1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/asn1.h>
58
59 #include <string.h>
60
61 #include <openssl/asn1t.h>
62 #include <openssl/bn.h>
63 #include <openssl/err.h>
64 #include <openssl/mem.h>
65
66
67 /* Custom primitive type for long handling. This converts between an ASN1_INTEGER
68 * and a long directly.
69 */
70
71
72 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
73 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
74
75 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
76 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
77 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
78
79 static const ASN1_PRIMITIVE_FUNCS long_pf = {
80 NULL, 0,
81 long_new,
82 long_free,
83 long_free, /* Clear should set to initial value */
84 long_c2i,
85 long_i2c,
86 long_print
87 };
88
ASN1_ITEM_start(LONG)89 ASN1_ITEM_start(LONG)
90 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
91 ASN1_ITEM_end(LONG)
92
93 ASN1_ITEM_start(ZLONG)
94 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
95 ASN1_ITEM_end(ZLONG)
96
97 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
98 {
99 *(long *)pval = it->size;
100 return 1;
101 }
102
long_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)103 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
104 {
105 *(long *)pval = it->size;
106 }
107
long_i2c(ASN1_VALUE ** pval,unsigned char * cont,int * putype,const ASN1_ITEM * it)108 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
109 {
110 long ltmp;
111 unsigned long utmp;
112 int clen, pad, i;
113 /* this exists to bypass broken gcc optimization */
114 char *cp = (char *)pval;
115
116 /* use memcpy, because we may not be long aligned */
117 memcpy(<mp, cp, sizeof(long));
118
119 if(ltmp == it->size) return -1;
120 /* Convert the long to positive: we subtract one if negative so
121 * we can cleanly handle the padding if only the MSB of the leading
122 * octet is set.
123 */
124 if(ltmp < 0) utmp = -ltmp - 1;
125 else utmp = ltmp;
126 clen = BN_num_bits_word(utmp);
127 /* If MSB of leading octet set we need to pad */
128 if(!(clen & 0x7)) pad = 1;
129 else pad = 0;
130
131 /* Convert number of bits to number of octets */
132 clen = (clen + 7) >> 3;
133
134 if(cont) {
135 if(pad) *cont++ = (ltmp < 0) ? 0xff : 0;
136 for(i = clen - 1; i >= 0; i--) {
137 cont[i] = (unsigned char)(utmp & 0xff);
138 if(ltmp < 0) cont[i] ^= 0xff;
139 utmp >>= 8;
140 }
141 }
142 return clen + pad;
143 }
144
long_c2i(ASN1_VALUE ** pval,const unsigned char * cont,int len,int utype,char * free_cont,const ASN1_ITEM * it)145 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
146 int utype, char *free_cont, const ASN1_ITEM *it)
147 {
148 int neg, i;
149 long ltmp;
150 unsigned long utmp = 0;
151 char *cp = (char *)pval;
152 if(len > (int)sizeof(long)) {
153 OPENSSL_PUT_ERROR(ASN1, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
154 return 0;
155 }
156 /* Is it negative? */
157 if(len && (cont[0] & 0x80)) neg = 1;
158 else neg = 0;
159 utmp = 0;
160 for(i = 0; i < len; i++) {
161 utmp <<= 8;
162 if(neg) utmp |= cont[i] ^ 0xff;
163 else utmp |= cont[i];
164 }
165 ltmp = (long)utmp;
166 if(neg) {
167 ltmp++;
168 ltmp = -ltmp;
169 }
170 if(ltmp == it->size) {
171 OPENSSL_PUT_ERROR(ASN1, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
172 return 0;
173 }
174 memcpy(cp, <mp, sizeof(long));
175 return 1;
176 }
177
long_print(BIO * out,ASN1_VALUE ** pval,const ASN1_ITEM * it,int indent,const ASN1_PCTX * pctx)178 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
179 int indent, const ASN1_PCTX *pctx)
180 {
181 return BIO_printf(out, "%ld\n", *(long *)pval);
182 }
183