2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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)
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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).
60 #include "internal/cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/bn.h>
65 * Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER
66 * as a BIGNUM directly. Currently it ignores the sign which isn't a problem
67 * since all BIGNUMs used are non negative and anything that looks negative
68 * is normally due to an encoding error.
71 #define BN_SENSITIVE 1
73 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
74 static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
75 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
77 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
79 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
80 int utype, char *free_cont, const ASN1_ITEM *it);
81 static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
82 int utype, char *free_cont, const ASN1_ITEM *it);
84 static ASN1_PRIMITIVE_FUNCS bignum_pf = {
93 static ASN1_PRIMITIVE_FUNCS cbignum_pf = {
102 ASN1_ITEM_start(BIGNUM)
103 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
104 ASN1_ITEM_end(BIGNUM)
106 ASN1_ITEM_start(CBIGNUM)
107 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &cbignum_pf, BN_SENSITIVE, "CBIGNUM"
108 ASN1_ITEM_end(CBIGNUM)
110 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
112 *pval = (ASN1_VALUE *)BN_new();
119 static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
121 *pval = (ASN1_VALUE *)BN_secure_new();
128 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
132 if (it->size & BN_SENSITIVE)
133 BN_clear_free((BIGNUM *)*pval);
135 BN_free((BIGNUM *)*pval);
139 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
146 bn = (BIGNUM *)*pval;
147 /* If MSB set in an octet we need a padding byte */
148 if (BN_num_bits(bn) & 0x7)
157 return pad + BN_num_bytes(bn);
160 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
161 int utype, char *free_cont, const ASN1_ITEM *it)
165 if (*pval == NULL && !bn_new(pval, it))
167 bn = (BIGNUM *)*pval;
168 if (!BN_bin2bn(cont, len, bn)) {
175 static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
176 int utype, char *free_cont, const ASN1_ITEM *it)
179 bn_secure_new(pval, it);
180 return bn_c2i(pval, cont, len, utype, free_cont, it);