-rw-r--r-- | noncore/apps/zsafe/krc2.cpp | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/noncore/apps/zsafe/krc2.cpp b/noncore/apps/zsafe/krc2.cpp new file mode 100644 index 0000000..162a1b4 --- a/dev/null +++ b/noncore/apps/zsafe/krc2.cpp | |||
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1 | /* C implementation of RC2 encryption algorithm, as described in RFC2268 */ | ||
2 | /* By Matthew Palmer <mjp16@uow.edu.au> */ | ||
3 | /* $Id$ */ | ||
4 | |||
5 | #include "krc2.h" | ||
6 | |||
7 | unsigned char _rc2_pitable[] = { 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, | ||
8 | 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d, | ||
9 | 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e, | ||
10 | 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, | ||
11 | 0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13, | ||
12 | 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32, | ||
13 | 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, | ||
14 | 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82, | ||
15 | 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c, | ||
16 | 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, | ||
17 | 0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1, | ||
18 | 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26, | ||
19 | 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, | ||
20 | 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03, | ||
21 | 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7, | ||
22 | 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, | ||
23 | 0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7, | ||
24 | 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a, | ||
25 | 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, | ||
26 | 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec, | ||
27 | 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc, | ||
28 | 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, | ||
29 | 0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a, | ||
30 | 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31, | ||
31 | 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, | ||
32 | 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9, | ||
33 | 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c, | ||
34 | 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, | ||
35 | 0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0, | ||
36 | 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e, | ||
37 | 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, | ||
38 | 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad }; | ||
39 | |||
40 | unsigned char _rc2_expkey[128];/* Expanded Key */ | ||
41 | int _rc2_counter; /* global integer variable used in mixing */ | ||
42 | int _rc2_s[] = {1, 2, 3, 5}; | ||
43 | |||
44 | Krc2::Krc2() | ||
45 | { | ||
46 | } | ||
47 | |||
48 | Krc2::~Krc2() | ||
49 | { | ||
50 | } | ||
51 | |||
52 | void Krc2::rc2_expandkey(char key[], int length, int ekl) | ||
53 | { | ||
54 | int ekl8, keymask, i; | ||
55 | |||
56 | /* Put supplied key into first length - 1 bytes of the key buffer */ | ||
57 | for (i = 0; i < length; i++) { | ||
58 | _rc2_expkey[i] = key[i]; | ||
59 | } | ||
60 | |||
61 | ekl8 = (ekl + 7) / 8; | ||
62 | i = _rc2_pow(2, (8 + ekl - 8 * ekl8)); | ||
63 | keymask = 255 % i; | ||
64 | |||
65 | /* First expansion step */ | ||
66 | for (i = length; i < 128; i++) { | ||
67 | _rc2_expkey[i] = _rc2_pitable[(_rc2_expkey[i - 1] + _rc2_expkey[i - length]) % 256]; | ||
68 | } | ||
69 | |||
70 | /* Expansion intermediate step */ | ||
71 | _rc2_expkey[128 - ekl8] = _rc2_pitable[_rc2_expkey[128 - ekl8] & keymask]; | ||
72 | |||
73 | /* Third Expansion step */ | ||
74 | for (i = 127 - ekl8; i >= 0; i--) { | ||
75 | _rc2_expkey[i] = _rc2_pitable[_rc2_expkey[i + 1] ^ _rc2_expkey[i + ekl8]]; | ||
76 | } | ||
77 | } | ||
78 | |||
79 | void Krc2::rc2_encrypt(unsigned short input[4]) | ||
80 | { | ||
81 | int i; | ||
82 | |||
83 | _rc2_counter = 0; | ||
84 | for (i = 0; i < 5; i++) { | ||
85 | _rc2_mix(input); | ||
86 | } | ||
87 | _rc2_mash(input); | ||
88 | for (i = 0; i < 6; i++) { | ||
89 | _rc2_mix(input); | ||
90 | } | ||
91 | _rc2_mash(input); | ||
92 | for (i = 0; i < 5; i++) { | ||
93 | _rc2_mix(input); | ||
94 | } | ||
95 | } | ||
96 | |||
97 | void Krc2::_rc2_mix(unsigned short input[]) | ||
98 | { | ||
99 | unsigned short K, i; | ||
100 | |||
101 | for (i = 0; i < 4; i++) { | ||
102 | K = _rc2_expkey[_rc2_counter * 2] + 256 * _rc2_expkey[_rc2_counter * 2 + 1]; | ||
103 | input[i] = input[i] + K + (input[(i + 3) % 4] & input[(i + 2) % 4]) + ((~input[(i + 3) % 4]) & input[(i + 1) % 4]); | ||
104 | _rc2_counter++; | ||
105 | input[i] = _rc2_rol(input[i], _rc2_s[i]); | ||
106 | } | ||
107 | } | ||
108 | |||
109 | void Krc2::_rc2_mash(unsigned short input[]) | ||
110 | { | ||
111 | unsigned short K, i, x; | ||
112 | |||
113 | for (i = 0; i < 4; i++) { | ||
114 | x = input[(i + 3) % 4] & 63; | ||
115 | K = _rc2_expkey[2 * x] + 256 * _rc2_expkey[2 * x + 1]; | ||
116 | input[i] = input[i] + K; | ||
117 | } | ||
118 | } | ||
119 | |||
120 | void Krc2::rc2_decrypt(unsigned short input[4]) | ||
121 | { | ||
122 | int i; | ||
123 | |||
124 | _rc2_counter = 63; | ||
125 | for (i = 0; i < 5; i++) { | ||
126 | _rc2_rmix(input); | ||
127 | } | ||
128 | _rc2_rmash(input); | ||
129 | for (i = 0; i < 6; i++) { | ||
130 | _rc2_rmix(input); | ||
131 | } | ||
132 | _rc2_rmash(input); | ||
133 | for (i = 0; i < 5; i++) { | ||
134 | _rc2_rmix(input); | ||
135 | } | ||
136 | } | ||
137 | |||
138 | void Krc2::_rc2_rmix(unsigned short input[]) | ||
139 | { | ||
140 | unsigned short K; | ||
141 | int i; | ||
142 | |||
143 | for (i = 3; i >= 0; i--) { | ||
144 | input[i] = _rc2_ror(input[i], _rc2_s[i]); | ||
145 | K = _rc2_expkey[_rc2_counter * 2] + 256 * _rc2_expkey[_rc2_counter * 2 + 1]; | ||
146 | input[i] = input[i] - K - (input[(i + 3) % 4] & input[(i + 2) % 4]) - ((~input[(i + 3) % 4]) & input[(i + 1) % 4]); | ||
147 | _rc2_counter--; | ||
148 | } | ||
149 | } | ||
150 | |||
151 | void Krc2::_rc2_rmash(unsigned short input[]) | ||
152 | { | ||
153 | unsigned short K, x; | ||
154 | int i; | ||
155 | |||
156 | for (i = 3; i >= 0; i--) { | ||
157 | x = input[(i + 3) % 4] & 63; | ||
158 | K = _rc2_expkey[2 * x] + 256 * _rc2_expkey[2 * x + 1]; | ||
159 | input[i] = input[i] - K; | ||
160 | } | ||
161 | } | ||
162 | |||
163 | int Krc2::_rc2_pow(int base, int exponent) | ||
164 | { | ||
165 | int i, result; | ||
166 | |||
167 | if (exponent == 0) { | ||
168 | return 1; | ||
169 | } | ||
170 | result = 1; | ||
171 | for (i = 0; i < exponent; i++) { | ||
172 | result = result * base; | ||
173 | } | ||
174 | return result; | ||
175 | } | ||
176 | |||
177 | unsigned short Krc2::_rc2_rol(unsigned short input, int places) | ||
178 | { | ||
179 | unsigned short temp, i; | ||
180 | |||
181 | for (i = 0; i < places; i++) { | ||
182 | temp = input & 0x8000; | ||
183 | input = input << 1; | ||
184 | if (temp) { | ||
185 | input++; | ||
186 | } | ||
187 | } | ||
188 | return input; | ||
189 | } | ||
190 | |||
191 | unsigned short Krc2::_rc2_ror(unsigned short input, int places) | ||
192 | { | ||
193 | unsigned short temp, i; | ||
194 | for (i = 0; i < places; i++) { | ||
195 | temp = input & 0x1; | ||
196 | input = input >> 1; | ||
197 | if (temp) { | ||
198 | input = input + 0x8000; | ||
199 | } | ||
200 | } | ||
201 | return input; | ||
202 | } | ||
203 | |||