3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/asn1t.h>
63 #include <openssl/bn.h>
66 * Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER
67 * as a BIGNUM directly. Currently it ignores the sign which isn't a problem
68 * since all BIGNUMs used are non negative and anything that looks negative
69 * is normally due to an encoding error.
72 #define BN_SENSITIVE 1
74 static int bn_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
);
82 static ASN1_PRIMITIVE_FUNCS bignum_pf
= {
91 ASN1_ITEM_start(BIGNUM
)
92 ASN1_ITYPE_PRIMITIVE
, V_ASN1_INTEGER
, NULL
, 0, &bignum_pf
, 0, "BIGNUM"
95 ASN1_ITEM_start(CBIGNUM
)
96 ASN1_ITYPE_PRIMITIVE
, V_ASN1_INTEGER
, NULL
, 0, &bignum_pf
, BN_SENSITIVE
, "BIGNUM"
97 ASN1_ITEM_end(CBIGNUM
)
99 static int bn_new(ASN1_VALUE
**pval
, const ASN1_ITEM
*it
)
101 *pval
= (ASN1_VALUE
*)BN_new();
108 static void bn_free(ASN1_VALUE
**pval
, const ASN1_ITEM
*it
)
112 if (it
->size
& BN_SENSITIVE
)
113 BN_clear_free((BIGNUM
*)*pval
);
115 BN_free((BIGNUM
*)*pval
);
119 static int bn_i2c(ASN1_VALUE
**pval
, unsigned char *cont
, int *putype
,
126 bn
= (BIGNUM
*)*pval
;
127 /* If MSB set in an octet we need a padding byte */
128 if (BN_num_bits(bn
) & 0x7)
137 return pad
+ BN_num_bytes(bn
);
140 static int bn_c2i(ASN1_VALUE
**pval
, const unsigned char *cont
, int len
,
141 int utype
, char *free_cont
, const ASN1_ITEM
*it
)
145 if (*pval
== NULL
&& !bn_new(pval
, it
))
147 bn
= (BIGNUM
*)*pval
;
148 if (!BN_bin2bn(cont
, len
, bn
)) {