1 /*
2  * aes_gcm.h
3  *
4  * Header for AES Galois Counter Mode.
5  *
6  * John A. Foley
7  * Cisco Systems, Inc.
8  *
9  */
10 /*
11  *
12  * Copyright (c) 2013-2017, 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_GCM_H
47 #define AES_GCM_H
48 
49 #include "cipher.h"
50 #include "srtp.h"
51 #include "datatypes.h"
52 
53 #ifdef OPENSSL
54 
55 #include <openssl/evp.h>
56 #include <openssl/aes.h>
57 
58 typedef struct {
59     int key_size;
60     int tag_len;
61     EVP_CIPHER_CTX *ctx;
62     srtp_cipher_direction_t dir;
63 } srtp_aes_gcm_ctx_t;
64 
65 #endif /* OPENSSL */
66 
67 #ifdef NSS
68 
69 #include <nss.h>
70 #include <pk11pub.h>
71 
72 #define MAX_AD_SIZE 2048
73 
74 typedef struct {
75     int key_size;
76     int tag_size;
77     srtp_cipher_direction_t dir;
78     NSSInitContext *nss;
79     PK11SymKey *key;
80     uint8_t iv[12];
81     uint8_t aad[MAX_AD_SIZE];
82     int aad_size;
83     CK_GCM_PARAMS params;
84     uint8_t tag[16];
85 } srtp_aes_gcm_ctx_t;
86 
87 #endif /* NSS */
88 
89 #endif /* AES_GCM_H */
90