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 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
95 {
96 *(long *)pval = it->size;
97 return 1;
98 }
99
100 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
101 {
102 *(long *)pval = it->size;
103 }
104
105 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 char *cp = (char *)pval;
112
113 /* use memcpy, because we may not be long aligned */
114 memcpy(<mp, cp, sizeof(long));
115
116 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 if(ltmp < 0) utmp = -ltmp - 1;
122 else utmp = ltmp;
123 clen = BN_num_bits_word(utmp);
124 /* If MSB of leading octet set we need to pad */
125 if(!(clen & 0x7)) pad = 1;
126 else pad = 0;
127
128 /* Convert number of bits to number of octets */
129 clen = (clen + 7) >> 3;
130
131 if(cont) {
132 if(pad) *cont++ = (ltmp < 0) ? 0xff : 0;
133 for(i = clen - 1; i >= 0; i--) {
134 cont[i] = (unsigned char)(utmp & 0xff);
135 if(ltmp < 0) cont[i] ^= 0xff;
136 utmp >>= 8;
137 }
138 }
139 return clen + pad;
140 }
141
142 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 unsigned long utmp = 0;
148 char *cp = (char *)pval;
149 if(len > (int)sizeof(long)) {
150 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
151 return 0;
152 }
153 /* Is it negative? */
154 if(len && (cont[0] & 0x80)) neg = 1;
155 else neg = 0;
156 utmp = 0;
157 for(i = 0; i < len; i++) {
158 utmp <<= 8;
159 if(neg) utmp |= cont[i] ^ 0xff;
160 else utmp |= cont[i];
161 }
162 ltmp = (long)utmp;
163 if(neg) {
164 ltmp++;
165 ltmp = -ltmp;
166 }
167 if(ltmp == it->size) {
168 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
169 return 0;
170 }
171 memcpy(cp, <mp, sizeof(long));
172 return 1;
173 }
174
175 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
176 int indent, const ASN1_PCTX *pctx)
177 {
178 return BIO_printf(out, "%ld\n", *(long *)pval);
179 }