3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
117 #include "ssl_locl.h"
118 #ifndef OPENSSL_NO_COMP
119 #include <openssl/comp.h>
121 #include <openssl/evp.h>
122 #include <openssl/hmac.h>
123 #include <openssl/md5.h>
124 #include <openssl/rand.h>
126 #include <openssl/des.h>
129 /* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
132 * 0: (in non-constant time) if the record is publically invalid (i.e. too
134 * 1: if the record's padding is valid / the encryption was successful.
135 * -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
136 * an internal error occurred. */
137 int dtls1_enc(SSL
*s
, int send
)
142 int bs
,i
,j
,k
,mac_size
=0;
143 const EVP_CIPHER
*enc
;
147 if (EVP_MD_CTX_md(s
->write_hash
))
149 mac_size
=EVP_MD_CTX_size(s
->write_hash
);
155 if (s
->enc_write_ctx
== NULL
)
159 enc
=EVP_CIPHER_CTX_cipher(s
->enc_write_ctx
);
160 if ( rec
->data
!= rec
->input
)
161 /* we can't write into the input stream */
162 fprintf(stderr
, "%s:%d: rec->data != rec->input\n",
164 else if ( EVP_CIPHER_block_size(ds
->cipher
) > 1)
166 if (RAND_bytes(rec
->input
, EVP_CIPHER_block_size(ds
->cipher
)) <= 0)
173 if (EVP_MD_CTX_md(s
->read_hash
))
175 mac_size
=EVP_MD_CTX_size(s
->read_hash
);
176 OPENSSL_assert(mac_size
>= 0);
180 if (s
->enc_read_ctx
== NULL
)
183 enc
=EVP_CIPHER_CTX_cipher(s
->enc_read_ctx
);
187 printf("dtls1_enc(%d)\n", send
);
188 #endif /* KSSL_DEBUG */
190 if ((s
->session
== NULL
) || (ds
== NULL
) ||
193 memmove(rec
->data
,rec
->input
,rec
->length
);
194 rec
->input
=rec
->data
;
199 bs
=EVP_CIPHER_block_size(ds
->cipher
);
201 if ((bs
!= 1) && send
)
205 /* Add weird padding of upto 256 bytes */
207 /* we need to add 'i' padding bytes of value j */
209 if (s
->options
& SSL_OP_TLS_BLOCK_PADDING_BUG
)
211 if (s
->s3
->flags
& TLS1_FLAGS_TLS_PADDING_BUG
)
214 for (k
=(int)l
; k
<(int)(l
+i
); k
++)
223 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
224 ds
,rec
->data
,rec
->input
,l
);
225 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
226 ds
->buf_len
, ds
->cipher
->key_len
,
227 DES_KEY_SZ
, DES_SCHEDULE_SZ
,
230 for (i
=0; i
<ds
->cipher
->iv_len
; i
++) printf("%02X", ds
->iv
[i
]);
232 printf("\trec->input=");
233 for (ui
=0; ui
<l
; ui
++) printf(" %02x", rec
->input
[ui
]);
236 #endif /* KSSL_DEBUG */
240 if (l
== 0 || l
%bs
!= 0)
244 EVP_Cipher(ds
,rec
->data
,rec
->input
,l
);
249 printf("\trec->data=");
251 printf(" %02x", rec
->data
[i
]); printf("\n");
253 #endif /* KSSL_DEBUG */
255 if ((bs
!= 1) && !send
)
256 return tls1_cbc_remove_padding(s
, rec
, bs
, mac_size
);