1 /*
2  * aes.h
3  *
4  * header file for the AES block cipher
5  *
6  * David A. McGrew
7  * Cisco Systems, Inc.
8  */
9 
10 /*
11  *
12  * Copyright (c) 2001-2017, Cisco Systems, Inc.
13  * All rights reserved.
14  *
15  * Redistribution and use in source and binary forms, with or without
16  * modification, are permitted provided that the following conditions
17  * are met:
18  *
19  *   Redistributions of source code must retain the above copyright
20  *   notice, this list of conditions and the following disclaimer.
21  *
22  *   Redistributions in binary form must reproduce the above
23  *   copyright notice, this list of conditions and the following
24  *   disclaimer in the documentation and/or other materials provided
25  *   with the distribution.
26  *
27  *   Neither the name of the Cisco Systems, Inc. nor the names of its
28  *   contributors may be used to endorse or promote products derived
29  *   from this software without specific prior written permission.
30  *
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
34  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
35  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
36  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
37  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
38  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
42  * OF THE POSSIBILITY OF SUCH DAMAGE.
43  *
44  */
45 
46 #ifndef AES_H
47 #define AES_H
48 
49 #include "datatypes.h"
50 #include "err.h"
51 
52 #ifdef __cplusplus
53 extern "C" {
54 #endif
55 
56 /* aes internals */
57 
58 typedef struct {
59     v128_t round[15];
60     int num_rounds;
61 } srtp_aes_expanded_key_t;
62 
63 srtp_err_status_t srtp_aes_expand_encryption_key(
64     const uint8_t *key,
65     int key_len,
66     srtp_aes_expanded_key_t *expanded_key);
67 
68 srtp_err_status_t srtp_aes_expand_decryption_key(
69     const uint8_t *key,
70     int key_len,
71     srtp_aes_expanded_key_t *expanded_key);
72 
73 void srtp_aes_encrypt(v128_t *plaintext,
74                       const srtp_aes_expanded_key_t *exp_key);
75 
76 void srtp_aes_decrypt(v128_t *plaintext,
77                       const srtp_aes_expanded_key_t *exp_key);
78 
79 #ifdef __cplusplus
80 }
81 #endif
82 
83 #endif /* AES_H */
84