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1/* $OpenBSD: d1_enc.c,v 1.10 2015/07/17 07:04:40 doug Exp $ */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@openssl.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116#include <stdio.h>
117
118#include "ssl_locl.h"
119
120#include <openssl/evp.h>
121#include <openssl/hmac.h>
122#include <openssl/md5.h>
123
124/* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
125 *
126 * Returns:
127 * 0: (in non-constant time) if the record is publically invalid (i.e. too
128 * short etc).
129 * 1: if the record's padding is valid / the encryption was successful.
130 * -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
131 * an internal error occured. */
132int
133dtls1_enc(SSL *s, int send)
134{
135 SSL3_RECORD *rec;
136 EVP_CIPHER_CTX *ds;
137 unsigned long l;
138 int bs, i, j, k, mac_size = 0;
139 const EVP_CIPHER *enc;
140
141 if (send) {
142 if (EVP_MD_CTX_md(s->write_hash)) {
143 mac_size = EVP_MD_CTX_size(s->write_hash);
144 if (mac_size < 0)
145 return -1;
146 }
147 ds = s->enc_write_ctx;
148 rec = &(s->s3->wrec);
149 if (s->enc_write_ctx == NULL)
150 enc = NULL;
151 else {
152 enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
153 if (rec->data != rec->input)
154 /* we can't write into the input stream */
155 fprintf(stderr, "%s:%d: rec->data != rec->input\n",
156 __FILE__, __LINE__);
157 else if (EVP_CIPHER_block_size(ds->cipher) > 1) {
158 arc4random_buf(rec->input,
159 EVP_CIPHER_block_size(ds->cipher));
160 }
161 }
162 } else {
163 if (EVP_MD_CTX_md(s->read_hash)) {
164 mac_size = EVP_MD_CTX_size(s->read_hash);
165 OPENSSL_assert(mac_size >= 0);
166 }
167 ds = s->enc_read_ctx;
168 rec = &(s->s3->rrec);
169 if (s->enc_read_ctx == NULL)
170 enc = NULL;
171 else
172 enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
173 }
174
175
176 if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {
177 memmove(rec->data, rec->input, rec->length);
178 rec->input = rec->data;
179 } else {
180 l = rec->length;
181 bs = EVP_CIPHER_block_size(ds->cipher);
182
183 if ((bs != 1) && send) {
184 i = bs - ((int)l % bs);
185
186 /* Add weird padding of upto 256 bytes */
187
188 /* we need to add 'i' padding bytes of value j */
189 j = i - 1;
190 for (k = (int)l; k < (int)(l + i); k++)
191 rec->input[k] = j;
192 l += i;
193 rec->length += i;
194 }
195
196
197 if (!send) {
198 if (l == 0 || l % bs != 0)
199 return 0;
200 }
201
202 EVP_Cipher(ds, rec->data, rec->input, l);
203
204
205 if ((bs != 1) && !send)
206 return tls1_cbc_remove_padding(s, rec, bs, mac_size);
207 }
208 return (1);
209}
210
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