1 /* $OpenBSD: x_long.c,v 1.14 2019/04/01 15:48:50 jsing Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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,
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46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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).
62 #include <openssl/asn1t.h>
63 #include <openssl/bn.h>
64 #include <openssl/err.h>
67 * Custom primitive type for long handling. This converts between an
68 * ASN1_INTEGER and a long directly.
71 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
72 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
74 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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);
81 static ASN1_PRIMITIVE_FUNCS long_pf = {
85 .prim_free = long_free,
86 .prim_clear = long_free, /* Clear should set to initial value */
89 .prim_print = long_print,
92 const ASN1_ITEM LONG_it = {
93 .itype = ASN1_ITYPE_PRIMITIVE,
94 .utype = V_ASN1_INTEGER,
98 .size = ASN1_LONG_UNDEF,
102 const ASN1_ITEM ZLONG_it = {
103 .itype = ASN1_ITYPE_PRIMITIVE,
104 .utype = V_ASN1_INTEGER,
113 long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
115 *(long *)pval = it->size;
120 long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
122 *(long *)pval = it->size;
126 long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
132 /* this exists to bypass broken gcc optimization */
133 char *cp = (char *)pval;
135 /* use memcpy, because we may not be long aligned */
136 memcpy(<mp, cp, sizeof(long));
138 if (ltmp == it->size)
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
148 clen = BN_num_bits_word(utmp);
149 /* If MSB of leading octet set we need to pad */
155 /* Convert number of bits to number of octets */
156 clen = (clen + 7) >> 3;
160 *cont++ = (ltmp < 0) ? 0xff : 0;
161 for (i = clen - 1; i >= 0; i--) {
162 cont[i] = (unsigned char)(utmp & 0xff);
172 long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
173 char *free_cont, const ASN1_ITEM *it)
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);
183 /* Is it negative? */
184 if (len && (cont[0] & 0x80))
189 for (i = 0; i < len; i++) {
192 utmp |= cont[i] ^ 0xff;
201 if (ltmp == it->size) {
202 ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
205 memcpy(cp, <mp, sizeof(long));
210 long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,
211 const ASN1_PCTX *pctx)
213 if (BIO_printf(out, "%ld\n", *(long *)pval) <= 0)