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
_krb5_xor(DES_cblock * key,const unsigned char * b)43 _krb5_xor (DES_cblock *key, const unsigned char *b)
44 {
45 unsigned char *a = (unsigned char*)key;
46 a[0] ^= b[0];
47 a[1] ^= b[1];
48 a[2] ^= b[2];
49 a[3] ^= b[3];
50 a[4] ^= b[4];
51 a[5] ^= b[5];
52 a[6] ^= b[6];
53 a[7] ^= b[7];
54 }
55
56 #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
57 krb5_error_code
_krb5_des_checksum(krb5_context context,const EVP_MD * evp_md,struct _krb5_key_data * key,const void * data,size_t len,Checksum * cksum)58 _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 struct _krb5_evp_schedule *ctx = key->schedule->data;
66 EVP_MD_CTX *m;
67 DES_cblock ivec;
68 unsigned char *p = cksum->checksum.data;
69
70 krb5_generate_random_block(p, 8);
71
72 m = EVP_MD_CTX_create();
73 if (m == NULL) {
74 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
75 return ENOMEM;
76 }
77
78 EVP_DigestInit_ex(m, evp_md, NULL);
79 EVP_DigestUpdate(m, p, 8);
80 EVP_DigestUpdate(m, data, len);
81 EVP_DigestFinal_ex (m, p + 8, NULL);
82 EVP_MD_CTX_destroy(m);
83 memset (&ivec, 0, sizeof(ivec));
84 EVP_CipherInit_ex(ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
85 EVP_Cipher(ctx->ectx, p, p, 24);
86
87 return 0;
88 }
89
90 krb5_error_code
_krb5_des_verify(krb5_context context,const EVP_MD * evp_md,struct _krb5_key_data * key,const void * data,size_t len,Checksum * C)91 _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 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 krb5_error_code ret = 0;
104
105 m = EVP_MD_CTX_create();
106 if (m == NULL) {
107 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
108 return ENOMEM;
109 }
110
111 memset(&ivec, 0, sizeof(ivec));
112 EVP_CipherInit_ex(ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
113 EVP_Cipher(ctx->dctx, tmp, C->checksum.data, 24);
114
115 EVP_DigestInit_ex(m, evp_md, NULL);
116 EVP_DigestUpdate(m, tmp, 8); /* confounder */
117 EVP_DigestUpdate(m, data, len);
118 EVP_DigestFinal_ex (m, res, NULL);
119 EVP_MD_CTX_destroy(m);
120 if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
121 krb5_clear_error_message (context);
122 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
123 }
124 memset(tmp, 0, sizeof(tmp));
125 memset(res, 0, sizeof(res));
126 return ret;
127 }
128
129 #endif
130
131 static krb5_error_code
RSA_MD5_checksum(krb5_context context,struct _krb5_key_data * key,const void * data,size_t len,unsigned usage,Checksum * C)132 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 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
140 krb5_abortx(context, "md5 checksum failed");
141 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 };
153