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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* Cipher Modes via CommonCrypto
* (C) 2018 Jose Pereira
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/commoncrypto.h>
#include <botan/internal/commoncrypto_utils.h>
#include <botan/cipher_mode.h>
#include <botan/internal/parsing.h>
#include <botan/internal/rounding.h>
#include <botan/scan_name.h>
namespace Botan {
std::string CommonCrypto_Error::ccryptorstatus_to_string(CCCryptorStatus status)
{
switch(status)
{
case kCCSuccess:
return "Success";
case kCCParamError:
return "ParamError";
case kCCBufferTooSmall:
return "BufferTooSmall";
case kCCMemoryFailure:
return "MemoryFailure";
case kCCAlignmentError:
return "AlignmentError";
case kCCDecodeError:
return "DecodeError";
case kCCUnimplemented:
return "Unimplemented";
case kCCOverflow:
return "Overflow";
case kCCRNGFailure:
return "RNGFailure";
case kCCUnspecifiedError:
return "UnspecifiedError";
case kCCCallSequenceError:
return "CallSequenceError";
case kCCKeySizeError:
return "KeySizeError";
default:
return "Unknown";
}
};
CommonCryptor_Opts commoncrypto_opts_from_algo_name(const std::string& algo_name)
{
CommonCryptor_Opts opts;
if(algo_name.compare(0, 3, "AES") == 0)
{
opts.algo = kCCAlgorithmAES;
opts.block_size = kCCBlockSizeAES128;
if(algo_name == "AES-128")
{
opts.key_spec = Key_Length_Specification(kCCKeySizeAES128);
}
else if(algo_name == "AES-192")
{
opts.key_spec = Key_Length_Specification(kCCKeySizeAES192);
}
else if(algo_name == "AES-256")
{
opts.key_spec = Key_Length_Specification(kCCKeySizeAES256);
}
else
{
throw CommonCrypto_Error("Unknown AES algorithm");
}
}
else if(algo_name == "DES")
{
opts.algo = kCCAlgorithmDES;
opts.block_size = kCCBlockSizeDES;
opts.key_spec = Key_Length_Specification(kCCKeySizeDES);
}
else if(algo_name == "TripleDES")
{
opts.algo = kCCAlgorithm3DES;
opts.block_size = kCCBlockSize3DES;
opts.key_spec = Key_Length_Specification(16, kCCKeySize3DES, 8);
}
else if(algo_name == "Blowfish")
{
opts.algo = kCCAlgorithmBlowfish;
opts.block_size = kCCBlockSizeBlowfish;
opts.key_spec = Key_Length_Specification(1, kCCKeySizeMaxBlowfish, 1);
}
else if(algo_name == "CAST-128")
{
opts.algo = kCCAlgorithmCAST;
opts.block_size = kCCBlockSizeCAST;
// Botan's base implementation of CAST does not support shorter keys
// so we limit its minimum key size to 11 here.
opts.key_spec = Key_Length_Specification(11, kCCKeySizeMaxCAST, 1);
}
else
{
throw CommonCrypto_Error("Unsupported cipher");
}
return opts;
}
CommonCryptor_Opts commoncrypto_opts_from_algo(const std::string& algo)
{
SCAN_Name spec(algo);
std::string algo_name = spec.algo_name();
std::string cipher_mode = spec.cipher_mode();
std::string cipher_mode_padding = spec.cipher_mode_pad();
CommonCryptor_Opts opts = commoncrypto_opts_from_algo_name(algo_name);
//TODO add CFB and XTS support
if(cipher_mode.empty() || cipher_mode == "ECB")
{
opts.mode = kCCModeECB;
}
else if(cipher_mode == "CBC")
{
opts.mode = kCCModeCBC;
}
else if(cipher_mode == "CTR")
{
opts.mode = kCCModeCTR;
}
else if(cipher_mode == "OFB")
{
opts.mode = kCCModeOFB;
}
else
{
throw CommonCrypto_Error("Unsupported cipher mode!");
}
if(cipher_mode_padding == "NoPadding")
{
opts.padding = ccNoPadding;
}
/*
else if(cipher_mode_padding.empty() || cipher_mode_padding == "PKCS7")
{
opts.padding = ccPKCS7Padding;
}
*/
else
{
throw CommonCrypto_Error("Unsupported cipher mode padding!");
}
return opts;
}
void commoncrypto_adjust_key_size(const uint8_t key[], size_t length,
const CommonCryptor_Opts& opts, secure_vector<uint8_t>& full_key)
{
if(opts.algo == kCCAlgorithmBlowfish && length < 8)
{
size_t repeat;
switch(length)
{
case 1:
repeat = 8;
break;
case 2:
repeat = 4;
break;
case 3:
repeat = 3;
break;
default:
repeat = 2;
break;
}
full_key.resize(length * repeat);
for(size_t i = 0; i < repeat; i++)
{
copy_mem(full_key.data() + i * length, key, length);
}
}
else if(opts.algo == kCCAlgorithm3DES && length == 16)
{
full_key += std::make_pair(key, 8);
}
}
}
|
