Line data Source code
1 : /* ssl/s2_enc.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 "ssl_locl.h"
60 : #ifndef OPENSSL_NO_SSL2
61 : # include <stdio.h>
62 :
63 0 : int ssl2_enc_init(SSL *s, int client)
64 : {
65 : /* Max number of bytes needed */
66 : EVP_CIPHER_CTX *rs, *ws;
67 : const EVP_CIPHER *c;
68 : const EVP_MD *md;
69 : int num;
70 :
71 0 : if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) {
72 0 : ssl2_return_error(s, SSL2_PE_NO_CIPHER);
73 0 : SSLerr(SSL_F_SSL2_ENC_INIT, SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
74 0 : return (0);
75 : }
76 0 : ssl_replace_hash(&s->read_hash, md);
77 0 : ssl_replace_hash(&s->write_hash, md);
78 :
79 0 : if ((s->enc_read_ctx == NULL) && ((s->enc_read_ctx = (EVP_CIPHER_CTX *)
80 0 : OPENSSL_malloc(sizeof(EVP_CIPHER_CTX)))
81 : == NULL))
82 : goto err;
83 :
84 : /*
85 : * make sure it's intialized in case the malloc for enc_write_ctx fails
86 : * and we exit with an error
87 : */
88 0 : rs = s->enc_read_ctx;
89 0 : EVP_CIPHER_CTX_init(rs);
90 :
91 0 : if ((s->enc_write_ctx == NULL) && ((s->enc_write_ctx = (EVP_CIPHER_CTX *)
92 0 : OPENSSL_malloc(sizeof
93 : (EVP_CIPHER_CTX))) ==
94 : NULL))
95 : goto err;
96 :
97 0 : ws = s->enc_write_ctx;
98 0 : EVP_CIPHER_CTX_init(ws);
99 :
100 0 : num = c->key_len;
101 0 : s->s2->key_material_length = num * 2;
102 0 : OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material);
103 :
104 0 : if (ssl2_generate_key_material(s) <= 0)
105 : return 0;
106 :
107 0 : OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg));
108 0 : EVP_EncryptInit_ex(ws, c, NULL,
109 0 : &(s->s2->key_material[(client) ? num : 0]),
110 0 : s->session->key_arg);
111 0 : EVP_DecryptInit_ex(rs, c, NULL,
112 0 : &(s->s2->key_material[(client) ? 0 : num]),
113 0 : s->session->key_arg);
114 0 : s->s2->read_key = &(s->s2->key_material[(client) ? 0 : num]);
115 0 : s->s2->write_key = &(s->s2->key_material[(client) ? num : 0]);
116 0 : return (1);
117 : err:
118 0 : SSLerr(SSL_F_SSL2_ENC_INIT, ERR_R_MALLOC_FAILURE);
119 0 : return (0);
120 : }
121 :
122 : /*
123 : * read/writes from s->s2->mac_data using length for encrypt and decrypt.
124 : * It sets s->s2->padding and s->[rw]length if we are encrypting Returns 0 on
125 : * error and 1 on success
126 : */
127 0 : int ssl2_enc(SSL *s, int send)
128 : {
129 : EVP_CIPHER_CTX *ds;
130 : unsigned long l;
131 : int bs;
132 :
133 0 : if (send) {
134 0 : ds = s->enc_write_ctx;
135 0 : l = s->s2->wlength;
136 : } else {
137 0 : ds = s->enc_read_ctx;
138 0 : l = s->s2->rlength;
139 : }
140 :
141 : /* check for NULL cipher */
142 0 : if (ds == NULL)
143 : return 1;
144 :
145 0 : bs = ds->cipher->block_size;
146 : /*
147 : * This should be using (bs-1) and bs instead of 7 and 8, but what the
148 : * hell.
149 : */
150 0 : if (bs == 8)
151 0 : l = (l + 7) / 8 * 8;
152 :
153 0 : if (EVP_Cipher(ds, s->s2->mac_data, s->s2->mac_data, l) < 1)
154 : return 0;
155 :
156 0 : return 1;
157 : }
158 :
159 0 : void ssl2_mac(SSL *s, unsigned char *md, int send)
160 : {
161 : EVP_MD_CTX c;
162 : unsigned char sequence[4], *p, *sec, *act;
163 : unsigned long seq;
164 : unsigned int len;
165 :
166 0 : if (send) {
167 0 : seq = s->s2->write_sequence;
168 0 : sec = s->s2->write_key;
169 0 : len = s->s2->wact_data_length;
170 0 : act = s->s2->wact_data;
171 : } else {
172 0 : seq = s->s2->read_sequence;
173 0 : sec = s->s2->read_key;
174 0 : len = s->s2->ract_data_length;
175 0 : act = s->s2->ract_data;
176 : }
177 :
178 : p = &(sequence[0]);
179 0 : l2n(seq, p);
180 :
181 : /* There has to be a MAC algorithm. */
182 0 : EVP_MD_CTX_init(&c);
183 0 : EVP_MD_CTX_copy(&c, s->read_hash);
184 0 : EVP_DigestUpdate(&c, sec, EVP_CIPHER_CTX_key_length(s->enc_read_ctx));
185 0 : EVP_DigestUpdate(&c, act, len);
186 : /* the above line also does the pad data */
187 0 : EVP_DigestUpdate(&c, sequence, 4);
188 0 : EVP_DigestFinal_ex(&c, md, NULL);
189 0 : EVP_MD_CTX_cleanup(&c);
190 0 : }
191 : #else /* !OPENSSL_NO_SSL2 */
192 :
193 : # if PEDANTIC
194 : static void *dummy = &dummy;
195 : # endif
196 :
197 : #endif
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