1 /* $OpenBSD: x_long.c,v 1.16 2019/04/20 11:13:15 jsing Exp $ */
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 <string.h>
61
62 #include <openssl/asn1t.h>
63 #include <openssl/bn.h>
64 #include <openssl/err.h>
65
66 /*
67 * Custom primitive type for long handling. This converts between an
68 * ASN1_INTEGER and a long directly.
69 */
70
71 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
72 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
73
74 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
75 const ASN1_ITEM *it);
76 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
77 int utype, char *free_cont, const ASN1_ITEM *it);
78 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
79 int indent, const ASN1_PCTX *pctx);
80
81 static ASN1_PRIMITIVE_FUNCS long_pf = {
82 .app_data = NULL,
83 .flags = 0,
84 .prim_new = long_new,
85 .prim_free = long_free,
86 .prim_clear = long_free, /* Clear should set to initial value */
87 .prim_c2i = long_c2i,
88 .prim_i2c = long_i2c,
89 .prim_print = long_print,
90 };
91
92 const ASN1_ITEM LONG_it = {
93 .itype = ASN1_ITYPE_PRIMITIVE,
94 .utype = V_ASN1_INTEGER,
95 .templates = NULL,
96 .tcount = 0,
97 .funcs = &long_pf,
98 .size = ASN1_LONG_UNDEF,
99 .sname = "LONG",
100 };
101
102 const ASN1_ITEM ZLONG_it = {
103 .itype = ASN1_ITYPE_PRIMITIVE,
104 .utype = V_ASN1_INTEGER,
105 .templates = NULL,
106 .tcount = 0,
107 .funcs = &long_pf,
108 .size = 0,
109 .sname = "ZLONG",
110 };
111
112 static int
long_new(ASN1_VALUE ** pval,const ASN1_ITEM * it)113 long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
114 {
115 *(long *)pval = it->size;
116 return 1;
117 }
118
119 static void
long_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)120 long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
121 {
122 *(long *)pval = it->size;
123 }
124
125 static int
long_i2c(ASN1_VALUE ** pval,unsigned char * cont,int * putype,const ASN1_ITEM * it)126 long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
127 const ASN1_ITEM *it)
128 {
129 long ltmp;
130 unsigned long utmp;
131 int clen, pad, i;
132 /* this exists to bypass broken gcc optimization */
133 char *cp = (char *)pval;
134
135 /* use memcpy, because we may not be long aligned */
136 memcpy(<mp, cp, sizeof(long));
137
138 if (ltmp == it->size)
139 return -1;
140 /* Convert the long to positive: we subtract one if negative so
141 * we can cleanly handle the padding if only the MSB of the leading
142 * octet is set.
143 */
144 if (ltmp < 0)
145 utmp = -(ltmp + 1);
146 else
147 utmp = ltmp;
148 clen = BN_num_bits_word(utmp);
149 /* If MSB of leading octet set we need to pad */
150 if (!(clen & 0x7))
151 pad = 1;
152 else
153 pad = 0;
154
155 /* Convert number of bits to number of octets */
156 clen = (clen + 7) >> 3;
157
158 if (cont) {
159 if (pad)
160 *cont++ = (ltmp < 0) ? 0xff : 0;
161 for (i = clen - 1; i >= 0; i--) {
162 cont[i] = (unsigned char)(utmp & 0xff);
163 if (ltmp < 0)
164 cont[i] ^= 0xff;
165 utmp >>= 8;
166 }
167 }
168 return clen + pad;
169 }
170
171 static int
long_c2i(ASN1_VALUE ** pval,const unsigned char * cont,int len,int utype,char * free_cont,const ASN1_ITEM * it)172 long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
173 char *free_cont, const ASN1_ITEM *it)
174 {
175 int neg, i;
176 long ltmp;
177 unsigned long utmp = 0;
178 char *cp = (char *)pval;
179 if (len > (int)sizeof(long)) {
180 ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
181 return 0;
182 }
183 /* Is it negative? */
184 if (len && (cont[0] & 0x80))
185 neg = 1;
186 else
187 neg = 0;
188 utmp = 0;
189 for (i = 0; i < len; i++) {
190 utmp <<= 8;
191 if (neg)
192 utmp |= cont[i] ^ 0xff;
193 else
194 utmp |= cont[i];
195 }
196 ltmp = (long)utmp;
197 if (neg) {
198 ltmp = -ltmp;
199 ltmp--;
200 }
201 if (ltmp == it->size) {
202 ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
203 return 0;
204 }
205 memcpy(cp, <mp, sizeof(long));
206 return 1;
207 }
208
209 static int
long_print(BIO * out,ASN1_VALUE ** pval,const ASN1_ITEM * it,int indent,const ASN1_PCTX * pctx)210 long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,
211 const ASN1_PCTX *pctx)
212 {
213 if (BIO_printf(out, "%ld\n", *(long *)pval) <= 0)
214 return 0;
215
216 return 1;
217 }
218