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d02b48c6 | 1 | /* ssl/s2_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
d02b48c6 | 59 | #include "ssl_locl.h" |
bc36ee62 | 60 | #ifndef OPENSSL_NO_SSL2 |
aa82db4f | 61 | #include <stdio.h> |
d02b48c6 | 62 | |
6b691a5c | 63 | int ssl2_enc_init(SSL *s, int client) |
d02b48c6 RE |
64 | { |
65 | /* Max number of bytes needed */ | |
66 | EVP_CIPHER_CTX *rs,*ws; | |
e778802f BL |
67 | const EVP_CIPHER *c; |
68 | const EVP_MD *md; | |
d02b48c6 RE |
69 | int num; |
70 | ||
413c4f45 | 71 | if (!ssl_cipher_get_evp(s->session,&c,&md,NULL)) |
d02b48c6 RE |
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 *) | |
26a3a48d | 83 | OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) |
d02b48c6 RE |
84 | goto err; |
85 | if ((s->enc_write_ctx == NULL) && | |
86 | ((s->enc_write_ctx=(EVP_CIPHER_CTX *) | |
26a3a48d | 87 | OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) |
d02b48c6 RE |
88 | goto err; |
89 | ||
90 | rs= s->enc_read_ctx; | |
91 | ws= s->enc_write_ctx; | |
92 | ||
58964a49 RE |
93 | EVP_CIPHER_CTX_init(rs); |
94 | EVP_CIPHER_CTX_init(ws); | |
95 | ||
d02b48c6 RE |
96 | num=c->key_len; |
97 | s->s2->key_material_length=num*2; | |
98 | ||
99 | ssl2_generate_key_material(s); | |
100 | ||
101 | EVP_EncryptInit(ws,c,&(s->s2->key_material[(client)?num:0]), | |
102 | s->session->key_arg); | |
103 | EVP_DecryptInit(rs,c,&(s->s2->key_material[(client)?0:num]), | |
104 | s->session->key_arg); | |
105 | s->s2->read_key= &(s->s2->key_material[(client)?0:num]); | |
106 | s->s2->write_key= &(s->s2->key_material[(client)?num:0]); | |
107 | return(1); | |
108 | err: | |
109 | SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); | |
110 | return(0); | |
111 | } | |
112 | ||
113 | /* read/writes from s->s2->mac_data using length for encrypt and | |
114 | * decrypt. It sets the s->s2->padding, s->[rw]length and | |
115 | * s->s2->pad_data ptr if we are encrypting */ | |
6b691a5c | 116 | void ssl2_enc(SSL *s, int send) |
d02b48c6 RE |
117 | { |
118 | EVP_CIPHER_CTX *ds; | |
119 | unsigned long l; | |
120 | int bs; | |
121 | ||
122 | if (send) | |
123 | { | |
124 | ds=s->enc_write_ctx; | |
125 | l=s->s2->wlength; | |
126 | } | |
127 | else | |
128 | { | |
129 | ds=s->enc_read_ctx; | |
130 | l=s->s2->rlength; | |
131 | } | |
132 | ||
133 | /* check for NULL cipher */ | |
134 | if (ds == NULL) return; | |
135 | ||
136 | ||
137 | bs=ds->cipher->block_size; | |
138 | /* This should be using (bs-1) and bs instead of 7 and 8, but | |
139 | * what the hell. */ | |
140 | if (bs == 8) | |
141 | l=(l+7)/8*8; | |
142 | ||
143 | EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); | |
144 | } | |
145 | ||
6b691a5c | 146 | void ssl2_mac(SSL *s, unsigned char *md, int send) |
d02b48c6 RE |
147 | { |
148 | EVP_MD_CTX c; | |
149 | unsigned char sequence[4],*p,*sec,*act; | |
150 | unsigned long seq; | |
151 | unsigned int len; | |
152 | ||
153 | if (send) | |
154 | { | |
155 | seq=s->s2->write_sequence; | |
156 | sec=s->s2->write_key; | |
157 | len=s->s2->wact_data_length; | |
158 | act=s->s2->wact_data; | |
159 | } | |
160 | else | |
161 | { | |
162 | seq=s->s2->read_sequence; | |
163 | sec=s->s2->read_key; | |
164 | len=s->s2->ract_data_length; | |
165 | act=s->s2->ract_data; | |
166 | } | |
167 | ||
168 | p= &(sequence[0]); | |
169 | l2n(seq,p); | |
170 | ||
171 | /* There has to be a MAC algorithm. */ | |
172 | EVP_DigestInit(&c,s->read_hash); | |
173 | EVP_DigestUpdate(&c,sec, | |
174 | EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); | |
175 | EVP_DigestUpdate(&c,act,len); | |
176 | /* the above line also does the pad data */ | |
177 | EVP_DigestUpdate(&c,sequence,4); | |
178 | EVP_DigestFinal(&c,md,NULL); | |
179 | /* some would say I should zero the md context */ | |
180 | } | |
bc36ee62 | 181 | #else /* !OPENSSL_NO_SSL2 */ |
aa82db4f UM |
182 | |
183 | # if PEDANTIC | |
184 | static void *dummy=&dummy; | |
185 | # endif | |
d02b48c6 | 186 | |
aa82db4f | 187 | #endif |