2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
61 #include <openssl/asn1t.h>
63 /* Custom primitive type for long handling. This converts between an ASN1_INTEGER
64 * and a long directly.
68 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
69 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
71 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
72 static int long_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
74 static ASN1_PRIMITIVE_FUNCS long_pf = {
78 long_free, /* Clear should set to initial value */
83 const ASN1_ITEM LONG_it = { ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"};
84 const ASN1_ITEM ZLONG_it = { ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"};
86 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
88 *(long *)pval = it->size;
92 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
94 *(long *)pval = it->size;
97 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
102 ltmp = *(long *)pval;
103 if(ltmp == it->size) return -1;
104 /* Convert the long to positive: we subtract one if negative so
105 * we can cleanly handle the padding if only the MSB of the leading
108 if(ltmp < 0) utmp = -ltmp - 1;
110 clen = BN_num_bits_word(utmp);
111 /* If MSB of leading octet set we need to pad */
112 if(!(clen & 0x7)) pad = 1;
115 /* Convert number of bits to number of octets */
116 clen = (clen + 7) >> 3;
119 if(pad) *cont++ = (ltmp < 0) ? 0xff : 0;
120 for(i = clen - 1; i >= 0; i--) {
121 cont[i] = (unsigned char)(utmp & 0xff);
122 if(ltmp < 0) cont[i] ^= 0xff;
129 static int long_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
133 unsigned long utmp = 0;
134 if(len > sizeof(long)) {
135 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
138 /* Is it negative? */
139 if(len && (cont[0] & 0x80)) neg = 1;
142 for(i = 0; i < len; i++) {
144 if(neg) utmp |= cont[i] ^ 0xff;
145 else utmp |= cont[i];
152 if(ltmp == it->size) {
153 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
156 *(long *)pval = ltmp;