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36d16f8e | 1 | /* ssl/d1_enc.c */ |
40720ce3 | 2 | /* |
36d16f8e | 3 | * DTLS implementation written by Nagendra Modadugu |
40720ce3 | 4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
36d16f8e BL |
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 | |
40720ce3 | 14 | * notice, this list of conditions and the following disclaimer. |
36d16f8e BL |
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. | |
40720ce3 | 65 | * |
36d16f8e BL |
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). | |
40720ce3 | 72 | * |
36d16f8e BL |
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. | |
40720ce3 | 79 | * |
36d16f8e BL |
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 :-). | |
40720ce3 | 94 | * 4. If you include any Windows specific code (or a derivative thereof) from |
36d16f8e BL |
95 | * the apps directory (application code) you must include an acknowledgement: |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40720ce3 | 97 | * |
36d16f8e BL |
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. | |
40720ce3 | 109 | * |
36d16f8e BL |
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 | #include "ssl_locl.h" | |
f4677b79 | 118 | #ifndef OPENSSL_NO_COMP |
40720ce3 | 119 | # include <openssl/comp.h> |
f4677b79 | 120 | #endif |
36d16f8e BL |
121 | #include <openssl/evp.h> |
122 | #include <openssl/hmac.h> | |
123 | #include <openssl/md5.h> | |
124 | #include <openssl/rand.h> | |
2c17b493 | 125 | #ifdef KSSL_DEBUG |
40720ce3 | 126 | # include <openssl/des.h> |
2c17b493 | 127 | #endif |
36d16f8e | 128 | |
3e8042c3 MC |
129 | /*- |
130 | * dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. | |
be885297 BL |
131 | * |
132 | * Returns: | |
133 | * 0: (in non-constant time) if the record is publically invalid (i.e. too | |
134 | * short etc). | |
135 | * 1: if the record's padding is valid / the encryption was successful. | |
136 | * -1: if the record's padding/AEAD-authenticator is invalid or, if sending, | |
3e8042c3 MC |
137 | * an internal error occured. |
138 | */ | |
36d16f8e | 139 | int dtls1_enc(SSL *s, int send) |
40720ce3 MC |
140 | { |
141 | SSL3_RECORD *rec; | |
142 | EVP_CIPHER_CTX *ds; | |
143 | unsigned long l; | |
144 | int bs, i, j, k, mac_size = 0; | |
145 | const EVP_CIPHER *enc; | |
36d16f8e | 146 | |
40720ce3 MC |
147 | if (send) { |
148 | if (s->write_hash) { | |
149 | mac_size = EVP_MD_size(s->write_hash); | |
150 | if (mac_size < 0) | |
151 | return -1; | |
152 | } | |
153 | ds = s->enc_write_ctx; | |
154 | rec = &(s->s3->wrec); | |
155 | if (s->enc_write_ctx == NULL) | |
156 | enc = NULL; | |
157 | else { | |
158 | enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
159 | if (rec->data != rec->input) | |
160 | /* we can't write into the input stream */ | |
161 | fprintf(stderr, "%s:%d: rec->data != rec->input\n", | |
162 | __FILE__, __LINE__); | |
163 | else if (EVP_CIPHER_block_size(ds->cipher) > 1) { | |
164 | if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) | |
165 | <= 0) | |
166 | return -1; | |
167 | } | |
168 | } | |
169 | } else { | |
170 | if (s->read_hash) { | |
171 | mac_size = EVP_MD_size(s->read_hash); | |
172 | OPENSSL_assert(mac_size >= 0); | |
173 | } | |
174 | ds = s->enc_read_ctx; | |
175 | rec = &(s->s3->rrec); | |
176 | if (s->enc_read_ctx == NULL) | |
177 | enc = NULL; | |
178 | else | |
179 | enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
180 | } | |
36d16f8e BL |
181 | |
182 | #ifdef KSSL_DEBUG | |
40720ce3 MC |
183 | printf("dtls1_enc(%d)\n", send); |
184 | #endif /* KSSL_DEBUG */ | |
36d16f8e | 185 | |
40720ce3 MC |
186 | if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { |
187 | memmove(rec->data, rec->input, rec->length); | |
188 | rec->input = rec->data; | |
189 | } else { | |
190 | l = rec->length; | |
191 | bs = EVP_CIPHER_block_size(ds->cipher); | |
36d16f8e | 192 | |
40720ce3 MC |
193 | if ((bs != 1) && send) { |
194 | i = bs - ((int)l % bs); | |
36d16f8e | 195 | |
40720ce3 | 196 | /* Add weird padding of upto 256 bytes */ |
36d16f8e | 197 | |
40720ce3 MC |
198 | /* we need to add 'i' padding bytes of value j */ |
199 | j = i - 1; | |
200 | if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) { | |
201 | if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) | |
202 | j++; | |
203 | } | |
204 | for (k = (int)l; k < (int)(l + i); k++) | |
205 | rec->input[k] = j; | |
206 | l += i; | |
207 | rec->length += i; | |
208 | } | |
36d16f8e | 209 | #ifdef KSSL_DEBUG |
40720ce3 MC |
210 | { |
211 | unsigned long ui; | |
212 | printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", | |
213 | (void *)ds, rec->data, rec->input, l); | |
214 | printf | |
215 | ("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%ld %ld], %d iv_len\n", | |
216 | ds->buf_len, ds->cipher->key_len, (unsigned long)DES_KEY_SZ, | |
217 | (unsigned long)DES_SCHEDULE_SZ, ds->cipher->iv_len); | |
218 | printf("\t\tIV: "); | |
219 | for (i = 0; i < ds->cipher->iv_len; i++) | |
220 | printf("%02X", ds->iv[i]); | |
221 | printf("\n"); | |
222 | printf("\trec->input="); | |
223 | for (ui = 0; ui < l; ui++) | |
224 | printf(" %02x", rec->input[ui]); | |
225 | printf("\n"); | |
226 | } | |
227 | #endif /* KSSL_DEBUG */ | |
36d16f8e | 228 | |
40720ce3 MC |
229 | if (!send) { |
230 | if (l == 0 || l % bs != 0) | |
231 | return 0; | |
232 | } | |
36d16f8e | 233 | |
40720ce3 | 234 | EVP_Cipher(ds, rec->data, rec->input, l); |
36d16f8e | 235 | |
40720ce3 MC |
236 | #ifdef KSSL_DEBUG |
237 | { | |
238 | unsigned long ki; | |
239 | printf("\trec->data="); | |
240 | for (ki = 0; ki < l; ki++) | |
241 | printf(" %02x", rec->data[ki]); | |
242 | printf("\n"); | |
243 | } | |
244 | #endif /* KSSL_DEBUG */ | |
36d16f8e | 245 | |
40720ce3 MC |
246 | if ((bs != 1) && !send) |
247 | return tls1_cbc_remove_padding(s, rec, bs, mac_size); | |
248 | } | |
249 | return (1); | |
250 | } |