Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/asn1/x_bignum.c	Lines:	26	31	83.9 %
Date:	2017-11-07	Branches:	13	18	72.2 %


/* $OpenBSD: x_bignum.c,v 1.8 2015/07/25 17:07:17 jsing Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 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
 *    licensing@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 <stdio.h>

#include <openssl/asn1t.h>
#include <openssl/bn.h>

/*
 * Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
 * BIGNUM directly. Currently it ignores the sign which isn't a problem since
 * all BIGNUMs used are non negative and anything that looks negative is
 * normally due to an encoding error.
 */

static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);

static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
    const ASN1_ITEM *it);
static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
    int utype, char *free_cont, const ASN1_ITEM *it);

static ASN1_PRIMITIVE_FUNCS bignum_pf = {
	NULL,
	0,
	bn_new,
	bn_free,
	0,
	bn_c2i,
	bn_i2c
};

const ASN1_ITEM BIGNUM_it = {
        .itype = ASN1_ITYPE_PRIMITIVE,
        .utype = V_ASN1_INTEGER,
        .templates = NULL,
        .tcount = 0,
        .funcs = &bignum_pf,
        .size = 0,
        .sname = "BIGNUM",
};

const ASN1_ITEM CBIGNUM_it = {
        .itype = ASN1_ITYPE_PRIMITIVE,
        .utype = V_ASN1_INTEGER,
        .templates = NULL,
        .tcount = 0,
        .funcs = &bignum_pf,
        .size = 0,
        .sname = "BIGNUM",
};

static int
bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
	*pval = (ASN1_VALUE *)BN_new();
	if (*pval)
		return 1;
	else
		return 0;
}

static void
bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
	if (*pval == NULL)
		return;
	BN_clear_free((BIGNUM *)*pval);
	*pval = NULL;
}

static int
bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
{
	BIGNUM *bn;
	int pad, len;

	if (*pval == NULL)
		return -1;
	bn = (BIGNUM *)*pval;
	/* If MSB set in an octet we need a padding byte */
	if (BN_num_bits(bn) & 0x7)
		pad = 0;
	else
		pad = 1;
	if (cont) {
		if (pad)
			*cont++ = 0;
		len = BN_bn2bin(bn, cont);
	} else
		len = BN_num_bytes(bn);
	return pad + len;
}

static int
bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
    char *free_cont, const ASN1_ITEM *it)
{
	BIGNUM *bn;

	if (*pval == NULL) {
		if (bn_new(pval, it) == 0)
			return 0;
	}
	bn = (BIGNUM *)*pval;
	if (!BN_bin2bn(cont, len, bn)) {
		bn_free(pval, it);
		return 0;
	}
	return 1;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: x_bignum.c,v 1.8 2015/07/25 17:07:17 jsing Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2000.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2000 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			* licensing@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			#include <stdio.h>
60
61			#include <openssl/asn1t.h>
62			#include <openssl/bn.h>
63
64			/*
65			* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
66			* BIGNUM directly. Currently it ignores the sign which isn't a problem since
67			* all BIGNUMs used are non negative and anything that looks negative is
68			* normally due to an encoding error.
69			*/
70
71			static int bn_new(ASN1_VALUE *pval, const ASN1_ITEM it);
72			static void bn_free(ASN1_VALUE *pval, const ASN1_ITEM it);
73
74			static int bn_i2c(ASN1_VALUE *pval, unsigned char cont, int *putype,
75			const ASN1_ITEM *it);
76			static int bn_c2i(ASN1_VALUE *pval, const unsigned char cont, int len,
77			int utype, char free_cont, const ASN1_ITEM it);
78
79			static ASN1_PRIMITIVE_FUNCS bignum_pf = {
80			NULL,
81			0,
82			bn_new,
83			bn_free,
84			0,
85			bn_c2i,
86			bn_i2c
87			};
88
89			const ASN1_ITEM BIGNUM_it = {
90			.itype = ASN1_ITYPE_PRIMITIVE,
91			.utype = V_ASN1_INTEGER,
92			.templates = NULL,
93			.tcount = 0,
94			.funcs = &bignum_pf,
95			.size = 0,
96			.sname = "BIGNUM",
97			};
98
99			const ASN1_ITEM CBIGNUM_it = {
100			.itype = ASN1_ITYPE_PRIMITIVE,
101			.utype = V_ASN1_INTEGER,
102			.templates = NULL,
103			.tcount = 0,
104			.funcs = &bignum_pf,
105			.size = 0,
106			.sname = "BIGNUM",
107			};
108
109			static int
110			bn_new(ASN1_VALUE *pval, const ASN1_ITEM it)
111			{
112		38216	pval = (ASN1_VALUE )BN_new();
113	✓✗	19108	if (*pval)
114		19108	return 1;
115			else
116			return 0;
117		19108	}
118
119			static void
120			bn_free(ASN1_VALUE *pval, const ASN1_ITEM it)
121			{
122	✓✗	14596	if (*pval == NULL)
123			return;
124		7298	BN_clear_free((BIGNUM )pval);
125		7298	*pval = NULL;
126		14596	}
127
128			static int
129			bn_i2c(ASN1_VALUE *pval, unsigned char cont, int putype, const ASN1_ITEM it)
130			{
131			BIGNUM *bn;
132			int pad, len;
133
134	✗✓	75016	if (*pval == NULL)
135			return -1;
136		37508	bn = (BIGNUM )pval;
137			/* If MSB set in an octet we need a padding byte */
138	✓✓	37508	if (BN_num_bits(bn) & 0x7)
139		24033	pad = 0;
140			else
141			pad = 1;
142	✓✓	37508	if (cont) {
143	✓✓	10069	if (pad)
144		3571	*cont++ = 0;
145		10069	len = BN_bn2bin(bn, cont);
146		10069	} else
147		27439	len = BN_num_bytes(bn);
148		37508	return pad + len;
149		37508	}
150
151			static int
152			bn_c2i(ASN1_VALUE *pval, const unsigned char cont, int len, int utype,
153			char free_cont, const ASN1_ITEM it)
154			{
155			BIGNUM *bn;
156
157	✓✓	34564	if (*pval == NULL) {
158	✗✓	11810	if (bn_new(pval, it) == 0)
159			return 0;
160			}
161		17282	bn = (BIGNUM )pval;
162	✗✓	17282	if (!BN_bin2bn(cont, len, bn)) {
163			bn_free(pval, it);
164			return 0;
165			}
166		17282	return 1;
167		17282	}