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 <openssl/asn1t.h>
60#include <openssl/bn.h>
61#include <openssl/err.h>
62#include <openssl/mem.h>
63
64
65/* Custom primitive type for long handling. This converts between an ASN1_INTEGER
66 * and a long directly.
67 */
68
69
70static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
71static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
72
73static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
74static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
75static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
76
77static ASN1_PRIMITIVE_FUNCS long_pf = {
78	NULL, 0,
79	long_new,
80	long_free,
81	long_free,	/* Clear should set to initial value */
82	long_c2i,
83	long_i2c,
84	long_print
85};
86
87ASN1_ITEM_start(LONG)
88	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
89ASN1_ITEM_end(LONG)
90
91ASN1_ITEM_start(ZLONG)
92	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
93ASN1_ITEM_end(ZLONG)
94
95static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
96{
97	*(long *)pval = it->size;
98	return 1;
99}
100
101static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
102{
103	*(long *)pval = it->size;
104}
105
106static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
107{
108	long ltmp;
109	unsigned long utmp;
110	int clen, pad, i;
111	/* this exists to bypass broken gcc optimization */
112	char *cp = (char *)pval;
113
114	/* use memcpy, because we may not be long aligned */
115	memcpy(&ltmp, cp, sizeof(long));
116
117	if(ltmp == it->size) return -1;
118	/* Convert the long to positive: we subtract one if negative so
119	 * we can cleanly handle the padding if only the MSB of the leading
120	 * octet is set.
121	 */
122	if(ltmp < 0) utmp = -ltmp - 1;
123	else utmp = ltmp;
124	clen = BN_num_bits_word(utmp);
125	/* If MSB of leading octet set we need to pad */
126	if(!(clen & 0x7)) pad = 1;
127	else pad = 0;
128
129	/* Convert number of bits to number of octets */
130	clen = (clen + 7) >> 3;
131
132	if(cont) {
133		if(pad) *cont++ = (ltmp < 0) ? 0xff : 0;
134		for(i = clen - 1; i >= 0; i--) {
135			cont[i] = (unsigned char)(utmp & 0xff);
136			if(ltmp < 0) cont[i] ^= 0xff;
137			utmp >>= 8;
138		}
139	}
140	return clen + pad;
141}
142
143static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
144		    int utype, char *free_cont, const ASN1_ITEM *it)
145{
146	int neg, i;
147	long ltmp;
148	unsigned long utmp = 0;
149	char *cp = (char *)pval;
150	if(len > (int)sizeof(long)) {
151		OPENSSL_PUT_ERROR(ASN1, long_c2i,  ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
152		return 0;
153	}
154	/* Is it negative? */
155	if(len && (cont[0] & 0x80)) neg = 1;
156	else neg = 0;
157	utmp = 0;
158	for(i = 0; i < len; i++) {
159		utmp <<= 8;
160		if(neg) utmp |= cont[i] ^ 0xff;
161		else utmp |= cont[i];
162	}
163	ltmp = (long)utmp;
164	if(neg) {
165		ltmp++;
166		ltmp = -ltmp;
167	}
168	if(ltmp == it->size) {
169		OPENSSL_PUT_ERROR(ASN1, long_c2i,  ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
170		return 0;
171	}
172	memcpy(cp, &ltmp, sizeof(long));
173	return 1;
174}
175
176static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
177			int indent, const ASN1_PCTX *pctx)
178	{
179	return BIO_printf(out, "%ld\n", *(long *)pval);
180	}
181