GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/crypto/../../libssl/src/crypto/ec/ecp_mont.c Lines: 71 108 65.7 %
Date: 2016-12-06 Branches: 18 40 45.0 %

Line Branch Exec Source
1
/* $OpenBSD: ecp_mont.c,v 1.10 2015/02/13 00:46:03 beck Exp $ */
2
/*
3
 * Originally written by Bodo Moeller for the OpenSSL project.
4
 */
5
/* ====================================================================
6
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 *
12
 * 1. Redistributions of source code must retain the above copyright
13
 *    notice, this list of conditions and the following disclaimer.
14
 *
15
 * 2. Redistributions in binary form must reproduce the above copyright
16
 *    notice, this list of conditions and the following disclaimer in
17
 *    the documentation and/or other materials provided with the
18
 *    distribution.
19
 *
20
 * 3. All advertising materials mentioning features or use of this
21
 *    software must display the following acknowledgment:
22
 *    "This product includes software developed by the OpenSSL Project
23
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24
 *
25
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26
 *    endorse or promote products derived from this software without
27
 *    prior written permission. For written permission, please contact
28
 *    openssl-core@openssl.org.
29
 *
30
 * 5. Products derived from this software may not be called "OpenSSL"
31
 *    nor may "OpenSSL" appear in their names without prior written
32
 *    permission of the OpenSSL Project.
33
 *
34
 * 6. Redistributions of any form whatsoever must retain the following
35
 *    acknowledgment:
36
 *    "This product includes software developed by the OpenSSL Project
37
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38
 *
39
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50
 * OF THE POSSIBILITY OF SUCH DAMAGE.
51
 * ====================================================================
52
 *
53
 * This product includes cryptographic software written by Eric Young
54
 * (eay@cryptsoft.com).  This product includes software written by Tim
55
 * Hudson (tjh@cryptsoft.com).
56
 *
57
 */
58
/* ====================================================================
59
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60
 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
61
 * and contributed to the OpenSSL project.
62
 */
63
64
#include <openssl/err.h>
65
66
#include "ec_lcl.h"
67
68
69
const EC_METHOD *
70
EC_GFp_mont_method(void)
71
159
{
72
	static const EC_METHOD ret = {
73
		.flags = EC_FLAGS_DEFAULT_OCT,
74
		.field_type = NID_X9_62_prime_field,
75
		.group_init = ec_GFp_mont_group_init,
76
		.group_finish = ec_GFp_mont_group_finish,
77
		.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,
84
		.point_init = ec_GFp_simple_point_init,
85
		.point_finish = ec_GFp_simple_point_finish,
86
		.point_clear_finish = ec_GFp_simple_point_clear_finish,
87
		.point_copy = ec_GFp_simple_point_copy,
88
		.point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
89
		.point_set_Jprojective_coordinates_GFp =
90
		ec_GFp_simple_set_Jprojective_coordinates_GFp,
91
		.point_get_Jprojective_coordinates_GFp =
92
		ec_GFp_simple_get_Jprojective_coordinates_GFp,
93
		.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,
98
		.dbl = ec_GFp_simple_dbl,
99
		.invert = ec_GFp_simple_invert,
100
		.is_at_infinity = ec_GFp_simple_is_at_infinity,
101
		.is_on_curve = ec_GFp_simple_is_on_curve,
102
		.point_cmp = ec_GFp_simple_cmp,
103
		.make_affine = ec_GFp_simple_make_affine,
104
		.points_make_affine = ec_GFp_simple_points_make_affine,
105
		.field_mul = ec_GFp_mont_field_mul,
106
		.field_sqr = ec_GFp_mont_field_sqr,
107
		.field_encode = ec_GFp_mont_field_encode,
108
		.field_decode = ec_GFp_mont_field_decode,
109
		.field_set_to_one = ec_GFp_mont_field_set_to_one
110
	};
111
112
159
	return &ret;
113
}
114
115
116
int
117
ec_GFp_mont_group_init(EC_GROUP * group)
118
262
{
119
	int ok;
120
121
262
	ok = ec_GFp_simple_group_init(group);
122
262
	group->field_data1 = NULL;
123
262
	group->field_data2 = NULL;
124
262
	return ok;
125
}
126
127
128
void
129
ec_GFp_mont_group_finish(EC_GROUP * group)
130
258
{
131
258
	BN_MONT_CTX_free(group->field_data1);
132
258
	group->field_data1 = NULL;
133
258
	BN_free(group->field_data2);
134
258
	group->field_data2 = NULL;
135
258
	ec_GFp_simple_group_finish(group);
136
258
}
137
138
139
void
140
ec_GFp_mont_group_clear_finish(EC_GROUP * group)
141
{
142
	BN_MONT_CTX_free(group->field_data1);
143
	group->field_data1 = NULL;
144
	BN_clear_free(group->field_data2);
145
	group->field_data2 = NULL;
146
	ec_GFp_simple_group_clear_finish(group);
147
}
148
149
150
int
151
ec_GFp_mont_group_copy(EC_GROUP * dest, const EC_GROUP * src)
152
103
{
153
103
	BN_MONT_CTX_free(dest->field_data1);
154
103
	dest->field_data1 = NULL;
155
103
	BN_clear_free(dest->field_data2);
156
103
	dest->field_data2 = NULL;
157
158
103
	if (!ec_GFp_simple_group_copy(dest, src))
159
		return 0;
160
161
103
	if (src->field_data1 != NULL) {
162
103
		dest->field_data1 = BN_MONT_CTX_new();
163
103
		if (dest->field_data1 == NULL)
164
			return 0;
165
103
		if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
166
			goto err;
167
	}
168
103
	if (src->field_data2 != NULL) {
169
103
		dest->field_data2 = BN_dup(src->field_data2);
170
103
		if (dest->field_data2 == NULL)
171
			goto err;
172
	}
173
103
	return 1;
174
175
err:
176
	if (dest->field_data1 != NULL) {
177
		BN_MONT_CTX_free(dest->field_data1);
178
		dest->field_data1 = NULL;
179
	}
180
	return 0;
181
}
182
183
184
int
185
ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
186
    const BIGNUM *b, BN_CTX *ctx)
187
165
{
188
165
	BN_CTX *new_ctx = NULL;
189
165
	BN_MONT_CTX *mont = NULL;
190
165
	BIGNUM *one = NULL;
191
165
	int ret = 0;
192
193
165
	BN_MONT_CTX_free(group->field_data1);
194
165
	group->field_data1 = NULL;
195
165
	BN_free(group->field_data2);
196
165
	group->field_data2 = NULL;
197
165
	if (ctx == NULL) {
198
		ctx = new_ctx = BN_CTX_new();
199
		if (ctx == NULL)
200
			return 0;
201
	}
202
165
	mont = BN_MONT_CTX_new();
203
165
	if (mont == NULL)
204
		goto err;
205
165
	if (!BN_MONT_CTX_set(mont, p, ctx)) {
206
		ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
207
		goto err;
208
	}
209
165
	one = BN_new();
210
165
	if (one == NULL)
211
		goto err;
212
165
	if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
213
		goto err;
214
215
165
	group->field_data1 = mont;
216
165
	mont = NULL;
217
165
	group->field_data2 = one;
218
165
	one = NULL;
219
220
165
	ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
221
222
165
	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
	}
228
165
err:
229
165
	BN_CTX_free(new_ctx);
230
165
	BN_MONT_CTX_free(mont);
231
165
	BN_free(one);
232
165
	return ret;
233
}
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
937377
{
240
937377
	if (group->field_data1 == NULL) {
241
		ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
242
		return 0;
243
	}
244
937377
	return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
245
}
246
247
248
int
249
ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
250
    BN_CTX *ctx)
251
782465
{
252
782465
	if (group->field_data1 == NULL) {
253
		ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
254
		return 0;
255
	}
256
782465
	return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
257
}
258
259
260
int
261
ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
262
    BN_CTX *ctx)
263
1754
{
264
1754
	if (group->field_data1 == NULL) {
265
		ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
266
		return 0;
267
	}
268
1754
	return BN_to_montgomery(r, a, (BN_MONT_CTX *) group->field_data1, ctx);
269
}
270
271
272
int
273
ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
274
    BN_CTX *ctx)
275
429
{
276
429
	if (group->field_data1 == NULL) {
277
		ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
278
		return 0;
279
	}
280
429
	return BN_from_montgomery(r, a, group->field_data1, ctx);
281
}
282
283
284
int
285
ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
286
5613
{
287
5613
	if (group->field_data2 == NULL) {
288
		ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
289
		return 0;
290
	}
291
5613
	if (!BN_copy(r, group->field_data2))
292
		return 0;
293
5613
	return 1;
294
}