From b27be3a688b814832b965b15680f9ccd053a0753 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Niels=20M=C3=B6ller?= Date: Wed, 22 May 2013 20:14:14 +0200 Subject: New internal functions _aes_set_key and _aes_invert. --- aes-invert-internal.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 aes-invert-internal.c (limited to 'aes-invert-internal.c') diff --git a/aes-invert-internal.c b/aes-invert-internal.c new file mode 100644 index 00000000..0ee4a38e --- /dev/null +++ b/aes-invert-internal.c @@ -0,0 +1,156 @@ +/* aes-invert-internal.c + * + * Inverse key setup for the aes/rijndael block cipher. + */ + +/* nettle, low-level cryptographics library + * + * Copyright (C) 2000, 2001, 2002, Rafael R. Sevilla, Niels Möller + * Copyright (C) 2013 Niels Möller + * + * The nettle library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or (at your + * option) any later version. + * + * The nettle library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + * License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with the nettle library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02111-1301, USA. + */ + +/* Originally written by Rafael R. Sevilla */ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include "aes-internal.h" + +#include "macros.h" + +/* NOTE: We don't include rotated versions of the table. */ +static const uint32_t mtable[0x100] = +{ + 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, +}; + +#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) + +void +_aes_invert(unsigned rounds, uint32_t *dst, const uint32_t *src) +{ + unsigned i; + + /* Reverse the order of subkeys, in groups of 4. */ + /* FIXME: Instead of reordering the subkeys, change the access order + of aes_decrypt, since it's a separate function anyway? */ + if (src == dst) + { + unsigned j, k; + + for (i = 0, j = rounds * 4; + i < j; + i += 4, j -= 4) + for (k = 0; k<4; k++) + SWAP(dst[i+k], dst[j+k]); + } + else + { + unsigned k; + + for (i = 0; i <= rounds * 4; i += 4) + for (k = 0; k < 4; k++) + dst[i+k] = src[rounds * 4 - i + k]; + } + + /* Transform all subkeys but the first and last. */ + for (i = 4; i < 4 * rounds; i++) + MIX_COLUMN (mtable, dst[i]); +} -- cgit v1.2.1