学密码编码时写的一段，把编码的部分写到这里，cbc模式，填充方式是pkcs7,有需要解码或者sbox自动生成或者有限域加减乘除实现的可以留言。
这本书上描述的很详细：密码编码学与网络安全（第五版） 网上有英文版的pdf
网上资料可以参考下面的：
http://www.users.zetnet.co.uk/hopwood/crypto/scan/cs.html#pad_PKCSPadding
http://en.wikipedia.org/wiki/AES_implementations#C.2FASM_library
http://en.wikipedia.org/wiki/Advanced_Encryption_Standard
aes128enc.h
#ifndef __AES128_ENC_H__ #define __AES128_ENC_H__ #include<stdio.h> #define ROTATE_LEFT(x, s, n) ((x) << (n))|((x) >> ((s) - (n))) #define ROTATE_RIGHT(x, s, n) ((x) >> (n))|((x) << ((s) - (n))) #define IRR_POLY8 0x001B typedef unsigned char byte_t; typedef unsigned int word_t; typedef union{ word_t w; byte_t b[4]; }bw; typedef union{ word_t w[4]; byte_t b[16]; }bw4; static const byte_t RC[10]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36}; word_t W[11*4];//4x4x11 byte static byte_t sbox[16*16]= { 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 }; static const bw sm0[256]= { 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 }; static const bw sm1[256]= { 0x6363c6a5,0x7c7cf884,0x7777ee99,0x7b7bf68d,0xf2f2ff0d,0x6b6bd6bd,0x6f6fdeb1,0xc5c59154, 0x30306050,0x01010203,0x6767cea9,0x2b2b567d,0xfefee719,0xd7d7b562,0xabab4de6,0x7676ec9a, 0xcaca8f45,0x82821f9d,0xc9c98940,0x7d7dfa87,0xfafaef15,0x5959b2eb,0x47478ec9,0xf0f0fb0b, 0xadad41ec,0xd4d4b367,0xa2a25ffd,0xafaf45ea,0x9c9c23bf,0xa4a453f7,0x7272e496,0xc0c09b5b, 0xb7b775c2,0xfdfde11c,0x93933dae,0x26264c6a,0x36366c5a,0x3f3f7e41,0xf7f7f502,0xcccc834f, 0x3434685c,0xa5a551f4,0xe5e5d134,0xf1f1f908,0x7171e293,0xd8d8ab73,0x31316253,0x15152a3f, 0x0404080c,0xc7c79552,0x23234665,0xc3c39d5e,0x18183028,0x969637a1,0x05050a0f,0x9a9a2fb5, 0x07070e09,0x12122436,0x80801b9b,0xe2e2df3d,0xebebcd26,0x27274e69,0xb2b27fcd,0x7575ea9f, 0x0909121b,0x83831d9e,0x2c2c5874,0x1a1a342e,0x1b1b362d,0x6e6edcb2,0x5a5ab4ee,0xa0a05bfb, 0x5252a4f6,0x3b3b764d,0xd6d6b761,0xb3b37dce,0x2929527b,0xe3e3dd3e,0x2f2f5e71,0x84841397, 0x5353a6f5,0xd1d1b968,0x00000000,0xededc12c,0x20204060,0xfcfce31f,0xb1b179c8,0x5b5bb6ed, 0x6a6ad4be,0xcbcb8d46,0xbebe67d9,0x3939724b,0x4a4a94de,0x4c4c98d4,0x5858b0e8,0xcfcf854a, 0xd0d0bb6b,0xefefc52a,0xaaaa4fe5,0xfbfbed16,0x434386c5,0x4d4d9ad7,0x33336655,0x85851194, 0x45458acf,0xf9f9e910,0x02020406,0x7f7ffe81,0x5050a0f0,0x3c3c7844,0x9f9f25ba,0xa8a84be3, 0x5151a2f3,0xa3a35dfe,0x404080c0,0x8f8f058a,0x92923fad,0x9d9d21bc,0x38387048,0xf5f5f104, 0xbcbc63df,0xb6b677c1,0xdadaaf75,0x21214263,0x10102030,0xffffe51a,0xf3f3fd0e,0xd2d2bf6d, 0xcdcd814c,0x0c0c1814,0x13132635,0xececc32f,0x5f5fbee1,0x979735a2,0x444488cc,0x17172e39, 0xc4c49357,0xa7a755f2,0x7e7efc82,0x3d3d7a47,0x6464c8ac,0x5d5dbae7,0x1919322b,0x7373e695, 0x6060c0a0,0x81811998,0x4f4f9ed1,0xdcdca37f,0x22224466,0x2a2a547e,0x90903bab,0x88880b83, 0x46468cca,0xeeeec729,0xb8b86bd3,0x1414283c,0xdedea779,0x5e5ebce2,0x0b0b161d,0xdbdbad76, 0xe0e0db3b,0x32326456,0x3a3a744e,0x0a0a141e,0x494992db,0x06060c0a,0x2424486c,0x5c5cb8e4, 0xc2c29f5d,0xd3d3bd6e,0xacac43ef,0x6262c4a6,0x919139a8,0x959531a4,0xe4e4d337,0x7979f28b, 0xe7e7d532,0xc8c88b43,0x37376e59,0x6d6ddab7,0x8d8d018c,0xd5d5b164,0x4e4e9cd2,0xa9a949e0, 0x6c6cd8b4,0x5656acfa,0xf4f4f307,0xeaeacf25,0x6565caaf,0x7a7af48e,0xaeae47e9,0x08081018, 0xbaba6fd5,0x7878f088,0x25254a6f,0x2e2e5c72,0x1c1c3824,0xa6a657f1,0xb4b473c7,0xc6c69751, 0xe8e8cb23,0xdddda17c,0x7474e89c,0x1f1f3e21,0x4b4b96dd,0xbdbd61dc,0x8b8b0d86,0x8a8a0f85, 0x7070e090,0x3e3e7c42,0xb5b571c4,0x6666ccaa,0x484890d8,0x03030605,0xf6f6f701,0x0e0e1c12, 0x6161c2a3,0x35356a5f,0x5757aef9,0xb9b969d0,0x86861791,0xc1c19958,0x1d1d3a27,0x9e9e27b9, 0xe1e1d938,0xf8f8eb13,0x98982bb3,0x11112233,0x6969d2bb,0xd9d9a970,0x8e8e0789,0x949433a7, 0x9b9b2db6,0x1e1e3c22,0x87871592,0xe9e9c920,0xcece8749,0x5555aaff,0x28285078,0xdfdfa57a, 0x8c8c038f,0xa1a159f8,0x89890980,0x0d0d1a17,0xbfbf65da,0xe6e6d731,0x424284c6,0x6868d0b8, 0x414182c3,0x999929b0,0x2d2d5a77,0x0f0f1e11,0xb0b07bcb,0x5454a8fc,0xbbbb6dd6,0x16162c3a }; static const bw sm2[256]= { 0x63c6a563,0x7cf8847c,0x77ee9977,0x7bf68d7b,0xf2ff0df2,0x6bd6bd6b,0x6fdeb16f,0xc59154c5, 0x30605030,0x01020301,0x67cea967,0x2b567d2b,0xfee719fe,0xd7b562d7,0xab4de6ab,0x76ec9a76, 0xca8f45ca,0x821f9d82,0xc98940c9,0x7dfa877d,0xfaef15fa,0x59b2eb59,0x478ec947,0xf0fb0bf0, 0xad41ecad,0xd4b367d4,0xa25ffda2,0xaf45eaaf,0x9c23bf9c,0xa453f7a4,0x72e49672,0xc09b5bc0, 0xb775c2b7,0xfde11cfd,0x933dae93,0x264c6a26,0x366c5a36,0x3f7e413f,0xf7f502f7,0xcc834fcc, 0x34685c34,0xa551f4a5,0xe5d134e5,0xf1f908f1,0x71e29371,0xd8ab73d8,0x31625331,0x152a3f15, 0x04080c04,0xc79552c7,0x23466523,0xc39d5ec3,0x18302818,0x9637a196,0x050a0f05,0x9a2fb59a, 0x070e0907,0x12243612,0x801b9b80,0xe2df3de2,0xebcd26eb,0x274e6927,0xb27fcdb2,0x75ea9f75, 0x09121b09,0x831d9e83,0x2c58742c,0x1a342e1a,0x1b362d1b,0x6edcb26e,0x5ab4ee5a,0xa05bfba0, 0x52a4f652,0x3b764d3b,0xd6b761d6,0xb37dceb3,0x29527b29,0xe3dd3ee3,0x2f5e712f,0x84139784, 0x53a6f553,0xd1b968d1,0x00000000,0xedc12ced,0x20406020,0xfce31ffc,0xb179c8b1,0x5bb6ed5b, 0x6ad4be6a,0xcb8d46cb,0xbe67d9be,0x39724b39,0x4a94de4a,0x4c98d44c,0x58b0e858,0xcf854acf, 0xd0bb6bd0,0xefc52aef,0xaa4fe5aa,0xfbed16fb,0x4386c543,0x4d9ad74d,0x33665533,0x85119485, 0x458acf45,0xf9e910f9,0x02040602,0x7ffe817f,0x50a0f050,0x3c78443c,0x9f25ba9f,0xa84be3a8, 0x51a2f351,0xa35dfea3,0x4080c040,0x8f058a8f,0x923fad92,0x9d21bc9d,0x38704838,0xf5f104f5, 0xbc63dfbc,0xb677c1b6,0xdaaf75da,0x21426321,0x10203010,0xffe51aff,0xf3fd0ef3,0xd2bf6dd2, 0xcd814ccd,0x0c18140c,0x13263513,0xecc32fec,0x5fbee15f,0x9735a297,0x4488cc44,0x172e3917, 0xc49357c4,0xa755f2a7,0x7efc827e,0x3d7a473d,0x64c8ac64,0x5dbae75d,0x19322b19,0x73e69573, 0x60c0a060,0x81199881,0x4f9ed14f,0xdca37fdc,0x22446622,0x2a547e2a,0x903bab90,0x880b8388, 0x468cca46,0xeec729ee,0xb86bd3b8,0x14283c14,0xdea779de,0x5ebce25e,0x0b161d0b,0xdbad76db, 0xe0db3be0,0x32645632,0x3a744e3a,0x0a141e0a,0x4992db49,0x060c0a06,0x24486c24,0x5cb8e45c, 0xc29f5dc2,0xd3bd6ed3,0xac43efac,0x62c4a662,0x9139a891,0x9531a495,0xe4d337e4,0x79f28b79, 0xe7d532e7,0xc88b43c8,0x376e5937,0x6ddab76d,0x8d018c8d,0xd5b164d5,0x4e9cd24e,0xa949e0a9, 0x6cd8b46c,0x56acfa56,0xf4f307f4,0xeacf25ea,0x65caaf65,0x7af48e7a,0xae47e9ae,0x08101808, 0xba6fd5ba,0x78f08878,0x254a6f25,0x2e5c722e,0x1c38241c,0xa657f1a6,0xb473c7b4,0xc69751c6, 0xe8cb23e8,0xdda17cdd,0x74e89c74,0x1f3e211f,0x4b96dd4b,0xbd61dcbd,0x8b0d868b,0x8a0f858a, 0x70e09070,0x3e7c423e,0xb571c4b5,0x66ccaa66,0x4890d848,0x03060503,0xf6f701f6,0x0e1c120e, 0x61c2a361,0x356a5f35,0x57aef957,0xb969d0b9,0x86179186,0xc19958c1,0x1d3a271d,0x9e27b99e, 0xe1d938e1,0xf8eb13f8,0x982bb398,0x11223311,0x69d2bb69,0xd9a970d9,0x8e07898e,0x9433a794, 0x9b2db69b,0x1e3c221e,0x87159287,0xe9c920e9,0xce8749ce,0x55aaff55,0x28507828,0xdfa57adf, 0x8c038f8c,0xa159f8a1,0x89098089,0x0d1a170d,0xbf65dabf,0xe6d731e6,0x4284c642,0x68d0b868, 0x4182c341,0x9929b099,0x2d5a772d,0x0f1e110f,0xb07bcbb0,0x54a8fc54,0xbb6dd6bb,0x162c3a16 }; static const bw sm3[256]= { 0xc6a56363,0xf8847c7c,0xee997777,0xf68d7b7b,0xff0df2f2,0xd6bd6b6b,0xdeb16f6f,0x9154c5c5, 0x60503030,0x02030101,0xcea96767,0x567d2b2b,0xe719fefe,0xb562d7d7,0x4de6abab,0xec9a7676, 0x8f45caca,0x1f9d8282,0x8940c9c9,0xfa877d7d,0xef15fafa,0xb2eb5959,0x8ec94747,0xfb0bf0f0, 0x41ecadad,0xb367d4d4,0x5ffda2a2,0x45eaafaf,0x23bf9c9c,0x53f7a4a4,0xe4967272,0x9b5bc0c0, 0x75c2b7b7,0xe11cfdfd,0x3dae9393,0x4c6a2626,0x6c5a3636,0x7e413f3f,0xf502f7f7,0x834fcccc, 0x685c3434,0x51f4a5a5,0xd134e5e5,0xf908f1f1,0xe2937171,0xab73d8d8,0x62533131,0x2a3f1515, 0x080c0404,0x9552c7c7,0x46652323,0x9d5ec3c3,0x30281818,0x37a19696,0x0a0f0505,0x2fb59a9a, 0x0e090707,0x24361212,0x1b9b8080,0xdf3de2e2,0xcd26ebeb,0x4e692727,0x7fcdb2b2,0xea9f7575, 0x121b0909,0x1d9e8383,0x58742c2c,0x342e1a1a,0x362d1b1b,0xdcb26e6e,0xb4ee5a5a,0x5bfba0a0, 0xa4f65252,0x764d3b3b,0xb761d6d6,0x7dceb3b3,0x527b2929,0xdd3ee3e3,0x5e712f2f,0x13978484, 0xa6f55353,0xb968d1d1,0x00000000,0xc12ceded,0x40602020,0xe31ffcfc,0x79c8b1b1,0xb6ed5b5b, 0xd4be6a6a,0x8d46cbcb,0x67d9bebe,0x724b3939,0x94de4a4a,0x98d44c4c,0xb0e85858,0x854acfcf, 0xbb6bd0d0,0xc52aefef,0x4fe5aaaa,0xed16fbfb,0x86c54343,0x9ad74d4d,0x66553333,0x11948585, 0x8acf4545,0xe910f9f9,0x04060202,0xfe817f7f,0xa0f05050,0x78443c3c,0x25ba9f9f,0x4be3a8a8, 0xa2f35151,0x5dfea3a3,0x80c04040,0x058a8f8f,0x3fad9292,0x21bc9d9d,0x70483838,0xf104f5f5, 0x63dfbcbc,0x77c1b6b6,0xaf75dada,0x42632121,0x20301010,0xe51affff,0xfd0ef3f3,0xbf6dd2d2, 0x814ccdcd,0x18140c0c,0x26351313,0xc32fecec,0xbee15f5f,0x35a29797,0x88cc4444,0x2e391717, 0x9357c4c4,0x55f2a7a7,0xfc827e7e,0x7a473d3d,0xc8ac6464,0xbae75d5d,0x322b1919,0xe6957373, 0xc0a06060,0x19988181,0x9ed14f4f,0xa37fdcdc,0x44662222,0x547e2a2a,0x3bab9090,0x0b838888, 0x8cca4646,0xc729eeee,0x6bd3b8b8,0x283c1414,0xa779dede,0xbce25e5e,0x161d0b0b,0xad76dbdb, 0xdb3be0e0,0x64563232,0x744e3a3a,0x141e0a0a,0x92db4949,0x0c0a0606,0x486c2424,0xb8e45c5c, 0x9f5dc2c2,0xbd6ed3d3,0x43efacac,0xc4a66262,0x39a89191,0x31a49595,0xd337e4e4,0xf28b7979, 0xd532e7e7,0x8b43c8c8,0x6e593737,0xdab76d6d,0x018c8d8d,0xb164d5d5,0x9cd24e4e,0x49e0a9a9, 0xd8b46c6c,0xacfa5656,0xf307f4f4,0xcf25eaea,0xcaaf6565,0xf48e7a7a,0x47e9aeae,0x10180808, 0x6fd5baba,0xf0887878,0x4a6f2525,0x5c722e2e,0x38241c1c,0x57f1a6a6,0x73c7b4b4,0x9751c6c6, 0xcb23e8e8,0xa17cdddd,0xe89c7474,0x3e211f1f,0x96dd4b4b,0x61dcbdbd,0x0d868b8b,0x0f858a8a, 0xe0907070,0x7c423e3e,0x71c4b5b5,0xccaa6666,0x90d84848,0x06050303,0xf701f6f6,0x1c120e0e, 0xc2a36161,0x6a5f3535,0xaef95757,0x69d0b9b9,0x17918686,0x9958c1c1,0x3a271d1d,0x27b99e9e, 0xd938e1e1,0xeb13f8f8,0x2bb39898,0x22331111,0xd2bb6969,0xa970d9d9,0x07898e8e,0x33a79494, 0x2db69b9b,0x3c221e1e,0x15928787,0xc920e9e9,0x8749cece,0xaaff5555,0x50782828,0xa57adfdf, 0x038f8c8c,0x59f8a1a1,0x09808989,0x1a170d0d,0x65dabfbf,0xd731e6e6,0x84c64242,0xd0b86868, 0x82c34141,0x29b09999,0x5a772d2d,0x1e110f0f,0x7bcbb0b0,0xa8fc5454,0x6dd6bbbb,0x2c3a1616 }; void key_expansion(const bw4 * key,word_t * w); int Aes128_Enc(bw4 * input,int inlen,const bw4 * key,int keylen,bw4 * output); int Aes128cbc_Enc(bw4 * state,int inlen,const word_t * wkey,const bw4 * iv); int Aes128cbc_Pkcs7_Enc(bw4 * input,int inlen,const word_t * wkey,bw4 * output,const bw4 * iv); #endif
aes128enc.c
#include"aes128enc.h" /*add round key,wo,wk:(word_t *),i:(int)*/ #define add_round_key(wo,wk,i) for((i)=0;(i)<4;(i)++){ (wo)[i]^=(wk)[i]; } /*shift row left,op:(byte_t*),k:(int)*/ #define shift_rows_left(op,k) { k=(op)[1]; (op)[1]=(op)[5]; (op)[5]=(op)[9]; (op)[9]=(op)[13]; (op)[13]=k; k=(op)[2]; (op)[2]=(op)[10]; (op)[10]=k; k=(op)[6]; (op)[6]=(op)[14]; (op)[14]=k; k=(op)[15]; (op)[15]=(op)[11]; (op)[11]=(op)[7]; (op)[7]=(op)[3]; (op)[3]=k; } #define sbox_shift_rows_left(op,k) { (op)[0]=sbox[(op)[0]]; (op)[4]=sbox[(op)[4]]; (op)[8]=sbox[(op)[8]]; (op)[12]=sbox[(op)[12]]; k=sbox[(op)[1]]; (op)[1]=sbox[(op)[5]]; (op)[5]=sbox[(op)[9]]; (op)[9]=sbox[(op)[13]]; (op)[13]=k; k=sbox[(op)[2]]; (op)[2]=sbox[(op)[10]]; (op)[10]=k; k=sbox[(op)[6]]; (op)[6]=sbox[(op)[14]]; (op)[14]=k; k=sbox[(op)[15]]; (op)[15]=sbox[(op)[11]]; (op)[11]=sbox[(op)[7]]; (op)[7]=sbox[(op)[3]]; (op)[3]=k; } #define subword(wt,sbox) { (wt).b[0]=(sbox)[(wt).b[0]]; (wt).b[1]=(sbox)[(wt).b[1]]; (wt).b[2]=(sbox)[(wt).b[2]]; (wt).b[3]=(sbox)[(wt).b[3]]; } static void PKCS7_Pad(byte_t * buf,int buflen,int blocksize,byte_t * paddingBuf) { int i; int p=blocksize-buflen%blocksize; for(i=0;i<buflen;i++) paddingBuf[i]=buf[i]; for(i=buflen;i<blocksize;i++) paddingBuf[i]=p; } void key_expansion(const bw4 * key,word_t * w) { bw temp; int i,j; for(i=0;i<4;i++) { w[i]=key->w[i]; } for(i=4;i<44;i++) { temp.w=w[i-1]; if(i%4==0) { temp.w=ROTATE_RIGHT(temp.w,32,8);//this for little Endian (bigEndian:rotate right 24bit) subword(temp,sbox); temp.w^=RC[i/4-1]; } w[i]=w[i-4]^temp.w; } } /*AES128 encryption*/ int Aes128_Enc(bw4 * input,int inlen,const bw4 * key,int keylen,bw4 * output) { if(!input || inlen!=16 || !key || keylen!=16 || !output) return -1; int i=0,j,round=0; byte_t k; bw tr; for(i=0;i<4;i++) output->w[i]=input->w[i]; key_expansion(key,W); //Add Round Key add_round_key(output->w,W+round*4,i); round++; while(round<10){ //ShiftRows shift_rows_left(output->b,k); //subbytes & mixcolumns for(i=0;i<4;i++) { output->w[i]=sm0[output->b[i*4]].w ^ sm1[output->b[i*4+1]].w ^ sm2[output->b[i*4+2]].w ^ sm3[output->b[i*4+3]].w ^ (W+round*4)[i]; } round++; } //subBytes & ShiftRows sbox_shift_rows_left(output->b,k); //AddRoundKey add_round_key(output->w,W+round*4,i); return 0; } int Aes128cbc_Enc(bw4 * state,int slen,const word_t * wkey,const bw4 * iv) { if(!state || slen!=16 || !wkey ) return -1; int i=0,j,round=0; byte_t k; bw tr; for(i=0;i<4;i++) state->w[i]^=iv->w[i]; //Add Round Key add_round_key(state->w,wkey+round*4,i); round++; while(round<10){ //shift rows shift_rows_left(state->b,k); //subbytes & mixcolumns for(i=0;i<4;i++) { state->w[i]= sm0[state->b[i*4]].w ^ sm1[state->b[i*4+1]].w ^ sm2[state->b[i*4+2]].w ^ sm3[state->b[i*4+3]].w ^ (wkey+round*4)[i]; } round++; } //subBytes & ShiftRows sbox_shift_rows_left(state->b,k); //AddRoundKey add_round_key(state->w,wkey+round*4,i); return 0; } int Aes128cbc_Pkcs7_Enc(bw4 * input,int inlen,const word_t * wkey,bw4 * output,const bw4 * iv) { int i=0,j,round = 0; byte_t k; bw tr; if(inlen<16){ PKCS7_Pad(input->b,inlen,16,output->b); for(i=0;i<4;i++) output->w[i]^=iv->w[i]; }else{ for(i=0;i<4;i++) output->w[i]=input->w[i]^iv->w[i]; } //Add Round Key add_round_key(output->w,wkey+round*4,i); round++; while(round<10){ //ShiftRows shift_rows_left(output->b,k); for(i=0;i<4;i++) { output->w[i]=sm0[output->b[i*4]].w ^ sm1[output->b[i*4+1]].w ^ sm2[output->b[i*4+2]].w ^ sm3[output->b[i*4+3]].w ^ (wkey+round*4)[i]; } round++; } //subbytes & ShiftRows sbox_shift_rows_left(output->b,k); //AddRoundKey add_round_key(output->w,wkey+round*4,i); return 0; }
这个是优化过的代码，四字节对齐以及提前计算一些数据，没有处理字节序的问题，这里针对的是intel cpu来写的。