summaryrefslogtreecommitdiff
path: root/src/libstrongswan/crypto/aead.h
blob: 3f6abb4f97e2bc5fbe314daf36c4788cb3c79da5 (plain)
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 transform for this aead
 * @return				aead transform
 */
aead_t *aead_create(crypter_t *crypter, signer_t *signer);

#endif /** AEAD_H_ @}*/