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
|
/*
* OctetString
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/symkey.h>
#include <botan/internal/xor_buf.h>
#include <botan/rng.h>
#include <botan/pipe.h>
#include <botan/hex.h>
#include <algorithm>
namespace Botan {
/*
* Create an OctetString from RNG output
*/
OctetString::OctetString(RandomNumberGenerator& rng,
size_t length)
{
bits = rng.random_vec(length);
}
/*
* Create an OctetString from a hex string
*/
OctetString::OctetString(const std::string& hex_string)
{
bits.resize(1 + hex_string.length() / 2);
bits.resize(hex_decode(&bits[0], hex_string));
}
/*
* Create an OctetString from a byte string
*/
OctetString::OctetString(const byte in[], size_t n)
{
bits.assign(in, in + n);
}
OctetString::OctetString(const MemoryRegion<byte>& b) : bits(b)
{
}
/*
* Set the parity of each key byte to odd
*/
void OctetString::set_odd_parity()
{
const byte ODD_PARITY[256] = {
0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0B, 0x0B,
0x0D, 0x0D, 0x0E, 0x0E, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16,
0x19, 0x19, 0x1A, 0x1A, 0x1C, 0x1C, 0x1F, 0x1F, 0x20, 0x20, 0x23, 0x23,
0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2A, 0x2A, 0x2C, 0x2C, 0x2F, 0x2F,
0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3B, 0x3B,
0x3D, 0x3D, 0x3E, 0x3E, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46,
0x49, 0x49, 0x4A, 0x4A, 0x4C, 0x4C, 0x4F, 0x4F, 0x51, 0x51, 0x52, 0x52,
0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5B, 0x5B, 0x5D, 0x5D, 0x5E, 0x5E,
0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6B, 0x6B,
0x6D, 0x6D, 0x6E, 0x6E, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76,
0x79, 0x79, 0x7A, 0x7A, 0x7C, 0x7C, 0x7F, 0x7F, 0x80, 0x80, 0x83, 0x83,
0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8A, 0x8A, 0x8C, 0x8C, 0x8F, 0x8F,
0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9B, 0x9B,
0x9D, 0x9D, 0x9E, 0x9E, 0xA1, 0xA1, 0xA2, 0xA2, 0xA4, 0xA4, 0xA7, 0xA7,
0xA8, 0xA8, 0xAB, 0xAB, 0xAD, 0xAD, 0xAE, 0xAE, 0xB0, 0xB0, 0xB3, 0xB3,
0xB5, 0xB5, 0xB6, 0xB6, 0xB9, 0xB9, 0xBA, 0xBA, 0xBC, 0xBC, 0xBF, 0xBF,
0xC1, 0xC1, 0xC2, 0xC2, 0xC4, 0xC4, 0xC7, 0xC7, 0xC8, 0xC8, 0xCB, 0xCB,
0xCD, 0xCD, 0xCE, 0xCE, 0xD0, 0xD0, 0xD3, 0xD3, 0xD5, 0xD5, 0xD6, 0xD6,
0xD9, 0xD9, 0xDA, 0xDA, 0xDC, 0xDC, 0xDF, 0xDF, 0xE0, 0xE0, 0xE3, 0xE3,
0xE5, 0xE5, 0xE6, 0xE6, 0xE9, 0xE9, 0xEA, 0xEA, 0xEC, 0xEC, 0xEF, 0xEF,
0xF1, 0xF1, 0xF2, 0xF2, 0xF4, 0xF4, 0xF7, 0xF7, 0xF8, 0xF8, 0xFB, 0xFB,
0xFD, 0xFD, 0xFE, 0xFE };
for(size_t j = 0; j != bits.size(); ++j)
bits[j] = ODD_PARITY[bits[j]];
}
/*
* Hex encode an OctetString
*/
std::string OctetString::as_string() const
{
return hex_encode(&bits[0], bits.size());
}
/*
* XOR Operation for OctetStrings
*/
OctetString& OctetString::operator^=(const OctetString& k)
{
if(&k == this) { zeroise(bits); return (*this); }
xor_buf(&bits[0], k.begin(), std::min(length(), k.length()));
return (*this);
}
/*
* Equality Operation for OctetStrings
*/
bool operator==(const OctetString& s1, const OctetString& s2)
{
return (s1.bits_of() == s2.bits_of());
}
/*
* Unequality Operation for OctetStrings
*/
bool operator!=(const OctetString& s1, const OctetString& s2)
{
return !(s1 == s2);
}
/*
* Append Operation for OctetStrings
*/
OctetString operator+(const OctetString& k1, const OctetString& k2)
{
SecureVector<byte> out;
out += k1.bits_of();
out += k2.bits_of();
return OctetString(out);
}
/*
* XOR Operation for OctetStrings
*/
OctetString operator^(const OctetString& k1, const OctetString& k2)
{
SecureVector<byte> ret(std::max(k1.length(), k2.length()));
copy_mem(&ret[0], k1.begin(), k1.length());
xor_buf(ret, k2.begin(), k2.length());
return OctetString(ret);
}
}
|
