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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. | |
ae5c8664 | 8 | * |
d02b48c6 RE |
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). | |
ae5c8664 | 15 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 22 | * |
d02b48c6 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 52 | * |
d02b48c6 RE |
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 |
ae5c8664 | 61 | # include <stdio.h> |
d02b48c6 | 62 | |
6b691a5c | 63 | int ssl2_enc_init(SSL *s, int client) |
ae5c8664 MC |
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 | ssl2_return_error(s, SSL2_PE_NO_CIPHER); | |
73 | SSLerr(SSL_F_SSL2_ENC_INIT, SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); | |
74 | return (0); | |
75 | } | |
76 | ssl_replace_hash(&s->read_hash, md); | |
77 | ssl_replace_hash(&s->write_hash, md); | |
78 | ||
79 | if ((s->enc_read_ctx == NULL) && ((s->enc_read_ctx = (EVP_CIPHER_CTX *) | |
80 | 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 | rs = s->enc_read_ctx; | |
89 | EVP_CIPHER_CTX_init(rs); | |
90 | ||
91 | if ((s->enc_write_ctx == NULL) && ((s->enc_write_ctx = (EVP_CIPHER_CTX *) | |
92 | OPENSSL_malloc(sizeof | |
93 | (EVP_CIPHER_CTX))) == | |
94 | NULL)) | |
95 | goto err; | |
96 | ||
97 | ws = s->enc_write_ctx; | |
98 | EVP_CIPHER_CTX_init(ws); | |
99 | ||
100 | num = c->key_len; | |
101 | s->s2->key_material_length = num * 2; | |
102 | OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); | |
103 | ||
104 | if (ssl2_generate_key_material(s) <= 0) | |
105 | return 0; | |
106 | ||
107 | OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg)); | |
108 | EVP_EncryptInit_ex(ws, c, NULL, | |
109 | &(s->s2->key_material[(client) ? num : 0]), | |
110 | s->session->key_arg); | |
111 | EVP_DecryptInit_ex(rs, c, NULL, | |
112 | &(s->s2->key_material[(client) ? 0 : num]), | |
113 | s->session->key_arg); | |
114 | s->s2->read_key = &(s->s2->key_material[(client) ? 0 : num]); | |
115 | s->s2->write_key = &(s->s2->key_material[(client) ? num : 0]); | |
116 | return (1); | |
117 | err: | |
118 | SSLerr(SSL_F_SSL2_ENC_INIT, ERR_R_MALLOC_FAILURE); | |
119 | 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 | */ | |
ac3dc3ee | 127 | int ssl2_enc(SSL *s, int send) |
ae5c8664 MC |
128 | { |
129 | EVP_CIPHER_CTX *ds; | |
130 | unsigned long l; | |
131 | int bs; | |
132 | ||
133 | if (send) { | |
134 | ds = s->enc_write_ctx; | |
135 | l = s->s2->wlength; | |
136 | } else { | |
137 | ds = s->enc_read_ctx; | |
138 | l = s->s2->rlength; | |
139 | } | |
140 | ||
141 | /* check for NULL cipher */ | |
142 | if (ds == NULL) | |
143 | return 1; | |
144 | ||
145 | 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 | if (bs == 8) | |
151 | l = (l + 7) / 8 * 8; | |
152 | ||
153 | if (EVP_Cipher(ds, s->s2->mac_data, s->s2->mac_data, l) < 1) | |
154 | return 0; | |
155 | ||
156 | return 1; | |
157 | } | |
d02b48c6 | 158 | |
6b691a5c | 159 | void ssl2_mac(SSL *s, unsigned char *md, int send) |
ae5c8664 MC |
160 | { |
161 | EVP_MD_CTX c; | |
162 | unsigned char sequence[4], *p, *sec, *act; | |
163 | unsigned long seq; | |
164 | unsigned int len; | |
165 | ||
166 | if (send) { | |
167 | seq = s->s2->write_sequence; | |
168 | sec = s->s2->write_key; | |
169 | len = s->s2->wact_data_length; | |
170 | act = s->s2->wact_data; | |
171 | } else { | |
172 | seq = s->s2->read_sequence; | |
173 | sec = s->s2->read_key; | |
174 | len = s->s2->ract_data_length; | |
175 | act = s->s2->ract_data; | |
176 | } | |
177 | ||
178 | p = &(sequence[0]); | |
179 | l2n(seq, p); | |
180 | ||
181 | /* There has to be a MAC algorithm. */ | |
182 | EVP_MD_CTX_init(&c); | |
183 | EVP_MD_CTX_copy(&c, s->read_hash); | |
184 | EVP_DigestUpdate(&c, sec, EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); | |
185 | EVP_DigestUpdate(&c, act, len); | |
186 | /* the above line also does the pad data */ | |
187 | EVP_DigestUpdate(&c, sequence, 4); | |
188 | EVP_DigestFinal_ex(&c, md, NULL); | |
189 | EVP_MD_CTX_cleanup(&c); | |
190 | } | |
191 | #else /* !OPENSSL_NO_SSL2 */ | |
aa82db4f UM |
192 | |
193 | # if PEDANTIC | |
ae5c8664 | 194 | static void *dummy = &dummy; |
aa82db4f | 195 | # endif |
d02b48c6 | 196 | |
aa82db4f | 197 | #endif |