cregit-Linux how code gets into the kernel

Release 4.10 crypto/des_generic.c

Directory: crypto
 * Cryptographic API.
 * DES & Triple DES EDE Cipher Algorithms.
 * Copyright (c) 2005 Dag Arne Osvik <>
 * 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>

#include <crypto/des.h>

#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