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1 : : /* x_bignum.c */
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 : : #include "cryptlib.h"
61 : : #include <openssl/asn1t.h>
62 : : #include <openssl/bn.h>
63 : :
64 : : /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
65 : : * BIGNUM directly. Currently it ignores the sign which isn't a problem since all
66 : : * BIGNUMs used are non negative and anything that looks negative is normally due
67 : : * to an encoding error.
68 : : */
69 : :
70 : : #define BN_SENSITIVE 1
71 : :
72 : : static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
73 : : static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
74 : :
75 : : static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
76 : : static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
77 : :
78 : : static ASN1_PRIMITIVE_FUNCS bignum_pf = {
79 : : NULL, 0,
80 : : bn_new,
81 : : bn_free,
82 : : 0,
83 : : bn_c2i,
84 : : bn_i2c
85 : : };
86 : :
87 : : ASN1_ITEM_start(BIGNUM)
88 : : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
89 : : ASN1_ITEM_end(BIGNUM)
90 : :
91 : : ASN1_ITEM_start(CBIGNUM)
92 : : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
93 : : ASN1_ITEM_end(CBIGNUM)
94 : :
95 : 17741 : static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
96 : : {
97 : 17741 : *pval = (ASN1_VALUE *)BN_new();
98 [ - + ]: 17741 : if(*pval) return 1;
99 : 0 : else return 0;
100 : : }
101 : :
102 : 1254 : static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
103 : : {
104 [ + + ]: 1254 : if(!*pval) return;
105 [ + - ]: 1252 : if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval);
106 : 0 : else BN_free((BIGNUM *)*pval);
107 : 1252 : *pval = NULL;
108 : : }
109 : :
110 : 2132 : static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
111 : : {
112 : : BIGNUM *bn;
113 : : int pad;
114 [ + - ]: 2132 : if(!*pval) return -1;
115 : 2132 : bn = (BIGNUM *)*pval;
116 : : /* If MSB set in an octet we need a padding byte */
117 [ + + ]: 2132 : if(BN_num_bits(bn) & 0x7) pad = 0;
118 : 791 : else pad = 1;
119 [ + + ]: 2132 : if(cont) {
120 [ + + ]: 654 : if(pad) *cont++ = 0;
121 : 654 : BN_bn2bin(bn, cont);
122 : : }
123 : 2132 : return pad + BN_num_bytes(bn);
124 : : }
125 : :
126 : 17465 : static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
127 : : int utype, char *free_cont, const ASN1_ITEM *it)
128 : : {
129 : : BIGNUM *bn;
130 [ + + ]: 17465 : if(!*pval) bn_new(pval, it);
131 : 17465 : bn = (BIGNUM *)*pval;
132 [ - + ]: 17465 : if(!BN_bin2bn(cont, len, bn)) {
133 : 0 : bn_free(pval, it);
134 : 0 : return 0;
135 : : }
136 : : return 1;
137 : : }
138 : :
139 : :
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