, const mp_int *curvea,

                                const mp_int *curveb, const mp_int *genx,

                                const mp_int *geny, const mp_int *order, int cofactor)

{

        mp_err res = MP_OKAY;

        ECGroup *group = NULL;

        group = ECGroup_new(FLAG(irr));

        if (group == NULL)

                return NULL;

        group->meth = GFMethod_consGFp(irr);

        if (group->meth == NULL) {

                res = MP_MEM;

                goto CLEANUP;

        }

        MP_CHECKOK(mp_copy(curvea, &group->curvea));

        MP_CHECKOK(mp_copy(curveb, &group->curveb));

        MP_CHECKOK(mp_copy(genx, &group->genx));

        MP_CHECKOK(mp_copy(geny, &group->geny));

        MP_CHECKOK(mp_copy(order, &group->order));

        group->cofactor = cofactor;

        group->point_add = &ec_GFp_pt_add_aff;

        group->point_sub = &ec_GFp_pt_sub_aff;

        group->point_dbl = &ec_GFp_pt_dbl_aff;

        group->point_mul = &ec_GFp_pt_mul_jm_wNAF;

        group->base_point_mul = NULL;

        group->points_mul = &ec_GFp_pts_mul_jac;

        group->validate_point = &ec_GFp_validate_point;

  CLEANUP:

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

/* Construct a generic ECGroup for elliptic curves over prime fields with

 * field arithmetic implemented in Montgomery coordinates. */

ECGroup *

ECGroup_consGFp_mont(const mp_int *irr, const mp_int *curvea,

                                         const mp_int *curveb, const mp_int *genx,

                                         const mp_int *geny, const mp_int *order, int cofactor)

{

        mp_err res = MP_OKAY;

        ECGroup *group = NULL;

        group = ECGroup_new(FLAG(irr));

        if (group == NULL)

                return NULL;

        group->meth = GFMethod_consGFp_mont(irr);

        if (group->meth == NULL) {

                res = MP_MEM;

                goto CLEANUP;

        }

        MP_CHECKOK(group->meth->

                           field_enc(curvea, &group->curvea, group->meth));

        MP_CHECKOK(group->meth->

                           field_enc(curveb, &group->curveb, group->meth));

        MP_CHECKOK(group->meth->field_enc(genx, &group->genx, group->meth));

        MP_CHECKOK(group->meth->field_enc(geny, &group->geny, group->meth));

        MP_CHECKOK(mp_copy(order, &group->order));

        group->cofactor = cofactor;

        group->point_add = &ec_GFp_pt_add_aff;

        group->point_sub = &ec_GFp_pt_sub_aff;

        group->point_dbl = &ec_GFp_pt_dbl_aff;

        group->point_mul = &ec_GFp_pt_mul_jm_wNAF;

        group->base_point_mul = NULL;

        group->points_mul = &ec_GFp_pts_mul_jac;

        group->validate_point = &ec_GFp_validate_point;

  CLEANUP:

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

#ifdef NSS_ECC_MORE_THAN_SUITE_B

/* Construct a generic ECGroup for elliptic curves over binary polynomial

 * fields. */

ECGroup *

ECGroup_consGF2m(const mp_int *irr, const unsigned int irr_arr[5],

                                 const mp_int *curvea, const mp_int *curveb,

                                 const mp_int *genx, const mp_int *geny,

                                 const mp_int *order, int cofactor)

{

        mp_err res = MP_OKAY;

        ECGroup *group = NULL;

        group = ECGroup_new(FLAG(irr));

        if (group == NULL)

                return NULL;

        group->meth = GFMethod_consGF2m(irr, irr_arr);

        if (group->meth == NULL) {

                res = MP_MEM;

                goto CLEANUP;

        }

        MP_CHECKOK(mp_copy(curvea, &group->curvea));

        MP_CHECKOK(mp_copy(curveb, &group->curveb));

        MP_CHECKOK(mp_copy(genx, &group->genx));

        MP_CHECKOK(mp_copy(geny, &group->geny));

        MP_CHECKOK(mp_copy(order, &group->order));

        group->cofactor = cofactor;

        group->point_add = &ec_GF2m_pt_add_aff;

        group->point_sub = &ec_GF2m_pt_sub_aff;

        group->point_dbl = &ec_GF2m_pt_dbl_aff;

        group->point_mul = &ec_GF2m_pt_mul_mont;

        group->base_point_mul = NULL;

        group->points_mul = &ec_pts_mul_basic;

        group->validate_point = &ec_GF2m_validate_point;

  CLEANUP:

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

#endif

/* Construct ECGroup from hex parameters and name, if any. Called by

 * ECGroup_fromHex and ECGroup_fromName. */

ECGroup *

ecgroup_fromNameAndHex(const ECCurveName name,

                                   const ECCurveParams * params, int kmflag)

{

        mp_int irr, curvea, curveb, genx, geny, order;

        int bits;

        ECGroup *group = NULL;

        mp_err res = MP_OKAY;

        /* initialize values */

        MP_DIGITS(&irr) = 0;

        MP_DIGITS(&curvea) = 0;

        MP_DIGITS(&curveb) = 0;

        MP_DIGITS(&genx) = 0;

        MP_DIGITS(&geny) = 0;

        MP_DIGITS(&order) = 0;

        MP_CHECKOK(mp_init(&irr, kmflag));

        MP_CHECKOK(mp_init(&curvea, kmflag));

        MP_CHECKOK(mp_init(&curveb, kmflag));

        MP_CHECKOK(mp_init(&genx, kmflag));

        MP_CHECKOK(mp_init(&geny, kmflag));

        MP_CHECKOK(mp_init(&order, kmflag));

        MP_CHECKOK(mp_read_radix(&irr, params->irr, 16));

        MP_CHECKOK(mp_read_radix(&curvea, params->curvea, 16));

        MP_CHECKOK(mp_read_radix(&curveb, params->curveb, 16));

        MP_CHECKOK(mp_read_radix(&genx, params->genx, 16));

        MP_CHECKOK(mp_read_radix(&geny, params->geny, 16));

        MP_CHECKOK(mp_read_radix(&order, params->order, 16));

        /* determine number of bits */

        bits = mpl_significant_bits(&irr) - 1;

        if (bits < MP_OKAY) {

                res = bits;

                goto CLEANUP;

        }

        /* determine which optimizations (if any) to use */

        if (params->field == ECField_GFp) {

#ifdef NSS_ECC_MORE_THAN_SUITE_B

            switch (name) {

#ifdef ECL_USE_FP

                case ECCurve_SECG_PRIME_160R1:

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_secp160r1_fp(group));

                        break;

#endif

                case ECCurve_SECG_PRIME_192R1:

#ifdef ECL_USE_FP

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_nistp192_fp(group));

#else

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_gfp192(group, name));

#endif

                        break;

                case ECCurve_SECG_PRIME_224R1:

#ifdef ECL_USE_FP

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_nistp224_fp(group));

#else

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_gfp224(group, name));

#endif

                        break;

                case ECCurve_SECG_PRIME_256R1:

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_gfp256(group, name));

                        break;

                case ECCurve_SECG_PRIME_521R1:

                        group =

                                ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,

                                                                &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                        MP_CHECKOK(ec_group_set_gfp521(group, name));

                        break;

                default:

                        /* use generic arithmetic */

#endif

                        group =

                                ECGroup_consGFp_mont(&irr, &curvea, &curveb, &genx, &geny,

                                                                         &order, params->cofactor);

                        if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

#ifdef NSS_ECC_MORE_THAN_SUITE_B

                }

        } else if (params->field == ECField_GF2m) {

                group = ECGroup_consGF2m(&irr, NULL, &curvea, &curveb, &genx, &geny, &order, params->cofactor);

                if (group == NULL) { res = MP_UNDEF; goto CLEANUP; }

                if ((name == ECCurve_NIST_K163) ||

                    (name == ECCurve_NIST_B163) ||

                    (name == ECCurve_SECG_CHAR2_163R1)) {

                        MP_CHECKOK(ec_group_set_gf2m163(group, name));

                } else if ((name == ECCurve_SECG_CHAR2_193R1) ||

                           (name == ECCurve_SECG_CHAR2_193R2)) {

                        MP_CHECKOK(ec_group_set_gf2m193(group, name));

                } else if ((name == ECCurve_NIST_K233) ||

                           (name == ECCurve_NIST_B233)) {

                        MP_CHECKOK(ec_group_set_gf2m233(group, name));

                }

#endif

        } else {

                res = MP_UNDEF;

                goto CLEANUP;

        }

        /* set name, if any */

        if ((group != NULL) && (params->text != NULL)) {

#ifdef _KERNEL

                int n = strlen(params->text) + 1;

                group->text = kmem_alloc(n, kmflag);

                if (group->text == NULL) {

                        res = MP_MEM;

                        goto CLEANUP;

                }

                bcopy(params->text, group->text, n);

                group->text_len = n;

#else

                group->text = strdup(params->text);

                if (group->text == NULL) {

                        res = MP_MEM;

                }

#endif

        }

  CLEANUP:

        mp_clear(&irr);

        mp_clear(&curvea);

        mp_clear(&curveb);

        mp_clear(&genx);

        mp_clear(&geny);

        mp_clear(&order);

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

/* Construct ECGroup from hexadecimal representations of parameters. */

ECGroup *

ECGroup_fromHex(const ECCurveParams * params, int kmflag)

{

        return ecgroup_fromNameAndHex(ECCurve_noName, params, kmflag);

}

/* Construct ECGroup from named parameters. */

ECGroup *

ECGroup_fromName(const ECCurveName name, int kmflag)

{

        ECGroup *group = NULL;

        ECCurveParams *params = NULL;

        mp_err res = MP_OKAY;

        params = EC_GetNamedCurveParams(name, kmflag);

        if (params == NULL) {

                res = MP_UNDEF;

                goto CLEANUP;

        }

        /* construct actual group */

        group = ecgroup_fromNameAndHex(name, params, kmflag);

        if (group == NULL) {

                res = MP_UNDEF;

                goto CLEANUP;

        }

  CLEANUP:

        EC_FreeCurveParams(params);

        if (res != MP_OKAY) {

                ECGroup_free(group);

                return NULL;

        }

        return group;

}

/* Validates an EC public key as described in Section 5.2.2 of X9.62. */

mp_err ECPoint_validate(const ECGroup *group, const mp_int *px, const

                                        mp_int *py)

{

    /* 1: Verify that publicValue is not the point at infinity */

    /* 2: Verify that the coordinates of publicValue are elements

     *    of the field.

     */

    /* 3: Verify that publicValue is on the curve. */

    /* 4: Verify that the order of the curve times the publicValue

     *    is the point at infinity.

     */

        return group->validate_point(px, py, group);

}

/* Free the memory allocated (if any) to an ECGroup object. */

void

ECGroup_free(ECGroup *group)

{

        if (group == NULL)

                return;

        GFMethod_free(group->meth);

        if (group->constructed == MP_NO)

                return;

        mp_clear(&group->curvea);

        mp_clear(&group->curveb);

        mp_clear(&group->genx);

        mp_clear(&group->geny);

        mp_clear(&group->order);

        if (group->text != NULL)

#ifdef _KERNEL

                kmem_free(group->text, group->text_len);

#else

                free(group->text);

#endif

        if (group->extra_free != NULL)

                group->extra_free(group);

#ifdef _KERNEL

        kmem_free(group, sizeof (ECGroup));

#else

        free(group);

#endif

}