Line data Source code
1 : /*
2 : * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions
8 : * are met:
9 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * 3. Neither the name of the Institute nor the names of its contributors
18 : * may be used to endorse or promote products derived from this software
19 : * without specific prior written permission.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : /* Functions which are used by both single and triple DES enctypes */
35 :
36 : #include "krb5_locl.h"
37 :
38 : /*
39 : * A = A xor B. A & B are 8 bytes.
40 : */
41 :
42 : void
43 0 : _krb5_xor (DES_cblock *key, const unsigned char *b)
44 : {
45 0 : unsigned char *a = (unsigned char*)key;
46 0 : a[0] ^= b[0];
47 0 : a[1] ^= b[1];
48 0 : a[2] ^= b[2];
49 0 : a[3] ^= b[3];
50 0 : a[4] ^= b[4];
51 0 : a[5] ^= b[5];
52 0 : a[6] ^= b[6];
53 0 : a[7] ^= b[7];
54 0 : }
55 :
56 : #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
57 : krb5_error_code
58 0 : _krb5_des_checksum(krb5_context context,
59 : const EVP_MD *evp_md,
60 : struct _krb5_key_data *key,
61 : const void *data,
62 : size_t len,
63 : Checksum *cksum)
64 : {
65 0 : struct _krb5_evp_schedule *ctx = key->schedule->data;
66 : EVP_MD_CTX *m;
67 : DES_cblock ivec;
68 0 : unsigned char *p = cksum->checksum.data;
69 :
70 0 : krb5_generate_random_block(p, 8);
71 :
72 0 : m = EVP_MD_CTX_create();
73 0 : if (m == NULL) {
74 0 : krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
75 0 : return ENOMEM;
76 : }
77 :
78 0 : EVP_DigestInit_ex(m, evp_md, NULL);
79 0 : EVP_DigestUpdate(m, p, 8);
80 0 : EVP_DigestUpdate(m, data, len);
81 0 : EVP_DigestFinal_ex (m, p + 8, NULL);
82 0 : EVP_MD_CTX_destroy(m);
83 0 : memset (&ivec, 0, sizeof(ivec));
84 0 : EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
85 0 : EVP_Cipher(&ctx->ectx, p, p, 24);
86 :
87 0 : return 0;
88 : }
89 :
90 : krb5_error_code
91 0 : _krb5_des_verify(krb5_context context,
92 : const EVP_MD *evp_md,
93 : struct _krb5_key_data *key,
94 : const void *data,
95 : size_t len,
96 : Checksum *C)
97 : {
98 0 : struct _krb5_evp_schedule *ctx = key->schedule->data;
99 : EVP_MD_CTX *m;
100 : unsigned char tmp[24];
101 : unsigned char res[16];
102 : DES_cblock ivec;
103 0 : krb5_error_code ret = 0;
104 :
105 0 : m = EVP_MD_CTX_create();
106 0 : if (m == NULL) {
107 0 : krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
108 0 : return ENOMEM;
109 : }
110 :
111 0 : memset(&ivec, 0, sizeof(ivec));
112 0 : EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
113 0 : EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
114 :
115 0 : EVP_DigestInit_ex(m, evp_md, NULL);
116 0 : EVP_DigestUpdate(m, tmp, 8); /* confounder */
117 0 : EVP_DigestUpdate(m, data, len);
118 0 : EVP_DigestFinal_ex (m, res, NULL);
119 0 : EVP_MD_CTX_destroy(m);
120 0 : if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
121 0 : krb5_clear_error_message (context);
122 0 : ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
123 : }
124 0 : memset(tmp, 0, sizeof(tmp));
125 0 : memset(res, 0, sizeof(res));
126 0 : return ret;
127 : }
128 :
129 : #endif
130 :
131 : static krb5_error_code
132 1896969 : RSA_MD5_checksum(krb5_context context,
133 : struct _krb5_key_data *key,
134 : const void *data,
135 : size_t len,
136 : unsigned usage,
137 : Checksum *C)
138 : {
139 1896969 : if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
140 0 : krb5_abortx(context, "md5 checksum failed");
141 1896969 : return 0;
142 : }
143 :
144 : struct _krb5_checksum_type _krb5_checksum_rsa_md5 = {
145 : CKSUMTYPE_RSA_MD5,
146 : "rsa-md5",
147 : 64,
148 : 16,
149 : F_CPROOF,
150 : RSA_MD5_checksum,
151 : NULL
152 : };
|
