cast6.c

/* Copyright (c) 2009, Markus Peloquin <markus@cs.wisc.edu>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED 'AS IS' AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <assert.h>
#include <features.h>
#include <stdint.h>
#include <string.h>

#ifdef GEN_TABLES
#	include <stdio.h>
#endif

#include "cast6.h"
#include "crypto_ops.h"
#include "endian.h"

#ifdef CAST6_TEST
uint8_t cast6_iv_rotk[12][4];
uint32_t cast6_iv_mask[12][4];
uint8_t cast6_iv_out[12][CAST6_BLOCK];
uint8_t cast6_iv_idx;

void add_intermediate_values(uint8_t i,
    const uint8_t rotk[4], const uint32_t mask[4],
    uint32_t b0, uint32_t b1, uint32_t b2, uint32_t b3)
{
	uint32_t block[] = { b0, b1, b2, b3 };
	htobe32_buf(cast6_iv_out[i], block, CAST6_BLOCK);
	memcpy(cast6_iv_rotk[i], rotk, 4);
	memcpy(cast6_iv_mask[i], mask, 16);
}
#define INIT_IV() do { cast6_iv_idx = 0; } while(0)
#define ADD_IV(kr, km)						do \
{								\
	add_intermediate_values(cast6_iv_idx++, kr, km,		\
	    b0, b1, b2, b3);					\
}								while(0)
#else /* !defined(CAST6_TEST) */
#define INIT_IV() do {} while(0)
#define ADD_IV(kr, km) do {} while(0)
#endif

const uint32_t sbox1[0x100] = {
	0x30fb40d4, 0x9fa0ff0b, 0x6beccd2f, 0x3f258c7a,
	0x1e213f2f, 0x9c004dd3, 0x6003e540, 0xcf9fc949,
	0xbfd4af27, 0x88bbbdb5, 0xe2034090, 0x98d09675,
	0x6e63a0e0, 0x15c361d2, 0xc2e7661d, 0x22d4ff8e,
	0x28683b6f, 0xc07fd059, 0xff2379c8, 0x775f50e2,
	0x43c340d3, 0xdf2f8656, 0x887ca41a, 0xa2d2bd2d,
	0xa1c9e0d6, 0x346c4819, 0x61b76d87, 0x22540f2f,
	0x2abe32e1, 0xaa54166b, 0x22568e3a, 0xa2d341d0,
	0x66db40c8, 0xa784392f, 0x004dff2f, 0x2db9d2de,
	0x97943fac, 0x4a97c1d8, 0x527644b7, 0xb5f437a7,
	0xb82cbaef, 0xd751d159, 0x6ff7f0ed, 0x5a097a1f,
	0x827b68d0, 0x90ecf52e, 0x22b0c054, 0xbc8e5935,
	0x4b6d2f7f, 0x50bb64a2, 0xd2664910, 0xbee5812d,
	0xb7332290, 0xe93b159f, 0xb48ee411, 0x4bff345d,
	0xfd45c240, 0xad31973f, 0xc4f6d02e, 0x55fc8165,
	0xd5b1caad, 0xa1ac2dae, 0xa2d4b76d, 0xc19b0c50,
	0x882240f2, 0x0c6e4f38, 0xa4e4bfd7, 0x4f5ba272,
	0x564c1d2f, 0xc59c5319, 0xb949e354, 0xb04669fe,
	0xb1b6ab8a, 0xc71358dd, 0x6385c545, 0x110f935d,
	0x57538ad5, 0x6a390493, 0xe63d37e0, 0x2a54f6b3,
	0x3a787d5f, 0x6276a0b5, 0x19a6fcdf, 0x7a42206a,
	0x29f9d4d5, 0xf61b1891, 0xbb72275e, 0xaa508167,
	0x38901091, 0xc6b505eb, 0x84c7cb8c, 0x2ad75a0f,
	0x874a1427, 0xa2d1936b, 0x2ad286af, 0xaa56d291,
	0xd7894360, 0x425c750d, 0x93b39e26, 0x187184c9,
	0x6c00b32d, 0x73e2bb14, 0xa0bebc3c, 0x54623779,
	0x64459eab, 0x3f328b82, 0x7718cf82, 0x59a2cea6,
	0x04ee002e, 0x89fe78e6, 0x3fab0950, 0x325ff6c2,
	0x81383f05, 0x6963c5c8, 0x76cb5ad6, 0xd49974c9,
	0xca180dcf, 0x380782d5, 0xc7fa5cf6, 0x8ac31511,
	0x35e79e13, 0x47da91d0, 0xf40f9086, 0xa7e2419e,
	0x31366241, 0x051ef495, 0xaa573b04, 0x4a805d8d,
	0x548300d0, 0x00322a3c, 0xbf64cddf, 0xba57a68e,
	0x75c6372b, 0x50afd341, 0xa7c13275, 0x915a0bf5,
	0x6b54bfab, 0x2b0b1426, 0xab4cc9d7, 0x449ccd82,
	0xf7fbf265, 0xab85c5f3, 0x1b55db94, 0xaad4e324,
	0xcfa4bd3f, 0x2deaa3e2, 0x9e204d02, 0xc8bd25ac,
	0xeadf55b3, 0xd5bd9e98, 0xe31231b2, 0x2ad5ad6c,
	0x954329de, 0xadbe4528, 0xd8710f69, 0xaa51c90f,
	0xaa786bf6, 0x22513f1e, 0xaa51a79b, 0x2ad344cc,
	0x7b5a41f0, 0xd37cfbad, 0x1b069505, 0x41ece491,
	0xb4c332e6, 0x032268d4, 0xc9600acc, 0xce387e6d,
	0xbf6bb16c, 0x6a70fb78, 0x0d03d9c9, 0xd4df39de,
	0xe01063da, 0x4736f464, 0x5ad328d8, 0xb347cc96,
	0x75bb0fc3, 0x98511bfb, 0x4ffbcc35, 0xb58bcf6a,
	0xe11f0abc, 0xbfc5fe4a, 0xa70aec10, 0xac39570a,
	0x3f04442f, 0x6188b153, 0xe0397a2e, 0x5727cb79,
	0x9ceb418f, 0x1cacd68d, 0x2ad37c96, 0x0175cb9d,
	0xc69dff09, 0xc75b65f0, 0xd9db40d8, 0xec0e7779,
	0x4744ead4, 0xb11c3274, 0xdd24cb9e, 0x7e1c54bd,
	0xf01144f9, 0xd2240eb1, 0x9675b3fd, 0xa3ac3755,
	0xd47c27af, 0x51c85f4d, 0x56907596, 0xa5bb15e6,
	0x580304f0, 0xca042cf1, 0x011a37ea, 0x8dbfaadb,
	0x35ba3e4a, 0x3526ffa0, 0xc37b4d09, 0xbc306ed9,
	0x98a52666, 0x5648f725, 0xff5e569d, 0x0ced63d0,
	0x7c63b2cf, 0x700b45e1, 0xd5ea50f1, 0x85a92872,
	0xaf1fbda7, 0xd4234870, 0xa7870bf3, 0x2d3b4d79,
	0x42e04198, 0x0cd0ede7, 0x26470db8, 0xf881814c,
	0x474d6ad7, 0x7c0c5e5c, 0xd1231959, 0x381b7298,
	0xf5d2f4db, 0xab838653, 0x6e2f1e23, 0x83719c9e,
	0xbd91e046, 0x9a56456e, 0xdc39200c, 0x20c8c571,
	0x962bda1c, 0xe1e696ff, 0xb141ab08, 0x7cca89b9,
	0x1a69e783, 0x02cc4843, 0xa2f7c579, 0x429ef47d,
	0x427b169c, 0x5ac9f049, 0xdd8f0f00, 0x5c8165bf
};

const uint32_t sbox2[0x100] = {
	0x1f201094, 0xef0ba75b, 0x69e3cf7e, 0x393f4380,
	0xfe61cf7a, 0xeec5207a, 0x55889c94, 0x72fc0651,
	0xada7ef79, 0x4e1d7235, 0xd55a63ce, 0xde0436ba,
	0x99c430ef, 0x5f0c0794, 0x18dcdb7d, 0xa1d6eff3,
	0xa0b52f7b, 0x59e83605, 0xee15b094, 0xe9ffd909,
	0xdc440086, 0xef944459, 0xba83ccb3, 0xe0c3cdfb,
	0xd1da4181, 0x3b092ab1, 0xf997f1c1, 0xa5e6cf7b,
	0x01420ddb, 0xe4e7ef5b, 0x25a1ff41, 0xe180f806,
	0x1fc41080, 0x179bee7a, 0xd37ac6a9, 0xfe5830a4,
	0x98de8b7f, 0x77e83f4e, 0x79929269, 0x24fa9f7b,
	0xe113c85b, 0xacc40083, 0xd7503525, 0xf7ea615f,
	0x62143154, 0x0d554b63, 0x5d681121, 0xc866c359,
	0x3d63cf73, 0xcee234c0, 0xd4d87e87, 0x5c672b21,
	0x071f6181, 0x39f7627f, 0x361e3084, 0xe4eb573b,
	0x602f64a4, 0xd63acd9c, 0x1bbc4635, 0x9e81032d,
	0x2701f50c, 0x99847ab4, 0xa0e3df79, 0xba6cf38c,
	0x10843094, 0x2537a95e, 0xf46f6ffe, 0xa1ff3b1f,
	0x208cfb6a, 0x8f458c74, 0xd9e0a227, 0x4ec73a34,
	0xfc884f69, 0x3e4de8df, 0xef0e0088, 0x3559648d,
	0x8a45388c, 0x1d804366, 0x721d9bfd, 0xa58684bb,
	0xe8256333, 0x844e8212, 0x128d8098, 0xfed33fb4,
	0xce280ae1, 0x27e19ba5, 0xd5a6c252, 0xe49754bd,
	0xc5d655dd, 0xeb667064, 0x77840b4d, 0xa1b6a801,
	0x84db26a9, 0xe0b56714, 0x21f043b7, 0xe5d05860,
	0x54f03084, 0x066ff472, 0xa31aa153, 0xdadc4755,
	0xb5625dbf, 0x68561be6, 0x83ca6b94, 0x2d6ed23b,
	0xeccf01db, 0xa6d3d0ba, 0xb6803d5c, 0xaf77a709,
	0x33b4a34c, 0x397bc8d6, 0x5ee22b95, 0x5f0e5304,
	0x81ed6f61, 0x20e74364, 0xb45e1378, 0xde18639b,
	0x881ca122, 0xb96726d1, 0x8049a7e8, 0x22b7da7b,
	0x5e552d25, 0x5272d237, 0x79d2951c, 0xc60d894c,
	0x488cb402, 0x1ba4fe5b, 0xa4b09f6b, 0x1ca815cf,
	0xa20c3005, 0x8871df63, 0xb9de2fcb, 0x0cc6c9e9,
	0x0beeff53, 0xe3214517, 0xb4542835, 0x9f63293c,
	0xee41e729, 0x6e1d2d7c, 0x50045286, 0x1e6685f3,
	0xf33401c6, 0x30a22c95, 0x31a70850, 0x60930f13,
	0x73f98417, 0xa1269859, 0xec645c44, 0x52c877a9,
	0xcdff33a6, 0xa02b1741, 0x7cbad9a2, 0x2180036f,
	0x50d99c08, 0xcb3f4861, 0xc26bd765, 0x64a3f6ab,
	0x80342676, 0x25a75e7b, 0xe4e6d1fc, 0x20c710e6,
	0xcdf0b680, 0x17844d3b, 0x31eef84d, 0x7e0824e4,
	0x2ccb49eb, 0x846a3bae, 0x8ff77888, 0xee5d60f6,
	0x7af75673, 0x2fdd5cdb, 0xa11631c1, 0x30f66f43,
	0xb3faec54, 0x157fd7fa, 0xef8579cc, 0xd152de58,
	0xdb2ffd5e, 0x8f32ce19, 0x306af97a, 0x02f03ef8,
	0x99319ad5, 0xc242fa0f, 0xa7e3ebb0, 0xc68e4906,
	0xb8da230c, 0x80823028, 0xdcdef3c8, 0xd35fb171,
	0x088a1bc8, 0xbec0c560, 0x61a3c9e8, 0xbca8f54d,
	0xc72feffa, 0x22822e99, 0x82c570b4, 0xd8d94e89,
	0x8b1c34bc, 0x301e16e6, 0x273be979, 0xb0ffeaa6,
	0x61d9b8c6, 0x00b24869, 0xb7ffce3f, 0x08dc283b,
	0x43daf65a, 0xf7e19798, 0x7619b72f, 0x8f1c9ba4,
	0xdc8637a0, 0x16a7d3b1, 0x9fc393b7, 0xa7136eeb,
	0xc6bcc63e, 0x1a513742, 0xef6828bc, 0x520365d6,
	0x2d6a77ab, 0x3527ed4b, 0x821fd216, 0x095c6e2e,
	0xdb92f2fb, 0x5eea29cb, 0x145892f5, 0x91584f7f,
	0x5483697b, 0x2667a8cc, 0x85196048, 0x8c4bacea,
	0x833860d4, 0x0d23e0f9, 0x6c387e8a, 0x0ae6d249,
	0xb284600c, 0xd835731d, 0xdcb1c647, 0xac4c56ea,
	0x3ebd81b3, 0x230eabb0, 0x6438bc87, 0xf0b5b1fa,
	0x8f5ea2b3, 0xfc184642, 0x0a036b7a, 0x4fb089bd,
	0x649da589, 0xa345415e, 0x5c038323, 0x3e5d3bb9,
	0x43d79572, 0x7e6dd07c, 0x06dfdf1e, 0x6c6cc4ef,
	0x7160a539, 0x73bfbe70, 0x83877605, 0x4523ecf1
};

const uint32_t sbox3[0x100] = {
	0x8defc240, 0x25fa5d9f, 0xeb903dbf, 0xe810c907,
	0x47607fff, 0x369fe44b, 0x8c1fc644, 0xaececa90,
	0xbeb1f9bf, 0xeefbcaea, 0xe8cf1950, 0x51df07ae,
	0x920e8806, 0xf0ad0548, 0xe13c8d83, 0x927010d5,
	0x11107d9f, 0x07647db9, 0xb2e3e4d4, 0x3d4f285e,
	0xb9afa820, 0xfade82e0, 0xa067268b, 0x8272792e,
	0x553fb2c0, 0x489ae22b, 0xd4ef9794, 0x125e3fbc,
	0x21fffcee, 0x825b1bfd, 0x9255c5ed, 0x1257a240,
	0x4e1a8302, 0xbae07fff, 0x528246e7, 0x8e57140e,
	0x3373f7bf, 0x8c9f8188, 0xa6fc4ee8, 0xc982b5a5,
	0xa8c01db7, 0x579fc264, 0x67094f31, 0xf2bd3f5f,
	0x40fff7c1, 0x1fb78dfc, 0x8e6bd2c1, 0x437be59b,
	0x99b03dbf, 0xb5dbc64b, 0x638dc0e6, 0x55819d99,
	0xa197c81c, 0x4a012d6e, 0xc5884a28, 0xccc36f71,
	0xb843c213, 0x6c0743f1, 0x8309893c, 0x0feddd5f,
	0x2f7fe850, 0xd7c07f7e, 0x02507fbf, 0x5afb9a04,
	0xa747d2d0, 0x1651192e, 0xaf70bf3e, 0x58c31380,
	0x5f98302e, 0x727cc3c4, 0x0a0fb402, 0x0f7fef82,
	0x8c96fdad, 0x5d2c2aae, 0x8ee99a49, 0x50da88b8,
	0x8427f4a0, 0x1eac5790, 0x796fb449, 0x8252dc15,
	0xefbd7d9b, 0xa672597d, 0xada840d8, 0x45f54504,
	0xfa5d7403, 0xe83ec305, 0x4f91751a, 0x925669c2,
	0x23efe941, 0xa903f12e, 0x60270df2, 0x0276e4b6,
	0x94fd6574, 0x927985b2, 0x8276dbcb, 0x02778176,
	0xf8af918d, 0x4e48f79e, 0x8f616ddf, 0xe29d840e,
	0x842f7d83, 0x340ce5c8, 0x96bbb682, 0x93b4b148,
	0xef303cab, 0x984faf28, 0x779faf9b, 0x92dc560d,
	0x224d1e20, 0x8437aa88, 0x7d29dc96, 0x2756d3dc,
	0x8b907cee, 0xb51fd240, 0xe7c07ce3, 0xe566b4a1,
	0xc3e9615e, 0x3cf8209d, 0x6094d1e3, 0xcd9ca341,
	0x5c76460e, 0x00ea983b, 0xd4d67881, 0xfd47572c,
	0xf76cedd9, 0xbda8229c, 0x127dadaa, 0x438a074e,
	0x1f97c090, 0x081bdb8a, 0x93a07ebe, 0xb938ca15,
	0x97b03cff, 0x3dc2c0f8, 0x8d1ab2ec, 0x64380e51,
	0x68cc7bfb, 0xd90f2788, 0x12490181, 0x5de5ffd4,
	0xdd7ef86a, 0x76a2e214, 0xb9a40368, 0x925d958f,
	0x4b39fffa, 0xba39aee9, 0xa4ffd30b, 0xfaf7933b,
	0x6d498623, 0x193cbcfa, 0x27627545, 0x825cf47a,
	0x61bd8ba0, 0xd11e42d1, 0xcead04f4, 0x127ea392,
	0x10428db7, 0x8272a972, 0x9270c4a8, 0x127de50b,
	0x285ba1c8, 0x3c62f44f, 0x35c0eaa5, 0xe805d231,
	0x428929fb, 0xb4fcdf82, 0x4fb66a53, 0x0e7dc15b,
	0x1f081fab, 0x108618ae, 0xfcfd086d, 0xf9ff2889,
	0x694bcc11, 0x236a5cae, 0x12deca4d, 0x2c3f8cc5,
	0xd2d02dfe, 0xf8ef5896, 0xe4cf52da, 0x95155b67,
	0x494a488c, 0xb9b6a80c, 0x5c8f82bc, 0x89d36b45,
	0x3a609437, 0xec00c9a9, 0x44715253, 0x0a874b49,
	0xd773bc40, 0x7c34671c, 0x02717ef6, 0x4feb5536,
	0xa2d02fff, 0xd2bf60c4, 0xd43f03c0, 0x50b4ef6d,
	0x07478cd1, 0x006e1888, 0xa2e53f55, 0xb9e6d4bc,
	0xa2048016, 0x97573833, 0xd7207d67, 0xde0f8f3d,
	0x72f87b33, 0xabcc4f33, 0x7688c55d, 0x7b00a6b0,
	0x947b0001, 0x570075d2, 0xf9bb88f8, 0x8942019e,
	0x4264a5ff, 0x856302e0, 0x72dbd92b, 0xee971b69,
	0x6ea22fde, 0x5f08ae2b, 0xaf7a616d, 0xe5c98767,
	0xcf1febd2, 0x61efc8c2, 0xf1ac2571, 0xcc8239c2,
	0x67214cb8, 0xb1e583d1, 0xb7dc3e62, 0x7f10bdce,
	0xf90a5c38, 0x0ff0443d, 0x606e6dc6, 0x60543a49,
	0x5727c148, 0x2be98a1d, 0x8ab41738, 0x20e1be24,
	0xaf96da0f, 0x68458425, 0x99833be5, 0x600d457d,
	0x282f9350, 0x8334b362, 0xd91d1120, 0x2b6d8da0,
	0x642b1e31, 0x9c305a00, 0x52bce688, 0x1b03588a,
	0xf7baefd5, 0x4142ed9c, 0xa4315c11, 0x83323ec5,
	0xdfef4636, 0xa133c501, 0xe9d3531c, 0xee353783
};

const uint32_t sbox4[0x100] = {
	0x9db30420, 0x1fb6e9de, 0xa7be7bef, 0xd273a298,
	0x4a4f7bdb, 0x64ad8c57, 0x85510443, 0xfa020ed1,
	0x7e287aff, 0xe60fb663, 0x095f35a1, 0x79ebf120,
	0xfd059d43, 0x6497b7b1, 0xf3641f63, 0x241e4adf,
	0x28147f5f, 0x4fa2b8cd, 0xc9430040, 0x0cc32220,
	0xfdd30b30, 0xc0a5374f, 0x1d2d00d9, 0x24147b15,
	0xee4d111a, 0x0fca5167, 0x71ff904c, 0x2d195ffe,
	0x1a05645f, 0x0c13fefe, 0x081b08ca, 0x05170121,
	0x80530100, 0xe83e5efe, 0xac9af4f8, 0x7fe72701,
	0xd2b8ee5f, 0x06df4261, 0xbb9e9b8a, 0x7293ea25,
	0xce84ffdf, 0xf5718801, 0x3dd64b04, 0xa26f263b,
	0x7ed48400, 0x547eebe6, 0x446d4ca0, 0x6cf3d6f5,
	0x2649abdf, 0xaea0c7f5, 0x36338cc1, 0x503f7e93,
	0xd3772061, 0x11b638e1, 0x72500e03, 0xf80eb2bb,
	0xabe0502e, 0xec8d77de, 0x57971e81, 0xe14f6746,
	0xc9335400, 0x6920318f, 0x081dbb99, 0xffc304a5,
	0x4d351805, 0x7f3d5ce3, 0xa6c866c6, 0x5d5bcca9,
	0xdaec6fea, 0x9f926f91, 0x9f46222f, 0x3991467d,
	0xa5bf6d8e, 0x1143c44f, 0x43958302, 0xd0214eeb,
	0x022083b8, 0x3fb6180c, 0x18f8931e, 0x281658e6,
	0x26486e3e, 0x8bd78a70, 0x7477e4c1, 0xb506e07c,
	0xf32d0a25, 0x79098b02, 0xe4eabb81, 0x28123b23,
	0x69dead38, 0x1574ca16, 0xdf871b62, 0x211c40b7,
	0xa51a9ef9, 0x0014377b, 0x041e8ac8, 0x09114003,
	0xbd59e4d2, 0xe3d156d5, 0x4fe876d5, 0x2f91a340,
	0x557be8de, 0x00eae4a7, 0x0ce5c2ec, 0x4db4bba6,
	0xe756bdff, 0xdd3369ac, 0xec17b035, 0x06572327,
	0x99afc8b0, 0x56c8c391, 0x6b65811c, 0x5e146119,
	0x6e85cb75, 0xbe07c002, 0xc2325577, 0x893ff4ec,
	0x5bbfc92d, 0xd0ec3b25, 0xb7801ab7, 0x8d6d3b24,
	0x20c763ef, 0xc366a5fc, 0x9c382880, 0x0ace3205,
	0xaac9548a, 0xeca1d7c7, 0x041afa32, 0x1d16625a,
	0x6701902c, 0x9b757a54, 0x31d477f7, 0x9126b031,
	0x36cc6fdb, 0xc70b8b46, 0xd9e66a48, 0x56e55a79,
	0x026a4ceb, 0x52437eff, 0x2f8f76b4, 0x0df980a5,
	0x8674cde3, 0xedda04eb, 0x17a9be04, 0x2c18f4df,
	0xb7747f9d, 0xab2af7b4, 0xefc34d20, 0x2e096b7c,
	0x1741a254, 0xe5b6a035, 0x213d42f6, 0x2c1c7c26,
	0x61c2f50f, 0x6552daf9, 0xd2c231f8, 0x25130f69,
	0xd8167fa2, 0x0418f2c8, 0x001a96a6, 0x0d1526ab,
	0x63315c21, 0x5e0a72ec, 0x49bafefd, 0x187908d9,
	0x8d0dbd86, 0x311170a7, 0x3e9b640c, 0xcc3e10d7,
	0xd5cad3b6, 0x0caec388, 0xf73001e1, 0x6c728aff,
	0x71eae2a1, 0x1f9af36e, 0xcfcbd12f, 0xc1de8417,
	0xac07be6b, 0xcb44a1d8, 0x8b9b0f56, 0x013988c3,
	0xb1c52fca, 0xb4be31cd, 0xd8782806, 0x12a3a4e2,
	0x6f7de532, 0x58fd7eb6, 0xd01ee900, 0x24adffc2,
	0xf4990fc5, 0x9711aac5, 0x001d7b95, 0x82e5e7d2,
	0x109873f6, 0x00613096, 0xc32d9521, 0xada121ff,
	0x29908415, 0x7fbb977f, 0xaf9eb3db, 0x29c9ed2a,
	0x5ce2a465, 0xa730f32c, 0xd0aa3fe8, 0x8a5cc091,
	0xd49e2ce7, 0x0ce454a9, 0xd60acd86, 0x015f1919,
	0x77079103, 0xdea03af6, 0x78a8565e, 0xdee356df,
	0x21f05cbe, 0x8b75e387, 0xb3c50651, 0xb8a5c3ef,
	0xd8eeb6d2, 0xe523be77, 0xc2154529, 0x2f69efdf,
	0xafe67afb, 0xf470c4b2, 0xf3e0eb5b, 0xd6cc9876,
	0x39e4460c, 0x1fda8538, 0x1987832f, 0xca007367,
	0xa99144f8, 0x296b299e, 0x492fc295, 0x9266beab,
	0xb5676e69, 0x9bd3ddda, 0xdf7e052f, 0xdb25701c,
	0x1b5e51ee, 0xf65324e6, 0x6afce36c, 0x0316cc04,
	0x8644213e, 0xb7dc59d0, 0x7965291f, 0xccd6fd43,
	0x41823979, 0x932bcdf6, 0xb657c34d, 0x4edfd282,
	0x7ae5290c, 0x3cb9536b, 0x851e20fe, 0x9833557e,
	0x13ecf0b0, 0xd3ffb372, 0x3f85c5c1, 0x0aef7ed2
};

/* generated by 'make cast6_tables.h' */
const uint32_t Tm[24][8] = {
    {	0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c,
	0x15ea281d, 0x84c413be, 0xf39dff5f, 0x6277eb00  },
    {	0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984,
	0x8cb98525, 0xfb9370c6, 0x6a6d5c67, 0xd9474808  },
    {	0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c,
	0x0388e22d, 0x7262cdce, 0xe13cb96f, 0x5016a510  },
    {	0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394,
	0x7a583f35, 0xe9322ad6, 0x580c1677, 0xc6e60218  },
    {	0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c,
	0xf1279c3d, 0x600187de, 0xcedb737f, 0x3db55f20  },
    {	0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4,
	0x67f6f945, 0xd6d0e4e6, 0x45aad087, 0xb484bc28  },
    {	0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac,
	0xdec6564d, 0x4da041ee, 0xbc7a2d8f, 0x2b541930  },
    {	0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4,
	0x5595b355, 0xc46f9ef6, 0x33498a97, 0xa2237638  },
    {	0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc,
	0xcc65105d, 0x3b3efbfe, 0xaa18e79f, 0x18f2d340  },
    {	0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4,
	0x43346d65, 0xb20e5906, 0x20e844a7, 0x8fc23048  },
    {	0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc,
	0xba03ca6d, 0x28ddb60e, 0x97b7a1af, 0x06918d50  },
    {	0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4,
	0x30d32775, 0x9fad1316, 0x0e86feb7, 0x7d60ea58  },
    {	0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc,
	0xa7a2847d, 0x167c701e, 0x85565bbf, 0xf4304760  },
    {	0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4,
	0x1e71e185, 0x8d4bcd26, 0xfc25b8c7, 0x6affa468  },
    {	0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec,
	0x95413e8d, 0x041b2a2e, 0x72f515cf, 0xe1cf0170  },
    {	0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4,
	0x0c109b95, 0x7aea8736, 0xe9c472d7, 0x589e5e78  },
    {	0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc,
	0x82dff89d, 0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80  },
    {	0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04,
	0xf9af55a5, 0x68894146, 0xd7632ce7, 0x463d1888  },
    {	0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c,
	0x707eb2ad, 0xdf589e4e, 0x4e3289ef, 0xbd0c7590  },
    {	0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414,
	0xe74e0fb5, 0x5627fb56, 0xc501e6f7, 0x33dbd298  },
    {	0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c,
	0x5e1d6cbd, 0xccf7585e, 0x3bd143ff, 0xaaab2fa0  },
    {	0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24,
	0xd4ecc9c5, 0x43c6b566, 0xb2a0a107, 0x217a8ca8  },
    {	0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c,
	0x4bbc26cd, 0xba96126e, 0x296ffe0f, 0x9849e9b0  },
    {	0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834,
	0xc28b83d5, 0x31656f76, 0xa03f5b17, 0x0f1946b8  }
};

/* generated by 'make cast6_tables.h'; the values in Tr as defined
 * repeat, so only the first four rows are here */
const uint8_t Tr[4][8] = {
    {	0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a  },
    {	0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12  },
    {	0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a  },
    {	0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02  }
};

static inline uint32_t
f1(uint32_t d, uint8_t kr, uint32_t km)
{
	uint32_t i = ROL(km + d, kr);
	return ((
	    sbox1[         (i >> 24)]  ^
	    sbox2[(uint8_t)(i >> 16)]) -
	    sbox3[(uint8_t)(i >> 8 )]) +
	    sbox4[(uint8_t)(i      )];
}

static inline uint32_t
f2(uint32_t d, uint8_t kr, uint32_t km)
{
	uint32_t i = ROL(km ^ d, kr);
	return ((
	    sbox1[         (i >> 24)]  -
	    sbox2[(uint8_t)(i >> 16)]) +
	    sbox3[(uint8_t)(i >> 8 )]) ^
	    sbox4[(uint8_t)(i      )];
}

static inline uint32_t
f3(uint32_t d, uint8_t kr, uint32_t km)
{
	uint32_t i = ROL(km - d, kr);
	return ((
	    sbox1[         (i >> 24)]  +
	    sbox2[(uint8_t)(i >> 16)]) ^
	    sbox3[(uint8_t)(i >> 8 )]) -
	    sbox4[(uint8_t)(i      )];
}

/* BETA <- Qi(BETA) 'forward quad round'; if I end up C++ifying this, it
 * will be
 *
 *inline void
 *beta_q(uint32_t &b0, uint32_t &b1, uint32_t &b2, uint32_t &b3,
 *    const uint8_t kr[4], const uint32_t km[4]) */
#define beta_q(b0,b1,b2,b3, kr, km)				do \
{								\
	b2 ^= f1(b3, kr[0], km[0]);				\
	b1 ^= f2(b2, kr[1], km[1]);				\
	b0 ^= f3(b1, kr[2], km[2]);				\
	b3 ^= f1(b0, kr[3], km[3]);				\
	ADD_IV(kr, km);						\
}								while(0)

/* BETA <- QBARi(BETA) 'reverse quad round'; if I end up C++ifying this, it
 * will be
 *
 *beta_qbar(uint32_t &b0, uint32_t &b1, uint32_t &b2, uint32_t &b3,
 *    const uint8_t kr[4], const uint32_t km[4]) */
#define beta_qbar(b0,b1,b2,b3, kr, km)				do \
{								\
	b3 ^= f1(b0, kr[3], km[3]);				\
	b0 ^= f3(b1, kr[2], km[2]);				\
	b1 ^= f2(b2, kr[1], km[1]);				\
	b2 ^= f1(b3, kr[0], km[0]);				\
	ADD_IV(kr, km);						\
}								while(0)

/* KAPPA <- Wi(KAPPA) 'forward octave' */
static inline void
kappa_w(uint32_t kappa[8], uint8_t i)
{
	assert(i < 24);
	uint8_t ir = i & 0x3;
	kappa[6] ^= f1(kappa[7], Tr[ir][0], Tm[i][0]);
	kappa[5] ^= f2(kappa[6], Tr[ir][1], Tm[i][1]);
	kappa[4] ^= f3(kappa[5], Tr[ir][2], Tm[i][2]);
	kappa[3] ^= f1(kappa[4], Tr[ir][3], Tm[i][3]);
	kappa[2] ^= f2(kappa[3], Tr[ir][4], Tm[i][4]);
	kappa[1] ^= f3(kappa[2], Tr[ir][5], Tm[i][5]);
	kappa[0] ^= f1(kappa[1], Tr[ir][6], Tm[i][6]);
	kappa[7] ^= f2(kappa[0], Tr[ir][7], Tm[i][7]);
}

/* Kr_(i) <- KAPPA; (k)ey (r)otation */
static inline void
kappa_kr(uint8_t kr[4], const uint32_t kappa[8])
{
	kr[0] = kappa[0] & 0x1f;
	kr[1] = kappa[2] & 0x1f;
	kr[2] = kappa[4] & 0x1f;
	kr[3] = kappa[6] & 0x1f;
}

/* Km_(i) <- KAPPA; (k)ey (m)aterial */
static inline void
kappa_km(uint32_t km[4], const uint32_t kappa[8])
{
	km[0] = kappa[7];
	km[1] = kappa[5];
	km[2] = kappa[3];
	km[3] = kappa[1];
}

void
cast6_encrypt(const struct cast6_ctx *ctx,
    const uint8_t plaintext[16], uint8_t ciphertext[16])
{
	uint32_t block[4];
	uint32_t b0, b1, b2, b3;

	/* copy to a 32-bit block, fixing any potential alignment or endian
	 * issues */
	be32toh_buf(block, plaintext, 16);
	b0 = block[0];
	b1 = block[1];
	b2 = block[2];
	b3 = block[3];

	INIT_IV();
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 0], ctx->Km[ 0]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 1], ctx->Km[ 1]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 2], ctx->Km[ 2]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 3], ctx->Km[ 3]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 4], ctx->Km[ 4]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 5], ctx->Km[ 5]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 6], ctx->Km[ 6]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 7], ctx->Km[ 7]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 8], ctx->Km[ 8]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 9], ctx->Km[ 9]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[10], ctx->Km[10]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[11], ctx->Km[11]);

	block[0] = b0;
	block[1] = b1;
	block[2] = b2;
	block[3] = b3;
	htobe32_buf(ciphertext, block, 16);
}

void
cast6_decrypt(const struct cast6_ctx *ctx,
    const uint8_t ciphertext[16], uint8_t plaintext[16])
{
	uint32_t block[4];
	uint32_t b0, b1, b2, b3;

	/* copy to a 32-bit block, fixing any potential alignment or endian
	 * issues */
	be32toh_buf(block, ciphertext, 16);
	b0 = block[0];
	b1 = block[1];
	b2 = block[2];
	b3 = block[3];

	INIT_IV();
	beta_q(b0,b1,b2,b3,	ctx->Kr[11], ctx->Km[11]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[10], ctx->Km[10]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 9], ctx->Km[ 9]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 8], ctx->Km[ 8]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 7], ctx->Km[ 7]);
	beta_q(b0,b1,b2,b3,	ctx->Kr[ 6], ctx->Km[ 6]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 5], ctx->Km[ 5]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 4], ctx->Km[ 4]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 3], ctx->Km[ 3]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 2], ctx->Km[ 2]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 1], ctx->Km[ 1]);
	beta_qbar(b0,b1,b2,b3,	ctx->Kr[ 0], ctx->Km[ 0]);

	block[0] = b0;
	block[1] = b1;
	block[2] = b2;
	block[3] = b3;
	htobe32_buf(plaintext, block, 16);
}

#ifdef GEN_TABLES
/* generate tables and write to stdout; these tables are as defined in
 * (RFC 2612, 2.4, Initialization); the resulting values were copied into
 * this file above; to regenerate, use 'make cast6_tables.h' */
void
gen_tables()
{
	/* 2^30 sqrt(2) */
	uint32_t Cm = 0x5a827999;
	/* 2^30 sqrt(3) */
	uint32_t Mm = 0x6ed9eba1;

	uint8_t Cr = 19;
	uint8_t Mr = 17;

	const uint8_t T_ROWS = 24;
	const uint8_t T_COLS = 8;
	uint32_t Tm[T_ROWS][T_COLS];
	uint8_t Tr[T_ROWS][T_COLS];

	for (uint8_t i = 0; i < T_ROWS; i++)
		for (uint8_t j = 0; j < T_COLS; j++) {
			Tm[i][j] = Cm;
			Cm += Mm;
			Tr[i][j] = Cr;
			Cr = (Cr + Mr) & 0x1f;
		}

	/* write tables to stdout */

	printf("#include <stdint.h>\n\n"
	    "const uint32_t Tm[%hhu][%hhu] = {", T_ROWS, T_COLS);
	for (uint8_t i = 0; i < T_ROWS; i++) {
		printf("%s\n    {",
		    !i ?
			"" : /* first line */
			","); /* else */
		for (uint8_t j = 0; j < T_COLS; j++)
			printf("%s0x%08x",
			    !j ?
				"\t" : /* first value */
			    j == 4 ?
				",\n\t" : /* fifth value */
				", ", /* else */
			    Tm[i][j]);
		printf("  }");
	}

	printf("\n};\n\nconst uint8_t Tr[%hhu][%hhu] = {", T_ROWS, T_COLS);
	for (uint8_t i = 0; i < T_ROWS; i++) {
		printf("%s\n    {",
		    !i ?
			"," : /* first line */
			""); /* else */
		for (uint8_t j = 0; j < T_COLS; j++)
			printf("%s0x%02hhx",
			    !j ?
				"\t" : /* first value */
				", ", /* else */
			    Tr[i][j]);
		printf("  }");
	}
	printf("\n};\n");
}

int main()
{
	gen_tables();
	return 0;
}
#endif

bool
cast6_init(struct cast6_ctx *ctx, const uint8_t *key, uint8_t sz)
{
	uint32_t kappa[8];

	if (sz & 0x3 || sz < 16 || sz > 32)
		return false;

	/* sizes are multiples of 4, so this works fine:
	 * copy key (switching endian) into kappa, then fill rest with 0 */
	be32toh_buf(kappa, key, sz);
	if (sz < 32) memset(kappa + sz/4, 0, 32 - sz);

	for (uint8_t i = 0; i < 12; i++) {
		kappa_w(kappa, 2 * i);
		kappa_w(kappa, 2 * i + 1);

		kappa_kr(ctx->Kr[i], kappa);
		kappa_km(ctx->Km[i], kappa);
	}
	return true;
}