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
|
/*
* Interface for AEAD modes
* (C) 2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_AEAD_MODE_H__
#define BOTAN_AEAD_MODE_H__
#include <botan/cipher_mode.h>
namespace Botan {
/**
* Interface for AEAD (Authenticated Encryption with Associated Data)
* modes. These modes provide both encryption and message
* authentication, and can authenticate additional per-message data
* which is not included in the ciphertext (for instance a sequence
* number).
*/
class BOTAN_PUBLIC_API(2,0) AEAD_Mode : public Cipher_Mode
{
public:
bool authenticated() const override { return true; }
/**
* Set associated data that is not included in the ciphertext but
* that should be authenticated. Must be called after set_key and
* before start.
*
* Unless reset by another call, the associated data is kept
* between messages. Thus, if the AD does not change, calling
* once (after set_key) is the optimum.
*
* @param ad the associated data
* @param ad_len length of add in bytes
*/
virtual void set_associated_data(const uint8_t ad[], size_t ad_len) = 0;
/**
* Set associated data that is not included in the ciphertext but
* that should be authenticated. Must be called after set_key and
* before start.
*
* See @ref set_associated_data().
*
* @param ad the associated data
*/
template<typename Alloc>
void set_associated_data_vec(const std::vector<uint8_t, Alloc>& ad)
{
set_associated_data(ad.data(), ad.size());
}
/**
* Set associated data that is not included in the ciphertext but
* that should be authenticated. Must be called after set_key and
* before start.
*
* See @ref set_associated_data().
*
* @param ad the associated data
*/
template<typename Alloc>
void set_ad(const std::vector<uint8_t, Alloc>& ad)
{
set_associated_data(ad.data(), ad.size());
}
/**
* @return default AEAD nonce size (a commonly supported value among AEAD
* modes, and large enough that random collisions are unlikely)
*/
size_t default_nonce_length() const override { return 12; }
virtual ~AEAD_Mode() = default;
};
/**
* Get an AEAD mode by name (eg "AES-128/GCM" or "Serpent/EAX")
* @param name AEAD name
* @param direction ENCRYPTION or DECRYPTION
*/
BOTAN_PUBLIC_API(2,0) AEAD_Mode* get_aead(const std::string& name, Cipher_Dir direction);
}
#endif
|
