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1 /* | |
2 * aes_icm.h | |
3 * | |
4 * Header for AES Integer Counter Mode. | |
5 * | |
6 * David A. McGrew | |
7 * Cisco Systems, Inc. | |
8 * | |
9 */ | |
10 /* | |
11 * | |
12 * Copyright (c) 2001-2005,2012, 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_ICM_H | |
47 #define AES_ICM_H | |
48 | |
49 #include "cipher.h" | |
50 #include <openssl/evp.h> | |
51 #include <openssl/aes.h> | |
52 | |
53 #ifdef OPENSSL_IS_BORINGSSL | |
54 // BoringSSL doesn't support AES-192, cipher will be disabled | |
55 #define SRTP_NO_AES192 | |
56 #endif | |
57 | |
58 #define SALT_SIZE 14 | |
59 #define AES_128_KEYSIZE AES_BLOCK_SIZE | |
60 #ifndef SRTP_NO_AES192 | |
61 #define AES_192_KEYSIZE AES_BLOCK_SIZE + AES_BLOCK_SIZE / 2 | |
62 #endif | |
63 #define AES_256_KEYSIZE AES_BLOCK_SIZE * 2 | |
64 #define AES_128_KEYSIZE_WSALT AES_128_KEYSIZE + SALT_SIZE | |
65 #ifndef SRTP_NO_AES192 | |
66 #define AES_192_KEYSIZE_WSALT AES_192_KEYSIZE + SALT_SIZE | |
67 #endif | |
68 #define AES_256_KEYSIZE_WSALT AES_256_KEYSIZE + SALT_SIZE | |
69 | |
70 typedef struct { | |
71 v128_t counter; /* holds the counter value */ | |
72 v128_t offset; /* initial offset value */ | |
73 v256_t key; | |
74 int key_size; | |
75 EVP_CIPHER_CTX ctx; | |
76 } aes_icm_ctx_t; | |
77 | |
78 err_status_t aes_icm_openssl_set_iv(aes_icm_ctx_t *c, void *iv, int dir); | |
79 err_status_t aes_icm_openssl_context_init(aes_icm_ctx_t *c, const uint8_t *key,
int len); | |
80 err_status_t aes_icm_output(aes_icm_ctx_t *c, uint8_t *buffer, int num_octets_to
_output); | |
81 uint16_t aes_icm_bytes_encrypted(aes_icm_ctx_t *c); | |
82 | |
83 | |
84 #endif /* AES_ICM_H */ | |
85 | |
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