blob: ee6eb5f4a7e5cdf49ab9d05578b6b5eff4f8e7ba (
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
|
/*
* Symmetric Algorithm Base Class
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SYMMETRIC_ALGORITHM_H__
#define BOTAN_SYMMETRIC_ALGORITHM_H__
#include <botan/key_spec.h>
#include <botan/exceptn.h>
#include <botan/symkey.h>
#include <botan/types.h>
namespace Botan {
/**
* This class represents a symmetric algorithm object.
*/
class BOTAN_DLL SymmetricAlgorithm
{
public:
virtual ~SymmetricAlgorithm() {}
virtual void clear() = 0;
/**
* @return object describing limits on key size
*/
virtual Key_Length_Specification key_spec() const = 0;
/**
* @return minimum allowed key length
*/
size_t maximum_keylength() const
{
return key_spec().maximum_keylength();
}
/**
* @return maxmium allowed key length
*/
size_t minimum_keylength() const
{
return key_spec().minimum_keylength();
}
/**
* Check whether a given key length is valid for this algorithm.
* @param length the key length to be checked.
* @return true if the key length is valid.
*/
bool valid_keylength(size_t length) const
{
return key_spec().valid_keylength(length);
}
/**
* Set the symmetric key of this object.
* @param key the SymmetricKey to be set.
*/
void set_key(const SymmetricKey& key)
{
set_key(key.begin(), key.length());
}
template<typename Alloc>
void set_key(const std::vector<byte, Alloc>& key)
{
set_key(key.data(), key.size());
}
/**
* Set the symmetric key of this object.
* @param key the to be set as a byte array.
* @param length in bytes of key param
*/
void set_key(const byte key[], size_t length)
{
if(!valid_keylength(length))
throw Invalid_Key_Length(name(), length);
key_schedule(key, length);
}
virtual std::string name() const = 0;
private:
/**
* Run the key schedule
* @param key the key
* @param length of key
*/
virtual void key_schedule(const byte key[], size_t length) = 0;
};
}
#endif
|
