122 lines
6.7 KiB
C#
122 lines
6.7 KiB
C#
namespace Tiger.Security;
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public class Rc4
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{
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private int _i;
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private byte _j;
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private readonly byte[] _pKey;
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private readonly byte[] _psBox;
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private static readonly byte[] ArtificialKey =
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{
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44, 214, 122, 91, 114, 79, 16, 141, 115, 110, 207, 216, 238, 65, 59, 50, 186, 70, 128, 248, 107, 12, 33,
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247, 66, 79, 53, 216, 74, 81, 145, 249, 179, 111, 233, 56, 49, 92, 123, 162, 26, 46, 182, 96, 208, 93, 114,
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170, 255, 19, 164, 208, 79, 91, 241, 128, 158, 25, 252, 194, 217, 20, 22, 44, 1, 253, 45, 91, 113, 89, 203,
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80, 34, 112, 99, 82, 243, 8, 90, 240, 39, 17, 230, 232, 80, 180, 173, 164, 112, 163, 217, 155, 170, 41, 187,
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156, 213, 199, 176, 180, 180, 236, 167, 128, 31, 155, 210, 208, 55, 198, 5, 243, 27, 208, 78, 13, 142, 64,
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80, 21, 18, 19, 175, 252, 126, 194, 11, 190, 99, 94, 184, 248, 167, 77, 45, 5, 141, 128, 72, 42, 45, 107,
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88, 140, 147, 30, 248, 243, 208, 82, 137, 181, 69, 177, 128, 216, 25, 3, 239, 179, 160, 159, 129, 135, 23,
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62, 192, 90, 91, 172, 119, 255, 135, 39, 78, 216, 12, 188, 45, 204, 93, 54, 30, 165, 129, 178, 151, 253, 92,
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31, 196, 126, 4, 72, 182, 180, 216, 144, 78, 255, 185, 228, 134, 92, 103, 141, 2, 144, 123, 161, 101, 187,
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145, 187, 171, 62, 21, 244, 17, 231, 203, 120, 176, 87, 150, 89, 244, 7, 29, 21, 235, 165, 86, 125, 184, 90,
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232, 232, 145, 15, 198, 165, 103, 12, 245, 177, 151, 29, 45, 26, 184, 91, 20, 16, 231, 174, 237, 207, 165,
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251, 114, 185, 245, 68, 82, 116, 216, 0, 203, 89, 234, 174, 100, 220, 60, 42, 60, 103, 17, 93, 208, 72, 242,
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116, 148, 84, 230, 115, 56, 138, 134, 107, 199, 17, 73, 58, 75, 187, 200, 253, 141, 249, 246, 74, 201, 166,
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194, 156, 72, 221, 20, 6, 91, 191, 243, 100, 3, 113, 79, 59, 175, 94, 112, 81, 69, 166, 145, 89, 163, 111,
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180, 110, 146, 156, 43, 206, 248, 22, 188, 27, 123, 152, 65, 136, 212, 185, 83, 104, 162, 69, 21, 208, 116,
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78, 193, 2, 179, 222, 109, 66, 75, 56, 46, 21, 105, 140, 236, 13, 78, 58, 30, 55, 114, 228, 96, 156, 89,
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179, 116, 30, 63, 7, 52, 10, 182, 25, 87, 29, 166, 75, 64, 89, 30, 110, 40, 50, 121, 107, 44, 151, 246, 147,
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131, 39, 105, 227, 58, 66, 56, 82, 107, 73, 91, 133, 210, 202, 174, 56, 108, 29, 117, 109, 128, 103, 237,
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227, 13, 138, 177, 180, 146, 142, 82, 83, 115, 194, 148, 62, 74, 92, 154, 95, 194, 104, 216, 2, 166, 59,
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150, 137, 164, 49, 189, 33, 236, 46, 82, 169, 73, 77, 177, 81, 67, 98, 181, 116, 49, 76, 97, 204, 227, 29,
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203, 113, 110, 242, 255, 140, 46, 204, 144, 39, 234, 167, 30, 150, 110, 219, 138, 136, 88, 12, 179, 71, 23,
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150, 233, 80, 217, 244, 248, 111, 65, 255, 69, 217, 55, 49, 43, 228, 225, 10, 123, 71, 41, 173, 7, 15, 194,
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8, 87, 209, 75, 212, 179, 144, 151, 48, 134, 47, 109, 212, 8, 24, 66, 102, 198, 211, 35, 184, 154, 76, 147,
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170, 90, 247, 53, 31, 164, 5, 189, 12, 208, 99, 185, 52, 74, 154, 137, 235, 112, 132, 5, 16, 65, 124, 87,
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109, 83, 170, 37, 20, 88, 134, 2, 86, 218, 169, 222, 128, 202, 28, 87, 81, 154, 199, 124, 239, 130, 47, 88,
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219, 61, 97, 18, 95, 81, 144, 123, 64, 49, 239, 24, 87, 134, 24, 102, 230, 169, 145, 83, 11, 126, 166, 230,
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149, 31, 164, 94, 197, 27, 225, 35, 17, 24, 241, 140, 17, 42, 10, 40, 124, 217, 114, 116, 252, 232, 55, 77,
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88, 75, 5, 48, 180, 220, 218, 124, 97, 177, 184, 192, 205, 59, 54, 89, 152, 79, 6, 64, 29, 167, 155, 62, 14,
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197, 181, 66, 142, 153, 91, 230, 43, 96, 110, 122, 187, 235, 209, 190, 241, 128, 50, 23, 53, 114, 43, 111,
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106, 99, 15, 232, 115, 101, 210, 234, 245, 238, 164, 56, 123, 94, 125, 223, 97, 210, 151, 91, 204, 4, 72,
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140, 41, 143, 19, 93, 212, 153, 102, 182, 243, 102, 93, 214, 32, 68, 236, 146, 92, 168, 99, 46, 150, 249,
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34, 177, 203, 105, 126, 129, 43, 156, 166, 3, 168, 43, 81, 183, 131, 168, 111, 131, 157, 155, 195, 195, 177,
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47, 180, 82, 61, 225, 62, 150, 176, 212, 191, 129, 117, 98, 72, 173, 192, 36, 203, 15, 224, 254, 52, 127,
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174, 231, 38, 213, 239, 120, 52, 178, 101, 97, 132, 130, 144, 152, 251, 226, 90, 18, 233, 74, 41, 88, 28,
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17, 58, 177, 84, 226, 119, 241, 25, 192, 7, 157, 125, 170, 188, 191, 186, 75, 97, 225, 115, 184, 100, 168,
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133, 0, 220, 95, 160, 242, 14, 185, 219, 214, 108, 157, 142, 32, 135, 69, 86, 64, 90, 236, 179, 137, 64,
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128, 214, 63, 132, 152, 177, 167, 158, 8, 122, 139, 89, 115, 11, 27, 85, 94, 45, 12, 164, 18, 169, 213, 74,
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196, 61, 55, 60, 238, 33, 77, 181, 88, 166, 61, 96, 152, 139, 209, 42, 223, 203, 149, 25, 93, 71, 132, 40,
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77, 31, 187, 168, 88, 210, 106, 251, 181, 29, 15, 158, 194, 183, 176, 230, 91, 2, 124, 174, 86, 165, 57,
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108, 191, 227, 106, 164, 159, 110, 35, 205, 248, 254, 105, 129, 25, 77, 6, 164, 93, 176, 192, 205, 26, 96,
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109, 191, 35, 239, 46, 124, 53, 208, 221, 175, 169, 246, 68, 228, 158, 39, 221, 66, 234, 170, 154, 6, 192,
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132, 25, 6, 168, 169, 26, 251, 183, 23, 204, 192, 34, 96, 126, 20, 183, 135, 20, 223, 115, 137, 254, 247,
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13, 71, 7, 176, 162, 184, 184, 255, 128, 229, 236, 107, 42, 80, 68, 112, 127, 4, 57, 89, 26, 78, 251, 177,
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21, 151, 224, 26, 227, 112, 78, 240, 11, 247, 87, 103
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};
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public Rc4(int key)
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{
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_i = 0;
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_j = 0;
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_pKey = new byte[256];
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_psBox = new byte[256];
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Initialize(key);
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}
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private void Initialize(int key)
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{
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var len = (key & 248) / 8;
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if (len < 20)
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{
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len += 20;
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}
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var tOffset = key % 1024;
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var cKey = new byte[len];
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var prevKey = 0;
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var m = 2;
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for (_i = 0; _i < len; _i++)
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{
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var keySkip = (prevKey % 19 - _i % 7);
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m *= -1;
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var nkey = ArtificialKey[Math.Abs(tOffset + _i * m * keySkip + keySkip) % ArtificialKey.Length];
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prevKey = nkey;
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cKey[_i] = nkey;
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}
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for (_i = 0; _i <= 255; _i++)
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{
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_pKey[_i] = cKey[(_i % len)];
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_psBox[_i] = (byte)_i;
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}
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for (_i = 0; _i <= 255; _i++)
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{
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_j = (byte)((_j + _psBox[_i] + _pKey[_i]) % 256);
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(_psBox[_i], _psBox[_j]) = (_psBox[_j], _psBox[_i]);
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}
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_i = 0;
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_j = 0;
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}
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public byte[] Decipher(byte[] data)
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{
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var result = new byte[data.Length / 2];
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for (int a = 0, b = 0; a < data.Length; a += 2, b++)
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{
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_i = (byte)((_i + 1) % 256);
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_j = (byte)((_j + _psBox[_i]) % 256);
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(_psBox[_i], _psBox[_j]) = (_psBox[_j], _psBox[_i]);
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var d = _psBox[(_psBox[_i] + _psBox[_j]) % 256];
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var t = Convert.ToByte(System.Text.Encoding.Default.GetString(new[] { data[a], data[a + 1] }), 16);
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result[b] += (byte)(t ^ d);
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}
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return result;
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}
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} |