/src/botan/src/lib/base/symkey.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * OctetString |
3 | | * (C) 1999-2007 Jack Lloyd |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #include <botan/symkey.h> |
9 | | #include <botan/rng.h> |
10 | | #include <botan/hex.h> |
11 | | #include <algorithm> |
12 | | |
13 | | namespace Botan { |
14 | | |
15 | | /* |
16 | | * Create an OctetString from RNG output |
17 | | */ |
18 | | OctetString::OctetString(RandomNumberGenerator& rng, |
19 | | size_t len) |
20 | 0 | { |
21 | 0 | rng.random_vec(m_data, len); |
22 | 0 | } |
23 | | |
24 | | /* |
25 | | * Create an OctetString from a hex string |
26 | | */ |
27 | | OctetString::OctetString(const std::string& hex_string) |
28 | 73.0k | { |
29 | 73.0k | if(!hex_string.empty()) |
30 | 49.9k | { |
31 | 49.9k | m_data.resize(1 + hex_string.length() / 2); |
32 | 49.9k | m_data.resize(hex_decode(m_data.data(), hex_string)); |
33 | 49.9k | } |
34 | 73.0k | } |
35 | | |
36 | | /* |
37 | | * Create an OctetString from a byte string |
38 | | */ |
39 | | OctetString::OctetString(const uint8_t in[], size_t n) |
40 | 0 | { |
41 | 0 | m_data.assign(in, in + n); |
42 | 0 | } |
43 | | |
44 | | namespace { |
45 | | |
46 | | uint8_t odd_parity_of(uint8_t x) |
47 | 0 | { |
48 | 0 | uint8_t f = x | 0x01; |
49 | 0 | f ^= (f >> 4); |
50 | 0 | f ^= (f >> 2); |
51 | 0 | f ^= (f >> 1); |
52 | |
|
53 | 0 | return (x & 0xFE) ^ (f & 0x01); |
54 | 0 | } |
55 | | |
56 | | } |
57 | | |
58 | | /* |
59 | | * Set the parity of each key byte to odd |
60 | | */ |
61 | | void OctetString::set_odd_parity() |
62 | 0 | { |
63 | 0 | for(size_t j = 0; j != m_data.size(); ++j) |
64 | 0 | m_data[j] = odd_parity_of(m_data[j]); |
65 | 0 | } |
66 | | |
67 | | /* |
68 | | * Hex encode an OctetString |
69 | | */ |
70 | | std::string OctetString::to_string() const |
71 | 0 | { |
72 | 0 | return hex_encode(m_data.data(), m_data.size()); |
73 | 0 | } |
74 | | |
75 | | /* |
76 | | * XOR Operation for OctetStrings |
77 | | */ |
78 | | OctetString& OctetString::operator^=(const OctetString& k) |
79 | 0 | { |
80 | 0 | if(&k == this) { zeroise(m_data); return (*this); } |
81 | 0 | xor_buf(m_data.data(), k.begin(), std::min(length(), k.length())); |
82 | 0 | return (*this); |
83 | 0 | } |
84 | | |
85 | | /* |
86 | | * Equality Operation for OctetStrings |
87 | | */ |
88 | | bool operator==(const OctetString& s1, const OctetString& s2) |
89 | 0 | { |
90 | 0 | return (s1.bits_of() == s2.bits_of()); |
91 | 0 | } |
92 | | |
93 | | /* |
94 | | * Unequality Operation for OctetStrings |
95 | | */ |
96 | | bool operator!=(const OctetString& s1, const OctetString& s2) |
97 | 0 | { |
98 | 0 | return !(s1 == s2); |
99 | 0 | } |
100 | | |
101 | | /* |
102 | | * Append Operation for OctetStrings |
103 | | */ |
104 | | OctetString operator+(const OctetString& k1, const OctetString& k2) |
105 | 0 | { |
106 | 0 | secure_vector<uint8_t> out; |
107 | 0 | out += k1.bits_of(); |
108 | 0 | out += k2.bits_of(); |
109 | 0 | return OctetString(out); |
110 | 0 | } |
111 | | |
112 | | /* |
113 | | * XOR Operation for OctetStrings |
114 | | */ |
115 | | OctetString operator^(const OctetString& k1, const OctetString& k2) |
116 | 0 | { |
117 | 0 | secure_vector<uint8_t> out(std::max(k1.length(), k2.length())); |
118 | |
|
119 | 0 | copy_mem(out.data(), k1.begin(), k1.length()); |
120 | 0 | xor_buf(out.data(), k2.begin(), k2.length()); |
121 | 0 | return OctetString(out); |
122 | 0 | } |
123 | | |
124 | | } |