Botan  2.7.0
Crypto and TLS for C++11
symkey.cpp
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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 */
19  size_t len)
20  {
21  m_data = rng.random_vec(len);
22  }
23 
24 /*
25 * Create an OctetString from a hex string
26 */
27 OctetString::OctetString(const std::string& hex_string)
28  {
29  m_data.resize(1 + hex_string.length() / 2);
30  m_data.resize(hex_decode(m_data.data(), hex_string));
31  }
32 
33 /*
34 * Create an OctetString from a byte string
35 */
36 OctetString::OctetString(const uint8_t in[], size_t n)
37  {
38  m_data.assign(in, in + n);
39  }
40 
41 /*
42 * Set the parity of each key byte to odd
43 */
45  {
46  const uint8_t ODD_PARITY[256] = {
47  0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0B, 0x0B,
48  0x0D, 0x0D, 0x0E, 0x0E, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16,
49  0x19, 0x19, 0x1A, 0x1A, 0x1C, 0x1C, 0x1F, 0x1F, 0x20, 0x20, 0x23, 0x23,
50  0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2A, 0x2A, 0x2C, 0x2C, 0x2F, 0x2F,
51  0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3B, 0x3B,
52  0x3D, 0x3D, 0x3E, 0x3E, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46,
53  0x49, 0x49, 0x4A, 0x4A, 0x4C, 0x4C, 0x4F, 0x4F, 0x51, 0x51, 0x52, 0x52,
54  0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5B, 0x5B, 0x5D, 0x5D, 0x5E, 0x5E,
55  0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6B, 0x6B,
56  0x6D, 0x6D, 0x6E, 0x6E, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76,
57  0x79, 0x79, 0x7A, 0x7A, 0x7C, 0x7C, 0x7F, 0x7F, 0x80, 0x80, 0x83, 0x83,
58  0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8A, 0x8A, 0x8C, 0x8C, 0x8F, 0x8F,
59  0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9B, 0x9B,
60  0x9D, 0x9D, 0x9E, 0x9E, 0xA1, 0xA1, 0xA2, 0xA2, 0xA4, 0xA4, 0xA7, 0xA7,
61  0xA8, 0xA8, 0xAB, 0xAB, 0xAD, 0xAD, 0xAE, 0xAE, 0xB0, 0xB0, 0xB3, 0xB3,
62  0xB5, 0xB5, 0xB6, 0xB6, 0xB9, 0xB9, 0xBA, 0xBA, 0xBC, 0xBC, 0xBF, 0xBF,
63  0xC1, 0xC1, 0xC2, 0xC2, 0xC4, 0xC4, 0xC7, 0xC7, 0xC8, 0xC8, 0xCB, 0xCB,
64  0xCD, 0xCD, 0xCE, 0xCE, 0xD0, 0xD0, 0xD3, 0xD3, 0xD5, 0xD5, 0xD6, 0xD6,
65  0xD9, 0xD9, 0xDA, 0xDA, 0xDC, 0xDC, 0xDF, 0xDF, 0xE0, 0xE0, 0xE3, 0xE3,
66  0xE5, 0xE5, 0xE6, 0xE6, 0xE9, 0xE9, 0xEA, 0xEA, 0xEC, 0xEC, 0xEF, 0xEF,
67  0xF1, 0xF1, 0xF2, 0xF2, 0xF4, 0xF4, 0xF7, 0xF7, 0xF8, 0xF8, 0xFB, 0xFB,
68  0xFD, 0xFD, 0xFE, 0xFE };
69 
70  for(size_t j = 0; j != m_data.size(); ++j)
71  m_data[j] = ODD_PARITY[m_data[j]];
72  }
73 
74 /*
75 * Hex encode an OctetString
76 */
77 std::string OctetString::as_string() const
78  {
79  return hex_encode(m_data.data(), m_data.size());
80  }
81 
82 /*
83 * XOR Operation for OctetStrings
84 */
86  {
87  if(&k == this) { zeroise(m_data); return (*this); }
88  xor_buf(m_data.data(), k.begin(), std::min(length(), k.length()));
89  return (*this);
90  }
91 
92 /*
93 * Equality Operation for OctetStrings
94 */
95 bool operator==(const OctetString& s1, const OctetString& s2)
96  {
97  return (s1.bits_of() == s2.bits_of());
98  }
99 
100 /*
101 * Unequality Operation for OctetStrings
102 */
103 bool operator!=(const OctetString& s1, const OctetString& s2)
104  {
105  return !(s1 == s2);
106  }
107 
108 /*
109 * Append Operation for OctetStrings
110 */
112  {
114  out += k1.bits_of();
115  out += k2.bits_of();
116  return OctetString(out);
117  }
118 
119 /*
120 * XOR Operation for OctetStrings
121 */
123  {
124  secure_vector<uint8_t> out(std::max(k1.length(), k2.length()));
125 
126  copy_mem(out.data(), k1.begin(), k1.length());
127  xor_buf(out.data(), k2.begin(), k2.length());
128  return OctetString(out);
129  }
130 
131 }
OctetString & operator^=(const OctetString &other)
Definition: symkey.cpp:85
void hex_encode(char output[], const uint8_t input[], size_t input_length, bool uppercase)
Definition: hex.cpp:14
bool operator!=(const AlgorithmIdentifier &a1, const AlgorithmIdentifier &a2)
Definition: alg_id.cpp:90
std::string as_string() const
Definition: symkey.cpp:77
secure_vector< uint8_t > random_vec(size_t bytes)
Definition: rng.h:132
void xor_buf(uint8_t out[], const uint8_t in[], size_t length)
Definition: mem_ops.h:174
OctetString(const std::string &str="")
Definition: symkey.cpp:27
void copy_mem(T *out, const T *in, size_t n)
Definition: mem_ops.h:108
Definition: alg_id.cpp:13
size_t hex_decode(uint8_t output[], const char input[], size_t input_length, size_t &input_consumed, bool ignore_ws)
Definition: hex.cpp:49
size_t length() const
Definition: symkey.h:25
const uint8_t * begin() const
Definition: symkey.h:36
OctetString operator^(const OctetString &k1, const OctetString &k2)
Definition: symkey.cpp:122
OID operator+(const OID &oid, uint32_t component)
Definition: asn1_oid.cpp:87
bool operator==(const AlgorithmIdentifier &a1, const AlgorithmIdentifier &a2)
Definition: alg_id.cpp:75
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:88
secure_vector< uint8_t > bits_of() const
Definition: symkey.h:31
void zeroise(std::vector< T, Alloc > &vec)
Definition: secmem.h:183
void set_odd_parity()
Definition: symkey.cpp:44