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 : KRB5_LIB_FUNCTION void KRB5_LIB_CALL
43 0 : _krb5_xor8(unsigned char *a, const unsigned char *b)
44 : {
45 0 : a[0] ^= b[0];
46 0 : a[1] ^= b[1];
47 0 : a[2] ^= b[2];
48 0 : a[3] ^= b[3];
49 0 : a[4] ^= b[4];
50 0 : a[5] ^= b[5];
51 0 : a[6] ^= b[6];
52 0 : a[7] ^= b[7];
53 0 : }
54 :
55 : #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
56 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
57 0 : _krb5_des_checksum(krb5_context context,
58 : const EVP_MD *evp_md,
59 : struct _krb5_key_data *key,
60 : const struct krb5_crypto_iov *iov,
61 : int niov,
62 : Checksum *cksum)
63 : {
64 0 : struct _krb5_evp_schedule *ctx = key->schedule->data;
65 0 : EVP_MD_CTX *m;
66 0 : DES_cblock ivec;
67 0 : int i;
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 : return krb5_enomem(context);
75 :
76 0 : EVP_DigestInit_ex(m, evp_md, NULL);
77 0 : EVP_DigestUpdate(m, p, 8);
78 0 : for (i = 0; i < niov; i++) {
79 0 : if (_krb5_crypto_iov_should_sign(&iov[i]))
80 0 : EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
81 : }
82 0 : EVP_DigestFinal_ex (m, p + 8, NULL);
83 0 : EVP_MD_CTX_destroy(m);
84 0 : memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
85 0 : EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
86 0 : EVP_Cipher(&ctx->ectx, p, p, 24);
87 :
88 0 : return 0;
89 : }
90 :
91 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
92 0 : _krb5_des_verify(krb5_context context,
93 : const EVP_MD *evp_md,
94 : struct _krb5_key_data *key,
95 : const struct krb5_crypto_iov *iov,
96 : int niov,
97 : Checksum *C)
98 : {
99 0 : struct _krb5_evp_schedule *ctx = key->schedule->data;
100 0 : EVP_MD_CTX *m;
101 0 : unsigned char tmp[24];
102 0 : unsigned char res[16];
103 0 : DES_cblock ivec;
104 0 : krb5_error_code ret = 0;
105 0 : int i;
106 :
107 0 : m = EVP_MD_CTX_create();
108 0 : if (m == NULL)
109 0 : return krb5_enomem(context);
110 :
111 0 : memset_s(&ivec, sizeof(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 : for (i = 0; i < niov; i++) {
118 0 : if (_krb5_crypto_iov_should_sign(&iov[i]))
119 0 : EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
120 : }
121 0 : EVP_DigestFinal_ex (m, res, NULL);
122 0 : EVP_MD_CTX_destroy(m);
123 0 : if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
124 0 : krb5_clear_error_message (context);
125 0 : ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
126 : }
127 0 : memset_s(tmp, sizeof(tmp), 0, sizeof(tmp));
128 0 : memset_s(res, sizeof(res), 0, sizeof(res));
129 0 : return ret;
130 : }
131 :
132 : #endif
133 :
134 : static krb5_error_code
135 2253125 : RSA_MD5_checksum(krb5_context context,
136 : krb5_crypto crypto,
137 : struct _krb5_key_data *key,
138 : unsigned usage,
139 : const struct krb5_crypto_iov *iov,
140 : int niov,
141 : Checksum *C)
142 : {
143 2253125 : if (_krb5_evp_digest_iov(crypto, iov, niov, C->checksum.data,
144 : NULL, EVP_md5(), NULL) != 1)
145 0 : krb5_abortx(context, "md5 checksum failed");
146 :
147 2253125 : return 0;
148 : }
149 :
150 : struct _krb5_checksum_type _krb5_checksum_rsa_md5 = {
151 : CKSUMTYPE_RSA_MD5,
152 : "rsa-md5",
153 : 64,
154 : 16,
155 : F_CPROOF,
156 : RSA_MD5_checksum,
157 : NULL
158 : };
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