1 /* Copyright (C) 2009, Martin Johansson <martin@fatbob.nu>
2 Copyright (C) 2005-2009, Thorvald Natvig <thorvald@natvig.com>
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions
10 - Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 - Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15 - Neither the name of the Developers nor the names of its contributors may
16 be used to endorse or promote products derived from this software without
17 specific prior written permission.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <openssl/rand.h>
35 #include <openssl/aes.h>
40 typedef struct CryptState {
41 uint8_t raw_key[AES_BLOCK_SIZE];
42 uint8_t encrypt_iv[AES_BLOCK_SIZE];
43 uint8_t decrypt_iv[AES_BLOCK_SIZE];
44 uint8_t decrypt_history[0x100];
49 unsigned int uiResync;
51 unsigned int uiRemoteGood;
52 unsigned int uiRemoteLate;
53 unsigned int uiRemoteLost;
54 unsigned int uiRemoteResync;
59 etimer_t tLastRequest;
63 void CryptState_init(cryptState_t *cs);
64 bool_t CryptState_isValid(cryptState_t *cs);
65 void CryptState_genKey(cryptState_t *cs);
66 void CryptState_setKey(cryptState_t *cs, const unsigned char *rkey, const unsigned char *eiv, const unsigned char *div);
67 void CryptState_setDecryptIV(cryptState_t *cs, const unsigned char *iv);
69 bool_t CryptState_decrypt(cryptState_t *cs, const unsigned char *source, unsigned char *dst, unsigned int crypted_length);
70 void CryptState_encrypt(cryptState_t *cs, const unsigned char *source, unsigned char *dst, unsigned int plain_length);