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
|
/*
* Cipher Modes
* (C) 2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/cipher_mode.h>
#include <botan/stream_mode.h>
#include <botan/internal/mode_utils.h>
#include <sstream>
#if defined(BOTAN_HAS_MODE_ECB)
#include <botan/ecb.h>
#endif
#if defined(BOTAN_HAS_MODE_CBC)
#include <botan/cbc.h>
#endif
#if defined(BOTAN_HAS_MODE_CFB)
#include <botan/cfb.h>
#endif
#if defined(BOTAN_HAS_MODE_XTS)
#include <botan/xts.h>
#endif
namespace Botan {
#if defined(BOTAN_HAS_MODE_ECB)
template<typename T>
Transform* make_ecb_mode(const Transform::Spec& spec)
{
std::unique_ptr<BlockCipher> bc(BlockCipher::create(spec.arg(0)));
std::unique_ptr<BlockCipherModePaddingMethod> pad(get_bc_pad(spec.arg(1, "NoPadding")));
if(bc && pad)
return new T(bc.release(), pad.release());
return nullptr;
}
BOTAN_REGISTER_TRANSFORM(ECB_Encryption, make_ecb_mode<ECB_Encryption>);
BOTAN_REGISTER_TRANSFORM(ECB_Decryption, make_ecb_mode<ECB_Decryption>);
#endif
#if defined(BOTAN_HAS_MODE_CBC)
template<typename CBC_T, typename CTS_T>
Transform* make_cbc_mode(const Transform::Spec& spec)
{
std::unique_ptr<BlockCipher> bc(BlockCipher::create(spec.arg(0)));
if(bc)
{
const std::string padding = spec.arg(1, "PKCS7");
if(padding == "CTS")
return new CTS_T(bc.release());
else
return new CBC_T(bc.release(), get_bc_pad(padding));
}
return nullptr;
}
BOTAN_REGISTER_TRANSFORM(CBC_Encryption, (make_cbc_mode<CBC_Encryption,CTS_Encryption>));
BOTAN_REGISTER_TRANSFORM(CBC_Decryption, (make_cbc_mode<CBC_Decryption,CTS_Decryption>));
#endif
#if defined(BOTAN_HAS_MODE_CFB)
BOTAN_REGISTER_BLOCK_CIPHER_MODE_LEN(CFB_Encryption, CFB_Decryption, 0);
#endif
#if defined(BOTAN_HAS_MODE_XTS)
BOTAN_REGISTER_BLOCK_CIPHER_MODE(XTS_Encryption, XTS_Decryption);
#endif
Cipher_Mode* get_cipher_mode(const std::string& algo_spec, Cipher_Dir direction)
{
const std::string provider = "";
const char* dir_string = (direction == ENCRYPTION) ? "_Encryption" : "_Decryption";
std::unique_ptr<Transform> t;
t.reset(get_transform(algo_spec, provider, dir_string));
if(Cipher_Mode* cipher = dynamic_cast<Cipher_Mode*>(t.get()))
{
t.release();
return cipher;
}
const std::vector<std::string> algo_parts = split_on(algo_spec, '/');
if(algo_parts.size() < 2)
return nullptr;
const std::string cipher_name = algo_parts[0];
const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]);
if(mode_info.empty())
return nullptr;
std::ostringstream alg_args;
alg_args << '(' << cipher_name;
for(size_t i = 1; i < mode_info.size(); ++i)
alg_args << ',' << mode_info[i];
for(size_t i = 2; i < algo_parts.size(); ++i)
alg_args << ',' << algo_parts[i];
alg_args << ')';
const std::string mode_name = mode_info[0] + alg_args.str();
const std::string mode_name_directional = mode_info[0] + dir_string + alg_args.str();
t.reset(get_transform(mode_name_directional, provider));
if(Cipher_Mode* cipher = dynamic_cast<Cipher_Mode*>(t.get()))
{
t.release();
return cipher;
}
t.reset(get_transform(mode_name, provider));
if(Cipher_Mode* cipher = dynamic_cast<Cipher_Mode*>(t.get()))
{
t.release();
return cipher;
}
if(auto sc = StreamCipher::create(mode_name, provider))
return new Stream_Cipher_Mode(sc.release());
return nullptr;
}
}
|
