/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 | | |
10 | | #include <botan/hex.h> |
11 | | #include <botan/mem_ops.h> |
12 | | #include <botan/rng.h> |
13 | | #include <algorithm> |
14 | | |
15 | | namespace Botan { |
16 | | |
17 | | /* |
18 | | * Create an OctetString from RNG output |
19 | | */ |
20 | 0 | OctetString::OctetString(RandomNumberGenerator& rng, size_t len) { |
21 | 0 | rng.random_vec(m_data, len); |
22 | 0 | } |
23 | | |
24 | | /* |
25 | | * Create an OctetString from a hex string |
26 | | */ |
27 | 0 | OctetString::OctetString(std::string_view hex_string) { |
28 | 0 | if(!hex_string.empty()) { |
29 | 0 | m_data.resize(1 + hex_string.length() / 2); |
30 | 0 | m_data.resize(hex_decode(m_data.data(), hex_string)); |
31 | 0 | } |
32 | 0 | } |
33 | | |
34 | | /* |
35 | | * Create an OctetString from a byte string |
36 | | */ |
37 | 32.0k | OctetString::OctetString(const uint8_t in[], size_t n) { |
38 | 32.0k | m_data.assign(in, in + n); |
39 | 32.0k | } |
40 | | |
41 | | namespace { |
42 | | |
43 | 0 | uint8_t odd_parity_of(uint8_t x) { |
44 | 0 | uint8_t f = x | 0x01; |
45 | 0 | f ^= (f >> 4); |
46 | 0 | f ^= (f >> 2); |
47 | 0 | f ^= (f >> 1); |
48 | |
|
49 | 0 | return (x & 0xFE) ^ (f & 0x01); |
50 | 0 | } |
51 | | |
52 | | } // namespace |
53 | | |
54 | | /* |
55 | | * Set the parity of each key byte to odd |
56 | | */ |
57 | 0 | void OctetString::set_odd_parity() { |
58 | 0 | for(size_t j = 0; j != m_data.size(); ++j) { |
59 | 0 | m_data[j] = odd_parity_of(m_data[j]); |
60 | 0 | } |
61 | 0 | } |
62 | | |
63 | | /* |
64 | | * Hex encode an OctetString |
65 | | */ |
66 | 0 | std::string OctetString::to_string() const { |
67 | 0 | return hex_encode(m_data.data(), m_data.size()); |
68 | 0 | } |
69 | | |
70 | | /* |
71 | | * XOR Operation for OctetStrings |
72 | | */ |
73 | 0 | OctetString& OctetString::operator^=(const OctetString& k) { |
74 | 0 | if(&k == this) { |
75 | 0 | zeroise(m_data); |
76 | 0 | return (*this); |
77 | 0 | } |
78 | 0 | xor_buf(m_data.data(), k.begin(), std::min(length(), k.length())); |
79 | 0 | return (*this); |
80 | 0 | } |
81 | | |
82 | | /* |
83 | | * Equality Operation for OctetStrings |
84 | | */ |
85 | 0 | bool operator==(const OctetString& s1, const OctetString& s2) { |
86 | 0 | return (s1.bits_of() == s2.bits_of()); |
87 | 0 | } |
88 | | |
89 | | /* |
90 | | * Unequality Operation for OctetStrings |
91 | | */ |
92 | 0 | bool operator!=(const OctetString& s1, const OctetString& s2) { |
93 | 0 | return !(s1 == s2); |
94 | 0 | } |
95 | | |
96 | | /* |
97 | | * Append Operation for OctetStrings |
98 | | */ |
99 | 0 | OctetString operator+(const OctetString& k1, const OctetString& k2) { |
100 | 0 | secure_vector<uint8_t> out; |
101 | 0 | out += k1.bits_of(); |
102 | 0 | out += k2.bits_of(); |
103 | 0 | return OctetString(out); |
104 | 0 | } |
105 | | |
106 | | /* |
107 | | * XOR Operation for OctetStrings |
108 | | */ |
109 | 0 | OctetString operator^(const OctetString& k1, const OctetString& k2) { |
110 | 0 | secure_vector<uint8_t> out(std::max(k1.length(), k2.length())); |
111 | |
|
112 | 0 | copy_mem(out.data(), k1.begin(), k1.length()); |
113 | 0 | xor_buf(out.data(), k2.begin(), k2.length()); |
114 | 0 | return OctetString(out); |
115 | 0 | } |
116 | | |
117 | | } // namespace Botan |