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