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1 /* crypto/dh/dh_check.c */ | |
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 * All rights reserved. | |
4 * | |
5 * This package is an SSL implementation written | |
6 * by Eric Young (eay@cryptsoft.com). | |
7 * The implementation was written so as to conform with Netscapes SSL. | |
8 * | |
9 * This library is free for commercial and non-commercial use as long as | |
10 * the following conditions are aheared to. The following conditions | |
11 * apply to all code found in this distribution, be it the RC4, RSA, | |
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 * included with this distribution is covered by the same copyright terms | |
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 * | |
16 * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 * the code are not to be removed. | |
18 * If this package is used in a product, Eric Young should be given attribution | |
19 * as the author of the parts of the library used. | |
20 * This can be in the form of a textual message at program startup or | |
21 * in documentation (online or textual) provided with the package. | |
22 * | |
23 * Redistribution and use in source and binary forms, with or without | |
24 * modification, are permitted provided that the following conditions | |
25 * are met: | |
26 * 1. Redistributions of source code must retain the copyright | |
27 * notice, this list of conditions and the following disclaimer. | |
28 * 2. Redistributions in binary form must reproduce the above copyright | |
29 * notice, this list of conditions and the following disclaimer in the | |
30 * documentation and/or other materials provided with the distribution. | |
31 * 3. All advertising materials mentioning features or use of this software | |
32 * must display the following acknowledgement: | |
33 * "This product includes cryptographic software written by | |
34 * Eric Young (eay@cryptsoft.com)" | |
35 * The word 'cryptographic' can be left out if the rouines from the library | |
36 * being used are not cryptographic related :-). | |
37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 * the apps directory (application code) you must include an acknowledgement: | |
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 * | |
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 * SUCH DAMAGE. | |
52 * | |
53 * The licence and distribution terms for any publically available version or | |
54 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 * copied and put under another distribution licence | |
56 * [including the GNU Public Licence.] | |
57 */ | |
58 | |
59 #include <stdio.h> | |
60 #include <openssl/bn.h> | |
61 #include <openssl/dh.h> | |
62 #include <openssl/err.h> | |
63 #include <openssl/fips.h> | |
64 | |
65 /* Check that p is a safe prime and | |
66 * if g is 2, 3 or 5, check that is is a suitable generator | |
67 * where | |
68 * for 2, p mod 24 == 11 | |
69 * for 3, p mod 12 == 5 | |
70 * for 5, p mod 10 == 3 or 7 | |
71 * should hold. | |
72 */ | |
73 | |
74 #ifdef OPENSSL_FIPS | |
75 | |
76 int DH_check(const DH *dh, int *ret) | |
77 { | |
78 int ok=0; | |
79 BN_CTX *ctx=NULL; | |
80 BN_ULONG l; | |
81 BIGNUM *q=NULL; | |
82 | |
83 *ret=0; | |
84 ctx=BN_CTX_new(); | |
85 if (ctx == NULL) goto err; | |
86 q=BN_new(); | |
87 if (q == NULL) goto err; | |
88 | |
89 if (BN_is_word(dh->g,DH_GENERATOR_2)) | |
90 { | |
91 l=BN_mod_word(dh->p,24); | |
92 if (l != 11) *ret|=DH_NOT_SUITABLE_GENERATOR; | |
93 } | |
94 #if 0 | |
95 else if (BN_is_word(dh->g,DH_GENERATOR_3)) | |
96 { | |
97 l=BN_mod_word(dh->p,12); | |
98 if (l != 5) *ret|=DH_NOT_SUITABLE_GENERATOR; | |
99 } | |
100 #endif | |
101 else if (BN_is_word(dh->g,DH_GENERATOR_5)) | |
102 { | |
103 l=BN_mod_word(dh->p,10); | |
104 if ((l != 3) && (l != 7)) | |
105 *ret|=DH_NOT_SUITABLE_GENERATOR; | |
106 } | |
107 else | |
108 *ret|=DH_UNABLE_TO_CHECK_GENERATOR; | |
109 | |
110 if (!BN_is_prime_ex(dh->p,BN_prime_checks,ctx,NULL)) | |
111 *ret|=DH_CHECK_P_NOT_PRIME; | |
112 else | |
113 { | |
114 if (!BN_rshift1(q,dh->p)) goto err; | |
115 if (!BN_is_prime_ex(q,BN_prime_checks,ctx,NULL)) | |
116 *ret|=DH_CHECK_P_NOT_SAFE_PRIME; | |
117 } | |
118 ok=1; | |
119 err: | |
120 if (ctx != NULL) BN_CTX_free(ctx); | |
121 if (q != NULL) BN_free(q); | |
122 return(ok); | |
123 } | |
124 | |
125 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret) | |
126 { | |
127 int ok=0; | |
128 BIGNUM *q=NULL; | |
129 | |
130 *ret=0; | |
131 q=BN_new(); | |
132 if (q == NULL) goto err; | |
133 BN_set_word(q,1); | |
134 if (BN_cmp(pub_key,q) <= 0) | |
135 *ret|=DH_CHECK_PUBKEY_TOO_SMALL; | |
136 BN_copy(q,dh->p); | |
137 BN_sub_word(q,1); | |
138 if (BN_cmp(pub_key,q) >= 0) | |
139 *ret|=DH_CHECK_PUBKEY_TOO_LARGE; | |
140 | |
141 ok = 1; | |
142 err: | |
143 if (q != NULL) BN_free(q); | |
144 return(ok); | |
145 } | |
146 | |
147 #endif | |
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