openssl/crypto/camellia/camellia.c

/*
 * Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/* ====================================================================
 * Copyright 2006 NTT (Nippon Telegraph and Telephone Corporation) .
 * ALL RIGHTS RESERVED.
 *
 * Intellectual Property information for Camellia:
 *     http://info.isl.ntt.co.jp/crypt/eng/info/chiteki.html
 *
 * News Release for Announcement of Camellia open source:
 *     http://www.ntt.co.jp/news/news06e/0604/060413a.html
 *
 * The Camellia Code included herein is developed by
 * NTT (Nippon Telegraph and Telephone Corporation), and is contributed
 * to the OpenSSL project.
 */

/*
 * Algorithm Specification
 * http://info.isl.ntt.co.jp/crypt/eng/camellia/specifications.html
 */

/*
 * This release balances code size and performance. In particular key
 * schedule setup is fully unrolled, because doing so *significantly*
 * reduces amount of instructions per setup round and code increase is
 * justifiable. In block functions on the other hand only inner loops
 * are unrolled, as full unroll gives only nominal performance boost,
 * while code size grows 4 or 7 times. Also, unlike previous versions
 * this one "encourages" compiler to keep intermediate variables in
 * registers, which should give better "all round" results, in other
 * words reasonable performance even with not so modern compilers.
 */

/*
 * Camellia low level APIs are deprecated for public use, but still ok for
 * internal use.
 */
#include "internal/deprecated.h"

#include <openssl/camellia.h>
#include "cmll_local.h"
#include <string.h>
#include <stdlib.h>

#define RightRotate(x, s) ( ((x) >> (s)) + ((x) << (32 - s)) )
#define LeftRotate(x, s)  ( ((x) << (s)) + ((x) >> (32 - s)) )

#define GETU32(p)   (((u32)(p)[0] << 24) ^ ((u32)(p)[1] << 16) ^ ((u32)(p)[2] <<  8) ^ ((u32)(p)[3]))
#define PUTU32(p,v) ((p)[0] = (u8)((v) >> 24), (p)[1] = (u8)((v) >> 16), (p)[2] = (u8)((v) >>  8), (p)[3] = (u8)(v))

/* S-box data */
#define SBOX1_1110 Camellia_SBOX[0]
#define SBOX4_4404 Camellia_SBOX[1]
#define SBOX2_0222 Camellia_SBOX[2]
#define SBOX3_3033 Camellia_SBOX[3]
static const u32 Camellia_SBOX[][256] = {
    {0x70707000, 0x82828200, 0x2c2c2c00, 0xececec00, 0xb3b3b300, 0x27272700,
     0xc0c0c000, 0xe5e5e500, 0xe4e4e400, 0x85858500, 0x57575700, 0x35353500,
     0xeaeaea00, 0x0c0c0c00, 0xaeaeae00, 0x41414100, 0x23232300, 0xefefef00,
     0x6b6b6b00, 0x93939300, 0x45454500, 0x19191900, 0xa5a5a500, 0x21212100,
     0xededed00, 0x0e0e0e00, 0x4f4f4f00, 0x4e4e4e00, 0x1d1d1d00, 0x65656500,
     0x92929200, 0xbdbdbd00, 0x86868600, 0xb8b8b800, 0xafafaf00, 0x8f8f8f00,
     0x7c7c7c00, 0xebebeb00, 0x1f1f1f00, 0xcecece00, 0x3e3e3e00, 0x30303000,
     0xdcdcdc00, 0x5f5f5f00, 0x5e5e5e00, 0xc5c5c500, 0x0b0b0b00, 0x1a1a1a00,
     0xa6a6a600, 0xe1e1e100, 0x39393900, 0xcacaca00, 0xd5d5d500, 0x47474700,
     0x5d5d5d00, 0x3d3d3d00, 0xd9d9d900, 0x01010100, 0x5a5a5a00, 0xd6d6d600,
     0x51515100, 0x56565600, 0x6c6c6c00, 0x4d4d4d00, 0x8b8b8b00, 0x0d0d0d00,
     0x9a9a9a00, 0x66666600, 0xfbfbfb00, 0xcccccc00, 0xb0b0b000, 0x2d2d2d00,
     0x74747400, 0x12121200, 0x2b2b2b00, 0x20202000, 0xf0f0f000, 0xb1b1b100,
     0x84848400, 0x99999900, 0xdfdfdf00, 0x4c4c4c00, 0xcbcbcb00, 0xc2c2c200,
     0x34343400, 0x7e7e7e00, 0x76767600, 0x05050500, 0x6d6d6d00, 0xb7b7b700,
     0xa9a9a900, 0x31313100, 0xd1d1d100, 0x17171700, 0x04040400, 0xd7d7d700,
     0x14141400, 0x58585800, 0x3a3a3a00, 0x61616100, 0xdedede00, 0x1b1b1b00,
     0x11111100, 0x1c1c1c00, 0x32323200, 0x0f0f0f00, 0x9c9c9c00, 0x16161600,
     0x53535300, 0x18181800, 0xf2f2f200, 0x22222200, 0xfefefe00, 0x44444400,
     0xcfcfcf00, 0xb2b2b200, 0xc3c3c300, 0xb5b5b500, 0x7a7a7a00, 0x91919100,
     0x24242400, 0x08080800, 0xe8e8e800, 0xa8a8a800, 0x60606000, 0xfcfcfc00,
     0x69696900, 0x50505000, 0xaaaaaa00, 0xd0d0d000, 0xa0a0a000, 0x7d7d7d00,
     0xa1a1a100, 0x89898900, 0x62626200, 0x97979700, 0x54545400, 0x5b5b5b00,
     0x1e1e1e00, 0x95959500, 0xe0e0e000, 0xffffff00, 0x64646400, 0xd2d2d200,
     0x10101000, 0xc4c4c400, 0x00000000, 0x48484800, 0xa3a3a300, 0xf7f7f700,
     0x75757500, 0xdbdbdb00, 0x8a8a8a00, 0x03030300, 0xe6e6e600, 0xdadada00,
     0x09090900, 0x3f3f3f00, 0xdddddd00, 0x94949400, 0x87878700, 0x5c5c5c00,
     0x83838300, 0x02020200, 0xcdcdcd00, 0x4a4a4a00, 0x90909000, 0x33333300,
     0x73737300, 0x67676700, 0xf6f6f600, 0xf3f3f300, 0x9d9d9d00, 0x7f7f7f00,
     0xbfbfbf00, 0xe2e2e200, 0x52525200, 0x9b9b9b00, 0xd8d8d800, 0x26262600,
     0xc8c8c800, 0x37373700, 0xc6c6c600, 0x3b3b3b00, 0x81818100, 0x96969600,
     0x6f6f6f00, 0x4b4b4b00, 0x13131300, 0xbebebe00, 0x63636300, 0x2e2e2e00,
     0xe9e9e900, 0x79797900, 0xa7a7a700, 0x8c8c8c00, 0x9f9f9f00, 0x6e6e6e00,
     0xbcbcbc00, 0x8e8e8e00, 0x29292900, 0xf5f5f500, 0xf9f9f900, 0xb6b6b600,
     0x2f2f2f00, 0xfdfdfd00, 0xb4b4b400, 0x59595900, 0x78787800, 0x98989800,
     0x06060600, 0x6a6a6a00, 0xe7e7e700, 0x46464600, 0x71717100, 0xbababa00,
     0xd4d4d400, 0x25252500, 0xababab00, 0x42424200, 0x88888800, 0xa2a2a200,
     0x8d8d8d00, 0xfafafa00, 0x72727200, 0x07070700, 0xb9b9b900, 0x55555500,
     0xf8f8f800, 0xeeeeee00, 0xacacac00, 0x0a0a0a00, 0x36363600, 0x49494900,
     0x2a2a2a00, 0x68686800, 0x3c3c3c00, 0x38383800, 0xf1f1f100, 0xa4a4a400,
     0x40404000, 0x28282800, 0xd3d3d300, 0x7b7b7b00, 0xbbbbbb00, 0xc9c9c900,
     0x43434300, 0xc1c1c100, 0x15151500, 0xe3e3e300, 0xadadad00, 0xf4f4f400,
     0x77777700, 0xc7c7c700, 0x80808000, 0x9e9e9e00},
    {0x70700070, 0x2c2c002c, 0xb3b300b3, 0xc0c000c0, 0xe4e400e4, 0x57570057,
     0xeaea00ea, 0xaeae00ae, 0x23230023, 0x6b6b006b, 0x45450045, 0xa5a500a5,
     0xeded00ed, 0x4f4f004f, 0x1d1d001d, 0x92920092, 0x86860086, 0xafaf00af,
     0x7c7c007c, 0x1f1f001f, 0x3e3e003e, 0xdcdc00dc, 0x5e5e005e, 0x0b0b000b,
     0xa6a600a6, 0x39390039, 0xd5d500d5, 0x5d5d005d, 0xd9d900d9, 0x5a5a005a,
     0x51510051, 0x6c6c006c, 0x8b8b008b, 0x9a9a009a, 0xfbfb00fb, 0xb0b000b0,
     0x74740074, 0x2b2b002b, 0xf0f000f0, 0x84840084, 0xdfdf00df, 0xcbcb00cb,
     0x34340034, 0x76760076, 0x6d6d006d, 0xa9a900a9, 0xd1d100d1, 0x04040004,
     0x14140014, 0x3a3a003a, 0xdede00de, 0x11110011, 0x32320032, 0x9c9c009c,
     0x53530053, 0xf2f200f2, 0xfefe00fe, 0xcfcf00cf, 0xc3c300c3, 0x7a7a007a,
     0x24240024, 0xe8e800e8, 0x60600060, 0x69690069, 0xaaaa00aa, 0xa0a000a0,
     0xa1a100a1, 0x62620062, 0x54540054, 0x1e1e001e, 0xe0e000e0, 0x64640064,
     0x10100010, 0x00000000, 0xa3a300a3, 0x75750075, 0x8a8a008a, 0xe6e600e6,
     0x09090009, 0xdddd00dd, 0x87870087, 0x83830083, 0xcdcd00cd, 0x90900090,
     0x73730073, 0xf6f600f6, 0x9d9d009d, 0xbfbf00bf, 0x52520052, 0xd8d800d8,
     0xc8c800c8, 0xc6c600c6, 0x81810081, 0x6f6f006f, 0x13130013, 0x63630063,
     0xe9e900e9, 0xa7a700a7, 0x9f9f009f, 0xbcbc00bc, 0x29290029, 0xf9f900f9,
     0x2f2f002f, 0xb4b400b4, 0x78780078, 0x06060006, 0xe7e700e7, 0x71710071,
     0xd4d400d4, 0xabab00ab, 0x88880088, 0x8d8d008d, 0x72720072, 0xb9b900b9,
     0xf8f800f8, 0xacac00ac, 0x36360036, 0x2a2a002a, 0x3c3c003c, 0xf1f100f1,
     0x40400040, 0xd3d300d3, 0xbbbb00bb, 0x43430043, 0x15150015, 0xadad00ad,
     0x77770077, 0x80800080, 0x82820082, 0xecec00ec, 0x27270027, 0xe5e500e5,
     0x85850085, 0x35350035, 0x0c0c000c, 0x41410041, 0xefef00ef, 0x93930093,
     0x19190019, 0x21210021, 0x0e0e000e, 0x4e4e004e, 0x65650065, 0xbdbd00bd,
     0xb8b800b8, 0x8f8f008f, 0xebeb00eb, 0xcece00ce, 0x30300030, 0x5f5f005f,
     0xc5c500c5, 0x1a1a001a, 0xe1e100e1, 0xcaca00ca, 0x47470047, 0x3d3d003d,
     0x01010001, 0xd6d600d6, 0x56560056, 0x4d4d004d, 0x0d0d000d, 0x66660066,
     0xcccc00cc, 0x2d2d002d, 0x12120012, 0x20200020, 0xb1b100b1, 0x99990099,
     0x4c4c004c, 0xc2c200c2, 0x7e7e007e, 0x05050005, 0xb7b700b7, 0x31310031,
     0x17170017, 0xd7d700d7, 0x58580058, 0x61610061, 0x1b1b001b, 0x1c1c001c,
     0x0f0f000f, 0x16160016, 0x18180018, 0x22220022, 0x44440044, 0xb2b200b2,
     0xb5b500b5, 0x91910091, 0x08080008, 0xa8a800a8, 0xfcfc00fc, 0x50500050,
     0xd0d000d0, 0x7d7d007d, 0x89890089, 0x97970097, 0x5b5b005b, 0x95950095,
     0xffff00ff, 0xd2d200d2, 0xc4c400c4, 0x48480048, 0xf7f700f7, 0xdbdb00db,
     0x03030003, 0xdada00da, 0x3f3f003f, 0x94940094, 0x5c5c005c, 0x02020002,
     0x4a4a004a, 0x33330033, 0x67670067, 0xf3f300f3, 0x7f7f007f, 0xe2e200e2,
     0x9b9b009b, 0x26260026, 0x37370037, 0x3b3b003b, 0x96960096, 0x4b4b004b,
     0xbebe00be, 0x2e2e002e, 0x79790079, 0x8c8c008c, 0x6e6e006e, 0x8e8e008e,
     0xf5f500f5, 0xb6b600b6, 0xfdfd00fd, 0x59590059, 0x98980098, 0x6a6a006a,
     0x46460046, 0xbaba00ba, 0x25250025, 0x42420042, 0xa2a200a2, 0xfafa00fa,
     0x07070007, 0x55550055, 0xeeee00ee, 0x0a0a000a, 0x49490049, 0x68680068,
     0x38380038, 0xa4a400a4, 0x28280028, 0x7b7b007b, 0xc9c900c9, 0xc1c100c1,
     0xe3e300e3, 0xf4f400f4, 0xc7c700c7, 0x9e9e009e},
    {0x00e0e0e0, 0x00050505, 0x00585858, 0x00d9d9d9, 0x00676767, 0x004e4e4e,
     0x00818181, 0x00cbcbcb, 0x00c9c9c9, 0x000b0b0b, 0x00aeaeae, 0x006a6a6a,
     0x00d5d5d5, 0x00181818, 0x005d5d5d, 0x00828282, 0x00464646, 0x00dfdfdf,
     0x00d6d6d6, 0x00272727, 0x008a8a8a, 0x00323232, 0x004b4b4b, 0x00424242,
     0x00dbdbdb, 0x001c1c1c, 0x009e9e9e, 0x009c9c9c, 0x003a3a3a, 0x00cacaca,
     0x00252525, 0x007b7b7b, 0x000d0d0d, 0x00717171, 0x005f5f5f, 0x001f1f1f,
     0x00f8f8f8, 0x00d7d7d7, 0x003e3e3e, 0x009d9d9d, 0x007c7c7c, 0x00606060,
     0x00b9b9b9, 0x00bebebe, 0x00bcbcbc, 0x008b8b8b, 0x00161616, 0x00343434,
     0x004d4d4d, 0x00c3c3c3, 0x00727272, 0x00959595, 0x00ababab, 0x008e8e8e,
     0x00bababa, 0x007a7a7a, 0x00b3b3b3, 0x00020202, 0x00b4b4b4, 0x00adadad,
     0x00a2a2a2, 0x00acacac, 0x00d8d8d8, 0x009a9a9a, 0x00171717, 0x001a1a1a,
     0x00353535, 0x00cccccc, 0x00f7f7f7, 0x00999999, 0x00616161, 0x005a5a5a,
     0x00e8e8e8, 0x00242424, 0x00565656, 0x00404040, 0x00e1e1e1, 0x00636363,
     0x00090909, 0x00333333, 0x00bfbfbf, 0x00989898, 0x00979797, 0x00858585,
     0x00686868, 0x00fcfcfc, 0x00ececec, 0x000a0a0a, 0x00dadada, 0x006f6f6f,
     0x00535353, 0x00626262, 0x00a3a3a3, 0x002e2e2e, 0x00080808, 0x00afafaf,
     0x00282828, 0x00b0b0b0, 0x00747474, 0x00c2c2c2, 0x00bdbdbd, 0x00363636,
     0x00222222, 0x00383838, 0x00646464, 0x001e1e1e, 0x00393939, 0x002c2c2c,
     0x00a6a6a6, 0x00303030, 0x00e5e5e5, 0x00444444, 0x00fdfdfd, 0x00888888,
     0x009f9f9f, 0x00656565, 0x00878787, 0x006b6b6b, 0x00f4f4f4, 0x00232323,
     0x00484848, 0x00101010, 0x00d1d1d1, 0x00515151, 0x00c0c0c0, 0x00f9f9f9,
     0x00d2d2d2, 0x00a0a0a0, 0x00555555, 0x00a1a1a1, 0x00414141, 0x00fafafa,
     0x00434343, 0x00131313, 0x00c4c4c4, 0x002f2f2f, 0x00a8a8a8, 0x00b6b6b6,
     0x003c3c3c, 0x002b2b2b, 0x00c1c1c1, 0x00ffffff, 0x00c8c8c8, 0x00a5a5a5,
     0x00202020, 0x00898989, 0x00000000, 0x00909090, 0x00474747, 0x00efefef,
     0x00eaeaea, 0x00b7b7b7, 0x00151515, 0x00060606, 0x00cdcdcd, 0x00b5b5b5,
     0x00121212, 0x007e7e7e, 0x00bbbbbb, 0x00292929, 0x000f0f0f, 0x00b8b8b8,
     0x00070707, 0x00040404, 0x009b9b9b, 0x00949494, 0x00212121, 0x00666666,
     0x00e6e6e6, 0x00cecece, 0x00ededed, 0x00e7e7e7, 0x003b3b3b, 0x00fefefe,
     0x007f7f7f, 0x00c5c5c5, 0x00a4a4a4, 0x00373737, 0x00b1b1b1, 0x004c4c4c,
     0x00919191, 0x006e6e6e, 0x008d8d8d, 0x00767676, 0x00030303, 0x002d2d2d,
     0x00dedede, 0x00969696, 0x00262626, 0x007d7d7d, 0x00c6c6c6, 0x005c5c5c,
     0x00d3d3d3, 0x00f2f2f2, 0x004f4f4f, 0x00191919, 0x003f3f3f, 0x00dcdcdc,
     0x00797979, 0x001d1d1d, 0x00525252, 0x00ebebeb, 0x00f3f3f3, 0x006d6d6d,
     0x005e5e5e, 0x00fbfbfb, 0x00696969, 0x00b2b2b2, 0x00f0f0f0, 0x00313131,
     0x000c0c0c, 0x00d4d4d4, 0x00cfcfcf, 0x008c8c8c, 0x00e2e2e2, 0x00757575,
     0x00a9a9a9, 0x004a4a4a, 0x00575757, 0x00848484, 0x00111111, 0x00454545,
     0x001b1b1b, 0x00f5f5f5, 0x00e4e4e4, 0x000e0e0e, 0x00737373, 0x00aaaaaa,
     0x00f1f1f1, 0x00dddddd, 0x00595959, 0x00141414, 0x006c6c6c, 0x00929292,
     0x00545454, 0x00d0d0d0, 0x00787878, 0x00707070, 0x00e3e3e3, 0x00494949,
     0x00808080, 0x00505050, 0x00a7a7a7, 0x00f6f6f6, 0x00777777, 0x00939393,
     0x00868686, 0x00838383, 0x002a2a2a, 0x00c7c7c7, 0x005b5b5b, 0x00e9e9e9,
     0x00eeeeee, 0x008f8f8f, 0x00010101, 0x003d3d3d},
    {0x38003838, 0x41004141, 0x16001616, 0x76007676, 0xd900d9d9, 0x93009393,
     0x60006060, 0xf200f2f2, 0x72007272, 0xc200c2c2, 0xab00abab, 0x9a009a9a,
     0x75007575, 0x06000606, 0x57005757, 0xa000a0a0, 0x91009191, 0xf700f7f7,
     0xb500b5b5, 0xc900c9c9, 0xa200a2a2, 0x8c008c8c, 0xd200d2d2, 0x90009090,
     0xf600f6f6, 0x07000707, 0xa700a7a7, 0x27002727, 0x8e008e8e, 0xb200b2b2,
     0x49004949, 0xde00dede, 0x43004343, 0x5c005c5c, 0xd700d7d7, 0xc700c7c7,
     0x3e003e3e, 0xf500f5f5, 0x8f008f8f, 0x67006767, 0x1f001f1f, 0x18001818,
     0x6e006e6e, 0xaf00afaf, 0x2f002f2f, 0xe200e2e2, 0x85008585, 0x0d000d0d,
     0x53005353, 0xf000f0f0, 0x9c009c9c, 0x65006565, 0xea00eaea, 0xa300a3a3,
     0xae00aeae, 0x9e009e9e, 0xec00ecec, 0x80008080, 0x2d002d2d, 0x6b006b6b,
     0xa800a8a8, 0x2b002b2b, 0x36003636, 0xa600a6a6, 0xc500c5c5, 0x86008686,
     0x4d004d4d, 0x33003333, 0xfd00fdfd, 0x66006666, 0x58005858, 0x96009696,
     0x3a003a3a, 0x09000909, 0x95009595, 0x10001010, 0x78007878, 0xd800d8d8,
     0x42004242, 0xcc00cccc, 0xef00efef, 0x26002626, 0xe500e5e5, 0x61006161,
     0x1a001a1a, 0x3f003f3f, 0x3b003b3b, 0x82008282, 0xb600b6b6, 0xdb00dbdb,
     0xd400d4d4, 0x98009898, 0xe800e8e8, 0x8b008b8b, 0x02000202, 0xeb00ebeb,
     0x0a000a0a, 0x2c002c2c, 0x1d001d1d, 0xb000b0b0, 0x6f006f6f, 0x8d008d8d,
     0x88008888, 0x0e000e0e, 0x19001919, 0x87008787, 0x4e004e4e, 0x0b000b0b,
     0xa900a9a9, 0x0c000c0c, 0x79007979, 0x11001111, 0x7f007f7f, 0x22002222,
     0xe700e7e7, 0x59005959, 0xe100e1e1, 0xda00dada, 0x3d003d3d, 0xc800c8c8,
     0x12001212, 0x04000404, 0x74007474, 0x54005454, 0x30003030, 0x7e007e7e,
     0xb400b4b4, 0x28002828, 0x55005555, 0x68006868, 0x50005050, 0xbe00bebe,
     0xd000d0d0, 0xc400c4c4, 0x31003131, 0xcb00cbcb, 0x2a002a2a, 0xad00adad,
     0x0f000f0f, 0xca00caca, 0x70007070, 0xff00ffff, 0x32003232, 0x69006969,
     0x08000808, 0x62006262, 0x00000000, 0x24002424, 0xd100d1d1, 0xfb00fbfb,
     0xba00baba, 0xed00eded, 0x45004545, 0x81008181, 0x73007373, 0x6d006d6d,
     0x84008484, 0x9f009f9f, 0xee00eeee, 0x4a004a4a, 0xc300c3c3, 0x2e002e2e,
     0xc100c1c1, 0x01000101, 0xe600e6e6, 0x25002525, 0x48004848, 0x99009999,
     0xb900b9b9, 0xb300b3b3, 0x7b007b7b, 0xf900f9f9, 0xce00cece, 0xbf00bfbf,
     0xdf00dfdf, 0x71007171, 0x29002929, 0xcd00cdcd, 0x6c006c6c, 0x13001313,
     0x64006464, 0x9b009b9b, 0x63006363, 0x9d009d9d, 0xc000c0c0, 0x4b004b4b,
     0xb700b7b7, 0xa500a5a5, 0x89008989, 0x5f005f5f, 0xb100b1b1, 0x17001717,
     0xf400f4f4, 0xbc00bcbc, 0xd300d3d3, 0x46004646, 0xcf00cfcf, 0x37003737,
     0x5e005e5e, 0x47004747, 0x94009494, 0xfa00fafa, 0xfc00fcfc, 0x5b005b5b,
     0x97009797, 0xfe00fefe, 0x5a005a5a, 0xac00acac, 0x3c003c3c, 0x4c004c4c,
     0x03000303, 0x35003535, 0xf300f3f3, 0x23002323, 0xb800b8b8, 0x5d005d5d,
     0x6a006a6a, 0x92009292, 0xd500d5d5, 0x21002121, 0x44004444, 0x51005151,
     0xc600c6c6, 0x7d007d7d, 0x39003939, 0x83008383, 0xdc00dcdc, 0xaa00aaaa,
     0x7c007c7c, 0x77007777, 0x56005656, 0x05000505, 0x1b001b1b, 0xa400a4a4,
     0x15001515, 0x34003434, 0x1e001e1e, 0x1c001c1c, 0xf800f8f8, 0x52005252,
     0x20002020, 0x14001414, 0xe900e9e9, 0xbd00bdbd, 0xdd00dddd, 0xe400e4e4,
     0xa100a1a1, 0xe000e0e0, 0x8a008a8a, 0xf100f1f1, 0xd600d6d6, 0x7a007a7a,
     0xbb00bbbb, 0xe300e3e3, 0x40004040, 0x4f004f4f}
};

/* Key generation constants */
static const u32 SIGMA[] = {
    0xa09e667f, 0x3bcc908b, 0xb67ae858, 0x4caa73b2, 0xc6ef372f, 0xe94f82be,
    0x54ff53a5, 0xf1d36f1c, 0x10e527fa, 0xde682d1d, 0xb05688c2, 0xb3e6c1fd
};

/* The phi algorithm given in C.2.7 of the Camellia spec document. */
/*
 * This version does not attempt to minimize amount of temporary
 * variables, but instead explicitly exposes algorithm's parallelism.
 * It is therefore most appropriate for platforms with not less than
 * ~16 registers. For platforms with less registers [well, x86 to be
 * specific] assembler version should be/is provided anyway...
 */
#define Camellia_Feistel(_s0,_s1,_s2,_s3,_key) do {\
        register u32 _t0,_t1,_t2,_t3;\
\
        _t0  = _s0 ^ (_key)[0];\
        _t3  = SBOX4_4404[_t0&0xff];\
        _t1  = _s1 ^ (_key)[1];\
        _t3 ^= SBOX3_3033[(_t0 >> 8)&0xff];\
        _t2  = SBOX1_1110[_t1&0xff];\
        _t3 ^= SBOX2_0222[(_t0 >> 16)&0xff];\
        _t2 ^= SBOX4_4404[(_t1 >> 8)&0xff];\
        _t3 ^= SBOX1_1110[(_t0 >> 24)];\
        _t2 ^= _t3;\
        _t3  = RightRotate(_t3,8);\
        _t2 ^= SBOX3_3033[(_t1 >> 16)&0xff];\
        _s3 ^= _t3;\
        _t2 ^= SBOX2_0222[(_t1 >> 24)];\
        _s2 ^= _t2; \
        _s3 ^= _t2;\
} while(0)

/*
 * Note that n has to be less than 32. Rotations for larger amount
 * of bits are achieved by "rotating" order of s-elements and
 * adjusting n accordingly, e.g. RotLeft128(s1,s2,s3,s0,n-32).
 */
#define RotLeft128(_s0,_s1,_s2,_s3,_n) do {\
        u32 _t0=_s0>>(32-_n);\
        _s0 = (_s0<<_n) | (_s1>>(32-_n));\
        _s1 = (_s1<<_n) | (_s2>>(32-_n));\
        _s2 = (_s2<<_n) | (_s3>>(32-_n));\
        _s3 = (_s3<<_n) | _t0;\
} while (0)

int Camellia_Ekeygen(int keyBitLength, const u8 *rawKey, KEY_TABLE_TYPE k)
{
    register u32 s0, s1, s2, s3;

    k[0] = s0 = GETU32(rawKey);
    k[1] = s1 = GETU32(rawKey + 4);
    k[2] = s2 = GETU32(rawKey + 8);
    k[3] = s3 = GETU32(rawKey + 12);

    if (keyBitLength != 128) {
        k[8] = s0 = GETU32(rawKey + 16);
        k[9] = s1 = GETU32(rawKey + 20);
        if (keyBitLength == 192) {
            k[10] = s2 = ~s0;
            k[11] = s3 = ~s1;
        } else {
            k[10] = s2 = GETU32(rawKey + 24);
            k[11] = s3 = GETU32(rawKey + 28);
        }
        s0 ^= k[0], s1 ^= k[1], s2 ^= k[2], s3 ^= k[3];
    }

    /* Use the Feistel routine to scramble the key material */
    Camellia_Feistel(s0, s1, s2, s3, SIGMA + 0);
    Camellia_Feistel(s2, s3, s0, s1, SIGMA + 2);

    s0 ^= k[0], s1 ^= k[1], s2 ^= k[2], s3 ^= k[3];
    Camellia_Feistel(s0, s1, s2, s3, SIGMA + 4);
    Camellia_Feistel(s2, s3, s0, s1, SIGMA + 6);

    /* Fill the keyTable. Requires many block rotations. */
    if (keyBitLength == 128) {
        k[4] = s0, k[5] = s1, k[6] = s2, k[7] = s3;
        RotLeft128(s0, s1, s2, s3, 15); /* KA <<< 15 */
        k[12] = s0, k[13] = s1, k[14] = s2, k[15] = s3;
        RotLeft128(s0, s1, s2, s3, 15); /* KA <<< 30 */
        k[16] = s0, k[17] = s1, k[18] = s2, k[19] = s3;
        RotLeft128(s0, s1, s2, s3, 15); /* KA <<< 45 */
        k[24] = s0, k[25] = s1;
        RotLeft128(s0, s1, s2, s3, 15); /* KA <<< 60 */
        k[28] = s0, k[29] = s1, k[30] = s2, k[31] = s3;
        RotLeft128(s1, s2, s3, s0, 2); /* KA <<< 94 */
        k[40] = s1, k[41] = s2, k[42] = s3, k[43] = s0;
        RotLeft128(s1, s2, s3, s0, 17); /* KA <<<111 */
        k[48] = s1, k[49] = s2, k[50] = s3, k[51] = s0;

        s0 = k[0], s1 = k[1], s2 = k[2], s3 = k[3];
        RotLeft128(s0, s1, s2, s3, 15); /* KL <<< 15 */
        k[8] = s0, k[9] = s1, k[10] = s2, k[11] = s3;
        RotLeft128(s0, s1, s2, s3, 30); /* KL <<< 45 */
        k[20] = s0, k[21] = s1, k[22] = s2, k[23] = s3;
        RotLeft128(s0, s1, s2, s3, 15); /* KL <<< 60 */
        k[26] = s2, k[27] = s3;
        RotLeft128(s0, s1, s2, s3, 17); /* KL <<< 77 */
        k[32] = s0, k[33] = s1, k[34] = s2, k[35] = s3;
        RotLeft128(s0, s1, s2, s3, 17); /* KL <<< 94 */
        k[36] = s0, k[37] = s1, k[38] = s2, k[39] = s3;
        RotLeft128(s0, s1, s2, s3, 17); /* KL <<<111 */
        k[44] = s0, k[45] = s1, k[46] = s2, k[47] = s3;

        return 3;               /* grand rounds */
    } else {
        k[12] = s0, k[13] = s1, k[14] = s2, k[15] = s3;
        s0 ^= k[8], s1 ^= k[9], s2 ^= k[10], s3 ^= k[11];
        Camellia_Feistel(s0, s1, s2, s3, (SIGMA + 8));
        Camellia_Feistel(s2, s3, s0, s1, (SIGMA + 10));

        k[4] = s0, k[5] = s1, k[6] = s2, k[7] = s3;
        RotLeft128(s0, s1, s2, s3, 30); /* KB <<< 30 */
        k[20] = s0, k[21] = s1, k[22] = s2, k[23] = s3;
        RotLeft128(s0, s1, s2, s3, 30); /* KB <<< 60 */
        k[40] = s0, k[41] = s1, k[42] = s2, k[43] = s3;
        RotLeft128(s1, s2, s3, s0, 19); /* KB <<<111 */
        k[64] = s1, k[65] = s2, k[66] = s3, k[67] = s0;

        s0 = k[8], s1 = k[9], s2 = k[10], s3 = k[11];
        RotLeft128(s0, s1, s2, s3, 15); /* KR <<< 15 */
        k[8] = s0, k[9] = s1, k[10] = s2, k[11] = s3;
        RotLeft128(s0, s1, s2, s3, 15); /* KR <<< 30 */
        k[16] = s0, k[17] = s1, k[18] = s2, k[19] = s3;
        RotLeft128(s0, s1, s2, s3, 30); /* KR <<< 60 */
        k[36] = s0, k[37] = s1, k[38] = s2, k[39] = s3;
        RotLeft128(s1, s2, s3, s0, 2); /* KR <<< 94 */
        k[52] = s1, k[53] = s2, k[54] = s3, k[55] = s0;

        s0 = k[12], s1 = k[13], s2 = k[14], s3 = k[15];
        RotLeft128(s0, s1, s2, s3, 15); /* KA <<< 15 */
        k[12] = s0, k[13] = s1, k[14] = s2, k[15] = s3;
        RotLeft128(s0, s1, s2, s3, 30); /* KA <<< 45 */
        k[28] = s0, k[29] = s1, k[30] = s2, k[31] = s3;
        /* KA <<< 77 */
        k[48] = s1, k[49] = s2, k[50] = s3, k[51] = s0;
        RotLeft128(s1, s2, s3, s0, 17); /* KA <<< 94 */
        k[56] = s1, k[57] = s2, k[58] = s3, k[59] = s0;

        s0 = k[0], s1 = k[1], s2 = k[2], s3 = k[3];
        RotLeft128(s1, s2, s3, s0, 13); /* KL <<< 45 */
        k[24] = s1, k[25] = s2, k[26] = s3, k[27] = s0;
        RotLeft128(s1, s2, s3, s0, 15); /* KL <<< 60 */
        k[32] = s1, k[33] = s2, k[34] = s3, k[35] = s0;
        RotLeft128(s1, s2, s3, s0, 17); /* KL <<< 77 */
        k[44] = s1, k[45] = s2, k[46] = s3, k[47] = s0;
        RotLeft128(s2, s3, s0, s1, 2); /* KL <<<111 */
        k[60] = s2, k[61] = s3, k[62] = s0, k[63] = s1;

        return 4;               /* grand rounds */
    }
    /*
     * It is possible to perform certain precalculations, which
     * would spare few cycles in block procedure. It's not done,
     * because it upsets the performance balance between key
     * setup and block procedures, negatively affecting overall
     * throughput in applications operating on short messages
     * and volatile keys.
     */
}

void Camellia_EncryptBlock_Rounds(int grandRounds, const u8 plaintext[],
                                  const KEY_TABLE_TYPE keyTable,
                                  u8 ciphertext[])
{
    register u32 s0, s1, s2, s3;
    const u32 *k = keyTable, *kend = keyTable + grandRounds * 16;

    s0 = GETU32(plaintext) ^ k[0];
    s1 = GETU32(plaintext + 4) ^ k[1];
    s2 = GETU32(plaintext + 8) ^ k[2];
    s3 = GETU32(plaintext + 12) ^ k[3];
    k += 4;

    while (1) {
        /* Camellia makes 6 Feistel rounds */
        Camellia_Feistel(s0, s1, s2, s3, k + 0);
        Camellia_Feistel(s2, s3, s0, s1, k + 2);
        Camellia_Feistel(s0, s1, s2, s3, k + 4);
        Camellia_Feistel(s2, s3, s0, s1, k + 6);
        Camellia_Feistel(s0, s1, s2, s3, k + 8);
        Camellia_Feistel(s2, s3, s0, s1, k + 10);
        k += 12;

        if (k == kend)
            break;

        /*
         * This is the same function as the diffusion function D of the
         * accompanying documentation. See section 3.2 for properties of the
         * FLlayer function.
         */
        s1 ^= LeftRotate(s0 & k[0], 1);
        s2 ^= s3 | k[3];
        s0 ^= s1 | k[1];
        s3 ^= LeftRotate(s2 & k[2], 1);
        k += 4;
    }

    s2 ^= k[0], s3 ^= k[1], s0 ^= k[2], s1 ^= k[3];

    PUTU32(ciphertext, s2);
    PUTU32(ciphertext + 4, s3);
    PUTU32(ciphertext + 8, s0);
    PUTU32(ciphertext + 12, s1);
}

void Camellia_EncryptBlock(int keyBitLength, const u8 plaintext[],
                           const KEY_TABLE_TYPE keyTable, u8 ciphertext[])
{
    Camellia_EncryptBlock_Rounds(keyBitLength == 128 ? 3 : 4,
                                 plaintext, keyTable, ciphertext);
}

void Camellia_DecryptBlock_Rounds(int grandRounds, const u8 ciphertext[],
                                  const KEY_TABLE_TYPE keyTable,
                                  u8 plaintext[])
{
    u32 s0, s1, s2, s3;
    const u32 *k = keyTable + grandRounds * 16, *kend = keyTable + 4;

    s0 = GETU32(ciphertext) ^ k[0];
    s1 = GETU32(ciphertext + 4) ^ k[1];
    s2 = GETU32(ciphertext + 8) ^ k[2];
    s3 = GETU32(ciphertext + 12) ^ k[3];

    while (1) {
        /* Camellia makes 6 Feistel rounds */
        k -= 12;
        Camellia_Feistel(s0, s1, s2, s3, k + 10);
        Camellia_Feistel(s2, s3, s0, s1, k + 8);
        Camellia_Feistel(s0, s1, s2, s3, k + 6);
        Camellia_Feistel(s2, s3, s0, s1, k + 4);
        Camellia_Feistel(s0, s1, s2, s3, k + 2);
        Camellia_Feistel(s2, s3, s0, s1, k + 0);

        if (k == kend)
            break;

        /*
         * This is the same function as the diffusion function D of the
         * accompanying documentation. See section 3.2 for properties of the
         * FLlayer function.
         */
        k -= 4;
        s1 ^= LeftRotate(s0 & k[2], 1);
        s2 ^= s3 | k[1];
        s0 ^= s1 | k[3];
        s3 ^= LeftRotate(s2 & k[0], 1);
    }

    k -= 4;
    s2 ^= k[0], s3 ^= k[1], s0 ^= k[2], s1 ^= k[3];

    PUTU32(plaintext, s2);
    PUTU32(plaintext + 4, s3);
    PUTU32(plaintext + 8, s0);
    PUTU32(plaintext + 12, s1);
}

void Camellia_DecryptBlock(int keyBitLength, const u8 ciphertext[],
                           const KEY_TABLE_TYPE keyTable, u8 plaintext[])
{
    Camellia_DecryptBlock_Rounds(keyBitLength == 128 ? 3 : 4,
                                 ciphertext, keyTable, plaintext);
}