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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 | ||
59 | #include <stdio.h> | |
60 | #include "ssl_locl.h" | |
61 | ||
d02b48c6 RE |
62 | int ssl2_enc_init(s, client) |
63 | SSL *s; | |
64 | int client; | |
65 | { | |
66 | /* Max number of bytes needed */ | |
67 | EVP_CIPHER_CTX *rs,*ws; | |
68 | EVP_CIPHER *c; | |
69 | EVP_MD *md; | |
70 | int num; | |
71 | ||
72 | if (!ssl_cipher_get_evp(s->session->cipher,&c,&md)) | |
73 | { | |
74 | ssl2_return_error(s,SSL2_PE_NO_CIPHER); | |
75 | SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); | |
76 | return(0); | |
77 | } | |
78 | ||
79 | s->read_hash=md; | |
80 | s->write_hash=md; | |
81 | ||
82 | if ((s->enc_read_ctx == NULL) && | |
83 | ((s->enc_read_ctx=(EVP_CIPHER_CTX *) | |
84 | Malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) | |
85 | goto err; | |
86 | if ((s->enc_write_ctx == NULL) && | |
87 | ((s->enc_write_ctx=(EVP_CIPHER_CTX *) | |
88 | Malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) | |
89 | goto err; | |
90 | ||
91 | rs= s->enc_read_ctx; | |
92 | ws= s->enc_write_ctx; | |
93 | ||
58964a49 RE |
94 | EVP_CIPHER_CTX_init(rs); |
95 | EVP_CIPHER_CTX_init(ws); | |
96 | ||
d02b48c6 RE |
97 | num=c->key_len; |
98 | s->s2->key_material_length=num*2; | |
99 | ||
100 | ssl2_generate_key_material(s); | |
101 | ||
102 | EVP_EncryptInit(ws,c,&(s->s2->key_material[(client)?num:0]), | |
103 | s->session->key_arg); | |
104 | EVP_DecryptInit(rs,c,&(s->s2->key_material[(client)?0:num]), | |
105 | s->session->key_arg); | |
106 | s->s2->read_key= &(s->s2->key_material[(client)?0:num]); | |
107 | s->s2->write_key= &(s->s2->key_material[(client)?num:0]); | |
108 | return(1); | |
109 | err: | |
110 | SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); | |
111 | return(0); | |
112 | } | |
113 | ||
114 | /* read/writes from s->s2->mac_data using length for encrypt and | |
115 | * decrypt. It sets the s->s2->padding, s->[rw]length and | |
116 | * s->s2->pad_data ptr if we are encrypting */ | |
117 | void ssl2_enc(s,send) | |
118 | SSL *s; | |
119 | int send; | |
120 | { | |
121 | EVP_CIPHER_CTX *ds; | |
122 | unsigned long l; | |
123 | int bs; | |
124 | ||
125 | if (send) | |
126 | { | |
127 | ds=s->enc_write_ctx; | |
128 | l=s->s2->wlength; | |
129 | } | |
130 | else | |
131 | { | |
132 | ds=s->enc_read_ctx; | |
133 | l=s->s2->rlength; | |
134 | } | |
135 | ||
136 | /* check for NULL cipher */ | |
137 | if (ds == NULL) return; | |
138 | ||
139 | ||
140 | bs=ds->cipher->block_size; | |
141 | /* This should be using (bs-1) and bs instead of 7 and 8, but | |
142 | * what the hell. */ | |
143 | if (bs == 8) | |
144 | l=(l+7)/8*8; | |
145 | ||
146 | EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); | |
147 | } | |
148 | ||
149 | void ssl2_mac(s, md,send) | |
150 | SSL *s; | |
151 | unsigned char *md; | |
152 | 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_DigestInit(&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(&c,md,NULL); | |
185 | /* some would say I should zero the md context */ | |
186 | } | |
187 |