From 273444366a27ea82bf282eaac8e33c8a956380ff Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Niels=20M=C3=B6ller?= Date: Sat, 14 Apr 2012 09:51:20 +0200 Subject: Reorganized aes_invert_key with new tables. --- aes-set-decrypt-key.c | 185 +++++++++++++++++++++++--------------------------- 1 file changed, 85 insertions(+), 100 deletions(-) (limited to 'aes-set-decrypt-key.c') diff --git a/aes-set-decrypt-key.c b/aes-set-decrypt-key.c index 28b2cdcf..11302d98 100644 --- a/aes-set-decrypt-key.c +++ b/aes-set-decrypt-key.c @@ -31,108 +31,93 @@ #include "aes-internal.h" -/* Tables for computations in the AES GF2 field. */ -static const uint8_t gf2_log[0x100] = -{ - 0x00,0x00,0x19,0x01,0x32,0x02,0x1a,0xc6, - 0x4b,0xc7,0x1b,0x68,0x33,0xee,0xdf,0x03, - 0x64,0x04,0xe0,0x0e,0x34,0x8d,0x81,0xef, - 0x4c,0x71,0x08,0xc8,0xf8,0x69,0x1c,0xc1, - 0x7d,0xc2,0x1d,0xb5,0xf9,0xb9,0x27,0x6a, - 0x4d,0xe4,0xa6,0x72,0x9a,0xc9,0x09,0x78, - 0x65,0x2f,0x8a,0x05,0x21,0x0f,0xe1,0x24, - 0x12,0xf0,0x82,0x45,0x35,0x93,0xda,0x8e, - 0x96,0x8f,0xdb,0xbd,0x36,0xd0,0xce,0x94, - 0x13,0x5c,0xd2,0xf1,0x40,0x46,0x83,0x38, - 0x66,0xdd,0xfd,0x30,0xbf,0x06,0x8b,0x62, - 0xb3,0x25,0xe2,0x98,0x22,0x88,0x91,0x10, - 0x7e,0x6e,0x48,0xc3,0xa3,0xb6,0x1e,0x42, - 0x3a,0x6b,0x28,0x54,0xfa,0x85,0x3d,0xba, - 0x2b,0x79,0x0a,0x15,0x9b,0x9f,0x5e,0xca, - 0x4e,0xd4,0xac,0xe5,0xf3,0x73,0xa7,0x57, - 0xaf,0x58,0xa8,0x50,0xf4,0xea,0xd6,0x74, - 0x4f,0xae,0xe9,0xd5,0xe7,0xe6,0xad,0xe8, - 0x2c,0xd7,0x75,0x7a,0xeb,0x16,0x0b,0xf5, - 0x59,0xcb,0x5f,0xb0,0x9c,0xa9,0x51,0xa0, - 0x7f,0x0c,0xf6,0x6f,0x17,0xc4,0x49,0xec, - 0xd8,0x43,0x1f,0x2d,0xa4,0x76,0x7b,0xb7, - 0xcc,0xbb,0x3e,0x5a,0xfb,0x60,0xb1,0x86, - 0x3b,0x52,0xa1,0x6c,0xaa,0x55,0x29,0x9d, - 0x97,0xb2,0x87,0x90,0x61,0xbe,0xdc,0xfc, - 0xbc,0x95,0xcf,0xcd,0x37,0x3f,0x5b,0xd1, - 0x53,0x39,0x84,0x3c,0x41,0xa2,0x6d,0x47, - 0x14,0x2a,0x9e,0x5d,0x56,0xf2,0xd3,0xab, - 0x44,0x11,0x92,0xd9,0x23,0x20,0x2e,0x89, - 0xb4,0x7c,0xb8,0x26,0x77,0x99,0xe3,0xa5, - 0x67,0x4a,0xed,0xde,0xc5,0x31,0xfe,0x18, - 0x0d,0x63,0x8c,0x80,0xc0,0xf7,0x70,0x07, -}; +#include "macros.h" -static const uint8_t gf2_exp[0x100] = +/* NOTE: We don't include rotated versions of the table. */ +static const uint32_t mtable[0x100] = { - 0x01,0x03,0x05,0x0f,0x11,0x33,0x55,0xff, - 0x1a,0x2e,0x72,0x96,0xa1,0xf8,0x13,0x35, - 0x5f,0xe1,0x38,0x48,0xd8,0x73,0x95,0xa4, - 0xf7,0x02,0x06,0x0a,0x1e,0x22,0x66,0xaa, - 0xe5,0x34,0x5c,0xe4,0x37,0x59,0xeb,0x26, - 0x6a,0xbe,0xd9,0x70,0x90,0xab,0xe6,0x31, - 0x53,0xf5,0x04,0x0c,0x14,0x3c,0x44,0xcc, - 0x4f,0xd1,0x68,0xb8,0xd3,0x6e,0xb2,0xcd, - 0x4c,0xd4,0x67,0xa9,0xe0,0x3b,0x4d,0xd7, - 0x62,0xa6,0xf1,0x08,0x18,0x28,0x78,0x88, - 0x83,0x9e,0xb9,0xd0,0x6b,0xbd,0xdc,0x7f, - 0x81,0x98,0xb3,0xce,0x49,0xdb,0x76,0x9a, - 0xb5,0xc4,0x57,0xf9,0x10,0x30,0x50,0xf0, - 0x0b,0x1d,0x27,0x69,0xbb,0xd6,0x61,0xa3, - 0xfe,0x19,0x2b,0x7d,0x87,0x92,0xad,0xec, - 0x2f,0x71,0x93,0xae,0xe9,0x20,0x60,0xa0, - 0xfb,0x16,0x3a,0x4e,0xd2,0x6d,0xb7,0xc2, - 0x5d,0xe7,0x32,0x56,0xfa,0x15,0x3f,0x41, - 0xc3,0x5e,0xe2,0x3d,0x47,0xc9,0x40,0xc0, - 0x5b,0xed,0x2c,0x74,0x9c,0xbf,0xda,0x75, - 0x9f,0xba,0xd5,0x64,0xac,0xef,0x2a,0x7e, - 0x82,0x9d,0xbc,0xdf,0x7a,0x8e,0x89,0x80, - 0x9b,0xb6,0xc1,0x58,0xe8,0x23,0x65,0xaf, - 0xea,0x25,0x6f,0xb1,0xc8,0x43,0xc5,0x54, - 0xfc,0x1f,0x21,0x63,0xa5,0xf4,0x07,0x09, - 0x1b,0x2d,0x77,0x99,0xb0,0xcb,0x46,0xca, - 0x45,0xcf,0x4a,0xde,0x79,0x8b,0x86,0x91, - 0xa8,0xe3,0x3e,0x42,0xc6,0x51,0xf3,0x0e, - 0x12,0x36,0x5a,0xee,0x29,0x7b,0x8d,0x8c, - 0x8f,0x8a,0x85,0x94,0xa7,0xf2,0x0d,0x17, - 0x39,0x4b,0xdd,0x7c,0x84,0x97,0xa2,0xfd, - 0x1c,0x24,0x6c,0xb4,0xc7,0x52,0xf6,0x01, + 0x00000000,0x0b0d090e,0x161a121c,0x1d171b12, + 0x2c342438,0x27392d36,0x3a2e3624,0x31233f2a, + 0x58684870,0x5365417e,0x4e725a6c,0x457f5362, + 0x745c6c48,0x7f516546,0x62467e54,0x694b775a, + 0xb0d090e0,0xbbdd99ee,0xa6ca82fc,0xadc78bf2, + 0x9ce4b4d8,0x97e9bdd6,0x8afea6c4,0x81f3afca, + 0xe8b8d890,0xe3b5d19e,0xfea2ca8c,0xf5afc382, + 0xc48cfca8,0xcf81f5a6,0xd296eeb4,0xd99be7ba, + 0x7bbb3bdb,0x70b632d5,0x6da129c7,0x66ac20c9, + 0x578f1fe3,0x5c8216ed,0x41950dff,0x4a9804f1, + 0x23d373ab,0x28de7aa5,0x35c961b7,0x3ec468b9, + 0x0fe75793,0x04ea5e9d,0x19fd458f,0x12f04c81, + 0xcb6bab3b,0xc066a235,0xdd71b927,0xd67cb029, + 0xe75f8f03,0xec52860d,0xf1459d1f,0xfa489411, + 0x9303e34b,0x980eea45,0x8519f157,0x8e14f859, + 0xbf37c773,0xb43ace7d,0xa92dd56f,0xa220dc61, + 0xf66d76ad,0xfd607fa3,0xe07764b1,0xeb7a6dbf, + 0xda595295,0xd1545b9b,0xcc434089,0xc74e4987, + 0xae053edd,0xa50837d3,0xb81f2cc1,0xb31225cf, + 0x82311ae5,0x893c13eb,0x942b08f9,0x9f2601f7, + 0x46bde64d,0x4db0ef43,0x50a7f451,0x5baafd5f, + 0x6a89c275,0x6184cb7b,0x7c93d069,0x779ed967, + 0x1ed5ae3d,0x15d8a733,0x08cfbc21,0x03c2b52f, + 0x32e18a05,0x39ec830b,0x24fb9819,0x2ff69117, + 0x8dd64d76,0x86db4478,0x9bcc5f6a,0x90c15664, + 0xa1e2694e,0xaaef6040,0xb7f87b52,0xbcf5725c, + 0xd5be0506,0xdeb30c08,0xc3a4171a,0xc8a91e14, + 0xf98a213e,0xf2872830,0xef903322,0xe49d3a2c, + 0x3d06dd96,0x360bd498,0x2b1ccf8a,0x2011c684, + 0x1132f9ae,0x1a3ff0a0,0x0728ebb2,0x0c25e2bc, + 0x656e95e6,0x6e639ce8,0x737487fa,0x78798ef4, + 0x495ab1de,0x4257b8d0,0x5f40a3c2,0x544daacc, + 0xf7daec41,0xfcd7e54f,0xe1c0fe5d,0xeacdf753, + 0xdbeec879,0xd0e3c177,0xcdf4da65,0xc6f9d36b, + 0xafb2a431,0xa4bfad3f,0xb9a8b62d,0xb2a5bf23, + 0x83868009,0x888b8907,0x959c9215,0x9e919b1b, + 0x470a7ca1,0x4c0775af,0x51106ebd,0x5a1d67b3, + 0x6b3e5899,0x60335197,0x7d244a85,0x7629438b, + 0x1f6234d1,0x146f3ddf,0x097826cd,0x02752fc3, + 0x335610e9,0x385b19e7,0x254c02f5,0x2e410bfb, + 0x8c61d79a,0x876cde94,0x9a7bc586,0x9176cc88, + 0xa055f3a2,0xab58faac,0xb64fe1be,0xbd42e8b0, + 0xd4099fea,0xdf0496e4,0xc2138df6,0xc91e84f8, + 0xf83dbbd2,0xf330b2dc,0xee27a9ce,0xe52aa0c0, + 0x3cb1477a,0x37bc4e74,0x2aab5566,0x21a65c68, + 0x10856342,0x1b886a4c,0x069f715e,0x0d927850, + 0x64d90f0a,0x6fd40604,0x72c31d16,0x79ce1418, + 0x48ed2b32,0x43e0223c,0x5ef7392e,0x55fa3020, + 0x01b79aec,0x0aba93e2,0x17ad88f0,0x1ca081fe, + 0x2d83bed4,0x268eb7da,0x3b99acc8,0x3094a5c6, + 0x59dfd29c,0x52d2db92,0x4fc5c080,0x44c8c98e, + 0x75ebf6a4,0x7ee6ffaa,0x63f1e4b8,0x68fcedb6, + 0xb1670a0c,0xba6a0302,0xa77d1810,0xac70111e, + 0x9d532e34,0x965e273a,0x8b493c28,0x80443526, + 0xe90f427c,0xe2024b72,0xff155060,0xf418596e, + 0xc53b6644,0xce366f4a,0xd3217458,0xd82c7d56, + 0x7a0ca137,0x7101a839,0x6c16b32b,0x671bba25, + 0x5638850f,0x5d358c01,0x40229713,0x4b2f9e1d, + 0x2264e947,0x2969e049,0x347efb5b,0x3f73f255, + 0x0e50cd7f,0x055dc471,0x184adf63,0x1347d66d, + 0xcadc31d7,0xc1d138d9,0xdcc623cb,0xd7cb2ac5, + 0xe6e815ef,0xede51ce1,0xf0f207f3,0xfbff0efd, + 0x92b479a7,0x99b970a9,0x84ae6bbb,0x8fa362b5, + 0xbe805d9f,0xb58d5491,0xa89a4f83,0xa397468d, }; -static unsigned -mult(unsigned a, unsigned b) -{ - return (a && b) ? gf2_exp[ (gf2_log[a] + gf2_log[b]) % 255] : 0; -} - -static void -inv_mix_column(uint32_t *a) -{ - uint8_t c[4][4]; - unsigned i, j; - - for (j = 0; j < 4; j++) - { - for(i = 0; i < 4; i++) - { - c[j][i] = mult(0xe, (a[j] >> i*8) & 0xff) - ^ mult(0xb, (a[j] >> ((i+1)%4)*8) & 0xff) - ^ mult(0xd, (a[j] >> ((i+2)%4)*8) & 0xff) - ^ mult(0x9, (a[j] >> ((i+3)%4)*8) & 0xff); - } - } - for (i = 0; i < 4; i++) - { - a[i] = 0; - for(j = 0; j < 4; j++) - a[i] |= c[i][j] << (j*8); - } -} +#define MIX_COLUMN(T, key) do { \ + uint32_t _k, _nk, _t; \ + _k = (key); \ + _nk = T[_k & 0xff]; \ + _k >>= 8; \ + _t = T[_k & 0xff]; \ + _nk ^= ROTL32(8, _t); \ + _k >>= 8; \ + _t = T[_k & 0xff]; \ + _nk ^= ROTL32(16, _t); \ + _k >>= 8; \ + _t = T[_k & 0xff]; \ + _nk ^= ROTL32(24, _t); \ + (key) = _nk; \ + } while(0) + #define SWAP(a, b) \ do { uint32_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0) @@ -170,8 +155,8 @@ aes_invert_key(struct aes_ctx *dst, } /* Transform all subkeys but the first and last. */ - for (i = 4; i < 4 * nrounds; i += 4) - inv_mix_column(dst->keys + i); + for (i = 4; i < 4 * nrounds; i++) + MIX_COLUMN (mtable, dst->keys[i]); } void -- cgit v1.2.1