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
|
/*************************************************
* Default Engine Algorithms Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/def_eng.h>
#include <botan/lookup.h>
#include <botan/parsing.h>
#include <botan/aes.h>
#include <botan/des.h>
#include <botan/arc4.h>
#include <botan/crc32.h>
#include <botan/sha160.h>
#include <botan/sha256.h>
#include <botan/hmac.h>
namespace Botan {
/*************************************************
* Some macros to simplify control flow *
*************************************************/
#define HANDLE_TYPE_NO_ARGS(NAME, TYPE) \
if(algo_name == NAME) \
{ \
if(name.size() == 1) \
return new TYPE; \
throw Invalid_Algorithm_Name(algo_spec); \
}
#define HANDLE_TYPE_ONE_U32BIT(NAME, TYPE, DEFAULT) \
if(algo_name == NAME) \
{ \
if(name.size() == 1) \
return new TYPE(DEFAULT); \
if(name.size() == 2) \
return new TYPE(to_u32bit(name[1])); \
throw Invalid_Algorithm_Name(algo_spec); \
}
#define HANDLE_TYPE_TWO_U32BIT(NAME, TYPE, DEFAULT) \
if(algo_name == NAME) \
{ \
if(name.size() == 1) \
return new TYPE(DEFAULT); \
if(name.size() == 2) \
return new TYPE(to_u32bit(name[1])); \
if(name.size() == 3) \
return new TYPE(to_u32bit(name[1]), to_u32bit(name[2])); \
throw Invalid_Algorithm_Name(algo_spec); \
}
#define HANDLE_TYPE_ONE_STRING(NAME, TYPE) \
if(algo_name == NAME) \
{ \
if(name.size() == 2) \
return new TYPE(name[1]); \
throw Invalid_Algorithm_Name(algo_spec); \
}
/*************************************************
* Look for an algorithm with this name *
*************************************************/
BlockCipher*
Default_Engine::find_block_cipher(const std::string& algo_spec) const
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
if(name.size() == 0)
return 0;
const std::string algo_name = deref_alias(name[0]);
HANDLE_TYPE_NO_ARGS("AES", AES);
HANDLE_TYPE_NO_ARGS("AES-128", AES_128);
HANDLE_TYPE_NO_ARGS("AES-192", AES_192);
HANDLE_TYPE_NO_ARGS("AES-256", AES_256);
HANDLE_TYPE_NO_ARGS("DES", DES);
HANDLE_TYPE_NO_ARGS("DESX", DESX);
HANDLE_TYPE_NO_ARGS("TripleDES", TripleDES);
return 0;
}
/*************************************************
* Look for an algorithm with this name *
*************************************************/
StreamCipher*
Default_Engine::find_stream_cipher(const std::string& algo_spec) const
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
if(name.size() == 0)
return 0;
const std::string algo_name = deref_alias(name[0]);
HANDLE_TYPE_ONE_U32BIT("ARC4", ARC4, 0);
HANDLE_TYPE_ONE_U32BIT("RC4_drop", ARC4, 768);
return 0;
}
/*************************************************
* Look for an algorithm with this name *
*************************************************/
HashFunction*
Default_Engine::find_hash(const std::string& algo_spec) const
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
if(name.size() == 0)
return 0;
const std::string algo_name = deref_alias(name[0]);
HANDLE_TYPE_NO_ARGS("CRC32", CRC32);
HANDLE_TYPE_NO_ARGS("SHA-160", SHA_160);
HANDLE_TYPE_NO_ARGS("SHA-256", SHA_256);
return 0;
}
/*************************************************
* Look for an algorithm with this name *
*************************************************/
MessageAuthenticationCode*
Default_Engine::find_mac(const std::string& algo_spec) const
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
if(name.size() == 0)
return 0;
const std::string algo_name = deref_alias(name[0]);
HANDLE_TYPE_ONE_STRING("HMAC", HMAC);
return 0;
}
}
|
