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1 : : /* x_long.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 long handling. This converts between an ASN1_INTEGER
65 : : * and a long directly.
66 : : */
67 : :
68 : :
69 : : static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
70 : : static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
71 : :
72 : : static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
73 : : static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
74 : : static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
75 : :
76 : : static ASN1_PRIMITIVE_FUNCS long_pf = {
77 : : NULL, 0,
78 : : long_new,
79 : : long_free,
80 : : long_free, /* Clear should set to initial value */
81 : : long_c2i,
82 : : long_i2c,
83 : : long_print
84 : : };
85 : :
86 : : ASN1_ITEM_start(LONG)
87 : : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
88 : : ASN1_ITEM_end(LONG)
89 : :
90 : : ASN1_ITEM_start(ZLONG)
91 : : ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
92 : : ASN1_ITEM_end(ZLONG)
93 : :
94 : 300 : static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
95 : : {
96 : 300 : *(long *)pval = it->size;
97 : 300 : return 1;
98 : : }
99 : :
100 : 303 : static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
101 : : {
102 : 303 : *(long *)pval = it->size;
103 : 303 : }
104 : :
105 : 1906 : static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
106 : : {
107 : : long ltmp;
108 : : unsigned long utmp;
109 : : int clen, pad, i;
110 : : /* this exists to bypass broken gcc optimization */
111 : 1906 : char *cp = (char *)pval;
112 : :
113 : : /* use memcpy, because we may not be long aligned */
114 : : memcpy(<mp, cp, sizeof(long));
115 : :
116 [ + - ]: 1906 : if(ltmp == it->size) return -1;
117 : : /* Convert the long to positive: we subtract one if negative so
118 : : * we can cleanly handle the padding if only the MSB of the leading
119 : : * octet is set.
120 : : */
121 [ - + ]: 1906 : if(ltmp < 0) utmp = -ltmp - 1;
122 : 1906 : else utmp = ltmp;
123 : 1906 : clen = BN_num_bits_word(utmp);
124 : : /* If MSB of leading octet set we need to pad */
125 [ + + ]: 1906 : if(!(clen & 0x7)) pad = 1;
126 : 1254 : else pad = 0;
127 : :
128 : : /* Convert number of bits to number of octets */
129 : 1906 : clen = (clen + 7) >> 3;
130 : :
131 [ + + ]: 1906 : if(cont) {
132 [ + + ][ + - ]: 268 : if(pad) *cont++ = (ltmp < 0) ? 0xff : 0;
133 [ + + ]: 439 : for(i = clen - 1; i >= 0; i--) {
134 : 171 : cont[i] = (unsigned char)(utmp & 0xff);
135 [ - + ]: 171 : if(ltmp < 0) cont[i] ^= 0xff;
136 : 171 : utmp >>= 8;
137 : : }
138 : : }
139 : 1906 : return clen + pad;
140 : : }
141 : :
142 : 1274 : static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
143 : : int utype, char *free_cont, const ASN1_ITEM *it)
144 : : {
145 : : int neg, i;
146 : : long ltmp;
147 : 1274 : unsigned long utmp = 0;
148 : 1274 : char *cp = (char *)pval;
149 [ - + ]: 1274 : if(len > (int)sizeof(long)) {
150 : 0 : ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
151 : 0 : return 0;
152 : : }
153 : : /* Is it negative? */
154 [ + - ][ + - ]: 1274 : if(len && (cont[0] & 0x80)) neg = 1;
155 : 1274 : else neg = 0;
156 : 1274 : utmp = 0;
157 [ + + ]: 2548 : for(i = 0; i < len; i++) {
158 : 1274 : utmp <<= 8;
159 [ - + ]: 1274 : if(neg) utmp |= cont[i] ^ 0xff;
160 : 1274 : else utmp |= cont[i];
161 : : }
162 : 1274 : ltmp = (long)utmp;
163 [ - + ]: 1274 : if(neg) {
164 : 0 : ltmp++;
165 : 0 : ltmp = -ltmp;
166 : : }
167 [ - + ]: 1274 : if(ltmp == it->size) {
168 : 0 : ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
169 : 0 : return 0;
170 : : }
171 : : memcpy(cp, <mp, sizeof(long));
172 : 1274 : return 1;
173 : : }
174 : :
175 : 0 : static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
176 : : int indent, const ASN1_PCTX *pctx)
177 : : {
178 : 0 : return BIO_printf(out, "%ld\n", *(long *)pval);
179 : : }
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