openssl/crypto/ec/ec_lcl.h

122 lines
4.7 KiB
C

/* TODO */
/* crypto/ec/ec_lcl.h */
/* ====================================================================
* 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).
*
*/
#include <stdlib.h>
#include <openssl/ec.h>
/* Structure details are not part of the exported interface,
* so all this may change in future versions. */
struct ec_method_st {
/* used by EC_GROUP_new, EC_GROUP_set_GFp, EC_GROUP_free: */
int (*group_init)(EC_GROUP *);
/* int (*group_set)(EC_GROUP *, .....); */
int (*group_set_GFp)(EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b);
void (*group_finish)(EC_GROUP *);
/* used by EC_POINT_new, EC_POINT_free: */
int (*point_init)(EC_POINT *);
void (*point_finish)(EC_POINT *);
/* used by EC_POINT_add, EC_POINT_dbl: */
int (*add)(const EC_GROUP *, EC_POINT *r, EC_POINT *a, EC_POINT *b);
int (*dbl)(const EC_GROUP *, EC_POINT *r, EC_POINT *a);
/* used by EC_POINT_add, EC_POINT_dbl: */
size_t (*point2oct)(const EC_GROUP *, EC_POINT *, unsigned char *buf,
size_t len, point_conversion_form_t form);
int (*oct2point)(const EC_GROUP *, EC_POINT *, unsigned char *buf, size_t len);
/* internal functions */
/* 'field_mult' and 'field_sqr' can be used by 'add' and 'dbl' so that
* the same implementations of point operations can be used with different
* implementations of field operations: */
int (*field_mult)(const EC_GROUP *, BIGNUM *r, BIGNUM *a, BIGNUM *b);
int (*field_sqr)(const EC_GROUP *, BIGNUM *r, BIGNUM *a);
} /* EC_METHOD */;
struct ec_group_st {
EC_METHOD *meth;
BIGNUM field; /* Field specification.
* For curves over GF(p), this is the modulus. */
void *field_data; /* method-specific (e.g., Montgomery structure) */
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).) */
int a_is_minus3; /* enable optimized point arithmetics for special case */
/* TODO: optional generator with associated information (order, cofactor) */
/* optional Lim/Lee precomputation table */
} /* EC_GROUP */;
struct ec_point_st {
EC_METHOD *meth;
BIGNUM x;
BIGNUM y;
BIGNUM z; /* Jacobian projective coordinates */
int z_is_one; /* enable optimized point arithmetics for special case */
} /* EC_POINT */;