/* $OpenBSD: ec_lcl.h,v 1.20 2022/06/30 11:14:47 tb Exp $ */
/*
 * Originally written by Bodo Moeller for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 1998-2010 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 the attached software ("Contribution") are developed by 
 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 *
 * The Contribution is licensed pursuant to the OpenSSL open source
 * license provided above.
 *
 * The elliptic curve binary polynomial software is originally written by 
 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
 *
 */

#include <stdlib.h>

#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/objects.h>

#include "bn_lcl.h"

__BEGIN_HIDDEN_DECLS

#if defined(__SUNPRO_C)
# if __SUNPRO_C >= 0x520
# pragma error_messages (off,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
# endif
#endif

#define bn_wexpand(a,words) (((words) <= (a)->dmax)?(a):bn_expand2((a),(words)))
BIGNUM *bn_expand2(BIGNUM *a, int words);

/* Use default functions for poin2oct, oct2point and compressed coordinates */
#define EC_FLAGS_DEFAULT_OCT    0x1

/* Structure details are not part of the exported interface,
 * so all this may change in future versions. */

struct ec_method_st {
        /* Various method flags */
        int flags;
        /* used by EC_METHOD_get_field_type: */
        int field_type; /* a NID */

        /* used by EC_GROUP_new, EC_GROUP_free, EC_GROUP_clear_free, EC_GROUP_copy: */
        int (*group_init)(EC_GROUP *);
        void (*group_finish)(EC_GROUP *);
        void (*group_clear_finish)(EC_GROUP *);
        int (*group_copy)(EC_GROUP *, const EC_GROUP *);

        /* used by EC_GROUP_{get,set}_curve */
        int (*group_set_curve)(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
        int (*group_get_curve)(const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *);

        /* used by EC_GROUP_get_degree: */
        int (*group_get_degree)(const EC_GROUP *);
        /* used by EC_GROUP_order_bits: */
        int (*group_order_bits)(const EC_GROUP *);
        /* used by EC_GROUP_check: */
        int (*group_check_discriminant)(const EC_GROUP *, BN_CTX *);

        /* used by EC_POINT_new, EC_POINT_free, EC_POINT_clear_free, EC_POINT_copy: */
        int (*point_init)(EC_POINT *);
        void (*point_finish)(EC_POINT *);
        void (*point_clear_finish)(EC_POINT *);
        int (*point_copy)(EC_POINT *, const EC_POINT *);

        /*
         * used by EC_POINT_set_to_infinity,
         * EC_POINT_set_Jprojective_coordinates,
         * EC_POINT_get_Jprojective_coordinates,
         * EC_POINT_set_affine_coordinates,
         * EC_POINT_get_affine_coordinates,
         * EC_POINT_set_compressed_coordinates:
         */
        int (*point_set_to_infinity)(const EC_GROUP *, EC_POINT *);
        int (*point_set_Jprojective_coordinates)(const EC_GROUP *, EC_POINT *,
                const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *);
        int (*point_get_Jprojective_coordinates)(const EC_GROUP *, const EC_POINT *,
                BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *);
        int (*point_set_affine_coordinates)(const EC_GROUP *, EC_POINT *,
                const BIGNUM *x, const BIGNUM *y, BN_CTX *);
        int (*point_get_affine_coordinates)(const EC_GROUP *, const EC_POINT *,
                BIGNUM *x, BIGNUM *y, BN_CTX *);
        int (*point_set_compressed_coordinates)(const EC_GROUP *, EC_POINT *,
                const BIGNUM *x, int y_bit, BN_CTX *);

        /* used by EC_POINT_point2oct, EC_POINT_oct2point: */
        size_t (*point2oct)(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
                unsigned char *buf, size_t len, BN_CTX *);
        int (*oct2point)(const EC_GROUP *, EC_POINT *,
                const unsigned char *buf, size_t len, BN_CTX *);

        /* used by EC_POINT_add, EC_POINT_dbl, ECP_POINT_invert: */
        int (*add)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
        int (*dbl)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
        int (*invert)(const EC_GROUP *, EC_POINT *, BN_CTX *);

        /* used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_cmp: */
        int (*is_at_infinity)(const EC_GROUP *, const EC_POINT *);
        int (*is_on_curve)(const EC_GROUP *, const EC_POINT *, BN_CTX *);
        int (*point_cmp)(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b, BN_CTX *);

        /* used by EC_POINT_make_affine, EC_POINTs_make_affine: */
        int (*make_affine)(const EC_GROUP *, EC_POINT *, BN_CTX *);
        int (*points_make_affine)(const EC_GROUP *, size_t num, EC_POINT *[], BN_CTX *);

        /* used by EC_POINTs_mul, EC_POINT_mul, EC_POINT_precompute_mult, EC_POINT_have_precompute_mult */
        int (*mul_generator_ct)(const EC_GROUP *, EC_POINT *r, const BIGNUM *scalar, BN_CTX *);
        int (*mul_single_ct)(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
                const EC_POINT *point, BN_CTX *);
        int (*mul_double_nonct)(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
                const BIGNUM *p_scalar, const EC_POINT *point, BN_CTX *);
        int (*precompute_mult)(EC_GROUP *group, BN_CTX *);
        int (*have_precompute_mult)(const EC_GROUP *group);


        /* internal functions */

        /* 'field_mul', 'field_sqr', and 'field_div' can be used by 'add' and 'dbl' so that
         * the same implementations of point operations can be used with different
         * optimized implementations of expensive field operations: */
        int (*field_mul)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
        int (*field_sqr)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
        int (*field_div)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);

        int (*field_encode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. to Montgomery */
        int (*field_decode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. from Montgomery */
        int (*field_set_to_one)(const EC_GROUP *, BIGNUM *r, BN_CTX *);
        int (*blind_coordinates)(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx);
} /* EC_METHOD */;

typedef struct ec_extra_data_st {
        struct ec_extra_data_st *next;
        void *data;
        void *(*dup_func)(void *);
        void (*free_func)(void *);
        void (*clear_free_func)(void *);
} EC_EXTRA_DATA; /* used in EC_GROUP */

struct ec_group_st {
        const EC_METHOD *meth;

        EC_POINT *generator; /* optional */
        BIGNUM order, cofactor;

        int curve_name;/* optional NID for named curve */
        int asn1_flag; /* flag to control the asn1 encoding */
        point_conversion_form_t asn1_form;

        unsigned char *seed; /* optional seed for parameters (appears in ASN1) */
        size_t seed_len;

        EC_EXTRA_DATA *extra_data; /* linked list */

        /* The following members are handled by the method functions,
         * even if they appear generic */
        
        BIGNUM field; /* Field specification.
                       * For curves over GF(p), this is the modulus;
                       * for curves over GF(2^m), this is the 
                       * irreducible polynomial defining the field.
                       */

        int poly[6]; /* Field specification for curves over GF(2^m).
                      * The irreducible f(t) is then of the form:
                      *     t^poly[0] + t^poly[1] + ... + t^poly[k]
                      * where m = poly[0] > poly[1] > ... > poly[k] = 0.
                      * The array is terminated with poly[k+1]=-1.
                      * All elliptic curve irreducibles have at most 5
                      * non-zero terms.
                      */

        BIGNUM a, b; /* Curve coefficients.
                      * (Here the assumption is that BIGNUMs can be used
                      * or abused for all kinds of fields, not just GF(p).)
                      * For characteristic  > 3,  the curve is defined
                      * by a Weierstrass equation of the form
                      *     y^2 = x^3 + a*x + b.
                      * For characteristic  2,  the curve is defined by
                      * an equation of the form
                      *     y^2 + x*y = x^3 + a*x^2 + b.
                      */

        int a_is_minus3; /* enable optimized point arithmetics for special case */

        void *field_data1; /* method-specific (e.g., Montgomery structure) */
        void *field_data2; /* method-specific */
        int (*field_mod_func)(BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *); /* method-specific */
} /* EC_GROUP */;

struct ec_key_st {
        const EC_KEY_METHOD *meth;
        ENGINE  *engine;

        int version;

        EC_GROUP *group;

        EC_POINT *pub_key;
        BIGNUM   *priv_key;

        unsigned int enc_flag;
        point_conversion_form_t conv_form;

        int     references;
        int     flags;

        EC_EXTRA_DATA *method_data;
        CRYPTO_EX_DATA ex_data;
} /* EC_KEY */;

/* Basically a 'mixin' for extra data, but available for EC_GROUPs/EC_KEYs only
 * (with visibility limited to 'package' level for now).
 * We use the function pointers as index for retrieval; this obviates
 * global ex_data-style index tables.
 */
int EC_EX_DATA_set_data(EC_EXTRA_DATA **, void *data,
        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *,
        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
void EC_EX_DATA_free_data(EC_EXTRA_DATA **,
        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **,
        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **);
void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **);

int ec_group_simple_order_bits(const EC_GROUP *group);

struct ec_point_st {
        const EC_METHOD *meth;

        /* All members except 'meth' are handled by the method functions,
         * even if they appear generic */

        BIGNUM X;
        BIGNUM Y;
        BIGNUM Z; /* Jacobian projective coordinates:
                   * (X, Y, Z)  represents  (X/Z^2, Y/Z^3)  if  Z != 0 */
        int Z_is_one; /* enable optimized point arithmetics for special case */
} /* EC_POINT */;

/* method functions in ec_mult.c
 * (ec_lib.c uses these as defaults if group->method->mul is 0) */
int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
        size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *);
int ec_wNAF_have_precompute_mult(const EC_GROUP *group);


/* method functions in ecp_smpl.c */
int ec_GFp_simple_group_init(EC_GROUP *);
void ec_GFp_simple_group_finish(EC_GROUP *);
void ec_GFp_simple_group_clear_finish(EC_GROUP *);
int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GFp_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *);
int ec_GFp_simple_group_get_degree(const EC_GROUP *);
int ec_GFp_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
int ec_GFp_simple_point_init(EC_POINT *);
void ec_GFp_simple_point_finish(EC_POINT *);
void ec_GFp_simple_point_clear_finish(EC_POINT *);
int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
int ec_GFp_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
int ec_GFp_simple_set_Jprojective_coordinates(const EC_GROUP *, EC_POINT *,
    const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *);
int ec_GFp_simple_get_Jprojective_coordinates(const EC_GROUP *,
    const EC_POINT *, BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *);
int ec_GFp_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
        const BIGNUM *x, const BIGNUM *y, BN_CTX *);
int ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP *, const EC_POINT *,
        BIGNUM *x, BIGNUM *y, BN_CTX *);
int ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
        const BIGNUM *x, int y_bit, BN_CTX *);
size_t ec_GFp_simple_point2oct(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
        unsigned char *buf, size_t len, BN_CTX *);
int ec_GFp_simple_oct2point(const EC_GROUP *, EC_POINT *,
        const unsigned char *buf, size_t len, BN_CTX *);
int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
int ec_GFp_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
int ec_GFp_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int ec_GFp_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
int ec_GFp_simple_points_make_affine(const EC_GROUP *, size_t num, EC_POINT *[], BN_CTX *);
int ec_GFp_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int ec_GFp_simple_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx);
int ec_GFp_simple_mul_generator_ct(const EC_GROUP *, EC_POINT *r, const BIGNUM *scalar, BN_CTX *);
int ec_GFp_simple_mul_single_ct(const EC_GROUP *, EC_POINT *r, const BIGNUM *scalar,
        const EC_POINT *point, BN_CTX *);
int ec_GFp_simple_mul_double_nonct(const EC_GROUP *, EC_POINT *r, const BIGNUM *g_scalar,
        const BIGNUM *p_scalar, const EC_POINT *point, BN_CTX *);


/* method functions in ecp_mont.c */
int ec_GFp_mont_group_init(EC_GROUP *);
int ec_GFp_mont_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
void ec_GFp_mont_group_finish(EC_GROUP *);
void ec_GFp_mont_group_clear_finish(EC_GROUP *);
int ec_GFp_mont_group_copy(EC_GROUP *, const EC_GROUP *);
int ec_GFp_mont_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int ec_GFp_mont_field_set_to_one(const EC_GROUP *, BIGNUM *r, BN_CTX *);

int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx);

/* method functions in ecp_nist.c */
int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src);
int ec_GFp_nist_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GFp_nist_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GFp_nist_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);


/* method functions in ec2_smpl.c */
int ec_GF2m_simple_group_init(EC_GROUP *);
void ec_GF2m_simple_group_finish(EC_GROUP *);
void ec_GF2m_simple_group_clear_finish(EC_GROUP *);
int ec_GF2m_simple_group_copy(EC_GROUP *, const EC_GROUP *);
int ec_GF2m_simple_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GF2m_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *);
int ec_GF2m_simple_group_get_degree(const EC_GROUP *);
int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
int ec_GF2m_simple_point_init(EC_POINT *);
void ec_GF2m_simple_point_finish(EC_POINT *);
void ec_GF2m_simple_point_clear_finish(EC_POINT *);
int ec_GF2m_simple_point_copy(EC_POINT *, const EC_POINT *);
int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
        const BIGNUM *x, const BIGNUM *y, BN_CTX *);
int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *, const EC_POINT *,
        BIGNUM *x, BIGNUM *y, BN_CTX *);
int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
        const BIGNUM *x, int y_bit, BN_CTX *);
size_t ec_GF2m_simple_point2oct(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
        unsigned char *buf, size_t len, BN_CTX *);
int ec_GF2m_simple_oct2point(const EC_GROUP *, EC_POINT *,
        const unsigned char *buf, size_t len, BN_CTX *);
int ec_GF2m_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int ec_GF2m_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
int ec_GF2m_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
int ec_GF2m_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
int ec_GF2m_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
int ec_GF2m_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int ec_GF2m_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
int ec_GF2m_simple_points_make_affine(const EC_GROUP *, size_t num, EC_POINT *[], BN_CTX *);
int ec_GF2m_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int ec_GF2m_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int ec_GF2m_simple_field_div(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);


/* method functions in ec2_mult.c */
int ec_GF2m_simple_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
        size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_GF2m_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
int ec_GF2m_have_precompute_mult(const EC_GROUP *group);

/* method functions in ec2_mult.c */
int ec_GF2m_simple_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
        size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_GF2m_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
int ec_GF2m_have_precompute_mult(const EC_GROUP *group);

#ifndef OPENSSL_EC_NISTP_64_GCC_128
/* method functions in ecp_nistp224.c */
int ec_GFp_nistp224_group_init(EC_GROUP *group);
int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *n, BN_CTX *);
int ec_GFp_nistp224_point_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *point, BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int ec_GFp_nistp224_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx);
int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
int ec_GFp_nistp224_have_precompute_mult(const EC_GROUP *group);

/* method functions in ecp_nistp256.c */
int ec_GFp_nistp256_group_init(EC_GROUP *group);
int ec_GFp_nistp256_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *n, BN_CTX *);
int ec_GFp_nistp256_point_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *point, BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int ec_GFp_nistp256_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_GFp_nistp256_points_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx);
int ec_GFp_nistp256_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
int ec_GFp_nistp256_have_precompute_mult(const EC_GROUP *group);

#ifdef ECP_NISTZ256_ASM
const EC_METHOD *EC_GFp_nistz256_method(void);
#endif

/* EC_METHOD definitions */

struct ec_key_method_st {
        const char *name;
        int32_t flags;
        int (*init)(EC_KEY *key);
        void (*finish)(EC_KEY *key);
        int (*copy)(EC_KEY *dest, const EC_KEY *src);
        int (*set_group)(EC_KEY *key, const EC_GROUP *grp);
        int (*set_private)(EC_KEY *key, const BIGNUM *priv_key);
        int (*set_public)(EC_KEY *key, const EC_POINT *pub_key);
        int (*keygen)(EC_KEY *key);
        int (*compute_key)(void *out, size_t outlen, const EC_POINT *pub_key, EC_KEY *ecdh,
            void *(*KDF) (const void *in, size_t inlen, void *out, size_t *outlen));
        int (*sign)(int type, const unsigned char *dgst, int dlen, unsigned char
            *sig, unsigned int *siglen, const BIGNUM *kinv,
            const BIGNUM *r, EC_KEY *eckey);
        int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
            BIGNUM **rp);
        ECDSA_SIG *(*sign_sig)(const unsigned char *dgst, int dgst_len,
            const BIGNUM *in_kinv, const BIGNUM *in_r,
            EC_KEY *eckey);
        int (*verify)(int type, const unsigned char *dgst, int dgst_len,
            const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
        int (*verify_sig)(const unsigned char *dgst, int dgst_len,
            const ECDSA_SIG *sig, EC_KEY *eckey);
} /* EC_KEY_METHOD */;

#define EC_KEY_METHOD_DYNAMIC   1

int ossl_ec_key_gen(EC_KEY *eckey);
int ossl_ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, EC_KEY *ecdh,
    void *(*KDF) (const void *in, size_t inlen, void *out, size_t *outlen));
int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
    const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
    const ECDSA_SIG *sig, EC_KEY *eckey);

/* method functions in ecp_nistp521.c */
int ec_GFp_nistp521_group_init(EC_GROUP *group);
int ec_GFp_nistp521_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *n, BN_CTX *);
int ec_GFp_nistp521_point_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *point, BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int ec_GFp_nistp521_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *);
int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx);
int ec_GFp_nistp521_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
int ec_GFp_nistp521_have_precompute_mult(const EC_GROUP *group);

/* utility functions in ecp_nistputil.c */
void ec_GFp_nistp_points_make_affine_internal(size_t num, void *point_array,
        size_t felem_size, void *tmp_felems,
        void (*felem_one)(void *out),
        int (*felem_is_zero)(const void *in),
        void (*felem_assign)(void *out, const void *in),
        void (*felem_square)(void *out, const void *in),
        void (*felem_mul)(void *out, const void *in1, const void *in2),
        void (*felem_inv)(void *out, const void *in),
        void (*felem_contract)(void *out, const void *in));
void ec_GFp_nistp_recode_scalar_bits(unsigned char *sign, unsigned char *digit, unsigned char in);

#endif

__END_HIDDEN_DECLS