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
|
/*
* Algorithm Retrieval
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/lookup.h>
#include <botan/libstate.h>
#include <botan/engine.h>
namespace Botan {
/*
* Query if an algorithm exists
*/
bool have_algorithm(const std::string& name)
{
Algorithm_Factory& af = global_state().algorithm_factory();
if(af.prototype_block_cipher(name))
return true;
if(af.prototype_stream_cipher(name))
return true;
if(af.prototype_hash_function(name))
return true;
if(af.prototype_mac(name))
return true;
return false;
}
/*
* Query the block size of a cipher or hash
*/
u32bit block_size_of(const std::string& name)
{
Algorithm_Factory& af = global_state().algorithm_factory();
if(const BlockCipher* cipher = af.prototype_block_cipher(name))
return cipher->block_size();
if(const HashFunction* hash = af.prototype_hash_function(name))
return hash->hash_block_size();
throw Algorithm_Not_Found(name);
}
/*
* Query the output_length() of a hash or MAC
*/
u32bit output_length_of(const std::string& name)
{
Algorithm_Factory& af = global_state().algorithm_factory();
if(const HashFunction* hash = af.prototype_hash_function(name))
return hash->output_length();
if(const MessageAuthenticationCode* mac = af.prototype_mac(name))
return mac->output_length();
throw Algorithm_Not_Found(name);
}
/*
* Get a cipher object
*/
Keyed_Filter* get_cipher(const std::string& algo_spec,
Cipher_Dir direction)
{
Algorithm_Factory& af = global_state().algorithm_factory();
Algorithm_Factory::Engine_Iterator i(af);
while(Engine* engine = i.next())
{
if(Keyed_Filter* algo = engine->get_cipher(algo_spec, direction, af))
return algo;
}
throw Algorithm_Not_Found(algo_spec);
}
/*
* Get a cipher object
*/
Keyed_Filter* get_cipher(const std::string& algo_spec,
const SymmetricKey& key,
const InitializationVector& iv,
Cipher_Dir direction)
{
Keyed_Filter* cipher = get_cipher(algo_spec, direction);
cipher->set_key(key);
if(iv.length())
cipher->set_iv(iv);
return cipher;
}
/*
* Get a cipher object
*/
Keyed_Filter* get_cipher(const std::string& algo_spec,
const SymmetricKey& key,
Cipher_Dir direction)
{
return get_cipher(algo_spec,
key, InitializationVector(), direction);
}
}
|
