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9d6b1ce6 | 1 | /* x_bignum.c */ |
ae5c8664 MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2000. | |
e76f935e DSH |
5 | */ |
6 | /* ==================================================================== | |
9d6b1ce6 | 7 | * Copyright (c) 2000 The OpenSSL Project. All rights reserved. |
e76f935e DSH |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
ae5c8664 | 14 | * notice, this list of conditions and the following disclaimer. |
e76f935e DSH |
15 | * |
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 | |
19 | * distribution. | |
20 | * | |
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/)" | |
25 | * | |
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. | |
30 | * | |
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. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
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 | * ==================================================================== | |
53 | * | |
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). | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <stdio.h> | |
61 | #include "cryptlib.h" | |
9d6b1ce6 | 62 | #include <openssl/asn1t.h> |
0f814687 | 63 | #include <openssl/bn.h> |
e76f935e | 64 | |
ae5c8664 MC |
65 | /* |
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. | |
e76f935e DSH |
70 | */ |
71 | ||
ae5c8664 | 72 | #define BN_SENSITIVE 1 |
e76f935e | 73 | |
9d6b1ce6 DSH |
74 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); |
75 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); | |
e76f935e | 76 | |
ae5c8664 MC |
77 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, |
78 | const ASN1_ITEM *it); | |
79 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, | |
80 | int utype, char *free_cont, const ASN1_ITEM *it); | |
e76f935e | 81 | |
9d6b1ce6 | 82 | static ASN1_PRIMITIVE_FUNCS bignum_pf = { |
ae5c8664 MC |
83 | NULL, 0, |
84 | bn_new, | |
85 | bn_free, | |
86 | 0, | |
87 | bn_c2i, | |
88 | bn_i2c | |
9d6b1ce6 | 89 | }; |
e76f935e | 90 | |
bb5ea36b | 91 | ASN1_ITEM_start(BIGNUM) |
ae5c8664 | 92 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" |
d339187b | 93 | ASN1_ITEM_end(BIGNUM) |
bb5ea36b DSH |
94 | |
95 | ASN1_ITEM_start(CBIGNUM) | |
ae5c8664 | 96 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" |
d339187b | 97 | ASN1_ITEM_end(CBIGNUM) |
9d6b1ce6 DSH |
98 | |
99 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
100 | { | |
6fff54b0 DSH |
101 | *pval = (ASN1_VALUE *)BN_new(); |
102 | if (*pval) | |
103 | return 1; | |
104 | else | |
105 | return 0; | |
9d6b1ce6 DSH |
106 | } |
107 | ||
108 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
109 | { | |
6fff54b0 DSH |
110 | if (!*pval) |
111 | return; | |
112 | if (it->size & BN_SENSITIVE) | |
113 | BN_clear_free((BIGNUM *)*pval); | |
114 | else | |
115 | BN_free((BIGNUM *)*pval); | |
116 | *pval = NULL; | |
9d6b1ce6 | 117 | } |
e76f935e | 118 | |
6fff54b0 DSH |
119 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, |
120 | const ASN1_ITEM *it) | |
e76f935e | 121 | { |
6fff54b0 DSH |
122 | BIGNUM *bn; |
123 | int pad; | |
124 | if (!*pval) | |
125 | return -1; | |
126 | bn = (BIGNUM *)*pval; | |
127 | /* If MSB set in an octet we need a padding byte */ | |
128 | if (BN_num_bits(bn) & 0x7) | |
129 | pad = 0; | |
130 | else | |
131 | pad = 1; | |
132 | if (cont) { | |
133 | if (pad) | |
134 | *cont++ = 0; | |
135 | BN_bn2bin(bn, cont); | |
136 | } | |
137 | return pad + BN_num_bytes(bn); | |
e76f935e DSH |
138 | } |
139 | ||
875a644a | 140 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
ae5c8664 | 141 | int utype, char *free_cont, const ASN1_ITEM *it) |
e76f935e | 142 | { |
6fff54b0 DSH |
143 | BIGNUM *bn; |
144 | if (!*pval) | |
145 | bn_new(pval, it); | |
146 | bn = (BIGNUM *)*pval; | |
147 | if (!BN_bin2bn(cont, len, bn)) { | |
148 | bn_free(pval, it); | |
149 | return 0; | |
150 | } | |
151 | return 1; | |
e76f935e | 152 | } |