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
72static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
73static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
74
75static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
76static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
77static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
78
79static 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
89ASN1_ITEM_start(LONG)
90	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
91ASN1_ITEM_end(LONG)
92
93ASN1_ITEM_start(ZLONG)
94	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
95ASN1_ITEM_end(ZLONG)
96
97static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
98{
99	*(long *)pval = it->size;
100	return 1;
101}
102
103static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
104{
105	*(long *)pval = it->size;
106}
107
108static 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(&ltmp, 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
145static 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, &ltmp, sizeof(long));
175	return 1;
176}
177
178static 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