ec_lcl.h

OpenSSL 0.9.8k 最新版OpenSSL

/* crypto/ec/ec_lcl.h */
/*
 * Originally written by Bodo Moeller for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 1998-2003 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
 *    [e-mail].
 *
 * 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
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */
/* ====================================================================
 * 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/obj_mac.h>
#include <openssl/ec.h>
#include <openssl/bn.h>

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

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

struct ec_method_st {
	/* 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_set_curve_GFp, EC_GROUP_get_curve_GFp, */
	/* EC_GROUP_set_curve_GF2m, and EC_GROUP_get_curve_GF2m: */
	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_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_GFp,
	 * EC_POINT_get_Jprojective_coordinates_GFp,
	 * EC_POINT_set_affine_coordinates_GFp,     ..._GF2m,
	 * EC_POINT_get_affine_coordinates_GFp,     ..._GF2m,
	 * EC_POINT_set_compressed_coordinates_GFp, ..._GF2m:
	 */
	int (*point_set_to_infinity)(const EC_GROUP *, EC_POINT *);
	int (*point_set_Jprojective_coordinates_GFp)(const EC_GROUP *, EC_POINT *,
		const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *);
	int (*point_get_Jprojective_coordinates_GFp)(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
	 * (default implementations are used if the 'mul' pointer is 0): */
	int (*mul)(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
		size_t num, const EC_POINT *points[], const BIGNUM *scalars[], 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 *);
} /* 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;