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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include "tests.h"
#include <fstream>
#include <iostream>
#include <sstream>
#include <boost/regex.hpp>
#include <botan/eax.h>
#include <botan/hex.h>
#include <botan/lookup.h>
using namespace Botan;
namespace {
unsigned from_string(const std::string& s)
{
std::istringstream stream(s);
unsigned n;
stream >> n;
return n;
}
std::string seq(unsigned n)
{
std::string s;
for(unsigned i = 0; i != n; ++i)
{
unsigned char b = (i & 0xFF);
const char bin2hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
s += bin2hex[(b >> 4)];
s += bin2hex[(b & 0x0f)];
}
return s;
}
size_t eax_test(const std::string& algo,
const std::string& key_str,
const std::string& nonce_str,
const std::string& header_str,
const std::string& tag_str,
const std::string& plaintext_str,
const std::string& ciphertext)
{
size_t fail = 0;
try
{
EAX_Encryption enc(get_block_cipher(algo));
EAX_Decryption dec(get_block_cipher(algo));
enc.set_key(hex_decode(key_str));
dec.set_key(hex_decode(key_str));
enc.set_associated_data_vec(hex_decode(header_str));
dec.set_associated_data_vec(hex_decode(header_str));
secure_vector<byte> text = hex_decode_locked(plaintext_str);
enc.start_vec(hex_decode(nonce_str));
enc.finish(text);
const std::string produced = hex_encode(text);
if(produced != ciphertext + tag_str)
{
std::cout << "EAX " << algo << " " << produced << " != expected " << ciphertext << tag_str << "\n";
++fail;
}
text.clear();
text = hex_decode_locked(ciphertext);
text += hex_decode_locked(tag_str);
dec.start_vec(hex_decode(nonce_str));
dec.finish(text);
const std::string decrypted = hex_encode(text);
if(decrypted != plaintext_str)
{
std::cout << "EAX " << algo << " " << decrypted << " != expected " << plaintext_str << "\n";
++fail;
}
}
catch(std::exception& e)
{
std::cout << "Exception during EAX test " << e.what() << "\n";
++fail;
}
return fail;
}
std::pair<std::string, int> translate_algo(const std::string& in)
{
if(in == "aes (16 byte key)")
return std::make_pair("AES-128", 16);
if(in == "blowfish (8 byte key)")
return std::make_pair("Blowfish", 8);
if(in == "rc2 (8 byte key)")
return std::make_pair("RC2", 8);
if(in == "rc5 (8 byte key)")
return std::make_pair("RC5", 8);
if(in == "rc6 (16 byte key)")
return std::make_pair("RC6", 16);
if(in == "safer-sk128 (16 byte key)")
return std::make_pair("SAFER-SK(10)", 16);
if(in == "twofish (16 byte key)")
return std::make_pair("Twofish", 16);
if(in == "des (8 byte key)")
return std::make_pair("DES", 8);
if(in == "3des (24 byte key)")
return std::make_pair("TripleDES", 24);
// These 3 are disabled due to differences in base algorithm.
#if 0
// XTEA: LTC uses little endian, Botan (and Crypto++) use big-endian
// I swapped to LE in XTEA and the vectors did match
if(in == "xtea (16 byte key)")
return std::make_pair("XTEA", 16);
// Skipjack: LTC uses big-endian, Botan (and Crypto++) use
// little-endian I am not sure if that was the full difference
// though, was unable to replicate LTC's EAX vectors with Skipjack
if(in == "skipjack (10 byte key)")
return std::make_pair("Skipjack", 10);
// Noekeon: uses direct keying instead of indirect
if(in == "noekeon (16 byte key)")
return std::make_pair("Noekeon", 16);
#endif
return std::make_pair("", 0);
}
std::string rep(const std::string& s_in, unsigned n)
{
std::string s_out;
for(unsigned i = 0; i != n; ++i)
s_out += s_in[i % s_in.size()];
return s_out;
}
size_t eax_tests(std::istream& in)
{
std::string algo;
std::string key;
size_t fails = 0;
size_t tests = 0;
while(in.good())
{
std::string line;
std::getline(in, line);
if(line == "")
continue;
if(line.size() > 5 && line.substr(0, 4) == "EAX-")
{
std::pair<std::string, int> name_and_keylen =
translate_algo(line.substr(4));
algo = name_and_keylen.first;
key = seq(name_and_keylen.second);
}
else if(algo != "")
{
boost::regex vec_regex("^([ 0-9]{3}): (.*), (.*)$");
boost::smatch what;
if(boost::regex_match(line, what, vec_regex, boost::match_extra))
{
unsigned n = from_string(what[1]);
std::string ciphertext = what[2];
std::string tag = what[3];
std::string plaintext = seq(n);
std::string header = seq(n);
std::string nonce = seq(n);
tests += 1;
fails += eax_test(algo, key, nonce, header, tag,
plaintext, ciphertext);
key = rep(tag, key.size()); // repeat as needed
}
}
}
test_report("EAX", tests, fails);
return fails;
}
}
size_t test_eax()
{
// Uses a set of tests created for libtomcrypt
std::ifstream in("checks/eax.vec");
return eax_tests(in);
}
|
