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