177 lines
7.2 KiB
C
177 lines
7.2 KiB
C
/* TODO */
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/* crypto/ec/ec_lcl.h */
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/* ====================================================================
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* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdlib.h>
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#include <openssl/ec.h>
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/* Structure details are not part of the exported interface,
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* so all this may change in future versions. */
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struct ec_method_st {
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/* used by EC_GROUP_new, EC_GROUP_set_curve_GFp, EC_GROUP_free, EC_GROUP_copy: */
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int (*group_init)(EC_GROUP *);
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/* int (*group_set)(EC_GROUP *, .....); */
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int (*group_set_curve_GFp)(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
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void (*group_finish)(EC_GROUP *);
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void (*group_clear_finish)(EC_GROUP *);
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int (*group_copy)(EC_GROUP *, const EC_GROUP *);
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/* used by EC_GROUP_set_generator: */
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int (*group_set_generator)(EC_GROUP *, const EC_POINT *generator,
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const BIGNUM *order, const BIGNUM *cofactor);
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/* TODO: 'set' functions for EC_GROUPs */
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/* used by EC_POINT_new, EC_POINT_free, EC_POINT_copy: */
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int (*point_init)(EC_POINT *);
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void (*point_finish)(EC_POINT *);
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void (*point_clear_finish)(EC_POINT *);
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int (*point_copy)(EC_POINT *, const EC_POINT *);
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/* TODO: 'set' and 'get' functions for EC_POINTs */
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/* used by EC_POINT_point2oct, EC_POINT_oct2point: */
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size_t (*point2oct)(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
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unsigned char *buf, size_t len, BN_CTX *);
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int (*oct2point)(const EC_GROUP *, EC_POINT *,
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const unsigned char *buf, size_t len, BN_CTX *);
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/* used by EC_POINT_add, EC_POINT_dbl: */
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int (*add)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
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int (*dbl)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
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/* used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_make_affine */
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int (*is_at_infinity)(const EC_GROUP *, const EC_POINT *);
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int (*is_on_curve)(const EC_GROUP *, const EC_POINT *, BN_CTX *);
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int (*make_affine)(const EC_GROUP *, const EC_POINT *, BN_CTX *);
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/* internal functions */
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/* 'field_mult' and 'field_sqr' can be used by 'add' and 'dbl' so that
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* the same implementations of point operations can be used with different
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* optimized implementations of expensive field operations: */
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int (*field_mult)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
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int (*field_sqr)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
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int (*field_encode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. to Montgomery */
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int (*field_decode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. from Montgomery */
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} /* EC_METHOD */;
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struct ec_group_st {
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const EC_METHOD *meth;
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void *extra_data;
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void *(*extra_data_dup_func)(void *);
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void (*extra_data_free_func)(void *);
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void (*extra_data_clear_free_func)(void *);
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/* All members except 'meth' and 'extra_data...' are handled by
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* the method functions, even if they appear generic */
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BIGNUM field; /* Field specification.
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* For curves over GF(p), this is the modulus. */
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void *field_data; /* method-specific (e.g., Montgomery structure) */
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BIGNUM a, b; /* Curve coefficients.
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* (Here the assumption is that BIGNUMs can be used
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* or abused for all kinds of fields, not just GF(p).)
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* For characteristic > 3, the curve is defined
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* by a Weierstrass equation of the form
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* Y^2 = X^3 + a*X + b.
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*/
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int a_is_minus3; /* enable optimized point arithmetics for special case */
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EC_POINT *generator; /* optional */
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BIGNUM order, cofactor;
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/* optional Lim/Lee precomputation table */
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} /* EC_GROUP */;
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/* Basically a 'mixin' for extra data, but available for EC_GROUPs only
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* (with visibility limited to 'package' level for now).
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* We use the function pointers as index for retrieval; this obviates
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* global ex_data-style index tables.
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* (Currently, we have one slot only, but is is possible to extend this
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* if necessary.) */
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int EC_GROUP_set_extra_data(EC_GROUP *, void *extra_data, void *(*extra_data_dup_func)(void *),
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void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *));
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void *EC_GROUP_get_extra_data(EC_GROUP *, void *(*extra_data_dup_func)(void *),
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void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *));
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void EC_GROUP_free_extra_data(EC_GROUP *);
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void EC_GROUP_clear_free_extra_data(EC_GROUP *);
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struct ec_point_st {
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const EC_METHOD *meth;
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/* All members except 'meth' are handled by the method functions,
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* even if they appear generic */
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BIGNUM X;
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BIGNUM Y;
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BIGNUM Z; /* Jacobian projective coordinates:
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* (X, Y, Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
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int Z_is_one; /* enable optimized point arithmetics for special case */
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} /* EC_POINT */;
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