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9d6b1ce6 | 1 | /* x_bignum.c */ |
2e597528 | 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
9d6b1ce6 | 3 | * project 2000. |
e76f935e DSH |
4 | */ |
5 | /* ==================================================================== | |
9d6b1ce6 | 6 | * Copyright (c) 2000 The OpenSSL Project. All rights reserved. |
e76f935e DSH |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
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 | |
18 | * distribution. | |
19 | * | |
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/)" | |
24 | * | |
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. | |
29 | * | |
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. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
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 | * ==================================================================== | |
52 | * | |
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). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
9d6b1ce6 | 61 | #include <openssl/asn1t.h> |
0f814687 | 62 | #include <openssl/bn.h> |
e76f935e | 63 | |
9d6b1ce6 DSH |
64 | /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a |
65 | * BIGNUM directly. Currently it ignores the sign which isn't a problem since all | |
66 | * BIGNUMs used are non negative and anything that looks negative is normally due | |
67 | * to an encoding error. | |
e76f935e DSH |
68 | */ |
69 | ||
9d6b1ce6 | 70 | #define BN_SENSITIVE 1 |
e76f935e | 71 | |
9d6b1ce6 DSH |
72 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); |
73 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); | |
e76f935e | 74 | |
9d6b1ce6 | 75 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); |
875a644a | 76 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); |
e76f935e | 77 | |
9d6b1ce6 DSH |
78 | static ASN1_PRIMITIVE_FUNCS bignum_pf = { |
79 | NULL, 0, | |
80 | bn_new, | |
81 | bn_free, | |
82 | 0, | |
83 | bn_c2i, | |
84 | bn_i2c | |
85 | }; | |
e76f935e | 86 | |
bb5ea36b DSH |
87 | ASN1_ITEM_start(BIGNUM) |
88 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" | |
d339187b | 89 | ASN1_ITEM_end(BIGNUM) |
bb5ea36b DSH |
90 | |
91 | ASN1_ITEM_start(CBIGNUM) | |
92 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" | |
d339187b | 93 | ASN1_ITEM_end(CBIGNUM) |
9d6b1ce6 DSH |
94 | |
95 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
96 | { | |
97 | *pval = (ASN1_VALUE *)BN_new(); | |
98 | if(*pval) return 1; | |
99 | else return 0; | |
100 | } | |
101 | ||
102 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
103 | { | |
104 | if(!*pval) return; | |
105 | if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval); | |
106 | else BN_free((BIGNUM *)*pval); | |
107 | *pval = NULL; | |
108 | } | |
e76f935e | 109 | |
9d6b1ce6 | 110 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) |
e76f935e | 111 | { |
9d6b1ce6 DSH |
112 | BIGNUM *bn; |
113 | int pad; | |
114 | if(!*pval) return -1; | |
115 | bn = (BIGNUM *)*pval; | |
116 | /* If MSB set in an octet we need a padding byte */ | |
117 | if(BN_num_bits(bn) & 0x7) pad = 0; | |
118 | else pad = 1; | |
119 | if(cont) { | |
120 | if(pad) *cont++ = 0; | |
121 | BN_bn2bin(bn, cont); | |
122 | } | |
123 | return pad + BN_num_bytes(bn); | |
e76f935e DSH |
124 | } |
125 | ||
875a644a RL |
126 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
127 | int utype, char *free_cont, const ASN1_ITEM *it) | |
e76f935e | 128 | { |
9d6b1ce6 DSH |
129 | BIGNUM *bn; |
130 | if(!*pval) bn_new(pval, it); | |
131 | bn = (BIGNUM *)*pval; | |
132 | if(!BN_bin2bn(cont, len, bn)) { | |
133 | bn_free(pval, it); | |
134 | return 0; | |
135 | } | |
136 | return 1; | |
e76f935e | 137 | } |
9d6b1ce6 DSH |
138 | |
139 |