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Root/botan/symkey.cpp

1/*************************************************
2* OctetString Source File *
3* (C) 1999-2006 The Botan Project *
4*************************************************/
5
6#include <botan/symkey.h>
7#include <botan/bit_ops.h>
8#include <botan/pipe.h>
9#include <botan/hex.h>
10#include <botan/rng.h>
11#include <algorithm>
12
13namespace Botan {
14
15/*************************************************
16* Create an OctetString from RNG output *
17*************************************************/
18void OctetString::change(u32bit length)
19 {
20 bits.create(length);
21 Global_RNG::randomize(bits, length);
22 }
23
24/*************************************************
25* Create an OctetString from a hex string *
26*************************************************/
27void OctetString::change(const std::string& hex_string)
28 {
29 SecureVector<byte> hex;
30 for(u32bit j = 0; j != hex_string.length(); ++j)
31 if(Hex_Decoder::is_valid(hex_string[j]))
32 hex.append(hex_string[j]);
33
34 if(hex.size() % 2 != 0)
35 throw Invalid_Argument("OctetString: hex string must encode full bytes");
36 bits.create(hex.size() / 2);
37 for(u32bit j = 0; j != bits.size(); ++j)
38 bits[j] = Hex_Decoder::decode(hex.begin() + 2*j);
39 }
40
41/*************************************************
42* Create an OctetString from a byte string *
43*************************************************/
44void OctetString::change(const byte in[], u32bit n)
45 {
46 bits.create(n);
47 bits.copy(in, n);
48 }
49
50/*************************************************
51* Set the parity of each key byte to odd *
52*************************************************/
53void OctetString::set_odd_parity()
54 {
55 const byte ODD_PARITY[256] = {
56 0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0B, 0x0B,
57 0x0D, 0x0D, 0x0E, 0x0E, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16,
58 0x19, 0x19, 0x1A, 0x1A, 0x1C, 0x1C, 0x1F, 0x1F, 0x20, 0x20, 0x23, 0x23,
59 0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2A, 0x2A, 0x2C, 0x2C, 0x2F, 0x2F,
60 0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3B, 0x3B,
61 0x3D, 0x3D, 0x3E, 0x3E, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46,
62 0x49, 0x49, 0x4A, 0x4A, 0x4C, 0x4C, 0x4F, 0x4F, 0x51, 0x51, 0x52, 0x52,
63 0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5B, 0x5B, 0x5D, 0x5D, 0x5E, 0x5E,
64 0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6B, 0x6B,
65 0x6D, 0x6D, 0x6E, 0x6E, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76,
66 0x79, 0x79, 0x7A, 0x7A, 0x7C, 0x7C, 0x7F, 0x7F, 0x80, 0x80, 0x83, 0x83,
67 0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8A, 0x8A, 0x8C, 0x8C, 0x8F, 0x8F,
68 0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9B, 0x9B,
69 0x9D, 0x9D, 0x9E, 0x9E, 0xA1, 0xA1, 0xA2, 0xA2, 0xA4, 0xA4, 0xA7, 0xA7,
70 0xA8, 0xA8, 0xAB, 0xAB, 0xAD, 0xAD, 0xAE, 0xAE, 0xB0, 0xB0, 0xB3, 0xB3,
71 0xB5, 0xB5, 0xB6, 0xB6, 0xB9, 0xB9, 0xBA, 0xBA, 0xBC, 0xBC, 0xBF, 0xBF,
72 0xC1, 0xC1, 0xC2, 0xC2, 0xC4, 0xC4, 0xC7, 0xC7, 0xC8, 0xC8, 0xCB, 0xCB,
73 0xCD, 0xCD, 0xCE, 0xCE, 0xD0, 0xD0, 0xD3, 0xD3, 0xD5, 0xD5, 0xD6, 0xD6,
74 0xD9, 0xD9, 0xDA, 0xDA, 0xDC, 0xDC, 0xDF, 0xDF, 0xE0, 0xE0, 0xE3, 0xE3,
75 0xE5, 0xE5, 0xE6, 0xE6, 0xE9, 0xE9, 0xEA, 0xEA, 0xEC, 0xEC, 0xEF, 0xEF,
76 0xF1, 0xF1, 0xF2, 0xF2, 0xF4, 0xF4, 0xF7, 0xF7, 0xF8, 0xF8, 0xFB, 0xFB,
77 0xFD, 0xFD, 0xFE, 0xFE };
78
79 for(u32bit j = 0; j != bits.size(); ++j)
80 bits[j] = ODD_PARITY[bits[j]];
81 }
82
83/*************************************************
84* Hex encode an OctetString *
85*************************************************/
86std::string OctetString::as_string() const
87 {
88 Pipe pipe(new Hex_Encoder);
89 pipe.process_msg(bits);
90 return pipe.read_all_as_string();
91 }
92
93/*************************************************
94* XOR Operation for OctetStrings *
95*************************************************/
96OctetString& OctetString::operator^=(const OctetString& k)
97 {
98 if(&k == this) { bits.clear(); return (*this); }
99 xor_buf(bits.begin(), k.begin(), std::min(length(), k.length()));
100 return (*this);
101 }
102
103/*************************************************
104* Equality Operation for OctetStrings *
105*************************************************/
106bool operator==(const OctetString& s1, const OctetString& s2)
107 {
108 return (s1.bits_of() == s2.bits_of());
109 }
110
111/*************************************************
112* Unequality Operation for OctetStrings *
113*************************************************/
114bool operator!=(const OctetString& s1, const OctetString& s2)
115 {
116 return !(s1 == s2);
117 }
118
119/*************************************************
120* Append Operation for OctetStrings *
121*************************************************/
122OctetString operator+(const OctetString& k1, const OctetString& k2)
123 {
124 return OctetString(SecureVector<byte>(k1.bits_of(), k2.bits_of()));
125 }
126
127/*************************************************
128* XOR Operation for OctetStrings *
129*************************************************/
130OctetString operator^(const OctetString& k1, const OctetString& k2)
131 {
132 SecureVector<byte> ret(std::max(k1.length(), k2.length()));
133 ret.copy(k1.begin(), k1.length());
134 xor_buf(ret, k2.begin(), k2.length());
135 return OctetString(ret);
136 }
137
138}

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