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des_generic.c

/*
 * Cryptographic API.
 *
 * DES & Triple DES EDE Cipher Algorithms.
 *
 * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <asm/byteorder.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/crypto.h>
#include <linux/types.h>

#define DES_KEY_SIZE          8
#define DES_EXPKEY_WORDS      32
#define DES_BLOCK_SIZE        8

#define DES3_EDE_KEY_SIZE     (3 * DES_KEY_SIZE)
#define DES3_EDE_EXPKEY_WORDS (3 * DES_EXPKEY_WORDS)
#define DES3_EDE_BLOCK_SIZE   DES_BLOCK_SIZE

#define ROL(x, r) ((x) = rol32((x), (r)))
#define ROR(x, r) ((x) = ror32((x), (r)))

struct des_ctx {
      u32 expkey[DES_EXPKEY_WORDS];
};

struct des3_ede_ctx {
      u32 expkey[DES3_EDE_EXPKEY_WORDS];
};

/* Lookup tables for key expansion */

static const u8 pc1[256] = {
      0x00, 0x00, 0x40, 0x04, 0x10, 0x10, 0x50, 0x14,
      0x04, 0x40, 0x44, 0x44, 0x14, 0x50, 0x54, 0x54,
      0x02, 0x02, 0x42, 0x06, 0x12, 0x12, 0x52, 0x16,
      0x06, 0x42, 0x46, 0x46, 0x16, 0x52, 0x56, 0x56,
      0x80, 0x08, 0xc0, 0x0c, 0x90, 0x18, 0xd0, 0x1c,
      0x84, 0x48, 0xc4, 0x4c, 0x94, 0x58, 0xd4, 0x5c,
      0x82, 0x0a, 0xc2, 0x0e, 0x92, 0x1a, 0xd2, 0x1e,
      0x86, 0x4a, 0xc6, 0x4e, 0x96, 0x5a, 0xd6, 0x5e,
      0x20, 0x20, 0x60, 0x24, 0x30, 0x30, 0x70, 0x34,
      0x24, 0x60, 0x64, 0x64, 0x34, 0x70, 0x74, 0x74,
      0x22, 0x22, 0x62, 0x26, 0x32, 0x32, 0x72, 0x36,
      0x26, 0x62, 0x66, 0x66, 0x36, 0x72, 0x76, 0x76,
      0xa0, 0x28, 0xe0, 0x2c, 0xb0, 0x38, 0xf0, 0x3c,
      0xa4, 0x68, 0xe4, 0x6c, 0xb4, 0x78, 0xf4, 0x7c,
      0xa2, 0x2a, 0xe2, 0x2e, 0xb2, 0x3a, 0xf2, 0x3e,
      0xa6, 0x6a, 0xe6, 0x6e, 0xb6, 0x7a, 0xf6, 0x7e,
      0x08, 0x80, 0x48, 0x84, 0x18, 0x90, 0x58, 0x94,
      0x0c, 0xc0, 0x4c, 0xc4, 0x1c, 0xd0, 0x5c, 0xd4,
      0x0a, 0x82, 0x4a, 0x86, 0x1a, 0x92, 0x5a, 0x96,
      0x0e, 0xc2, 0x4e, 0xc6, 0x1e, 0xd2, 0x5e, 0xd6,
      0x88, 0x88, 0xc8, 0x8c, 0x98, 0x98, 0xd8, 0x9c,
      0x8c, 0xc8, 0xcc, 0xcc, 0x9c, 0xd8, 0xdc, 0xdc,
      0x8a, 0x8a, 0xca, 0x8e, 0x9a, 0x9a, 0xda, 0x9e,
      0x8e, 0xca, 0xce, 0xce, 0x9e, 0xda, 0xde, 0xde,
      0x28, 0xa0, 0x68, 0xa4, 0x38, 0xb0, 0x78, 0xb4,
      0x2c, 0xe0, 0x6c, 0xe4, 0x3c, 0xf0, 0x7c, 0xf4,
      0x2a, 0xa2, 0x6a, 0xa6, 0x3a, 0xb2, 0x7a, 0xb6,
      0x2e, 0xe2, 0x6e, 0xe6, 0x3e, 0xf2, 0x7e, 0xf6,
      0xa8, 0xa8, 0xe8, 0xac, 0xb8, 0xb8, 0xf8, 0xbc,
      0xac, 0xe8, 0xec, 0xec, 0xbc, 0xf8, 0xfc, 0xfc,
      0xaa, 0xaa, 0xea, 0xae, 0xba, 0xba, 0xfa, 0xbe,
      0xae, 0xea, 0xee, 0xee, 0xbe, 0xfa, 0xfe, 0xfe
};

static const u8 rs[256] = {
      0x00, 0x00, 0x80, 0x80, 0x02, 0x02, 0x82, 0x82,
      0x04, 0x04, 0x84, 0x84, 0x06, 0x06, 0x86, 0x86,
      0x08, 0x08, 0x88, 0x88, 0x0a, 0x0a, 0x8a, 0x8a,
      0x0c, 0x0c, 0x8c, 0x8c, 0x0e, 0x0e, 0x8e, 0x8e,
      0x10, 0x10, 0x90, 0x90, 0x12, 0x12, 0x92, 0x92,
      0x14, 0x14, 0x94, 0x94, 0x16, 0x16, 0x96, 0x96,
      0x18, 0x18, 0x98, 0x98, 0x1a, 0x1a, 0x9a, 0x9a,
      0x1c, 0x1c, 0x9c, 0x9c, 0x1e, 0x1e, 0x9e, 0x9e,
      0x20, 0x20, 0xa0, 0xa0, 0x22, 0x22, 0xa2, 0xa2,
      0x24, 0x24, 0xa4, 0xa4, 0x26, 0x26, 0xa6, 0xa6,
      0x28, 0x28, 0xa8, 0xa8, 0x2a, 0x2a, 0xaa, 0xaa,
      0x2c, 0x2c, 0xac, 0xac, 0x2e, 0x2e, 0xae, 0xae,
      0x30, 0x30, 0xb0, 0xb0, 0x32, 0x32, 0xb2, 0xb2,
      0x34, 0x34, 0xb4, 0xb4, 0x36, 0x36, 0xb6, 0xb6,
      0x38, 0x38, 0xb8, 0xb8, 0x3a, 0x3a, 0xba, 0xba,
      0x3c, 0x3c, 0xbc, 0xbc, 0x3e, 0x3e, 0xbe, 0xbe,
      0x40, 0x40, 0xc0, 0xc0, 0x42, 0x42, 0xc2, 0xc2,
      0x44, 0x44, 0xc4, 0xc4, 0x46, 0x46, 0xc6, 0xc6,
      0x48, 0x48, 0xc8, 0xc8, 0x4a, 0x4a, 0xca, 0xca,
      0x4c, 0x4c, 0xcc, 0xcc, 0x4e, 0x4e, 0xce, 0xce,
      0x50, 0x50, 0xd0, 0xd0, 0x52, 0x52, 0xd2, 0xd2,
      0x54, 0x54, 0xd4, 0xd4, 0x56, 0x56, 0xd6, 0xd6,
      0x58, 0x58, 0xd8, 0xd8, 0x5a, 0x5a, 0xda, 0xda,
      0x5c, 0x5c, 0xdc, 0xdc, 0x5e, 0x5e, 0xde, 0xde,
      0x60, 0x60, 0xe0, 0xe0, 0x62, 0x62, 0xe2, 0xe2,
      0x64, 0x64, 0xe4, 0xe4, 0x66, 0x66, 0xe6, 0xe6,
      0x68, 0x68, 0xe8, 0xe8, 0x6a, 0x6a, 0xea, 0xea,
      0x6c, 0x6c, 0xec, 0xec, 0x6e, 0x6e, 0xee, 0xee,
      0x70, 0x70, 0xf0, 0xf0, 0x72, 0x72, 0xf2, 0xf2,
      0x74, 0x74, 0xf4, 0xf4, 0x76, 0x76, 0xf6, 0xf6,
      0x78, 0x78, 0xf8, 0xf8, 0x7a, 0x7a, 0xfa, 0xfa,
      0x7c, 0x7c, 0xfc, 0xfc, 0x7e, 0x7e, 0xfe, 0xfe
};

static const u32 pc2[1024] = {
      0x00000000, 0x00000000, 0x00000000, 0x00000000,
      0x00040000, 0x00000000, 0x04000000, 0x00100000,
      0x00400000, 0x00000008, 0x00000800, 0x40000000,
      0x00440000, 0x00000008, 0x04000800, 0x40100000,
      0x00000400, 0x00000020, 0x08000000, 0x00000100,
      0x00040400, 0x00000020, 0x0c000000, 0x00100100,
      0x00400400, 0x00000028, 0x08000800, 0x40000100,
      0x00440400, 0x00000028, 0x0c000800, 0x40100100,
      0x80000000, 0x00000010, 0x00000000, 0x00800000,
      0x80040000, 0x00000010, 0x04000000, 0x00900000,
      0x80400000, 0x00000018, 0x00000800, 0x40800000,
      0x80440000, 0x00000018, 0x04000800, 0x40900000,
      0x80000400, 0x00000030, 0x08000000, 0x00800100,
      0x80040400, 0x00000030, 0x0c000000, 0x00900100,
      0x80400400, 0x00000038, 0x08000800, 0x40800100,
      0x80440400, 0x00000038, 0x0c000800, 0x40900100,
      0x10000000, 0x00000000, 0x00200000, 0x00001000,
      0x10040000, 0x00000000, 0x04200000, 0x00101000,
      0x10400000, 0x00000008, 0x00200800, 0x40001000,
      0x10440000, 0x00000008, 0x04200800, 0x40101000,
      0x10000400, 0x00000020, 0x08200000, 0x00001100,
      0x10040400, 0x00000020, 0x0c200000, 0x00101100,
      0x10400400, 0x00000028, 0x08200800, 0x40001100,
      0x10440400, 0x00000028, 0x0c200800, 0x40101100,
      0x90000000, 0x00000010, 0x00200000, 0x00801000,
      0x90040000, 0x00000010, 0x04200000, 0x00901000,
      0x90400000, 0x00000018, 0x00200800, 0x40801000,
      0x90440000, 0x00000018, 0x04200800, 0x40901000,
      0x90000400, 0x00000030, 0x08200000, 0x00801100,
      0x90040400, 0x00000030, 0x0c200000, 0x00901100,
      0x90400400, 0x00000038, 0x08200800, 0x40801100,
      0x90440400, 0x00000038, 0x0c200800, 0x40901100,
      0x00000200, 0x00080000, 0x00000000, 0x00000004,
      0x00040200, 0x00080000, 0x04000000, 0x00100004,
      0x00400200, 0x00080008, 0x00000800, 0x40000004,
      0x00440200, 0x00080008, 0x04000800, 0x40100004,
      0x00000600, 0x00080020, 0x08000000, 0x00000104,
      0x00040600, 0x00080020, 0x0c000000, 0x00100104,
      0x00400600, 0x00080028, 0x08000800, 0x40000104,
      0x00440600, 0x00080028, 0x0c000800, 0x40100104,
      0x80000200, 0x00080010, 0x00000000, 0x00800004,
      0x80040200, 0x00080010, 0x04000000, 0x00900004,
      0x80400200, 0x00080018, 0x00000800, 0x40800004,
      0x80440200, 0x00080018, 0x04000800, 0x40900004,
      0x80000600, 0x00080030, 0x08000000, 0x00800104,
      0x80040600, 0x00080030, 0x0c000000, 0x00900104,
      0x80400600, 0x00080038, 0x08000800, 0x40800104,
      0x80440600, 0x00080038, 0x0c000800, 0x40900104,
      0x10000200, 0x00080000, 0x00200000, 0x00001004,
      0x10040200, 0x00080000, 0x04200000, 0x00101004,
      0x10400200, 0x00080008, 0x00200800, 0x40001004,
      0x10440200, 0x00080008, 0x04200800, 0x40101004,
      0x10000600, 0x00080020, 0x08200000, 0x00001104,
      0x10040600, 0x00080020, 0x0c200000, 0x00101104,
      0x10400600, 0x00080028, 0x08200800, 0x40001104,
      0x10440600, 0x00080028, 0x0c200800, 0x40101104,
      0x90000200, 0x00080010, 0x00200000, 0x00801004,
      0x90040200, 0x00080010, 0x04200000, 0x00901004,
      0x90400200, 0x00080018, 0x00200800, 0x40801004,
      0x90440200, 0x00080018, 0x04200800, 0x40901004,
      0x90000600, 0x00080030, 0x08200000, 0x00801104,
      0x90040600, 0x00080030, 0x0c200000, 0x00901104,
      0x90400600, 0x00080038, 0x08200800, 0x40801104,
      0x90440600, 0x00080038, 0x0c200800, 0x40901104,
      0x00000002, 0x00002000, 0x20000000, 0x00000001,
      0x00040002, 0x00002000, 0x24000000, 0x00100001,
      0x00400002, 0x00002008, 0x20000800, 0x40000001,
      0x00440002, 0x00002008, 0x24000800, 0x40100001,
      0x00000402, 0x00002020, 0x28000000, 0x00000101,
      0x00040402, 0x00002020, 0x2c000000, 0x00100101,
      0x00400402, 0x00002028, 0x28000800, 0x40000101,
      0x00440402, 0x00002028, 0x2c000800, 0x40100101,
      0x80000002, 0x00002010, 0x20000000, 0x00800001,
      0x80040002, 0x00002010, 0x24000000, 0x00900001,
      0x80400002, 0x00002018, 0x20000800, 0x40800001,
      0x80440002, 0x00002018, 0x24000800, 0x40900001,
      0x80000402, 0x00002030, 0x28000000, 0x00800101,
      0x80040402, 0x00002030, 0x2c000000, 0x00900101,
      0x80400402, 0x00002038, 0x28000800, 0x40800101,
      0x80440402, 0x00002038, 0x2c000800, 0x40900101,
      0x10000002, 0x00002000, 0x20200000, 0x00001001,
      0x10040002, 0x00002000, 0x24200000, 0x00101001,
      0x10400002, 0x00002008, 0x20200800, 0x40001001,
      0x10440002, 0x00002008, 0x24200800, 0x40101001,
      0x10000402, 0x00002020, 0x28200000, 0x00001101,
      0x10040402, 0x00002020, 0x2c200000, 0x00101101,
      0x10400402, 0x00002028, 0x28200800, 0x40001101,
      0x10440402, 0x00002028, 0x2c200800, 0x40101101,
      0x90000002, 0x00002010, 0x20200000, 0x00801001,
      0x90040002, 0x00002010, 0x24200000, 0x00901001,
      0x90400002, 0x00002018, 0x20200800, 0x40801001,
      0x90440002, 0x00002018, 0x24200800, 0x40901001,
      0x90000402, 0x00002030, 0x28200000, 0x00801101,
      0x90040402, 0x00002030, 0x2c200000, 0x00901101,
      0x90400402, 0x00002038, 0x28200800, 0x40801101,
      0x90440402, 0x00002038, 0x2c200800, 0x40901101,
      0x00000202, 0x00082000, 0x20000000, 0x00000005,
      0x00040202, 0x00082000, 0x24000000, 0x00100005,
      0x00400202, 0x00082008, 0x20000800, 0x40000005,
      0x00440202, 0x00082008, 0x24000800, 0x40100005,
      0x00000602, 0x00082020, 0x28000000, 0x00000105,
      0x00040602, 0x00082020, 0x2c000000, 0x00100105,
      0x00400602, 0x00082028, 0x28000800, 0x40000105,
      0x00440602, 0x00082028, 0x2c000800, 0x40100105,
      0x80000202, 0x00082010, 0x20000000, 0x00800005,
      0x80040202, 0x00082010, 0x24000000, 0x00900005,
      0x80400202, 0x00082018, 0x20000800, 0x40800005,
      0x80440202, 0x00082018, 0x24000800, 0x40900005,
      0x80000602, 0x00082030, 0x28000000, 0x00800105,
      0x80040602, 0x00082030, 0x2c000000, 0x00900105,
      0x80400602, 0x00082038, 0x28000800, 0x40800105,
      0x80440602, 0x00082038, 0x2c000800, 0x40900105,
      0x10000202, 0x00082000, 0x20200000, 0x00001005,
      0x10040202, 0x00082000, 0x24200000, 0x00101005,
      0x10400202, 0x00082008, 0x20200800, 0x40001005,
      0x10440202, 0x00082008, 0x24200800, 0x40101005,
      0x10000602, 0x00082020, 0x28200000, 0x00001105,
      0x10040602, 0x00082020, 0x2c200000, 0x00101105,
      0x10400602, 0x00082028, 0x28200800, 0x40001105,
      0x10440602, 0x00082028, 0x2c200800, 0x40101105,
      0x90000202, 0x00082010, 0x20200000, 0x00801005,
      0x90040202, 0x00082010, 0x24200000, 0x00901005,
      0x90400202, 0x00082018, 0x20200800, 0x40801005,
      0x90440202, 0x00082018, 0x24200800, 0x40901005,
      0x90000602, 0x00082030, 0x28200000, 0x00801105,
      0x90040602, 0x00082030, 0x2c200000, 0x00901105,
      0x90400602, 0x00082038, 0x28200800, 0x40801105,
      0x90440602, 0x00082038, 0x2c200800, 0x40901105,

      0x00000000, 0x00000000, 0x00000000, 0x00000000,
      0x00000000, 0x00000008, 0x00080000, 0x10000000,
      0x02000000, 0x00000000, 0x00000080, 0x00001000,
      0x02000000, 0x00000008, 0x00080080, 0x10001000,
      0x00004000, 0x00000000, 0x00000040, 0x00040000,
      0x00004000, 0x00000008, 0x00080040, 0x10040000,
      0x02004000, 0x00000000, 0x000000c0, 0x00041000,
      0x02004000, 0x00000008, 0x000800c0, 0x10041000,
      0x00020000, 0x00008000, 0x08000000, 0x00200000,
      0x00020000, 0x00008008, 0x08080000, 0x10200000,
      0x02020000, 0x00008000, 0x08000080, 0x00201000,
      0x02020000, 0x00008008, 0x08080080, 0x10201000,
      0x00024000, 0x00008000, 0x08000040, 0x00240000,
      0x00024000, 0x00008008, 0x08080040, 0x10240000,
      0x02024000, 0x00008000, 0x080000c0, 0x00241000,
      0x02024000, 0x00008008, 0x080800c0, 0x10241000,
      0x00000000, 0x01000000, 0x00002000, 0x00000020,
      0x00000000, 0x01000008, 0x00082000, 0x10000020,
      0x02000000, 0x01000000, 0x00002080, 0x00001020,
      0x02000000, 0x01000008, 0x00082080, 0x10001020,
      0x00004000, 0x01000000, 0x00002040, 0x00040020,
      0x00004000, 0x01000008, 0x00082040, 0x10040020,
      0x02004000, 0x01000000, 0x000020c0, 0x00041020,
      0x02004000, 0x01000008, 0x000820c0, 0x10041020,
      0x00020000, 0x01008000, 0x08002000, 0x00200020,
      0x00020000, 0x01008008, 0x08082000, 0x10200020,
      0x02020000, 0x01008000, 0x08002080, 0x00201020,
      0x02020000, 0x01008008, 0x08082080, 0x10201020,
      0x00024000, 0x01008000, 0x08002040, 0x00240020,
      0x00024000, 0x01008008, 0x08082040, 0x10240020,
      0x02024000, 0x01008000, 0x080020c0, 0x00241020,
      0x02024000, 0x01008008, 0x080820c0, 0x10241020,
      0x00000400, 0x04000000, 0x00100000, 0x00000004,
      0x00000400, 0x04000008, 0x00180000, 0x10000004,
      0x02000400, 0x04000000, 0x00100080, 0x00001004,
      0x02000400, 0x04000008, 0x00180080, 0x10001004,
      0x00004400, 0x04000000, 0x00100040, 0x00040004,
      0x00004400, 0x04000008, 0x00180040, 0x10040004,
      0x02004400, 0x04000000, 0x001000c0, 0x00041004,
      0x02004400, 0x04000008, 0x001800c0, 0x10041004,
      0x00020400, 0x04008000, 0x08100000, 0x00200004,
      0x00020400, 0x04008008, 0x08180000, 0x10200004,
      0x02020400, 0x04008000, 0x08100080, 0x00201004,
      0x02020400, 0x04008008, 0x08180080, 0x10201004,
      0x00024400, 0x04008000, 0x08100040, 0x00240004,
      0x00024400, 0x04008008, 0x08180040, 0x10240004,
      0x02024400, 0x04008000, 0x081000c0, 0x00241004,
      0x02024400, 0x04008008, 0x081800c0, 0x10241004,
      0x00000400, 0x05000000, 0x00102000, 0x00000024,
      0x00000400, 0x05000008, 0x00182000, 0x10000024,
      0x02000400, 0x05000000, 0x00102080, 0x00001024,
      0x02000400, 0x05000008, 0x00182080, 0x10001024,
      0x00004400, 0x05000000, 0x00102040, 0x00040024,
      0x00004400, 0x05000008, 0x00182040, 0x10040024,
      0x02004400, 0x05000000, 0x001020c0, 0x00041024,
      0x02004400, 0x05000008, 0x001820c0, 0x10041024,
      0x00020400, 0x05008000, 0x08102000, 0x00200024,
      0x00020400, 0x05008008, 0x08182000, 0x10200024,
      0x02020400, 0x05008000, 0x08102080, 0x00201024,
      0x02020400, 0x05008008, 0x08182080, 0x10201024,
      0x00024400, 0x05008000, 0x08102040, 0x00240024,
      0x00024400, 0x05008008, 0x08182040, 0x10240024,
      0x02024400, 0x05008000, 0x081020c0, 0x00241024,
      0x02024400, 0x05008008, 0x081820c0, 0x10241024,
      0x00000800, 0x00010000, 0x20000000, 0x00000010,
      0x00000800, 0x00010008, 0x20080000, 0x10000010,
      0x02000800, 0x00010000, 0x20000080, 0x00001010,
      0x02000800, 0x00010008, 0x20080080, 0x10001010,
      0x00004800, 0x00010000, 0x20000040, 0x00040010,
      0x00004800, 0x00010008, 0x20080040, 0x10040010,
      0x02004800, 0x00010000, 0x200000c0, 0x00041010,
      0x02004800, 0x00010008, 0x200800c0, 0x10041010,
      0x00020800, 0x00018000, 0x28000000, 0x00200010,
      0x00020800, 0x00018008, 0x28080000, 0x10200010,
      0x02020800, 0x00018000, 0x28000080, 0x00201010,
      0x02020800, 0x00018008, 0x28080080, 0x10201010,
      0x00024800, 0x00018000, 0x28000040, 0x00240010,
      0x00024800, 0x00018008, 0x28080040, 0x10240010,
      0x02024800, 0x00018000, 0x280000c0, 0x00241010,
      0x02024800, 0x00018008, 0x280800c0, 0x10241010,
      0x00000800, 0x01010000, 0x20002000, 0x00000030,
      0x00000800, 0x01010008, 0x20082000, 0x10000030,
      0x02000800, 0x01010000, 0x20002080, 0x00001030,
      0x02000800, 0x01010008, 0x20082080, 0x10001030,
      0x00004800, 0x01010000, 0x20002040, 0x00040030,
      0x00004800, 0x01010008, 0x20082040, 0x10040030,
      0x02004800, 0x01010000, 0x200020c0, 0x00041030,
      0x02004800, 0x01010008, 0x200820c0, 0x10041030,
      0x00020800, 0x01018000, 0x28002000, 0x00200030,
      0x00020800, 0x01018008, 0x28082000, 0x10200030,
      0x02020800, 0x01018000, 0x28002080, 0x00201030,
      0x02020800, 0x01018008, 0x28082080, 0x10201030,
      0x00024800, 0x01018000, 0x28002040, 0x00240030,
      0x00024800, 0x01018008, 0x28082040, 0x10240030,
      0x02024800, 0x01018000, 0x280020c0, 0x00241030,
      0x02024800, 0x01018008, 0x280820c0, 0x10241030,
      0x00000c00, 0x04010000, 0x20100000, 0x00000014,
      0x00000c00, 0x04010008, 0x20180000, 0x10000014,
      0x02000c00, 0x04010000, 0x20100080, 0x00001014,
      0x02000c00, 0x04010008, 0x20180080, 0x10001014,
      0x00004c00, 0x04010000, 0x20100040, 0x00040014,
      0x00004c00, 0x04010008, 0x20180040, 0x10040014,
      0x02004c00, 0x04010000, 0x201000c0, 0x00041014,
      0x02004c00, 0x04010008, 0x201800c0, 0x10041014,
      0x00020c00, 0x04018000, 0x28100000, 0x00200014,
      0x00020c00, 0x04018008, 0x28180000, 0x10200014,
      0x02020c00, 0x04018000, 0x28100080, 0x00201014,
      0x02020c00, 0x04018008, 0x28180080, 0x10201014,
      0x00024c00, 0x04018000, 0x28100040, 0x00240014,
      0x00024c00, 0x04018008, 0x28180040, 0x10240014,
      0x02024c00, 0x04018000, 0x281000c0, 0x00241014,
      0x02024c00, 0x04018008, 0x281800c0, 0x10241014,
      0x00000c00, 0x05010000, 0x20102000, 0x00000034,
      0x00000c00, 0x05010008, 0x20182000, 0x10000034,
      0x02000c00, 0x05010000, 0x20102080, 0x00001034,
      0x02000c00, 0x05010008, 0x20182080, 0x10001034,
      0x00004c00, 0x05010000, 0x20102040, 0x00040034,
      0x00004c00, 0x05010008, 0x20182040, 0x10040034,
      0x02004c00, 0x05010000, 0x201020c0, 0x00041034,
      0x02004c00, 0x05010008, 0x201820c0, 0x10041034,
      0x00020c00, 0x05018000, 0x28102000, 0x00200034,
      0x00020c00, 0x05018008, 0x28182000, 0x10200034,
      0x02020c00, 0x05018000, 0x28102080, 0x00201034,
      0x02020c00, 0x05018008, 0x28182080, 0x10201034,
      0x00024c00, 0x05018000, 0x28102040, 0x00240034,
      0x00024c00, 0x05018008, 0x28182040, 0x10240034,
      0x02024c00, 0x05018000, 0x281020c0, 0x00241034,
      0x02024c00, 0x05018008, 0x281820c0, 0x10241034
};

/* S-box lookup tables */

static const u32 S1[64] = {
      0x01010400, 0x00000000, 0x00010000, 0x01010404,
      0x01010004, 0x00010404, 0x00000004, 0x00010000,
      0x00000400, 0x01010400, 0x01010404, 0x00000400,
      0x01000404, 0x01010004, 0x01000000, 0x00000004,
      0x00000404, 0x01000400, 0x01000400, 0x00010400,
      0x00010400, 0x01010000, 0x01010000, 0x01000404,
      0x00010004, 0x01000004, 0x01000004, 0x00010004,
      0x00000000, 0x00000404, 0x00010404, 0x01000000,
      0x00010000, 0x01010404, 0x00000004, 0x01010000,
      0x01010400, 0x01000000, 0x01000000, 0x00000400,
      0x01010004, 0x00010000, 0x00010400, 0x01000004,
      0x00000400, 0x00000004, 0x01000404, 0x00010404,
      0x01010404, 0x00010004, 0x01010000, 0x01000404,
      0x01000004, 0x00000404, 0x00010404, 0x01010400,
      0x00000404, 0x01000400, 0x01000400, 0x00000000,
      0x00010004, 0x00010400, 0x00000000, 0x01010004
};

static const u32 S2[64] = {
      0x80108020, 0x80008000, 0x00008000, 0x00108020,
      0x00100000, 0x00000020, 0x80100020, 0x80008020,
      0x80000020, 0x80108020, 0x80108000, 0x80000000,
      0x80008000, 0x00100000, 0x00000020, 0x80100020,
      0x00108000, 0x00100020, 0x80008020, 0x00000000,
      0x80000000, 0x00008000, 0x00108020, 0x80100000,
      0x00100020, 0x80000020, 0x00000000, 0x00108000,
      0x00008020, 0x80108000, 0x80100000, 0x00008020,
      0x00000000, 0x00108020, 0x80100020, 0x00100000,
      0x80008020, 0x80100000, 0x80108000, 0x00008000,
      0x80100000, 0x80008000, 0x00000020, 0x80108020,
      0x00108020, 0x00000020, 0x00008000, 0x80000000,
      0x00008020, 0x80108000, 0x00100000, 0x80000020,
      0x00100020, 0x80008020, 0x80000020, 0x00100020,
      0x00108000, 0x00000000, 0x80008000, 0x00008020,
      0x80000000, 0x80100020, 0x80108020, 0x00108000
};

static const u32 S3[64] = {
      0x00000208, 0x08020200, 0x00000000, 0x08020008,
      0x08000200, 0x00000000, 0x00020208, 0x08000200,
      0x00020008, 0x08000008, 0x08000008, 0x00020000,
      0x08020208, 0x00020008, 0x08020000, 0x00000208,
      0x08000000, 0x00000008, 0x08020200, 0x00000200,
      0x00020200, 0x08020000, 0x08020008, 0x00020208,
      0x08000208, 0x00020200, 0x00020000, 0x08000208,
      0x00000008, 0x08020208, 0x00000200, 0x08000000,
      0x08020200, 0x08000000, 0x00020008, 0x00000208,
      0x00020000, 0x08020200, 0x08000200, 0x00000000,
      0x00000200, 0x00020008, 0x08020208, 0x08000200,
      0x08000008, 0x00000200, 0x00000000, 0x08020008,
      0x08000208, 0x00020000, 0x08000000, 0x08020208,
      0x00000008, 0x00020208, 0x00020200, 0x08000008,
      0x08020000, 0x08000208, 0x00000208, 0x08020000,
      0x00020208, 0x00000008, 0x08020008, 0x00020200
};

static const u32 S4[64] = {
      0x00802001, 0x00002081, 0x00002081, 0x00000080,
      0x00802080, 0x00800081, 0x00800001, 0x00002001,
      0x00000000, 0x00802000, 0x00802000, 0x00802081,
      0x00000081, 0x00000000, 0x00800080, 0x00800001,
      0x00000001, 0x00002000, 0x00800000, 0x00802001,
      0x00000080, 0x00800000, 0x00002001, 0x00002080,
      0x00800081, 0x00000001, 0x00002080, 0x00800080,
      0x00002000, 0x00802080, 0x00802081, 0x00000081,
      0x00800080, 0x00800001, 0x00802000, 0x00802081,
      0x00000081, 0x00000000, 0x00000000, 0x00802000,
      0x00002080, 0x00800080, 0x00800081, 0x00000001,
      0x00802001, 0x00002081, 0x00002081, 0x00000080,
      0x00802081, 0x00000081, 0x00000001, 0x00002000,
      0x00800001, 0x00002001, 0x00802080, 0x00800081,
      0x00002001, 0x00002080, 0x00800000, 0x00802001,
      0x00000080, 0x00800000, 0x00002000, 0x00802080
};

static const u32 S5[64] = {
      0x00000100, 0x02080100, 0x02080000, 0x42000100,
      0x00080000, 0x00000100, 0x40000000, 0x02080000,
      0x40080100, 0x00080000, 0x02000100, 0x40080100,
      0x42000100, 0x42080000, 0x00080100, 0x40000000,
      0x02000000, 0x40080000, 0x40080000, 0x00000000,
      0x40000100, 0x42080100, 0x42080100, 0x02000100,
      0x42080000, 0x40000100, 0x00000000, 0x42000000,
      0x02080100, 0x02000000, 0x42000000, 0x00080100,
      0x00080000, 0x42000100, 0x00000100, 0x02000000,
      0x40000000, 0x02080000, 0x42000100, 0x40080100,
      0x02000100, 0x40000000, 0x42080000, 0x02080100,
      0x40080100, 0x00000100, 0x02000000, 0x42080000,
      0x42080100, 0x00080100, 0x42000000, 0x42080100,
      0x02080000, 0x00000000, 0x40080000, 0x42000000,
      0x00080100, 0x02000100, 0x40000100, 0x00080000,
      0x00000000, 0x40080000, 0x02080100, 0x40000100
};

static const u32 S6[64] = {
      0x20000010, 0x20400000, 0x00004000, 0x20404010,
      0x20400000, 0x00000010, 0x20404010, 0x00400000,
      0x20004000, 0x00404010, 0x00400000, 0x20000010,
      0x00400010, 0x20004000, 0x20000000, 0x00004010,
      0x00000000, 0x00400010, 0x20004010, 0x00004000,
      0x00404000, 0x20004010, 0x00000010, 0x20400010,
      0x20400010, 0x00000000, 0x00404010, 0x20404000,
      0x00004010, 0x00404000, 0x20404000, 0x20000000,
      0x20004000, 0x00000010, 0x20400010, 0x00404000,
      0x20404010, 0x00400000, 0x00004010, 0x20000010,
      0x00400000, 0x20004000, 0x20000000, 0x00004010,
      0x20000010, 0x20404010, 0x00404000, 0x20400000,
      0x00404010, 0x20404000, 0x00000000, 0x20400010,
      0x00000010, 0x00004000, 0x20400000, 0x00404010,
      0x00004000, 0x00400010, 0x20004010, 0x00000000,
      0x20404000, 0x20000000, 0x00400010, 0x20004010
};

static const u32 S7[64] = {
      0x00200000, 0x04200002, 0x04000802, 0x00000000,
      0x00000800, 0x04000802, 0x00200802, 0x04200800,
      0x04200802, 0x00200000, 0x00000000, 0x04000002,
      0x00000002, 0x04000000, 0x04200002, 0x00000802,
      0x04000800, 0x00200802, 0x00200002, 0x04000800,
      0x04000002, 0x04200000, 0x04200800, 0x00200002,
      0x04200000, 0x00000800, 0x00000802, 0x04200802,
      0x00200800, 0x00000002, 0x04000000, 0x00200800,
      0x04000000, 0x00200800, 0x00200000, 0x04000802,
      0x04000802, 0x04200002, 0x04200002, 0x00000002,
      0x00200002, 0x04000000, 0x04000800, 0x00200000,
      0x04200800, 0x00000802, 0x00200802, 0x04200800,
      0x00000802, 0x04000002, 0x04200802, 0x04200000,
      0x00200800, 0x00000000, 0x00000002, 0x04200802,
      0x00000000, 0x00200802, 0x04200000, 0x00000800,
      0x04000002, 0x04000800, 0x00000800, 0x00200002
};

static const u32 S8[64] = {
      0x10001040, 0x00001000, 0x00040000, 0x10041040,
      0x10000000, 0x10001040, 0x00000040, 0x10000000,
      0x00040040, 0x10040000, 0x10041040, 0x00041000,
      0x10041000, 0x00041040, 0x00001000, 0x00000040,
      0x10040000, 0x10000040, 0x10001000, 0x00001040,
      0x00041000, 0x00040040, 0x10040040, 0x10041000,
      0x00001040, 0x00000000, 0x00000000, 0x10040040,
      0x10000040, 0x10001000, 0x00041040, 0x00040000,
      0x00041040, 0x00040000, 0x10041000, 0x00001000,
      0x00000040, 0x10040040, 0x00001000, 0x00041040,
      0x10001000, 0x00000040, 0x10000040, 0x10040000,
      0x10040040, 0x10000000, 0x00040000, 0x10001040,
      0x00000000, 0x10041040, 0x00040040, 0x10000040,
      0x10040000, 0x10001000, 0x10001040, 0x00000000,
      0x10041040, 0x00041000, 0x00041000, 0x00001040,
      0x00001040, 0x00040040, 0x10000000, 0x10041000
};

/* Encryption components: IP, FP, and round function */

#define IP(L, R, T)           \
      ROL(R, 4);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xf0f0f0f0;  \
      R ^= L;                 \
      L ^= T;                 \
      ROL(R, 12);       \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xffff0000;  \
      R ^= L;                 \
      L ^= T;                 \
      ROR(R, 14);       \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xcccccccc;  \
      R ^= L;                 \
      L ^= T;                 \
      ROL(R, 6);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xff00ff00;  \
      R ^= L;                 \
      L ^= T;                 \
      ROR(R, 7);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xaaaaaaaa;  \
      R ^= L;                 \
      L ^= T;                 \
      ROL(L, 1);

#define FP(L, R, T)           \
      ROR(L, 1);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xaaaaaaaa;  \
      R ^= L;                 \
      L ^= T;                 \
      ROL(R, 7);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xff00ff00;  \
      R ^= L;                 \
      L ^= T;                 \
      ROR(R, 6);        \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xcccccccc;  \
      R ^= L;                 \
      L ^= T;                 \
      ROL(R, 14);       \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xffff0000;  \
      R ^= L;                 \
      L ^= T;                 \
      ROR(R, 12);       \
      T  = L;                 \
      L ^= R;                 \
      L &= 0xf0f0f0f0;  \
      R ^= L;                 \
      L ^= T;                 \
      ROR(R, 4);

#define ROUND(L, R, A, B, K, d)                             \
      B = K[0];               A = K[1];   K += d;     \
      B ^= R;                       A ^= R;                 \
      B &= 0x3f3f3f3f;        ROR(A, 4);        \
      L ^= S8[0xff & B];            A &= 0x3f3f3f3f;  \
      L ^= S6[0xff & (B >> 8)];     B >>= 16;         \
      L ^= S7[0xff & A];                              \
      L ^= S5[0xff & (A >> 8)];     A >>= 16;         \
      L ^= S4[0xff & B];                              \
      L ^= S2[0xff & (B >> 8)];                       \
      L ^= S3[0xff & A];                              \
      L ^= S1[0xff & (A >> 8)];

/*
 * PC2 lookup tables are organized as 2 consecutive sets of 4 interleaved
 * tables of 128 elements.  One set is for C_i and the other for D_i, while
 * the 4 interleaved tables correspond to four 7-bit subsets of C_i or D_i.
 *
 * After PC1 each of the variables a,b,c,d contains a 7 bit subset of C_i
 * or D_i in bits 7-1 (bit 0 being the least significant).
 */

#define T1(x) pt[2 * (x) + 0]
#define T2(x) pt[2 * (x) + 1]
#define T3(x) pt[2 * (x) + 2]
#define T4(x) pt[2 * (x) + 3]

#define PC2(a, b, c, d) (T4(d) | T3(c) | T2(b) | T1(a))

/*
 * Encryption key expansion
 *
 * RFC2451: Weak key checks SHOULD be performed.
 *
 * FIPS 74:
 *
 *   Keys having duals are keys which produce all zeros, all ones, or
 *   alternating zero-one patterns in the C and D registers after Permuted
 *   Choice 1 has operated on the key.
 *
 */
static unsigned long ekey(u32 *pe, const u8 *k)
{
      /* K&R: long is at least 32 bits */
      unsigned long a, b, c, d, w;
      const u32 *pt = pc2;

      d = k[4]; d &= 0x0e; d <<= 4; d |= k[0] & 0x1e; d = pc1[d];
      c = k[5]; c &= 0x0e; c <<= 4; c |= k[1] & 0x1e; c = pc1[c];
      b = k[6]; b &= 0x0e; b <<= 4; b |= k[2] & 0x1e; b = pc1[b];
      a = k[7]; a &= 0x0e; a <<= 4; a |= k[3] & 0x1e; a = pc1[a];

      pe[15 * 2 + 0] = PC2(a, b, c, d); d = rs[d];
      pe[14 * 2 + 0] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[13 * 2 + 0] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[12 * 2 + 0] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[11 * 2 + 0] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[10 * 2 + 0] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 9 * 2 + 0] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 8 * 2 + 0] = PC2(d, a, b, c); c = rs[c];
      pe[ 7 * 2 + 0] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 6 * 2 + 0] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 5 * 2 + 0] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 4 * 2 + 0] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 3 * 2 + 0] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 2 * 2 + 0] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 1 * 2 + 0] = PC2(c, d, a, b); b = rs[b];
      pe[ 0 * 2 + 0] = PC2(b, c, d, a);

      /* Check if first half is weak */
      w  = (a ^ c) | (b ^ d) | (rs[a] ^ c) | (b ^ rs[d]);

      /* Skip to next table set */
      pt += 512;

      d = k[0]; d &= 0xe0; d >>= 4; d |= k[4] & 0xf0; d = pc1[d + 1];
      c = k[1]; c &= 0xe0; c >>= 4; c |= k[5] & 0xf0; c = pc1[c + 1];
      b = k[2]; b &= 0xe0; b >>= 4; b |= k[6] & 0xf0; b = pc1[b + 1];
      a = k[3]; a &= 0xe0; a >>= 4; a |= k[7] & 0xf0; a = pc1[a + 1];

      /* Check if second half is weak */
      w |= (a ^ c) | (b ^ d) | (rs[a] ^ c) | (b ^ rs[d]);

      pe[15 * 2 + 1] = PC2(a, b, c, d); d = rs[d];
      pe[14 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[13 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[12 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[11 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[10 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 9 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 8 * 2 + 1] = PC2(d, a, b, c); c = rs[c];
      pe[ 7 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 6 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 5 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 4 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 3 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 2 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[ 1 * 2 + 1] = PC2(c, d, a, b); b = rs[b];
      pe[ 0 * 2 + 1] = PC2(b, c, d, a);

      /* Fixup: 2413 5768 -> 1357 2468 */
      for (d = 0; d < 16; ++d) {
            a = pe[2 * d];
            b = pe[2 * d + 1];
            c = a ^ b;
            c &= 0xffff0000;
            a ^= c;
            b ^= c;
            ROL(b, 18);
            pe[2 * d] = a;
            pe[2 * d + 1] = b;
      }

      /* Zero if weak key */
      return w;
}

/*
 * Decryption key expansion
 *
 * No weak key checking is performed, as this is only used by triple DES
 *
 */
static void dkey(u32 *pe, const u8 *k)
{
      /* K&R: long is at least 32 bits */
      unsigned long a, b, c, d;
      const u32 *pt = pc2;

      d = k[4]; d &= 0x0e; d <<= 4; d |= k[0] & 0x1e; d = pc1[d];
      c = k[5]; c &= 0x0e; c <<= 4; c |= k[1] & 0x1e; c = pc1[c];
      b = k[6]; b &= 0x0e; b <<= 4; b |= k[2] & 0x1e; b = pc1[b];
      a = k[7]; a &= 0x0e; a <<= 4; a |= k[3] & 0x1e; a = pc1[a];

      pe[ 0 * 2] = PC2(a, b, c, d); d = rs[d];
      pe[ 1 * 2] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 2 * 2] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 3 * 2] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 4 * 2] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 5 * 2] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 6 * 2] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 7 * 2] = PC2(d, a, b, c); c = rs[c];
      pe[ 8 * 2] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 9 * 2] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[10 * 2] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[11 * 2] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[12 * 2] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[13 * 2] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[14 * 2] = PC2(c, d, a, b); b = rs[b];
      pe[15 * 2] = PC2(b, c, d, a);

      /* Skip to next table set */
      pt += 512;

      d = k[0]; d &= 0xe0; d >>= 4; d |= k[4] & 0xf0; d = pc1[d + 1];
      c = k[1]; c &= 0xe0; c >>= 4; c |= k[5] & 0xf0; c = pc1[c + 1];
      b = k[2]; b &= 0xe0; b >>= 4; b |= k[6] & 0xf0; b = pc1[b + 1];
      a = k[3]; a &= 0xe0; a >>= 4; a |= k[7] & 0xf0; a = pc1[a + 1];

      pe[ 0 * 2 + 1] = PC2(a, b, c, d); d = rs[d];
      pe[ 1 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 2 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 3 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 4 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 5 * 2 + 1] = PC2(d, a, b, c); c = rs[c]; b = rs[b];
      pe[ 6 * 2 + 1] = PC2(b, c, d, a); a = rs[a]; d = rs[d];
      pe[ 7 * 2 + 1] = PC2(d, a, b, c); c = rs[c];
      pe[ 8 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[ 9 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[10 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[11 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[12 * 2 + 1] = PC2(c, d, a, b); b = rs[b]; a = rs[a];
      pe[13 * 2 + 1] = PC2(a, b, c, d); d = rs[d]; c = rs[c];
      pe[14 * 2 + 1] = PC2(c, d, a, b); b = rs[b];
      pe[15 * 2 + 1] = PC2(b, c, d, a);

      /* Fixup: 2413 5768 -> 1357 2468 */
      for (d = 0; d < 16; ++d) {
            a = pe[2 * d];
            b = pe[2 * d + 1];
            c = a ^ b;
            c &= 0xffff0000;
            a ^= c;
            b ^= c;
            ROL(b, 18);
            pe[2 * d] = a;
            pe[2 * d + 1] = b;
      }
}

static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
                  unsigned int keylen)
{
      struct des_ctx *dctx = crypto_tfm_ctx(tfm);
      u32 *flags = &tfm->crt_flags;
      u32 tmp[DES_EXPKEY_WORDS];
      int ret;

      /* Expand to tmp */
      ret = ekey(tmp, key);

      if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
            *flags |= CRYPTO_TFM_RES_WEAK_KEY;
            return -EINVAL;
      }

      /* Copy to output */
      memcpy(dctx->expkey, tmp, sizeof(dctx->expkey));

      return 0;
}

static void des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
      struct des_ctx *ctx = crypto_tfm_ctx(tfm);
      const u32 *K = ctx->expkey;
      const __le32 *s = (const __le32 *)src;
      __le32 *d = (__le32 *)dst;
      u32 L, R, A, B;
      int i;

      L = le32_to_cpu(s[0]);
      R = le32_to_cpu(s[1]);

      IP(L, R, A);
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, 2);
            ROUND(R, L, A, B, K, 2);
      }
      FP(R, L, A);

      d[0] = cpu_to_le32(R);
      d[1] = cpu_to_le32(L);
}

static void des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
      struct des_ctx *ctx = crypto_tfm_ctx(tfm);
      const u32 *K = ctx->expkey + DES_EXPKEY_WORDS - 2;
      const __le32 *s = (const __le32 *)src;
      __le32 *d = (__le32 *)dst;
      u32 L, R, A, B;
      int i;

      L = le32_to_cpu(s[0]);
      R = le32_to_cpu(s[1]);

      IP(L, R, A);
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, -2);
            ROUND(R, L, A, B, K, -2);
      }
      FP(R, L, A);

      d[0] = cpu_to_le32(R);
      d[1] = cpu_to_le32(L);
}

/*
 * RFC2451:
 *
 *   For DES-EDE3, there is no known need to reject weak or
 *   complementation keys.  Any weakness is obviated by the use of
 *   multiple keys.
 *
 *   However, if the first two or last two independent 64-bit keys are
 *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
 *   same as DES.  Implementers MUST reject keys that exhibit this
 *   property.
 *
 */
static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
                     unsigned int keylen)
{
      const u32 *K = (const u32 *)key;
      struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
      u32 *expkey = dctx->expkey;
      u32 *flags = &tfm->crt_flags;

      if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
                 !((K[2] ^ K[4]) | (K[3] ^ K[5]))))
      {
            *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
            return -EINVAL;
      }

      ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
      dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
      ekey(expkey, key);

      return 0;
}

static void des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
      struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
      const u32 *K = dctx->expkey;
      const __le32 *s = (const __le32 *)src;
      __le32 *d = (__le32 *)dst;
      u32 L, R, A, B;
      int i;

      L = le32_to_cpu(s[0]);
      R = le32_to_cpu(s[1]);

      IP(L, R, A);
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, 2);
            ROUND(R, L, A, B, K, 2);
      }
      for (i = 0; i < 8; i++) {
            ROUND(R, L, A, B, K, 2);
            ROUND(L, R, A, B, K, 2);
      }
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, 2);
            ROUND(R, L, A, B, K, 2);
      }
      FP(R, L, A);

      d[0] = cpu_to_le32(R);
      d[1] = cpu_to_le32(L);
}

static void des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
      struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
      const u32 *K = dctx->expkey + DES3_EDE_EXPKEY_WORDS - 2;
      const __le32 *s = (const __le32 *)src;
      __le32 *d = (__le32 *)dst;
      u32 L, R, A, B;
      int i;

      L = le32_to_cpu(s[0]);
      R = le32_to_cpu(s[1]);

      IP(L, R, A);
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, -2);
            ROUND(R, L, A, B, K, -2);
      }
      for (i = 0; i < 8; i++) {
            ROUND(R, L, A, B, K, -2);
            ROUND(L, R, A, B, K, -2);
      }
      for (i = 0; i < 8; i++) {
            ROUND(L, R, A, B, K, -2);
            ROUND(R, L, A, B, K, -2);
      }
      FP(R, L, A);

      d[0] = cpu_to_le32(R);
      d[1] = cpu_to_le32(L);
}

static struct crypto_alg des_alg = {
      .cra_name         =     "des",
      .cra_flags        =     CRYPTO_ALG_TYPE_CIPHER,
      .cra_blocksize          =     DES_BLOCK_SIZE,
      .cra_ctxsize            =     sizeof(struct des_ctx),
      .cra_module       =     THIS_MODULE,
      .cra_alignmask          =     3,
      .cra_list         =     LIST_HEAD_INIT(des_alg.cra_list),
      .cra_u                  =     { .cipher = {
      .cia_min_keysize  =     DES_KEY_SIZE,
      .cia_max_keysize  =     DES_KEY_SIZE,
      .cia_setkey       =     des_setkey,
      .cia_encrypt            =     des_encrypt,
      .cia_decrypt            =     des_decrypt } }
};

static struct crypto_alg des3_ede_alg = {
      .cra_name         =     "des3_ede",
      .cra_flags        =     CRYPTO_ALG_TYPE_CIPHER,
      .cra_blocksize          =     DES3_EDE_BLOCK_SIZE,
      .cra_ctxsize            =     sizeof(struct des3_ede_ctx),
      .cra_module       =     THIS_MODULE,
      .cra_alignmask          =     3,
      .cra_list         =     LIST_HEAD_INIT(des3_ede_alg.cra_list),
      .cra_u                  =     { .cipher = {
      .cia_min_keysize  =     DES3_EDE_KEY_SIZE,
      .cia_max_keysize  =     DES3_EDE_KEY_SIZE,
      .cia_setkey       =     des3_ede_setkey,
      .cia_encrypt            =     des3_ede_encrypt,
      .cia_decrypt            =     des3_ede_decrypt } }
};

MODULE_ALIAS("des3_ede");

static int __init init(void)
{
      int ret = 0;

      ret = crypto_register_alg(&des_alg);
      if (ret < 0)
            goto out;

      ret = crypto_register_alg(&des3_ede_alg);
      if (ret < 0)
            crypto_unregister_alg(&des_alg);
out:
      return ret;
}

static void __exit fini(void)
{
      crypto_unregister_alg(&des3_ede_alg);
      crypto_unregister_alg(&des_alg);
}

module_init(init);
module_exit(fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
MODULE_ALIAS("des");

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