GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/ec/ecp_mont.c Lines: 63 92 68.5 %
Date: 2017-11-13 Branches: 20 40 50.0 %

Line Branch Exec Source
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/* $OpenBSD: ecp_mont.c,v 1.11 2017/01/29 17:49:23 beck Exp $ */
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/*
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 * Originally written by Bodo Moeller for the OpenSSL project.
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 */
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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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/* ====================================================================
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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
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 * and contributed to the OpenSSL project.
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 */
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64
#include <openssl/err.h>
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66
#include "ec_lcl.h"
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68
69
const EC_METHOD *
70
EC_GFp_mont_method(void)
71
{
72
	static const EC_METHOD ret = {
73
		.flags = EC_FLAGS_DEFAULT_OCT,
74
		.field_type = NID_X9_62_prime_field,
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		.group_init = ec_GFp_mont_group_init,
76
		.group_finish = ec_GFp_mont_group_finish,
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		.group_clear_finish = ec_GFp_mont_group_clear_finish,
78
		.group_copy = ec_GFp_mont_group_copy,
79
		.group_set_curve = ec_GFp_mont_group_set_curve,
80
		.group_get_curve = ec_GFp_simple_group_get_curve,
81
		.group_get_degree = ec_GFp_simple_group_get_degree,
82
		.group_check_discriminant =
83
		ec_GFp_simple_group_check_discriminant,
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		.point_init = ec_GFp_simple_point_init,
85
		.point_finish = ec_GFp_simple_point_finish,
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		.point_clear_finish = ec_GFp_simple_point_clear_finish,
87
		.point_copy = ec_GFp_simple_point_copy,
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		.point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
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		.point_set_Jprojective_coordinates_GFp =
90
		ec_GFp_simple_set_Jprojective_coordinates_GFp,
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		.point_get_Jprojective_coordinates_GFp =
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		ec_GFp_simple_get_Jprojective_coordinates_GFp,
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		.point_set_affine_coordinates =
94
		ec_GFp_simple_point_set_affine_coordinates,
95
		.point_get_affine_coordinates =
96
		ec_GFp_simple_point_get_affine_coordinates,
97
		.add = ec_GFp_simple_add,
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		.dbl = ec_GFp_simple_dbl,
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		.invert = ec_GFp_simple_invert,
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		.is_at_infinity = ec_GFp_simple_is_at_infinity,
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		.is_on_curve = ec_GFp_simple_is_on_curve,
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		.point_cmp = ec_GFp_simple_cmp,
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		.make_affine = ec_GFp_simple_make_affine,
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		.points_make_affine = ec_GFp_simple_points_make_affine,
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		.field_mul = ec_GFp_mont_field_mul,
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		.field_sqr = ec_GFp_mont_field_sqr,
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		.field_encode = ec_GFp_mont_field_encode,
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		.field_decode = ec_GFp_mont_field_decode,
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		.field_set_to_one = ec_GFp_mont_field_set_to_one
110
	};
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112
4470
	return &ret;
113
}
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115
116
int
117
ec_GFp_mont_group_init(EC_GROUP * group)
118
{
119
	int ok;
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121
10242
	ok = ec_GFp_simple_group_init(group);
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5121
	group->field_data1 = NULL;
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5121
	group->field_data2 = NULL;
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5121
	return ok;
125
}
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127
128
void
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ec_GFp_mont_group_finish(EC_GROUP * group)
130
{
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10242
	BN_MONT_CTX_free(group->field_data1);
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5121
	group->field_data1 = NULL;
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5121
	BN_free(group->field_data2);
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5121
	group->field_data2 = NULL;
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5121
	ec_GFp_simple_group_finish(group);
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5121
}
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138
139
void
140
ec_GFp_mont_group_clear_finish(EC_GROUP * group)
141
{
142
	BN_MONT_CTX_free(group->field_data1);
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	group->field_data1 = NULL;
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	BN_clear_free(group->field_data2);
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	group->field_data2 = NULL;
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	ec_GFp_simple_group_clear_finish(group);
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}
148
149
150
int
151
ec_GFp_mont_group_copy(EC_GROUP * dest, const EC_GROUP * src)
152
{
153
5772
	BN_MONT_CTX_free(dest->field_data1);
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2886
	dest->field_data1 = NULL;
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2886
	BN_clear_free(dest->field_data2);
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2886
	dest->field_data2 = NULL;
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158
2886
	if (!ec_GFp_simple_group_copy(dest, src))
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		return 0;
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161
2886
	if (src->field_data1 != NULL) {
162
2886
		dest->field_data1 = BN_MONT_CTX_new();
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2886
		if (dest->field_data1 == NULL)
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			return 0;
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2886
		if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
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			goto err;
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	}
168
2886
	if (src->field_data2 != NULL) {
169
2886
		dest->field_data2 = BN_dup(src->field_data2);
170
2886
		if (dest->field_data2 == NULL)
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			goto err;
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	}
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2886
	return 1;
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175
err:
176
	if (dest->field_data1 != NULL) {
177
		BN_MONT_CTX_free(dest->field_data1);
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		dest->field_data1 = NULL;
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	}
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	return 0;
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2886
}
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183
184
int
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ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
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    const BIGNUM *b, BN_CTX *ctx)
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{
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	BN_CTX *new_ctx = NULL;
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	BN_MONT_CTX *mont = NULL;
190
	BIGNUM *one = NULL;
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	int ret = 0;
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193
4506
	BN_MONT_CTX_free(group->field_data1);
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2253
	group->field_data1 = NULL;
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2253
	BN_free(group->field_data2);
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2253
	group->field_data2 = NULL;
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2253
	if (ctx == NULL) {
198
102
		ctx = new_ctx = BN_CTX_new();
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102
		if (ctx == NULL)
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			return 0;
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	}
202
2253
	mont = BN_MONT_CTX_new();
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2253
	if (mont == NULL)
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		goto err;
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2253
	if (!BN_MONT_CTX_set(mont, p, ctx)) {
206
		ECerror(ERR_R_BN_LIB);
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		goto err;
208
	}
209
2253
	one = BN_new();
210
2253
	if (one == NULL)
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		goto err;
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2253
	if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
213
		goto err;
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215
2253
	group->field_data1 = mont;
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	mont = NULL;
217
2253
	group->field_data2 = one;
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	one = NULL;
219
220
2253
	ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
221
222
2253
	if (!ret) {
223
		BN_MONT_CTX_free(group->field_data1);
224
		group->field_data1 = NULL;
225
		BN_free(group->field_data2);
226
		group->field_data2 = NULL;
227
	}
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err:
229
2253
	BN_CTX_free(new_ctx);
230
2253
	BN_MONT_CTX_free(mont);
231
2253
	BN_free(one);
232
2253
	return ret;
233
2253
}
234
235
236
int
237
ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
238
    const BIGNUM *b, BN_CTX *ctx)
239
{
240
14514554
	if (group->field_data1 == NULL) {
241
		ECerror(EC_R_NOT_INITIALIZED);
242
		return 0;
243
	}
244
7257277
	return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
245
7257277
}
246
247
248
int
249
ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
250
    BN_CTX *ctx)
251
{
252
12112170
	if (group->field_data1 == NULL) {
253
		ECerror(EC_R_NOT_INITIALIZED);
254
		return 0;
255
	}
256
6056085
	return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
257
6056085
}
258
259
260
int
261
ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
262
    BN_CTX *ctx)
263
{
264
41932
	if (group->field_data1 == NULL) {
265
		ECerror(EC_R_NOT_INITIALIZED);
266
		return 0;
267
	}
268
20966
	return BN_to_montgomery(r, a, (BN_MONT_CTX *) group->field_data1, ctx);
269
20966
}
270
271
272
int
273
ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
274
    BN_CTX *ctx)
275
{
276
18062
	if (group->field_data1 == NULL) {
277
		ECerror(EC_R_NOT_INITIALIZED);
278
		return 0;
279
	}
280
9031
	return BN_from_montgomery(r, a, group->field_data1, ctx);
281
9031
}
282
283
284
int
285
ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
286
{
287
64818
	if (group->field_data2 == NULL) {
288
		ECerror(EC_R_NOT_INITIALIZED);
289
		return 0;
290
	}
291
32409
	if (!BN_copy(r, group->field_data2))
292
		return 0;
293
32409
	return 1;
294
32409
}