2f6410ba4e
Functions which lose object reuse and need auditing: - d2i_ECParameters - d2i_ECPrivateKey This adds a handful of bytestring-based APIs to handle EC key serialization. Deprecate all the old serialization APIs. Notes: - An EC_KEY has additional state that controls its encoding, enc_flags and conv_form. conv_form is left alone, but enc_flags in the new API is an explicit parameter. - d2i_ECPrivateKey interpreted its T** argument unlike nearly every other d2i function. This is an explicit EC_GROUP parameter in the new function. - The new specified curve code is much stricter and should parse enough to uniquely identify the curve. - I've not bothered with a new version of i2d_ECParameters. It just writes an OID. This may change later when decoupling from the giant OID table. - Likewise, I've not bothered with new APIs for the public key since the EC_POINT APIs should suffice. - Previously, d2i_ECPrivateKey would not call EC_KEY_check_key and it was possible for the imported public and private key to mismatch. It now calls it. BUG=499653 Change-Id: I30b4dd2841ae76c56ab0e1808360b2628dee0615 Reviewed-on: https://boringssl-review.googlesource.com/6859 Reviewed-by: Adam Langley <agl@google.com>
302 lines
13 KiB
C
302 lines
13 KiB
C
/* Originally written by Bodo Moeller for the OpenSSL project.
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* ====================================================================
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* Copyright (c) 1998-2005 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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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* Portions of the attached software ("Contribution") are developed by
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
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* license provided above.
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*
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* The elliptic curve binary polynomial software is originally written by
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* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
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* Laboratories. */
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#ifndef OPENSSL_HEADER_EC_INTERNAL_H
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#define OPENSSL_HEADER_EC_INTERNAL_H
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#include <openssl/base.h>
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#include <openssl/bn.h>
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#include <openssl/ex_data.h>
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#include <openssl/thread.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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struct ec_method_st {
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int (*group_init)(EC_GROUP *);
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void (*group_finish)(EC_GROUP *);
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int (*group_copy)(EC_GROUP *, const EC_GROUP *);
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int (*group_set_curve)(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *);
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int (*point_get_affine_coordinates)(const EC_GROUP *, const EC_POINT *,
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BIGNUM *x, BIGNUM *y, BN_CTX *);
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/* Computes |r = g_scalar*generator + p_scalar*p| if |g_scalar| and |p_scalar|
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* are both non-null. Computes |r = g_scalar*generator| if |p_scalar| is null.
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* Computes |r = p_scalar*p| if g_scalar is null. At least one of |g_scalar|
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* and |p_scalar| must be non-null, and |p| must be non-null if |p_scalar| is
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* non-null. */
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int (*mul)(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
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const EC_POINT *p, const BIGNUM *p_scalar, BN_CTX *ctx);
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/* |check_pub_key_order| checks that the public key is in the proper subgroup
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* by checking that |pub_key*group->order| is the point at infinity. This may
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* be NULL for |EC_METHOD|s specialized for prime-order curves (i.e. with
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* cofactor one), as this check is not necessary for such curves (See section
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* A.3 of the NSA's "Suite B Implementer's Guide to FIPS 186-3
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* (ECDSA)"). */
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int (*check_pub_key_order)(const EC_GROUP *group, const EC_POINT *pub_key,
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BN_CTX *ctx);
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/* 'field_mul' and 'field_sqr' can be used by 'add' and 'dbl' so that the
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* 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_mul)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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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,
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BN_CTX *); /* e.g. to Montgomery */
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int (*field_decode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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BN_CTX *); /* e.g. from Montgomery */
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int (*field_set_to_one)(const EC_GROUP *, BIGNUM *r, BN_CTX *);
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} /* EC_METHOD */;
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const EC_METHOD* EC_GFp_mont_method(void);
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struct ec_group_st {
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const EC_METHOD *meth;
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EC_POINT *generator;
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BIGNUM order, cofactor;
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int curve_name; /* optional NID for named curve */
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const BN_MONT_CTX *mont_data; /* data for ECDSA inverse */
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/* The following members are handled by the method functions,
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* even if they appear generic */
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BIGNUM field; /* For curves over GF(p), this is the modulus. */
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BIGNUM a, b; /* Curve coefficients. */
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int a_is_minus3; /* enable optimized point arithmetics for special case */
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BN_MONT_CTX *mont; /* Montgomery structure. */
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BIGNUM *one; /* The value one */
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} /* EC_GROUP */;
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struct ec_point_st {
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const EC_METHOD *meth;
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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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EC_GROUP *ec_group_new(const EC_METHOD *meth);
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int ec_group_copy(EC_GROUP *dest, const EC_GROUP *src);
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/* ec_group_get_mont_data returns a Montgomery context for operations in the
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* scalar field of |group|. It may return NULL in the case that |group| is not
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* a built-in group. */
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const BN_MONT_CTX *ec_group_get_mont_data(const EC_GROUP *group);
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int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
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const EC_POINT *p, const BIGNUM *p_scalar, BN_CTX *ctx);
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/* method functions in simple.c */
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int ec_GFp_simple_group_init(EC_GROUP *);
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void ec_GFp_simple_group_finish(EC_GROUP *);
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int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
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int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *);
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int ec_GFp_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
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BIGNUM *b, BN_CTX *);
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unsigned ec_GFp_simple_group_get_degree(const EC_GROUP *);
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int ec_GFp_simple_point_init(EC_POINT *);
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void ec_GFp_simple_point_finish(EC_POINT *);
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void ec_GFp_simple_point_clear_finish(EC_POINT *);
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int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
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int ec_GFp_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
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int ec_GFp_simple_set_Jprojective_coordinates_GFp(const EC_GROUP *, EC_POINT *,
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const BIGNUM *x,
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const BIGNUM *y,
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const BIGNUM *z, BN_CTX *);
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int ec_GFp_simple_get_Jprojective_coordinates_GFp(const EC_GROUP *,
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const EC_POINT *, BIGNUM *x,
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BIGNUM *y, BIGNUM *z,
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BN_CTX *);
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int ec_GFp_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
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const BIGNUM *x, const BIGNUM *y,
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BN_CTX *);
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int ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP *,
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const EC_POINT *, BIGNUM *x,
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BIGNUM *y, BN_CTX *);
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int ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
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const BIGNUM *x, int y_bit,
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BN_CTX *);
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int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
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const EC_POINT *b, BN_CTX *);
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int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
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BN_CTX *);
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int ec_GFp_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
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int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
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int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
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int ec_GFp_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
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BN_CTX *);
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int ec_GFp_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
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int ec_GFp_simple_points_make_affine(const EC_GROUP *, size_t num,
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EC_POINT * [], BN_CTX *);
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int ec_GFp_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *);
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int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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BN_CTX *);
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/* method functions in montgomery.c */
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int ec_GFp_mont_group_init(EC_GROUP *);
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int ec_GFp_mont_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *);
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void ec_GFp_mont_group_finish(EC_GROUP *);
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int ec_GFp_mont_group_copy(EC_GROUP *, const EC_GROUP *);
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int ec_GFp_mont_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *);
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int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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BN_CTX *);
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int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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BN_CTX *);
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int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
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BN_CTX *);
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int ec_GFp_mont_field_set_to_one(const EC_GROUP *, BIGNUM *r, BN_CTX *);
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int ec_point_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
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EC_POINT *point, const BIGNUM *x,
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const BIGNUM *y, const BIGNUM *z,
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BN_CTX *ctx);
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void ec_GFp_nistp_points_make_affine_internal(
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size_t num, void *point_array, size_t felem_size, void *tmp_felems,
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void (*felem_one)(void *out), int (*felem_is_zero)(const void *in),
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void (*felem_assign)(void *out, const void *in),
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void (*felem_square)(void *out, const void *in),
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void (*felem_mul)(void *out, const void *in1, const void *in2),
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void (*felem_inv)(void *out, const void *in),
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void (*felem_contract)(void *out, const void *in));
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void ec_GFp_nistp_recode_scalar_bits(uint8_t *sign, uint8_t *digit, uint8_t in);
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const EC_METHOD *EC_GFp_nistp224_method(void);
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const EC_METHOD *EC_GFp_nistp256_method(void);
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/* Returns GFp methods using montgomery multiplication, with x86-64
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* optimized P256. See http://eprint.iacr.org/2013/816. */
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const EC_METHOD *EC_GFp_nistz256_method(void);
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struct ec_key_st {
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EC_GROUP *group;
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EC_POINT *pub_key;
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BIGNUM *priv_key;
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unsigned int enc_flag;
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point_conversion_form_t conv_form;
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CRYPTO_refcount_t references;
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int flags;
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ECDSA_METHOD *ecdsa_meth;
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CRYPTO_EX_DATA ex_data;
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} /* EC_KEY */;
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/* curve_data contains data about a built-in elliptic curve. */
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struct curve_data {
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/* comment is a human-readable string describing the curve. */
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const char *comment;
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/* param_len is the number of bytes needed to store a field element. */
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uint8_t param_len;
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/* cofactor is the cofactor of the group (i.e. the number of elements in the
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* group divided by the size of the main subgroup. */
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uint8_t cofactor; /* promoted to BN_ULONG */
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/* data points to an array of 6*|param_len| bytes which hold the field
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* elements of the following (in big-endian order): prime, a, b, generator x,
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* generator y, order. */
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const uint8_t data[];
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};
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struct built_in_curve {
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int nid;
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const struct curve_data *data;
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const EC_METHOD *(*method)(void);
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};
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/* OPENSSL_built_in_curves is terminated with an entry where |nid| is
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* |NID_undef|. */
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extern const struct built_in_curve OPENSSL_built_in_curves[];
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#endif /* OPENSSL_HEADER_EC_INTERNAL_H */
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