/src/openssl/crypto/asn1/x_bignum.c

Source (jump to first uncovered line)
/* x_bignum.c */
/*
 * 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 "cryptlib.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.
 */

#define BN_SENSITIVE    1

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 int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
                    int indent, const ASN1_PCTX *pctx);

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

ASN1_ITEM_start(BIGNUM)
        ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
ASN1_ITEM_end(BIGNUM)

ASN1_ITEM_start(CBIGNUM)
        ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
ASN1_ITEM_end(CBIGNUM)

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)
        return;
    if (it->size & BN_SENSITIVE)
        BN_clear_free((BIGNUM *)*pval);
    else
        BN_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;
    if (!*pval)
        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;
        BN_bn2bin(bn, cont);
    }
    return pad + BN_num_bytes(bn);
}

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

static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
                    int indent, const ASN1_PCTX *pctx)
{
    if (!BN_print(out, *(BIGNUM **)pval))
        return 0;
    if (BIO_puts(out, "\n") <= 0)
        return 0;
    return 1;
}

Line	Count	Source (jump to first uncovered line)
1		/* x_bignum.c */
2		/*
3		* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4		* 2000.
5		*/
6		/* ====================================================================
7		* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8		*
9		* Redistribution and use in source and binary forms, with or without
10		* modification, are permitted provided that the following conditions
11		* are met:
12		*
13		* 1. Redistributions of source code must retain the above copyright
14		* notice, this list of conditions and the following disclaimer.
15		*
16		* 2. Redistributions in binary form must reproduce the above copyright
17		* notice, this list of conditions and the following disclaimer in
18		* the documentation and/or other materials provided with the
19		* distribution.
20		*
21		* 3. All advertising materials mentioning features or use of this
22		* software must display the following acknowledgment:
23		* "This product includes software developed by the OpenSSL Project
24		* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25		*
26		* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27		* endorse or promote products derived from this software without
28		* prior written permission. For written permission, please contact
29		* licensing@OpenSSL.org.
30		*
31		* 5. Products derived from this software may not be called "OpenSSL"
32		* nor may "OpenSSL" appear in their names without prior written
33		* permission of the OpenSSL Project.
34		*
35		* 6. Redistributions of any form whatsoever must retain the following
36		* acknowledgment:
37		* "This product includes software developed by the OpenSSL Project
38		* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39		*
40		* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41		* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43		* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44		* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45		* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46		* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47		* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49		* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50		* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51		* OF THE POSSIBILITY OF SUCH DAMAGE.
52		* ====================================================================
53		*
54		* This product includes cryptographic software written by Eric Young
55		* (eay@cryptsoft.com). This product includes software written by Tim
56		* Hudson (tjh@cryptsoft.com).
57		*
58		*/
59
60		#include <stdio.h>
61		#include "cryptlib.h"
62		#include <openssl/asn1t.h>
63		#include <openssl/bn.h>
64
65		/*
66		* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER
67		* as a BIGNUM directly. Currently it ignores the sign which isn't a problem
68		* since all BIGNUMs used are non negative and anything that looks negative
69		* is normally due to an encoding error.
70		*/
71
72	0	#define BN_SENSITIVE 1
73
74		static int bn_new(ASN1_VALUE *pval, const ASN1_ITEM it);
75		static void bn_free(ASN1_VALUE *pval, const ASN1_ITEM it);
76
77		static int bn_i2c(ASN1_VALUE *pval, unsigned char cont, int *putype,
78		const ASN1_ITEM *it);
79		static int bn_c2i(ASN1_VALUE *pval, const unsigned char cont, int len,
80		int utype, char free_cont, const ASN1_ITEM it);
81		static int bn_print(BIO out, ASN1_VALUE pval, const ASN1_ITEM it,
82		int indent, const ASN1_PCTX *pctx);
83
84		static ASN1_PRIMITIVE_FUNCS bignum_pf = {
85		NULL, 0,
86		bn_new,
87		bn_free,
88		0,
89		bn_c2i,
90		bn_i2c,
91		bn_print
92		};
93
94		ASN1_ITEM_start(BIGNUM)
95		ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
96		ASN1_ITEM_end(BIGNUM)
97
98		ASN1_ITEM_start(CBIGNUM)
99		ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
100		ASN1_ITEM_end(CBIGNUM)
101
102		static int bn_new(ASN1_VALUE *pval, const ASN1_ITEM it)
103	0	{
104	0	pval = (ASN1_VALUE )BN_new();
105	0	if (*pval)
106	0	return 1;
107	0	else
108	0	return 0;
109	0	}
110
111		static void bn_free(ASN1_VALUE *pval, const ASN1_ITEM it)
112	0	{
113	0	if (!*pval)
114	0	return;
115	0	if (it->size & BN_SENSITIVE)
116	0	BN_clear_free((BIGNUM )pval);
117	0	else
118	0	BN_free((BIGNUM )pval);
119	0	*pval = NULL;
120	0	}
121
122		static int bn_i2c(ASN1_VALUE *pval, unsigned char cont, int *putype,
123		const ASN1_ITEM *it)
124	0	{
125	0	BIGNUM *bn;
126	0	int pad;
127	0	if (!*pval)
128	0	return -1;
129	0	bn = (BIGNUM )pval;
130		/* If MSB set in an octet we need a padding byte */
131	0	if (BN_num_bits(bn) & 0x7)
132	0	pad = 0;
133	0	else
134	0	pad = 1;
135	0	if (cont) {
136	0	if (pad)
137	0	*cont++ = 0;
138	0	BN_bn2bin(bn, cont);
139	0	}
140	0	return pad + BN_num_bytes(bn);
141	0	}
142
143		static int bn_c2i(ASN1_VALUE *pval, const unsigned char cont, int len,
144		int utype, char free_cont, const ASN1_ITEM it)
145	0	{
146	0	BIGNUM *bn;
147
148	0	if (*pval == NULL && !bn_new(pval, it))
149	0	return 0;
150	0	bn = (BIGNUM )pval;
151	0	if (!BN_bin2bn(cont, len, bn)) {
152	0	bn_free(pval, it);
153	0	return 0;
154	0	}
155	0	return 1;
156	0	}
157
158		static int bn_print(BIO out, ASN1_VALUE pval, const ASN1_ITEM it,
159		int indent, const ASN1_PCTX *pctx)
160	0	{
161	0	if (!BN_print(out, (BIGNUM *)pval))
162	0	return 0;
163	0	if (BIO_puts(out, "\n") <= 0)
164	0	return 0;
165	0	return 1;
166	0	}

Coverage Report

Created: 2022-11-30 06:20