Line data Source code
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 : #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 :
82 : static ASN1_PRIMITIVE_FUNCS bignum_pf = {
83 : NULL, 0,
84 : bn_new,
85 : bn_free,
86 : 0,
87 : bn_c2i,
88 : bn_i2c
89 : };
90 :
91 : ASN1_ITEM_start(BIGNUM)
92 : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
93 : ASN1_ITEM_end(BIGNUM)
94 :
95 : ASN1_ITEM_start(CBIGNUM)
96 : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
97 : ASN1_ITEM_end(CBIGNUM)
98 :
99 0 : static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
100 : {
101 5878 : *pval = (ASN1_VALUE *)BN_new();
102 0 : if (*pval)
103 : return 1;
104 : else
105 0 : return 0;
106 : }
107 :
108 0 : static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
109 : {
110 0 : if (!*pval)
111 0 : return;
112 0 : if (it->size & BN_SENSITIVE)
113 0 : BN_clear_free((BIGNUM *)*pval);
114 : else
115 0 : BN_free((BIGNUM *)*pval);
116 0 : *pval = NULL;
117 : }
118 :
119 0 : static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
120 : const ASN1_ITEM *it)
121 : {
122 : BIGNUM *bn;
123 : int pad;
124 0 : if (!*pval)
125 : return -1;
126 : bn = (BIGNUM *)*pval;
127 : /* If MSB set in an octet we need a padding byte */
128 0 : if (BN_num_bits(bn) & 0x7)
129 : pad = 0;
130 : else
131 : pad = 1;
132 0 : if (cont) {
133 0 : if (pad)
134 0 : *cont++ = 0;
135 0 : BN_bn2bin(bn, cont);
136 : }
137 0 : return pad + BN_num_bytes(bn);
138 : }
139 :
140 5878 : static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
141 : int utype, char *free_cont, const ASN1_ITEM *it)
142 : {
143 : BIGNUM *bn;
144 5878 : if (!*pval)
145 : bn_new(pval, it);
146 5878 : bn = (BIGNUM *)*pval;
147 5878 : if (!BN_bin2bn(cont, len, bn)) {
148 0 : bn_free(pval, it);
149 0 : return 0;
150 : }
151 : return 1;
152 : }
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