551 lines
31 KiB
C#
551 lines
31 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Parameters;
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namespace Org.BouncyCastle.Crypto.Engines
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{
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/**
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* an implementation of the AES (Rijndael), from FIPS-197.
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* <p>
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* For further details see: <a href="http://csrc.nist.gov/encryption/aes/">http://csrc.nist.gov/encryption/aes/</a>.
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*
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* This implementation is based on optimizations from Dr. Brian Gladman's paper and C code at
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* <a href="http://fp.gladman.plus.com/cryptography_technology/rijndael/">http://fp.gladman.plus.com/cryptography_technology/rijndael/</a>
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*
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* There are three levels of tradeoff of speed vs memory
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* Because java has no preprocessor, they are written as three separate classes from which to choose
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*
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* The fastest uses 8Kbytes of static tables to precompute round calculations, 4 256 word tables for encryption
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* and 4 for decryption.
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*
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* The middle performance version uses only one 256 word table for each, for a total of 2Kbytes,
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* adding 12 rotate operations per round to compute the values contained in the other tables from
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* the contents of the first.
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*
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* The slowest version uses no static tables at all and computes the values in each round.
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* </p>
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* <p>
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* This file contains the middle performance version with 2Kbytes of static tables for round precomputation.
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* </p>
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*/
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public class AesEngine
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: IBlockCipher
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{
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// The S box
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private static readonly byte[] S =
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{
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99, 124, 119, 123, 242, 107, 111, 197,
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48, 1, 103, 43, 254, 215, 171, 118,
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202, 130, 201, 125, 250, 89, 71, 240,
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173, 212, 162, 175, 156, 164, 114, 192,
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183, 253, 147, 38, 54, 63, 247, 204,
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52, 165, 229, 241, 113, 216, 49, 21,
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4, 199, 35, 195, 24, 150, 5, 154,
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7, 18, 128, 226, 235, 39, 178, 117,
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9, 131, 44, 26, 27, 110, 90, 160,
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82, 59, 214, 179, 41, 227, 47, 132,
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83, 209, 0, 237, 32, 252, 177, 91,
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106, 203, 190, 57, 74, 76, 88, 207,
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208, 239, 170, 251, 67, 77, 51, 133,
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69, 249, 2, 127, 80, 60, 159, 168,
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81, 163, 64, 143, 146, 157, 56, 245,
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188, 182, 218, 33, 16, 255, 243, 210,
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205, 12, 19, 236, 95, 151, 68, 23,
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196, 167, 126, 61, 100, 93, 25, 115,
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96, 129, 79, 220, 34, 42, 144, 136,
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70, 238, 184, 20, 222, 94, 11, 219,
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224, 50, 58, 10, 73, 6, 36, 92,
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194, 211, 172, 98, 145, 149, 228, 121,
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231, 200, 55, 109, 141, 213, 78, 169,
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108, 86, 244, 234, 101, 122, 174, 8,
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186, 120, 37, 46, 28, 166, 180, 198,
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232, 221, 116, 31, 75, 189, 139, 138,
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112, 62, 181, 102, 72, 3, 246, 14,
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97, 53, 87, 185, 134, 193, 29, 158,
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225, 248, 152, 17, 105, 217, 142, 148,
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155, 30, 135, 233, 206, 85, 40, 223,
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140, 161, 137, 13, 191, 230, 66, 104,
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65, 153, 45, 15, 176, 84, 187, 22,
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};
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// The inverse S-box
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private static readonly byte[] Si =
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{
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82, 9, 106, 213, 48, 54, 165, 56,
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191, 64, 163, 158, 129, 243, 215, 251,
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124, 227, 57, 130, 155, 47, 255, 135,
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52, 142, 67, 68, 196, 222, 233, 203,
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84, 123, 148, 50, 166, 194, 35, 61,
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238, 76, 149, 11, 66, 250, 195, 78,
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8, 46, 161, 102, 40, 217, 36, 178,
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118, 91, 162, 73, 109, 139, 209, 37,
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114, 248, 246, 100, 134, 104, 152, 22,
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212, 164, 92, 204, 93, 101, 182, 146,
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108, 112, 72, 80, 253, 237, 185, 218,
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94, 21, 70, 87, 167, 141, 157, 132,
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144, 216, 171, 0, 140, 188, 211, 10,
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247, 228, 88, 5, 184, 179, 69, 6,
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208, 44, 30, 143, 202, 63, 15, 2,
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193, 175, 189, 3, 1, 19, 138, 107,
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58, 145, 17, 65, 79, 103, 220, 234,
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151, 242, 207, 206, 240, 180, 230, 115,
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150, 172, 116, 34, 231, 173, 53, 133,
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226, 249, 55, 232, 28, 117, 223, 110,
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71, 241, 26, 113, 29, 41, 197, 137,
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111, 183, 98, 14, 170, 24, 190, 27,
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252, 86, 62, 75, 198, 210, 121, 32,
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154, 219, 192, 254, 120, 205, 90, 244,
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31, 221, 168, 51, 136, 7, 199, 49,
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177, 18, 16, 89, 39, 128, 236, 95,
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96, 81, 127, 169, 25, 181, 74, 13,
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45, 229, 122, 159, 147, 201, 156, 239,
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160, 224, 59, 77, 174, 42, 245, 176,
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200, 235, 187, 60, 131, 83, 153, 97,
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23, 43, 4, 126, 186, 119, 214, 38,
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225, 105, 20, 99, 85, 33, 12, 125,
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};
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// vector used in calculating key schedule (powers of x in GF(256))
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private static readonly int[] rcon = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
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0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91 };
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// precomputation tables of calculations for rounds
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private static readonly int[] T0 =
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{
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unchecked((int) 0xa56363c6), unchecked((int) 0x847c7cf8), unchecked((int) 0x997777ee), unchecked((int) 0x8d7b7bf6), unchecked((int) 0x0df2f2ff),
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unchecked((int) 0xbd6b6bd6), unchecked((int) 0xb16f6fde), unchecked((int) 0x54c5c591), unchecked((int) 0x50303060), unchecked((int) 0x03010102),
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unchecked((int) 0xa96767ce), unchecked((int) 0x7d2b2b56), unchecked((int) 0x19fefee7), unchecked((int) 0x62d7d7b5), unchecked((int) 0xe6abab4d),
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unchecked((int) 0x9a7676ec), unchecked((int) 0x45caca8f), unchecked((int) 0x9d82821f), unchecked((int) 0x40c9c989), unchecked((int) 0x877d7dfa),
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unchecked((int) 0x15fafaef), unchecked((int) 0xeb5959b2), unchecked((int) 0xc947478e), unchecked((int) 0x0bf0f0fb), unchecked((int) 0xecadad41),
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unchecked((int) 0x67d4d4b3), unchecked((int) 0xfda2a25f), unchecked((int) 0xeaafaf45), unchecked((int) 0xbf9c9c23), unchecked((int) 0xf7a4a453),
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unchecked((int) 0x967272e4), unchecked((int) 0x5bc0c09b), unchecked((int) 0xc2b7b775), unchecked((int) 0x1cfdfde1), unchecked((int) 0xae93933d),
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unchecked((int) 0x6a26264c), unchecked((int) 0x5a36366c), unchecked((int) 0x413f3f7e), unchecked((int) 0x02f7f7f5), unchecked((int) 0x4fcccc83),
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unchecked((int) 0x5c343468), unchecked((int) 0xf4a5a551), unchecked((int) 0x34e5e5d1), unchecked((int) 0x08f1f1f9), unchecked((int) 0x937171e2),
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unchecked((int) 0x73d8d8ab), unchecked((int) 0x53313162), unchecked((int) 0x3f15152a), unchecked((int) 0x0c040408), unchecked((int) 0x52c7c795),
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unchecked((int) 0x65232346), unchecked((int) 0x5ec3c39d), unchecked((int) 0x28181830), unchecked((int) 0xa1969637), unchecked((int) 0x0f05050a),
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unchecked((int) 0xb59a9a2f), unchecked((int) 0x0907070e), unchecked((int) 0x36121224), unchecked((int) 0x9b80801b), unchecked((int) 0x3de2e2df),
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unchecked((int) 0x26ebebcd), unchecked((int) 0x6927274e), unchecked((int) 0xcdb2b27f), unchecked((int) 0x9f7575ea), unchecked((int) 0x1b090912),
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unchecked((int) 0x9e83831d), unchecked((int) 0x742c2c58), unchecked((int) 0x2e1a1a34), unchecked((int) 0x2d1b1b36), unchecked((int) 0xb26e6edc),
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unchecked((int) 0xee5a5ab4), unchecked((int) 0xfba0a05b), unchecked((int) 0xf65252a4), unchecked((int) 0x4d3b3b76), unchecked((int) 0x61d6d6b7),
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unchecked((int) 0xceb3b37d), unchecked((int) 0x7b292952), unchecked((int) 0x3ee3e3dd), unchecked((int) 0x712f2f5e), unchecked((int) 0x97848413),
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unchecked((int) 0xf55353a6), unchecked((int) 0x68d1d1b9), unchecked((int) 0x00000000), unchecked((int) 0x2cededc1), unchecked((int) 0x60202040),
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unchecked((int) 0x1ffcfce3), unchecked((int) 0xc8b1b179), unchecked((int) 0xed5b5bb6), unchecked((int) 0xbe6a6ad4), unchecked((int) 0x46cbcb8d),
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unchecked((int) 0xd9bebe67), unchecked((int) 0x4b393972), unchecked((int) 0xde4a4a94), unchecked((int) 0xd44c4c98), unchecked((int) 0xe85858b0),
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unchecked((int) 0x4acfcf85), unchecked((int) 0x6bd0d0bb), unchecked((int) 0x2aefefc5), unchecked((int) 0xe5aaaa4f), unchecked((int) 0x16fbfbed),
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unchecked((int) 0xc5434386), unchecked((int) 0xd74d4d9a), unchecked((int) 0x55333366), unchecked((int) 0x94858511), unchecked((int) 0xcf45458a),
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unchecked((int) 0x10f9f9e9), unchecked((int) 0x06020204), unchecked((int) 0x817f7ffe), unchecked((int) 0xf05050a0), unchecked((int) 0x443c3c78),
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unchecked((int) 0xba9f9f25), unchecked((int) 0xe3a8a84b), unchecked((int) 0xf35151a2), unchecked((int) 0xfea3a35d), unchecked((int) 0xc0404080),
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unchecked((int) 0x8a8f8f05), unchecked((int) 0xad92923f), unchecked((int) 0xbc9d9d21), unchecked((int) 0x48383870), unchecked((int) 0x04f5f5f1),
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unchecked((int) 0xdfbcbc63), unchecked((int) 0xc1b6b677), unchecked((int) 0x75dadaaf), unchecked((int) 0x63212142), unchecked((int) 0x30101020),
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unchecked((int) 0x1affffe5), unchecked((int) 0x0ef3f3fd), unchecked((int) 0x6dd2d2bf), unchecked((int) 0x4ccdcd81), unchecked((int) 0x140c0c18),
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unchecked((int) 0x35131326), unchecked((int) 0x2fececc3), unchecked((int) 0xe15f5fbe), unchecked((int) 0xa2979735), unchecked((int) 0xcc444488),
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unchecked((int) 0x3917172e), unchecked((int) 0x57c4c493), unchecked((int) 0xf2a7a755), unchecked((int) 0x827e7efc), unchecked((int) 0x473d3d7a),
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unchecked((int) 0xac6464c8), unchecked((int) 0xe75d5dba), unchecked((int) 0x2b191932), unchecked((int) 0x957373e6), unchecked((int) 0xa06060c0),
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unchecked((int) 0x98818119), unchecked((int) 0xd14f4f9e), unchecked((int) 0x7fdcdca3), unchecked((int) 0x66222244), unchecked((int) 0x7e2a2a54),
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unchecked((int) 0xab90903b), unchecked((int) 0x8388880b), unchecked((int) 0xca46468c), unchecked((int) 0x29eeeec7), unchecked((int) 0xd3b8b86b),
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unchecked((int) 0x3c141428), unchecked((int) 0x79dedea7), unchecked((int) 0xe25e5ebc), unchecked((int) 0x1d0b0b16), unchecked((int) 0x76dbdbad),
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unchecked((int) 0x3be0e0db), unchecked((int) 0x56323264), unchecked((int) 0x4e3a3a74), unchecked((int) 0x1e0a0a14), unchecked((int) 0xdb494992),
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unchecked((int) 0x0a06060c), unchecked((int) 0x6c242448), unchecked((int) 0xe45c5cb8), unchecked((int) 0x5dc2c29f), unchecked((int) 0x6ed3d3bd),
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unchecked((int) 0xefacac43), unchecked((int) 0xa66262c4), unchecked((int) 0xa8919139), unchecked((int) 0xa4959531), unchecked((int) 0x37e4e4d3),
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unchecked((int) 0x8b7979f2), unchecked((int) 0x32e7e7d5), unchecked((int) 0x43c8c88b), unchecked((int) 0x5937376e), unchecked((int) 0xb76d6dda),
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unchecked((int) 0x8c8d8d01), unchecked((int) 0x64d5d5b1), unchecked((int) 0xd24e4e9c), unchecked((int) 0xe0a9a949), unchecked((int) 0xb46c6cd8),
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unchecked((int) 0xfa5656ac), unchecked((int) 0x07f4f4f3), unchecked((int) 0x25eaeacf), unchecked((int) 0xaf6565ca), unchecked((int) 0x8e7a7af4),
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unchecked((int) 0xe9aeae47), unchecked((int) 0x18080810), unchecked((int) 0xd5baba6f), unchecked((int) 0x887878f0), unchecked((int) 0x6f25254a),
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unchecked((int) 0x722e2e5c), unchecked((int) 0x241c1c38), unchecked((int) 0xf1a6a657), unchecked((int) 0xc7b4b473), unchecked((int) 0x51c6c697),
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unchecked((int) 0x23e8e8cb), unchecked((int) 0x7cdddda1), unchecked((int) 0x9c7474e8), unchecked((int) 0x211f1f3e), unchecked((int) 0xdd4b4b96),
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unchecked((int) 0xdcbdbd61), unchecked((int) 0x868b8b0d), unchecked((int) 0x858a8a0f), unchecked((int) 0x907070e0), unchecked((int) 0x423e3e7c),
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unchecked((int) 0xc4b5b571), unchecked((int) 0xaa6666cc), unchecked((int) 0xd8484890), unchecked((int) 0x05030306), unchecked((int) 0x01f6f6f7),
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unchecked((int) 0x120e0e1c), unchecked((int) 0xa36161c2), unchecked((int) 0x5f35356a), unchecked((int) 0xf95757ae), unchecked((int) 0xd0b9b969),
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unchecked((int) 0x91868617), unchecked((int) 0x58c1c199), unchecked((int) 0x271d1d3a), unchecked((int) 0xb99e9e27), unchecked((int) 0x38e1e1d9),
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unchecked((int) 0x13f8f8eb), unchecked((int) 0xb398982b), unchecked((int) 0x33111122), unchecked((int) 0xbb6969d2), unchecked((int) 0x70d9d9a9),
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unchecked((int) 0x898e8e07), unchecked((int) 0xa7949433), unchecked((int) 0xb69b9b2d), unchecked((int) 0x221e1e3c), unchecked((int) 0x92878715),
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unchecked((int) 0x20e9e9c9), unchecked((int) 0x49cece87), unchecked((int) 0xff5555aa), unchecked((int) 0x78282850), unchecked((int) 0x7adfdfa5),
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unchecked((int) 0x8f8c8c03), unchecked((int) 0xf8a1a159), unchecked((int) 0x80898909), unchecked((int) 0x170d0d1a), unchecked((int) 0xdabfbf65),
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unchecked((int) 0x31e6e6d7), unchecked((int) 0xc6424284), unchecked((int) 0xb86868d0), unchecked((int) 0xc3414182), unchecked((int) 0xb0999929),
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unchecked((int) 0x772d2d5a), unchecked((int) 0x110f0f1e), unchecked((int) 0xcbb0b07b), unchecked((int) 0xfc5454a8), unchecked((int) 0xd6bbbb6d),
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unchecked((int) 0x3a16162c)
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};
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private static readonly int[] Tinv0 =
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{
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unchecked((int) 0x50a7f451), unchecked((int) 0x5365417e), unchecked((int) 0xc3a4171a), unchecked((int) 0x965e273a), unchecked((int) 0xcb6bab3b),
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unchecked((int) 0xf1459d1f), unchecked((int) 0xab58faac), unchecked((int) 0x9303e34b), unchecked((int) 0x55fa3020), unchecked((int) 0xf66d76ad),
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unchecked((int) 0x9176cc88), unchecked((int) 0x254c02f5), unchecked((int) 0xfcd7e54f), unchecked((int) 0xd7cb2ac5), unchecked((int) 0x80443526),
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unchecked((int) 0x8fa362b5), unchecked((int) 0x495ab1de), unchecked((int) 0x671bba25), unchecked((int) 0x980eea45), unchecked((int) 0xe1c0fe5d),
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unchecked((int) 0x02752fc3), unchecked((int) 0x12f04c81), unchecked((int) 0xa397468d), unchecked((int) 0xc6f9d36b), unchecked((int) 0xe75f8f03),
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unchecked((int) 0x959c9215), unchecked((int) 0xeb7a6dbf), unchecked((int) 0xda595295), unchecked((int) 0x2d83bed4), unchecked((int) 0xd3217458),
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unchecked((int) 0x2969e049), unchecked((int) 0x44c8c98e), unchecked((int) 0x6a89c275), unchecked((int) 0x78798ef4), unchecked((int) 0x6b3e5899),
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unchecked((int) 0xdd71b927), unchecked((int) 0xb64fe1be), unchecked((int) 0x17ad88f0), unchecked((int) 0x66ac20c9), unchecked((int) 0xb43ace7d),
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unchecked((int) 0x184adf63), unchecked((int) 0x82311ae5), unchecked((int) 0x60335197), unchecked((int) 0x457f5362), unchecked((int) 0xe07764b1),
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unchecked((int) 0x84ae6bbb), unchecked((int) 0x1ca081fe), unchecked((int) 0x942b08f9), unchecked((int) 0x58684870), unchecked((int) 0x19fd458f),
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unchecked((int) 0x876cde94), unchecked((int) 0xb7f87b52), unchecked((int) 0x23d373ab), unchecked((int) 0xe2024b72), unchecked((int) 0x578f1fe3),
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unchecked((int) 0x2aab5566), unchecked((int) 0x0728ebb2), unchecked((int) 0x03c2b52f), unchecked((int) 0x9a7bc586), unchecked((int) 0xa50837d3),
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unchecked((int) 0xf2872830), unchecked((int) 0xb2a5bf23), unchecked((int) 0xba6a0302), unchecked((int) 0x5c8216ed), unchecked((int) 0x2b1ccf8a),
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unchecked((int) 0x92b479a7), unchecked((int) 0xf0f207f3), unchecked((int) 0xa1e2694e), unchecked((int) 0xcdf4da65), unchecked((int) 0xd5be0506),
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unchecked((int) 0x1f6234d1), unchecked((int) 0x8afea6c4), unchecked((int) 0x9d532e34), unchecked((int) 0xa055f3a2), unchecked((int) 0x32e18a05),
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unchecked((int) 0x75ebf6a4), unchecked((int) 0x39ec830b), unchecked((int) 0xaaef6040), unchecked((int) 0x069f715e), unchecked((int) 0x51106ebd),
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unchecked((int) 0xf98a213e), unchecked((int) 0x3d06dd96), unchecked((int) 0xae053edd), unchecked((int) 0x46bde64d), unchecked((int) 0xb58d5491),
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unchecked((int) 0x055dc471), unchecked((int) 0x6fd40604), unchecked((int) 0xff155060), unchecked((int) 0x24fb9819), unchecked((int) 0x97e9bdd6),
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unchecked((int) 0xcc434089), unchecked((int) 0x779ed967), unchecked((int) 0xbd42e8b0), unchecked((int) 0x888b8907), unchecked((int) 0x385b19e7),
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unchecked((int) 0xdbeec879), unchecked((int) 0x470a7ca1), unchecked((int) 0xe90f427c), unchecked((int) 0xc91e84f8), unchecked((int) 0x00000000),
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unchecked((int) 0x83868009), unchecked((int) 0x48ed2b32), unchecked((int) 0xac70111e), unchecked((int) 0x4e725a6c), unchecked((int) 0xfbff0efd),
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unchecked((int) 0x5638850f), unchecked((int) 0x1ed5ae3d), unchecked((int) 0x27392d36), unchecked((int) 0x64d90f0a), unchecked((int) 0x21a65c68),
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unchecked((int) 0xd1545b9b), unchecked((int) 0x3a2e3624), unchecked((int) 0xb1670a0c), unchecked((int) 0x0fe75793), unchecked((int) 0xd296eeb4),
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unchecked((int) 0x9e919b1b), unchecked((int) 0x4fc5c080), unchecked((int) 0xa220dc61), unchecked((int) 0x694b775a), unchecked((int) 0x161a121c),
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unchecked((int) 0x0aba93e2), unchecked((int) 0xe52aa0c0), unchecked((int) 0x43e0223c), unchecked((int) 0x1d171b12), unchecked((int) 0x0b0d090e),
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unchecked((int) 0xadc78bf2), unchecked((int) 0xb9a8b62d), unchecked((int) 0xc8a91e14), unchecked((int) 0x8519f157), unchecked((int) 0x4c0775af),
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unchecked((int) 0xbbdd99ee), unchecked((int) 0xfd607fa3), unchecked((int) 0x9f2601f7), unchecked((int) 0xbcf5725c), unchecked((int) 0xc53b6644),
|
|
unchecked((int) 0x347efb5b), unchecked((int) 0x7629438b), unchecked((int) 0xdcc623cb), unchecked((int) 0x68fcedb6), unchecked((int) 0x63f1e4b8),
|
|
unchecked((int) 0xcadc31d7), unchecked((int) 0x10856342), unchecked((int) 0x40229713), unchecked((int) 0x2011c684), unchecked((int) 0x7d244a85),
|
|
unchecked((int) 0xf83dbbd2), unchecked((int) 0x1132f9ae), unchecked((int) 0x6da129c7), unchecked((int) 0x4b2f9e1d), unchecked((int) 0xf330b2dc),
|
|
unchecked((int) 0xec52860d), unchecked((int) 0xd0e3c177), unchecked((int) 0x6c16b32b), unchecked((int) 0x99b970a9), unchecked((int) 0xfa489411),
|
|
unchecked((int) 0x2264e947), unchecked((int) 0xc48cfca8), unchecked((int) 0x1a3ff0a0), unchecked((int) 0xd82c7d56), unchecked((int) 0xef903322),
|
|
unchecked((int) 0xc74e4987), unchecked((int) 0xc1d138d9), unchecked((int) 0xfea2ca8c), unchecked((int) 0x360bd498), unchecked((int) 0xcf81f5a6),
|
|
unchecked((int) 0x28de7aa5), unchecked((int) 0x268eb7da), unchecked((int) 0xa4bfad3f), unchecked((int) 0xe49d3a2c), unchecked((int) 0x0d927850),
|
|
unchecked((int) 0x9bcc5f6a), unchecked((int) 0x62467e54), unchecked((int) 0xc2138df6), unchecked((int) 0xe8b8d890), unchecked((int) 0x5ef7392e),
|
|
unchecked((int) 0xf5afc382), unchecked((int) 0xbe805d9f), unchecked((int) 0x7c93d069), unchecked((int) 0xa92dd56f), unchecked((int) 0xb31225cf),
|
|
unchecked((int) 0x3b99acc8), unchecked((int) 0xa77d1810), unchecked((int) 0x6e639ce8), unchecked((int) 0x7bbb3bdb), unchecked((int) 0x097826cd),
|
|
unchecked((int) 0xf418596e), unchecked((int) 0x01b79aec), unchecked((int) 0xa89a4f83), unchecked((int) 0x656e95e6), unchecked((int) 0x7ee6ffaa),
|
|
unchecked((int) 0x08cfbc21), unchecked((int) 0xe6e815ef), unchecked((int) 0xd99be7ba), unchecked((int) 0xce366f4a), unchecked((int) 0xd4099fea),
|
|
unchecked((int) 0xd67cb029), unchecked((int) 0xafb2a431), unchecked((int) 0x31233f2a), unchecked((int) 0x3094a5c6), unchecked((int) 0xc066a235),
|
|
unchecked((int) 0x37bc4e74), unchecked((int) 0xa6ca82fc), unchecked((int) 0xb0d090e0), unchecked((int) 0x15d8a733), unchecked((int) 0x4a9804f1),
|
|
unchecked((int) 0xf7daec41), unchecked((int) 0x0e50cd7f), unchecked((int) 0x2ff69117), unchecked((int) 0x8dd64d76), unchecked((int) 0x4db0ef43),
|
|
unchecked((int) 0x544daacc), unchecked((int) 0xdf0496e4), unchecked((int) 0xe3b5d19e), unchecked((int) 0x1b886a4c), unchecked((int) 0xb81f2cc1),
|
|
unchecked((int) 0x7f516546), unchecked((int) 0x04ea5e9d), unchecked((int) 0x5d358c01), unchecked((int) 0x737487fa), unchecked((int) 0x2e410bfb),
|
|
unchecked((int) 0x5a1d67b3), unchecked((int) 0x52d2db92), unchecked((int) 0x335610e9), unchecked((int) 0x1347d66d), unchecked((int) 0x8c61d79a),
|
|
unchecked((int) 0x7a0ca137), unchecked((int) 0x8e14f859), unchecked((int) 0x893c13eb), unchecked((int) 0xee27a9ce), unchecked((int) 0x35c961b7),
|
|
unchecked((int) 0xede51ce1), unchecked((int) 0x3cb1477a), unchecked((int) 0x59dfd29c), unchecked((int) 0x3f73f255), unchecked((int) 0x79ce1418),
|
|
unchecked((int) 0xbf37c773), unchecked((int) 0xeacdf753), unchecked((int) 0x5baafd5f), unchecked((int) 0x146f3ddf), unchecked((int) 0x86db4478),
|
|
unchecked((int) 0x81f3afca), unchecked((int) 0x3ec468b9), unchecked((int) 0x2c342438), unchecked((int) 0x5f40a3c2), unchecked((int) 0x72c31d16),
|
|
unchecked((int) 0x0c25e2bc), unchecked((int) 0x8b493c28), unchecked((int) 0x41950dff), unchecked((int) 0x7101a839), unchecked((int) 0xdeb30c08),
|
|
unchecked((int) 0x9ce4b4d8), unchecked((int) 0x90c15664), unchecked((int) 0x6184cb7b), unchecked((int) 0x70b632d5), unchecked((int) 0x745c6c48),
|
|
unchecked((int) 0x4257b8d0)
|
|
};
|
|
|
|
private int Shift(
|
|
int r,
|
|
int shift)
|
|
{
|
|
return ((int)(((uint) r >> shift) | (uint)(r << (32 - shift))));
|
|
}
|
|
|
|
/* multiply four bytes in GF(2^8) by 'x' {02} in parallel */
|
|
|
|
private const int m1 = unchecked((int) 0x80808080);
|
|
private const int m2 = unchecked((int) 0x7f7f7f7f);
|
|
private const int m3 = unchecked((int) 0x0000001b);
|
|
|
|
private int FFmulX(
|
|
int x)
|
|
{
|
|
return ((int) (((x & m2) << 1) ^ (( (uint) (x & m1) >> 7) * m3)));
|
|
}
|
|
|
|
|
|
/*
|
|
The following defines provide alternative definitions of FFmulX that might
|
|
give improved performance if a fast 32-bit multiply is not available.
|
|
|
|
private int FFmulX(int x) { int u = x & m1; u |= (u >> 1); return ((x & m2) << 1) ^ ((u >>> 3) | (u >>> 6)); }
|
|
private static final int m4 = 0x1b1b1b1b;
|
|
private int FFmulX(int x) { int u = x & m1; return ((x & m2) << 1) ^ ((u - (u >>> 7)) & m4); }
|
|
|
|
*/
|
|
|
|
private int Inv_Mcol(
|
|
int x)
|
|
{
|
|
int f2 = FFmulX(x);
|
|
int f4 = FFmulX(f2);
|
|
int f8 = FFmulX(f4);
|
|
int f9 = x ^ f8;
|
|
|
|
return f2 ^ f4 ^ f8 ^ Shift(f2 ^ f9, 8) ^ Shift(f4 ^ f9, 16) ^ Shift(f9, 24);
|
|
}
|
|
|
|
private int SubWord(int x) {
|
|
return (S[x&255]&255 | ((S[(x>>8)&255]&255)<<8) | ((S[(x>>16)&255]&255)<<16) | S[(x>>24)&255]<<24);
|
|
}
|
|
|
|
/**
|
|
* Calculate the necessary round keys
|
|
* The number of calculations depends on key size and block size
|
|
* AES specified a fixed block size of 128 bits and key sizes 128/192/256 bits
|
|
* This code is written assuming those are the only possible values
|
|
*/
|
|
private int[,] GenerateWorkingKey(
|
|
byte[] key,
|
|
bool forEncryption)
|
|
{
|
|
int KC = key.Length / 4; // key length in words
|
|
int t;
|
|
|
|
if ((KC != 4) && (KC != 6) && (KC != 8)) {
|
|
throw new ArgumentException("Key length not 128/192/256 bits.");
|
|
}
|
|
|
|
ROUNDS = KC + 6; // This is not always true for the generalized Rijndael that allows larger block sizes
|
|
int[,] W = new int[ROUNDS+1, 4]; // 4 words in a block
|
|
|
|
//
|
|
// copy the key into the round key array
|
|
//
|
|
|
|
t = 0;
|
|
for (int i = 0; i < key.Length; t++)
|
|
{
|
|
W[t >> 2, t & 3] = (key[i]&0xff) | ((key[i+1]&0xff) << 8) | ((key[i+2]&0xff) << 16) | (key[i+3] << 24);
|
|
i+=4;
|
|
}
|
|
|
|
//
|
|
// while not enough round key material calculated
|
|
// calculate new values
|
|
//
|
|
int k = (ROUNDS + 1) << 2;
|
|
for (int i = KC; (i < k); i++)
|
|
{
|
|
int temp = W[(i-1)>>2, (i-1)&3];
|
|
if ((i % KC) == 0) {
|
|
temp = SubWord(Shift(temp, 8)) ^ rcon[(i / KC)-1];
|
|
} else if ((KC > 6) && ((i % KC) == 4)) {
|
|
temp = SubWord(temp);
|
|
}
|
|
|
|
W[i>>2, i&3] = W[(i - KC)>>2, (i-KC)&3] ^ temp;
|
|
}
|
|
|
|
if (!forEncryption)
|
|
{
|
|
for (int j = 1; j < ROUNDS; j++)
|
|
{
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
W[j, i] = Inv_Mcol(W[j, i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
return W;
|
|
}
|
|
|
|
private int ROUNDS;
|
|
private int[,] WorkingKey;
|
|
private int C0, C1, C2, C3;
|
|
private bool forEncryption;
|
|
|
|
private const int BLOCK_SIZE = 16;
|
|
|
|
/**
|
|
* default constructor - 128 bit block size.
|
|
*/
|
|
public AesEngine()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* initialise an AES cipher.
|
|
*
|
|
* @param forEncryption whether or not we are for encryption.
|
|
* @param parameters the parameters required to set up the cipher.
|
|
* @exception ArgumentException if the parameters argument is
|
|
* inappropriate.
|
|
*/
|
|
public void Init(
|
|
bool forEncryption,
|
|
ICipherParameters parameters)
|
|
{
|
|
KeyParameter keyParameter = parameters as KeyParameter;
|
|
|
|
if (keyParameter == null)
|
|
throw new ArgumentException("invalid parameter passed to AES init - " + parameters.GetType().Name);
|
|
|
|
WorkingKey = GenerateWorkingKey(keyParameter.GetKey(), forEncryption);
|
|
|
|
this.forEncryption = forEncryption;
|
|
}
|
|
|
|
public string AlgorithmName
|
|
{
|
|
get { return "AES"; }
|
|
}
|
|
|
|
public bool IsPartialBlockOkay
|
|
{
|
|
get { return false; }
|
|
}
|
|
|
|
public int GetBlockSize()
|
|
{
|
|
return BLOCK_SIZE;
|
|
}
|
|
|
|
public int ProcessBlock(
|
|
byte[] input,
|
|
int inOff,
|
|
byte[] output,
|
|
int outOff)
|
|
{
|
|
if (WorkingKey == null)
|
|
{
|
|
throw new InvalidOperationException("AES engine not initialised");
|
|
}
|
|
|
|
if ((inOff + (32 / 2)) > input.Length)
|
|
{
|
|
throw new DataLengthException("input buffer too short");
|
|
}
|
|
|
|
if ((outOff + (32 / 2)) > output.Length)
|
|
{
|
|
throw new DataLengthException("output buffer too short");
|
|
}
|
|
|
|
UnPackBlock(input, inOff);
|
|
|
|
if (forEncryption)
|
|
{
|
|
EncryptBlock(WorkingKey);
|
|
}
|
|
else
|
|
{
|
|
DecryptBlock(WorkingKey);
|
|
}
|
|
|
|
PackBlock(output, outOff);
|
|
|
|
return BLOCK_SIZE;
|
|
}
|
|
|
|
public void Reset()
|
|
{
|
|
}
|
|
|
|
private void UnPackBlock(
|
|
byte[] bytes,
|
|
int off)
|
|
{
|
|
int index = off;
|
|
|
|
C0 = (bytes[index++] & 0xff);
|
|
C0 |= (bytes[index++] & 0xff) << 8;
|
|
C0 |= (bytes[index++] & 0xff) << 16;
|
|
C0 |= bytes[index++] << 24;
|
|
|
|
C1 = (bytes[index++] & 0xff);
|
|
C1 |= (bytes[index++] & 0xff) << 8;
|
|
C1 |= (bytes[index++] & 0xff) << 16;
|
|
C1 |= bytes[index++] << 24;
|
|
|
|
C2 = (bytes[index++] & 0xff);
|
|
C2 |= (bytes[index++] & 0xff) << 8;
|
|
C2 |= (bytes[index++] & 0xff) << 16;
|
|
C2 |= bytes[index++] << 24;
|
|
|
|
C3 = (bytes[index++] & 0xff);
|
|
C3 |= (bytes[index++] & 0xff) << 8;
|
|
C3 |= (bytes[index++] & 0xff) << 16;
|
|
C3 |= bytes[index++] << 24;
|
|
}
|
|
|
|
private void PackBlock(
|
|
byte[] bytes,
|
|
int off)
|
|
{
|
|
int index = off;
|
|
|
|
bytes[index++] = (byte)C0;
|
|
bytes[index++] = (byte)(C0 >> 8);
|
|
bytes[index++] = (byte)(C0 >> 16);
|
|
bytes[index++] = (byte)(C0 >> 24);
|
|
|
|
bytes[index++] = (byte)C1;
|
|
bytes[index++] = (byte)(C1 >> 8);
|
|
bytes[index++] = (byte)(C1 >> 16);
|
|
bytes[index++] = (byte)(C1 >> 24);
|
|
|
|
bytes[index++] = (byte)C2;
|
|
bytes[index++] = (byte)(C2 >> 8);
|
|
bytes[index++] = (byte)(C2 >> 16);
|
|
bytes[index++] = (byte)(C2 >> 24);
|
|
|
|
bytes[index++] = (byte)C3;
|
|
bytes[index++] = (byte)(C3 >> 8);
|
|
bytes[index++] = (byte)(C3 >> 16);
|
|
bytes[index++] = (byte)(C3 >> 24);
|
|
}
|
|
|
|
private void EncryptBlock(
|
|
int[,] KW)
|
|
{
|
|
int r, r0, r1, r2, r3;
|
|
|
|
C0 ^= KW[0, 0];
|
|
C1 ^= KW[0, 1];
|
|
C2 ^= KW[0, 2];
|
|
C3 ^= KW[0, 3];
|
|
|
|
for (r = 1; r < ROUNDS - 1;)
|
|
{
|
|
r0 = T0[C0&255] ^ Shift(T0[(C1>>8)&255], 24) ^ Shift(T0[(C2>>16)&255],16) ^ Shift(T0[(C3>>24)&255],8) ^ KW[r,0];
|
|
r1 = T0[C1&255] ^ Shift(T0[(C2>>8)&255], 24) ^ Shift(T0[(C3>>16)&255], 16) ^ Shift(T0[(C0>>24)&255], 8) ^ KW[r,1];
|
|
r2 = T0[C2&255] ^ Shift(T0[(C3>>8)&255], 24) ^ Shift(T0[(C0>>16)&255], 16) ^ Shift(T0[(C1>>24)&255], 8) ^ KW[r,2];
|
|
r3 = T0[C3&255] ^ Shift(T0[(C0>>8)&255], 24) ^ Shift(T0[(C1>>16)&255], 16) ^ Shift(T0[(C2>>24)&255], 8) ^ KW[r++,3];
|
|
C0 = T0[r0&255] ^ Shift(T0[(r1>>8)&255], 24) ^ Shift(T0[(r2>>16)&255], 16) ^ Shift(T0[(r3>>24)&255], 8) ^ KW[r,0];
|
|
C1 = T0[r1&255] ^ Shift(T0[(r2>>8)&255], 24) ^ Shift(T0[(r3>>16)&255], 16) ^ Shift(T0[(r0>>24)&255], 8) ^ KW[r,1];
|
|
C2 = T0[r2&255] ^ Shift(T0[(r3>>8)&255], 24) ^ Shift(T0[(r0>>16)&255], 16) ^ Shift(T0[(r1>>24)&255], 8) ^ KW[r,2];
|
|
C3 = T0[r3&255] ^ Shift(T0[(r0>>8)&255], 24) ^ Shift(T0[(r1>>16)&255], 16) ^ Shift(T0[(r2>>24)&255], 8) ^ KW[r++,3];
|
|
}
|
|
|
|
r0 = T0[C0&255] ^ Shift(T0[(C1>>8)&255], 24) ^ Shift(T0[(C2>>16)&255], 16) ^ Shift(T0[(C3>>24)&255], 8) ^ KW[r,0];
|
|
r1 = T0[C1&255] ^ Shift(T0[(C2>>8)&255], 24) ^ Shift(T0[(C3>>16)&255], 16) ^ Shift(T0[(C0>>24)&255], 8) ^ KW[r,1];
|
|
r2 = T0[C2&255] ^ Shift(T0[(C3>>8)&255], 24) ^ Shift(T0[(C0>>16)&255], 16) ^ Shift(T0[(C1>>24)&255], 8) ^ KW[r,2];
|
|
r3 = T0[C3&255] ^ Shift(T0[(C0>>8)&255], 24) ^ Shift(T0[(C1>>16)&255], 16) ^ Shift(T0[(C2>>24)&255], 8) ^ KW[r++,3];
|
|
|
|
// the final round's table is a simple function of S so we don't use a whole other four tables for it
|
|
|
|
C0 = (S[r0&255]&255) ^ ((S[(r1>>8)&255]&255)<<8) ^ ((S[(r2>>16)&255]&255)<<16) ^ (S[(r3>>24)&255]<<24) ^ KW[r,0];
|
|
C1 = (S[r1&255]&255) ^ ((S[(r2>>8)&255]&255)<<8) ^ ((S[(r3>>16)&255]&255)<<16) ^ (S[(r0>>24)&255]<<24) ^ KW[r,1];
|
|
C2 = (S[r2&255]&255) ^ ((S[(r3>>8)&255]&255)<<8) ^ ((S[(r0>>16)&255]&255)<<16) ^ (S[(r1>>24)&255]<<24) ^ KW[r,2];
|
|
C3 = (S[r3&255]&255) ^ ((S[(r0>>8)&255]&255)<<8) ^ ((S[(r1>>16)&255]&255)<<16) ^ (S[(r2>>24)&255]<<24) ^ KW[r,3];
|
|
}
|
|
|
|
private void DecryptBlock(
|
|
int[,] KW)
|
|
{
|
|
int r, r0, r1, r2, r3;
|
|
|
|
C0 ^= KW[ROUNDS,0];
|
|
C1 ^= KW[ROUNDS,1];
|
|
C2 ^= KW[ROUNDS,2];
|
|
C3 ^= KW[ROUNDS,3];
|
|
|
|
for (r = ROUNDS-1; r>1;)
|
|
{
|
|
r0 = Tinv0[C0&255] ^ Shift(Tinv0[(C3>>8)&255], 24) ^ Shift(Tinv0[(C2>>16)&255], 16) ^ Shift(Tinv0[(C1>>24)&255], 8) ^ KW[r,0];
|
|
r1 = Tinv0[C1&255] ^ Shift(Tinv0[(C0>>8)&255], 24) ^ Shift(Tinv0[(C3>>16)&255], 16) ^ Shift(Tinv0[(C2>>24)&255], 8) ^ KW[r,1];
|
|
r2 = Tinv0[C2&255] ^ Shift(Tinv0[(C1>>8)&255], 24) ^ Shift(Tinv0[(C0>>16)&255], 16) ^ Shift(Tinv0[(C3>>24)&255], 8) ^ KW[r,2];
|
|
r3 = Tinv0[C3&255] ^ Shift(Tinv0[(C2>>8)&255], 24) ^ Shift(Tinv0[(C1>>16)&255], 16) ^ Shift(Tinv0[(C0>>24)&255], 8) ^ KW[r--,3];
|
|
C0 = Tinv0[r0&255] ^ Shift(Tinv0[(r3>>8)&255], 24) ^ Shift(Tinv0[(r2>>16)&255], 16) ^ Shift(Tinv0[(r1>>24)&255], 8) ^ KW[r,0];
|
|
C1 = Tinv0[r1&255] ^ Shift(Tinv0[(r0>>8)&255], 24) ^ Shift(Tinv0[(r3>>16)&255], 16) ^ Shift(Tinv0[(r2>>24)&255], 8) ^ KW[r,1];
|
|
C2 = Tinv0[r2&255] ^ Shift(Tinv0[(r1>>8)&255], 24) ^ Shift(Tinv0[(r0>>16)&255], 16) ^ Shift(Tinv0[(r3>>24)&255], 8) ^ KW[r,2];
|
|
C3 = Tinv0[r3&255] ^ Shift(Tinv0[(r2>>8)&255], 24) ^ Shift(Tinv0[(r1>>16)&255], 16) ^ Shift(Tinv0[(r0>>24)&255], 8) ^ KW[r--,3];
|
|
}
|
|
|
|
r0 = Tinv0[C0&255] ^ Shift(Tinv0[(C3>>8)&255], 24) ^ Shift(Tinv0[(C2>>16)&255], 16) ^ Shift(Tinv0[(C1>>24)&255], 8) ^ KW[r,0];
|
|
r1 = Tinv0[C1&255] ^ Shift(Tinv0[(C0>>8)&255], 24) ^ Shift(Tinv0[(C3>>16)&255], 16) ^ Shift(Tinv0[(C2>>24)&255], 8) ^ KW[r,1];
|
|
r2 = Tinv0[C2&255] ^ Shift(Tinv0[(C1>>8)&255], 24) ^ Shift(Tinv0[(C0>>16)&255], 16) ^ Shift(Tinv0[(C3>>24)&255], 8) ^ KW[r,2];
|
|
r3 = Tinv0[C3&255] ^ Shift(Tinv0[(C2>>8)&255], 24) ^ Shift(Tinv0[(C1>>16)&255], 16) ^ Shift(Tinv0[(C0>>24)&255], 8) ^ KW[r,3];
|
|
|
|
// the final round's table is a simple function of Si so we don't use a whole other four tables for it
|
|
|
|
C0 = (Si[r0&255]&255) ^ ((Si[(r3>>8)&255]&255)<<8) ^ ((Si[(r2>>16)&255]&255)<<16) ^ (Si[(r1>>24)&255]<<24) ^ KW[0,0];
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C1 = (Si[r1&255]&255) ^ ((Si[(r0>>8)&255]&255)<<8) ^ ((Si[(r3>>16)&255]&255)<<16) ^ (Si[(r2>>24)&255]<<24) ^ KW[0,1];
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C2 = (Si[r2&255]&255) ^ ((Si[(r1>>8)&255]&255)<<8) ^ ((Si[(r0>>16)&255]&255)<<16) ^ (Si[(r3>>24)&255]<<24) ^ KW[0,2];
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C3 = (Si[r3&255]&255) ^ ((Si[(r2>>8)&255]&255)<<8) ^ ((Si[(r1>>16)&255]&255)<<16) ^ (Si[(r0>>24)&255]<<24) ^ KW[0,3];
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}
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}
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}
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