/src/libressl/crypto/ec/ec_check.c

Source (jump to first uncovered line)
/* $OpenBSD: ec_check.c,v 1.9 2018/07/15 16:27:39 tb Exp $ */
/* ====================================================================
 * Copyright (c) 1998-2002 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 "ec_lcl.h"
#include <openssl/err.h>

int 
EC_GROUP_check(const EC_GROUP * group, BN_CTX * ctx)
{
  int ret = 0;
  BIGNUM *order;
  BN_CTX *new_ctx = NULL;
  EC_POINT *point = NULL;

  if (ctx == NULL) {
    ctx = new_ctx = BN_CTX_new();
    if (ctx == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
  }
  BN_CTX_start(ctx);
  if ((order = BN_CTX_get(ctx)) == NULL)
    goto err;

  /* check the discriminant */
  if (!EC_GROUP_check_discriminant(group, ctx)) {
    ECerror(EC_R_DISCRIMINANT_IS_ZERO);
    goto err;
  }
  /* check the generator */
  if (group->generator == NULL) {
    ECerror(EC_R_UNDEFINED_GENERATOR);
    goto err;
  }
  if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
    ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
    goto err;
  }
  /* check the order of the generator */
  if ((point = EC_POINT_new(group)) == NULL)
    goto err;
  if (!EC_GROUP_get_order(group, order, ctx))
    goto err;
  if (BN_is_zero(order)) {
    ECerror(EC_R_UNDEFINED_ORDER);
    goto err;
  }
  if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
    goto err;
  if (EC_POINT_is_at_infinity(group, point) <= 0) {
    ECerror(EC_R_INVALID_GROUP_ORDER);
    goto err;
  }
  ret = 1;

 err:
  if (ctx != NULL)
    BN_CTX_end(ctx);
  BN_CTX_free(new_ctx);
  EC_POINT_free(point);
  return ret;
}

Line	Count	Source (jump to first uncovered line)
1		/* $OpenBSD: ec_check.c,v 1.9 2018/07/15 16:27:39 tb Exp $ */
2		/* ====================================================================
3		* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
4		*
5		* Redistribution and use in source and binary forms, with or without
6		* modification, are permitted provided that the following conditions
7		* are met:
8		*
9		* 1. Redistributions of source code must retain the above copyright
10		* notice, this list of conditions and the following disclaimer.
11		*
12		* 2. Redistributions in binary form must reproduce the above copyright
13		* notice, this list of conditions and the following disclaimer in
14		* the documentation and/or other materials provided with the
15		* distribution.
16		*
17		* 3. All advertising materials mentioning features or use of this
18		* software must display the following acknowledgment:
19		* "This product includes software developed by the OpenSSL Project
20		* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21		*
22		* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23		* endorse or promote products derived from this software without
24		* prior written permission. For written permission, please contact
25		* openssl-core@openssl.org.
26		*
27		* 5. Products derived from this software may not be called "OpenSSL"
28		* nor may "OpenSSL" appear in their names without prior written
29		* permission of the OpenSSL Project.
30		*
31		* 6. Redistributions of any form whatsoever must retain the following
32		* acknowledgment:
33		* "This product includes software developed by the OpenSSL Project
34		* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35		*
36		* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37		* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39		* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40		* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41		* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42		* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43		* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45		* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46		* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47		* OF THE POSSIBILITY OF SUCH DAMAGE.
48		* ====================================================================
49		*
50		* This product includes cryptographic software written by Eric Young
51		* (eay@cryptsoft.com). This product includes software written by Tim
52		* Hudson (tjh@cryptsoft.com).
53		*
54		*/
55
56		#include "ec_lcl.h"
57		#include <openssl/err.h>
58
59		int
60		EC_GROUP_check(const EC_GROUP * group, BN_CTX * ctx)
61	2.41k	{
62	2.41k	int ret = 0;
63	2.41k	BIGNUM *order;
64	2.41k	BN_CTX *new_ctx = NULL;
65	2.41k	EC_POINT *point = NULL;
66
67	2.41k	if (ctx == NULL) {
68	2.41k	ctx = new_ctx = BN_CTX_new();
69	2.41k	if (ctx == NULL) {
70	0	ECerror(ERR_R_MALLOC_FAILURE);
71	0	goto err;
72	0	}
73	2.41k	}
74	2.41k	BN_CTX_start(ctx);
75	2.41k	if ((order = BN_CTX_get(ctx)) == NULL)
76	0	goto err;
77
78		/* check the discriminant */
79	2.41k	if (!EC_GROUP_check_discriminant(group, ctx)) {
80	0	ECerror(EC_R_DISCRIMINANT_IS_ZERO);
81	0	goto err;
82	0	}
83		/* check the generator */
84	2.41k	if (group->generator == NULL) {
85	0	ECerror(EC_R_UNDEFINED_GENERATOR);
86	0	goto err;
87	0	}
88	2.41k	if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
89	0	ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
90	0	goto err;
91	0	}
92		/* check the order of the generator */
93	2.41k	if ((point = EC_POINT_new(group)) == NULL)
94	0	goto err;
95	2.41k	if (!EC_GROUP_get_order(group, order, ctx))
96	0	goto err;
97	2.41k	if (BN_is_zero(order)) {
98	0	ECerror(EC_R_UNDEFINED_ORDER);
99	0	goto err;
100	0	}
101	2.41k	if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
102	0	goto err;
103	2.41k	if (EC_POINT_is_at_infinity(group, point) <= 0) {
104	0	ECerror(EC_R_INVALID_GROUP_ORDER);
105	0	goto err;
106	0	}
107	2.41k	ret = 1;
108
109	2.41k	err:
110	2.41k	if (ctx != NULL)
111	2.41k	BN_CTX_end(ctx);
112	2.41k	BN_CTX_free(new_ctx);
113	2.41k	EC_POINT_free(point);
114	2.41k	return ret;
115	2.41k	}

Coverage Report

Created: 2022-08-24 06:30