1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup aead aead
* @{ @ingroup crypto
*/
#ifndef AEAD_H_
#define AEAD_H_
typedef struct aead_t aead_t;
#include <library.h>
#include <crypto/crypters/crypter.h>
#include <crypto/signers/signer.h>
/**
* Authenticated encryption / authentication decryption interface.
*/
struct aead_t {
/**
* Encrypt and sign data, sign associated data.
*
* The plain data must be a multiple of get_block_size(), the IV must
* have a length of get_iv_size().
* If encrypted is NULL, the encryption is done inline. The buffer must
* have space for additional get_icv_size() data, the ICV value is
* appended silently to the plain chunk.
*
* @param plain data to encrypt and sign
* @param assoc associated data to sign
* @param iv initialization vector
* @param encrypted allocated encryption result
*/
void (*encrypt)(aead_t *this, chunk_t plain, chunk_t assoc, chunk_t iv,
chunk_t *encrypted);
/**
* Decrypt and verify data, verify associated data.
*
* The IV must have a length of get_iv_size().
* If plain is NULL, the decryption is done inline. The decrypted data
* is returned in the encrypted chunk, the last get_icv_size() bytes
* contain the verified ICV.
*
* @param encrypted data to encrypt and verify
* @param assoc associated data to verify
* @param iv initialization vector
* @param plain allocated result, if successful
* @return TRUE if MAC verification successful
*/
bool (*decrypt)(aead_t *this, chunk_t encrypted, chunk_t assoc, chunk_t iv,
chunk_t *plain);
/**
* Get the block size for encryption.
*
* @return block size in bytes
*/
size_t (*get_block_size)(aead_t *this);
/**
* Get the integrity check value size of the algorithm.
*
* @return ICV size in bytes
*/
size_t (*get_icv_size)(aead_t *this);
/**
* Get the size of the initialization vector.
*
* @return IV size in bytes
*/
size_t (*get_iv_size)(aead_t *this);
/**
* Get the size of the key material (for encryption and authentication).
*
* @return key size in bytes
*/
size_t (*get_key_size)(aead_t *this);
/**
* Set the key for encryption and authentication.
*
* @param key encryption and authentication key
*/
void (*set_key)(aead_t *this, chunk_t key);
/**
* Destroy a aead_t.
*/
void (*destroy)(aead_t *this);
};
/**
* Create a aead instance using traditional transforms.
*
* @param crypter encryption transform for this aead
* @param signer integrity tranform for this aead
* @return aead transform
*/
aead_t *aead_create(crypter_t *crypter, signer_t *signer);
#endif /** AEAD_H_ @}*/
|
