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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* Base class for message authentiction codes
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MESSAGE_AUTH_CODE_BASE_H__
#define BOTAN_MESSAGE_AUTH_CODE_BASE_H__
#include <botan/buf_comp.h>
#include <botan/sym_algo.h>
#include <string>
namespace Botan {
/**
* This class represents Message Authentication Code (MAC) objects.
*/
class BOTAN_DLL MessageAuthenticationCode : public Buffered_Computation,
public SymmetricAlgorithm
{
public:
/**
* Create an instance based on a name
* If provider is empty then best available is chosen.
* @param algo_spec algorithm name
* @param provider provider implementation to use
* @return a null pointer if the algo/provider combination cannot be found
*/
static std::unique_ptr<MessageAuthenticationCode>
create(const std::string& algo_spec,
const std::string& provider = "");
/*
* Create an instance based on a name
* If provider is empty then best available is chosen.
* @param algo_spec algorithm name
* @param provider provider implementation to use
* Throws a Lookup_Error if algo/provider combination cannot be found
*/
static std::unique_ptr<MessageAuthenticationCode>
create_or_throw(const std::string& algo_spec,
const std::string& provider = "");
/**
* @return list of available providers for this algorithm, empty if not available
*/
static std::vector<std::string> providers(const std::string& algo_spec);
virtual ~MessageAuthenticationCode() = default;
/**
* Prepare for processing a message under the specified nonce
*
* Most MACs neither require nor support a nonce; for these algorithms
* calling `start_msg` is optional and calling it with anything other than
* an empty string is an error. One MAC which *requires* a per-message
* nonce be specified is GMAC.
*
* @param nonce the message nonce bytes
* @param nonce_len the size of len in bytes
* Default implementation simply rejects all non-empty nonces
* since most hash/MAC algorithms do not support randomization
*/
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)
{
BOTAN_UNUSED(nonce);
if(nonce_len > 0)
throw Invalid_IV_Length(name(), nonce_len);
}
/**
* Begin processing a message with a nonce
*
* @param nonce the per message nonce
*/
template<typename Alloc>
void start(const std::vector<uint8_t, Alloc>& nonce)
{
start_msg(nonce.data(), nonce.size());
}
/**
* Begin processing a message.
* @param nonce the per message nonce
* @param nonce_len length of nonce
*/
void start(const uint8_t nonce[], size_t nonce_len)
{
start_msg(nonce, nonce_len);
}
/**
* Begin processing a message.
*/
void start()
{
return start_msg(nullptr, 0);
}
/**
* Verify a MAC.
* @param in the MAC to verify as a byte array
* @param length the length of param in
* @return true if the MAC is valid, false otherwise
*/
virtual bool verify_mac(const uint8_t in[], size_t length);
/**
* Verify a MAC.
* @param in the MAC to verify as a byte array
* @return true if the MAC is valid, false otherwise
*/
virtual bool verify_mac(const std::vector<uint8_t>& in)
{
return verify_mac(in.data(), in.size());
}
/**
* Verify a MAC.
* @param in the MAC to verify as a byte array
* @return true if the MAC is valid, false otherwise
*/
virtual bool verify_mac(const secure_vector<uint8_t>& in)
{
return verify_mac(in.data(), in.size());
}
/**
* Get a new object representing the same algorithm as *this
*/
virtual MessageAuthenticationCode* clone() const = 0;
/**
* @return provider information about this implementation. Default is "base",
* might also return "sse2", "avx2", "openssl", or some other arbitrary string.
*/
virtual std::string provider() const { return "base"; }
};
typedef MessageAuthenticationCode MAC;
}
#endif
|
