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