blowfish.c 17.5 KB
Newer Older
1 2 3
/* blowfish.c
 *
 * The blowfish block cipher.
4 5 6 7
 *
 * For a description of the algorithm, see:
 *   Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1996.
 *   ISBN 0-471-11709-9. Pages 336 ff.
8 9 10 11 12 13 14 15
 */

/* NOTE: This file is distributed under the GPL, not the LGPL. */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 1998, 2001
 *    Free Software Foundation, Inc, Ray Dassen, Niels Mller
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
 *
 * This file is part of GNUPG.
 *
 * GNUPG 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.
 *
 * GNUPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

34 35 36 37 38 39
#if HAVE_CONFIG_H
# include "config.h"
#endif

#include <assert.h>

40 41
#include "blowfish.h"

42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
#include "macros.h"

/* Initial keysetup state */
static const struct blowfish_ctx
initial_ctx =
{ /* precomputed S boxes */
  {
    {
      0xD1310BA6,0x98DFB5AC,0x2FFD72DB,0xD01ADFB7,0xB8E1AFED,0x6A267E96,
      0xBA7C9045,0xF12C7F99,0x24A19947,0xB3916CF7,0x0801F2E2,0x858EFC16,
      0x636920D8,0x71574E69,0xA458FEA3,0xF4933D7E,0x0D95748F,0x728EB658,
      0x718BCD58,0x82154AEE,0x7B54A41D,0xC25A59B5,0x9C30D539,0x2AF26013,
      0xC5D1B023,0x286085F0,0xCA417918,0xB8DB38EF,0x8E79DCB0,0x603A180E,
      0x6C9E0E8B,0xB01E8A3E,0xD71577C1,0xBD314B27,0x78AF2FDA,0x55605C60,
      0xE65525F3,0xAA55AB94,0x57489862,0x63E81440,0x55CA396A,0x2AAB10B6,
      0xB4CC5C34,0x1141E8CE,0xA15486AF,0x7C72E993,0xB3EE1411,0x636FBC2A,
      0x2BA9C55D,0x741831F6,0xCE5C3E16,0x9B87931E,0xAFD6BA33,0x6C24CF5C,
      0x7A325381,0x28958677,0x3B8F4898,0x6B4BB9AF,0xC4BFE81B,0x66282193,
      0x61D809CC,0xFB21A991,0x487CAC60,0x5DEC8032,0xEF845D5D,0xE98575B1,
      0xDC262302,0xEB651B88,0x23893E81,0xD396ACC5,0x0F6D6FF3,0x83F44239,
      0x2E0B4482,0xA4842004,0x69C8F04A,0x9E1F9B5E,0x21C66842,0xF6E96C9A,
      0x670C9C61,0xABD388F0,0x6A51A0D2,0xD8542F68,0x960FA728,0xAB5133A3,
      0x6EEF0B6C,0x137A3BE4,0xBA3BF050,0x7EFB2A98,0xA1F1651D,0x39AF0176,
      0x66CA593E,0x82430E88,0x8CEE8619,0x456F9FB4,0x7D84A5C3,0x3B8B5EBE,
      0xE06F75D8,0x85C12073,0x401A449F,0x56C16AA6,0x4ED3AA62,0x363F7706,
      0x1BFEDF72,0x429B023D,0x37D0D724,0xD00A1248,0xDB0FEAD3,0x49F1C09B,
      0x075372C9,0x80991B7B,0x25D479D8,0xF6E8DEF7,0xE3FE501A,0xB6794C3B,
      0x976CE0BD,0x04C006BA,0xC1A94FB6,0x409F60C4,0x5E5C9EC2,0x196A2463,
      0x68FB6FAF,0x3E6C53B5,0x1339B2EB,0x3B52EC6F,0x6DFC511F,0x9B30952C,
      0xCC814544,0xAF5EBD09,0xBEE3D004,0xDE334AFD,0x660F2807,0x192E4BB3,
      0xC0CBA857,0x45C8740F,0xD20B5F39,0xB9D3FBDB,0x5579C0BD,0x1A60320A,
      0xD6A100C6,0x402C7279,0x679F25FE,0xFB1FA3CC,0x8EA5E9F8,0xDB3222F8,
      0x3C7516DF,0xFD616B15,0x2F501EC8,0xAD0552AB,0x323DB5FA,0xFD238760,
      0x53317B48,0x3E00DF82,0x9E5C57BB,0xCA6F8CA0,0x1A87562E,0xDF1769DB,
      0xD542A8F6,0x287EFFC3,0xAC6732C6,0x8C4F5573,0x695B27B0,0xBBCA58C8,
      0xE1FFA35D,0xB8F011A0,0x10FA3D98,0xFD2183B8,0x4AFCB56C,0x2DD1D35B,
      0x9A53E479,0xB6F84565,0xD28E49BC,0x4BFB9790,0xE1DDF2DA,0xA4CB7E33,
      0x62FB1341,0xCEE4C6E8,0xEF20CADA,0x36774C01,0xD07E9EFE,0x2BF11FB4,
      0x95DBDA4D,0xAE909198,0xEAAD8E71,0x6B93D5A0,0xD08ED1D0,0xAFC725E0,
      0x8E3C5B2F,0x8E7594B7,0x8FF6E2FB,0xF2122B64,0x8888B812,0x900DF01C,
      0x4FAD5EA0,0x688FC31C,0xD1CFF191,0xB3A8C1AD,0x2F2F2218,0xBE0E1777,
      0xEA752DFE,0x8B021FA1,0xE5A0CC0F,0xB56F74E8,0x18ACF3D6,0xCE89E299,
      0xB4A84FE0,0xFD13E0B7,0x7CC43B81,0xD2ADA8D9,0x165FA266,0x80957705,
      0x93CC7314,0x211A1477,0xE6AD2065,0x77B5FA86,0xC75442F5,0xFB9D35CF,
      0xEBCDAF0C,0x7B3E89A0,0xD6411BD3,0xAE1E7E49,0x00250E2D,0x2071B35E,
      0x226800BB,0x57B8E0AF,0x2464369B,0xF009B91E,0x5563911D,0x59DFA6AA,
      0x78C14389,0xD95A537F,0x207D5BA2,0x02E5B9C5,0x83260376,0x6295CFA9,
      0x11C81968,0x4E734A41,0xB3472DCA,0x7B14A94A,0x1B510052,0x9A532915,
      0xD60F573F,0xBC9BC6E4,0x2B60A476,0x81E67400,0x08BA6FB5,0x571BE91F,
      0xF296EC6B,0x2A0DD915,0xB6636521,0xE7B9F9B6,0xFF34052E,0xC5855664,
      0x53B02D5D,0xA99F8FA1,0x08BA4799,0x6E85076A
    }, {
      0x4B7A70E9,0xB5B32944,0xDB75092E,0xC4192623,0xAD6EA6B0,0x49A7DF7D,
      0x9CEE60B8,0x8FEDB266,0xECAA8C71,0x699A17FF,0x5664526C,0xC2B19EE1,
      0x193602A5,0x75094C29,0xA0591340,0xE4183A3E,0x3F54989A,0x5B429D65,
      0x6B8FE4D6,0x99F73FD6,0xA1D29C07,0xEFE830F5,0x4D2D38E6,0xF0255DC1,
      0x4CDD2086,0x8470EB26,0x6382E9C6,0x021ECC5E,0x09686B3F,0x3EBAEFC9,
      0x3C971814,0x6B6A70A1,0x687F3584,0x52A0E286,0xB79C5305,0xAA500737,
      0x3E07841C,0x7FDEAE5C,0x8E7D44EC,0x5716F2B8,0xB03ADA37,0xF0500C0D,
      0xF01C1F04,0x0200B3FF,0xAE0CF51A,0x3CB574B2,0x25837A58,0xDC0921BD,
      0xD19113F9,0x7CA92FF6,0x94324773,0x22F54701,0x3AE5E581,0x37C2DADC,
      0xC8B57634,0x9AF3DDA7,0xA9446146,0x0FD0030E,0xECC8C73E,0xA4751E41,
      0xE238CD99,0x3BEA0E2F,0x3280BBA1,0x183EB331,0x4E548B38,0x4F6DB908,
      0x6F420D03,0xF60A04BF,0x2CB81290,0x24977C79,0x5679B072,0xBCAF89AF,
      0xDE9A771F,0xD9930810,0xB38BAE12,0xDCCF3F2E,0x5512721F,0x2E6B7124,
      0x501ADDE6,0x9F84CD87,0x7A584718,0x7408DA17,0xBC9F9ABC,0xE94B7D8C,
      0xEC7AEC3A,0xDB851DFA,0x63094366,0xC464C3D2,0xEF1C1847,0x3215D908,
      0xDD433B37,0x24C2BA16,0x12A14D43,0x2A65C451,0x50940002,0x133AE4DD,
      0x71DFF89E,0x10314E55,0x81AC77D6,0x5F11199B,0x043556F1,0xD7A3C76B,
      0x3C11183B,0x5924A509,0xF28FE6ED,0x97F1FBFA,0x9EBABF2C,0x1E153C6E,
      0x86E34570,0xEAE96FB1,0x860E5E0A,0x5A3E2AB3,0x771FE71C,0x4E3D06FA,
      0x2965DCB9,0x99E71D0F,0x803E89D6,0x5266C825,0x2E4CC978,0x9C10B36A,
      0xC6150EBA,0x94E2EA78,0xA5FC3C53,0x1E0A2DF4,0xF2F74EA7,0x361D2B3D,
      0x1939260F,0x19C27960,0x5223A708,0xF71312B6,0xEBADFE6E,0xEAC31F66,
      0xE3BC4595,0xA67BC883,0xB17F37D1,0x018CFF28,0xC332DDEF,0xBE6C5AA5,
      0x65582185,0x68AB9802,0xEECEA50F,0xDB2F953B,0x2AEF7DAD,0x5B6E2F84,
      0x1521B628,0x29076170,0xECDD4775,0x619F1510,0x13CCA830,0xEB61BD96,
      0x0334FE1E,0xAA0363CF,0xB5735C90,0x4C70A239,0xD59E9E0B,0xCBAADE14,
      0xEECC86BC,0x60622CA7,0x9CAB5CAB,0xB2F3846E,0x648B1EAF,0x19BDF0CA,
      0xA02369B9,0x655ABB50,0x40685A32,0x3C2AB4B3,0x319EE9D5,0xC021B8F7,
      0x9B540B19,0x875FA099,0x95F7997E,0x623D7DA8,0xF837889A,0x97E32D77,
      0x11ED935F,0x16681281,0x0E358829,0xC7E61FD6,0x96DEDFA1,0x7858BA99,
      0x57F584A5,0x1B227263,0x9B83C3FF,0x1AC24696,0xCDB30AEB,0x532E3054,
      0x8FD948E4,0x6DBC3128,0x58EBF2EF,0x34C6FFEA,0xFE28ED61,0xEE7C3C73,
      0x5D4A14D9,0xE864B7E3,0x42105D14,0x203E13E0,0x45EEE2B6,0xA3AAABEA,
      0xDB6C4F15,0xFACB4FD0,0xC742F442,0xEF6ABBB5,0x654F3B1D,0x41CD2105,
      0xD81E799E,0x86854DC7,0xE44B476A,0x3D816250,0xCF62A1F2,0x5B8D2646,
      0xFC8883A0,0xC1C7B6A3,0x7F1524C3,0x69CB7492,0x47848A0B,0x5692B285,
      0x095BBF00,0xAD19489D,0x1462B174,0x23820E00,0x58428D2A,0x0C55F5EA,
      0x1DADF43E,0x233F7061,0x3372F092,0x8D937E41,0xD65FECF1,0x6C223BDB,
      0x7CDE3759,0xCBEE7460,0x4085F2A7,0xCE77326E,0xA6078084,0x19F8509E,
      0xE8EFD855,0x61D99735,0xA969A7AA,0xC50C06C2,0x5A04ABFC,0x800BCADC,
      0x9E447A2E,0xC3453484,0xFDD56705,0x0E1E9EC9,0xDB73DBD3,0x105588CD,
      0x675FDA79,0xE3674340,0xC5C43465,0x713E38D8,0x3D28F89E,0xF16DFF20,
      0x153E21E7,0x8FB03D4A,0xE6E39F2B,0xDB83ADF7
    }, {
      0xE93D5A68,0x948140F7,0xF64C261C,0x94692934,0x411520F7,0x7602D4F7,
      0xBCF46B2E,0xD4A20068,0xD4082471,0x3320F46A,0x43B7D4B7,0x500061AF,
      0x1E39F62E,0x97244546,0x14214F74,0xBF8B8840,0x4D95FC1D,0x96B591AF,
      0x70F4DDD3,0x66A02F45,0xBFBC09EC,0x03BD9785,0x7FAC6DD0,0x31CB8504,
      0x96EB27B3,0x55FD3941,0xDA2547E6,0xABCA0A9A,0x28507825,0x530429F4,
      0x0A2C86DA,0xE9B66DFB,0x68DC1462,0xD7486900,0x680EC0A4,0x27A18DEE,
      0x4F3FFEA2,0xE887AD8C,0xB58CE006,0x7AF4D6B6,0xAACE1E7C,0xD3375FEC,
      0xCE78A399,0x406B2A42,0x20FE9E35,0xD9F385B9,0xEE39D7AB,0x3B124E8B,
      0x1DC9FAF7,0x4B6D1856,0x26A36631,0xEAE397B2,0x3A6EFA74,0xDD5B4332,
      0x6841E7F7,0xCA7820FB,0xFB0AF54E,0xD8FEB397,0x454056AC,0xBA489527,
      0x55533A3A,0x20838D87,0xFE6BA9B7,0xD096954B,0x55A867BC,0xA1159A58,
      0xCCA92963,0x99E1DB33,0xA62A4A56,0x3F3125F9,0x5EF47E1C,0x9029317C,
      0xFDF8E802,0x04272F70,0x80BB155C,0x05282CE3,0x95C11548,0xE4C66D22,
      0x48C1133F,0xC70F86DC,0x07F9C9EE,0x41041F0F,0x404779A4,0x5D886E17,
      0x325F51EB,0xD59BC0D1,0xF2BCC18F,0x41113564,0x257B7834,0x602A9C60,
      0xDFF8E8A3,0x1F636C1B,0x0E12B4C2,0x02E1329E,0xAF664FD1,0xCAD18115,
      0x6B2395E0,0x333E92E1,0x3B240B62,0xEEBEB922,0x85B2A20E,0xE6BA0D99,
      0xDE720C8C,0x2DA2F728,0xD0127845,0x95B794FD,0x647D0862,0xE7CCF5F0,
      0x5449A36F,0x877D48FA,0xC39DFD27,0xF33E8D1E,0x0A476341,0x992EFF74,
      0x3A6F6EAB,0xF4F8FD37,0xA812DC60,0xA1EBDDF8,0x991BE14C,0xDB6E6B0D,
      0xC67B5510,0x6D672C37,0x2765D43B,0xDCD0E804,0xF1290DC7,0xCC00FFA3,
      0xB5390F92,0x690FED0B,0x667B9FFB,0xCEDB7D9C,0xA091CF0B,0xD9155EA3,
      0xBB132F88,0x515BAD24,0x7B9479BF,0x763BD6EB,0x37392EB3,0xCC115979,
      0x8026E297,0xF42E312D,0x6842ADA7,0xC66A2B3B,0x12754CCC,0x782EF11C,
      0x6A124237,0xB79251E7,0x06A1BBE6,0x4BFB6350,0x1A6B1018,0x11CAEDFA,
      0x3D25BDD8,0xE2E1C3C9,0x44421659,0x0A121386,0xD90CEC6E,0xD5ABEA2A,
      0x64AF674E,0xDA86A85F,0xBEBFE988,0x64E4C3FE,0x9DBC8057,0xF0F7C086,
      0x60787BF8,0x6003604D,0xD1FD8346,0xF6381FB0,0x7745AE04,0xD736FCCC,
      0x83426B33,0xF01EAB71,0xB0804187,0x3C005E5F,0x77A057BE,0xBDE8AE24,
      0x55464299,0xBF582E61,0x4E58F48F,0xF2DDFDA2,0xF474EF38,0x8789BDC2,
      0x5366F9C3,0xC8B38E74,0xB475F255,0x46FCD9B9,0x7AEB2661,0x8B1DDF84,
      0x846A0E79,0x915F95E2,0x466E598E,0x20B45770,0x8CD55591,0xC902DE4C,
      0xB90BACE1,0xBB8205D0,0x11A86248,0x7574A99E,0xB77F19B6,0xE0A9DC09,
      0x662D09A1,0xC4324633,0xE85A1F02,0x09F0BE8C,0x4A99A025,0x1D6EFE10,
      0x1AB93D1D,0x0BA5A4DF,0xA186F20F,0x2868F169,0xDCB7DA83,0x573906FE,
      0xA1E2CE9B,0x4FCD7F52,0x50115E01,0xA70683FA,0xA002B5C4,0x0DE6D027,
      0x9AF88C27,0x773F8641,0xC3604C06,0x61A806B5,0xF0177A28,0xC0F586E0,
      0x006058AA,0x30DC7D62,0x11E69ED7,0x2338EA63,0x53C2DD94,0xC2C21634,
      0xBBCBEE56,0x90BCB6DE,0xEBFC7DA1,0xCE591D76,0x6F05E409,0x4B7C0188,
      0x39720A3D,0x7C927C24,0x86E3725F,0x724D9DB9,0x1AC15BB4,0xD39EB8FC,
      0xED545578,0x08FCA5B5,0xD83D7CD3,0x4DAD0FC4,0x1E50EF5E,0xB161E6F8,
      0xA28514D9,0x6C51133C,0x6FD5C7E7,0x56E14EC4,0x362ABFCE,0xDDC6C837,
      0xD79A3234,0x92638212,0x670EFA8E,0x406000E0
    }, {
      0x3A39CE37,0xD3FAF5CF,0xABC27737,0x5AC52D1B,0x5CB0679E,0x4FA33742,
      0xD3822740,0x99BC9BBE,0xD5118E9D,0xBF0F7315,0xD62D1C7E,0xC700C47B,
      0xB78C1B6B,0x21A19045,0xB26EB1BE,0x6A366EB4,0x5748AB2F,0xBC946E79,
      0xC6A376D2,0x6549C2C8,0x530FF8EE,0x468DDE7D,0xD5730A1D,0x4CD04DC6,
      0x2939BBDB,0xA9BA4650,0xAC9526E8,0xBE5EE304,0xA1FAD5F0,0x6A2D519A,
      0x63EF8CE2,0x9A86EE22,0xC089C2B8,0x43242EF6,0xA51E03AA,0x9CF2D0A4,
      0x83C061BA,0x9BE96A4D,0x8FE51550,0xBA645BD6,0x2826A2F9,0xA73A3AE1,
      0x4BA99586,0xEF5562E9,0xC72FEFD3,0xF752F7DA,0x3F046F69,0x77FA0A59,
      0x80E4A915,0x87B08601,0x9B09E6AD,0x3B3EE593,0xE990FD5A,0x9E34D797,
      0x2CF0B7D9,0x022B8B51,0x96D5AC3A,0x017DA67D,0xD1CF3ED6,0x7C7D2D28,
      0x1F9F25CF,0xADF2B89B,0x5AD6B472,0x5A88F54C,0xE029AC71,0xE019A5E6,
      0x47B0ACFD,0xED93FA9B,0xE8D3C48D,0x283B57CC,0xF8D56629,0x79132E28,
      0x785F0191,0xED756055,0xF7960E44,0xE3D35E8C,0x15056DD4,0x88F46DBA,
      0x03A16125,0x0564F0BD,0xC3EB9E15,0x3C9057A2,0x97271AEC,0xA93A072A,
      0x1B3F6D9B,0x1E6321F5,0xF59C66FB,0x26DCF319,0x7533D928,0xB155FDF5,
      0x03563482,0x8ABA3CBB,0x28517711,0xC20AD9F8,0xABCC5167,0xCCAD925F,
      0x4DE81751,0x3830DC8E,0x379D5862,0x9320F991,0xEA7A90C2,0xFB3E7BCE,
      0x5121CE64,0x774FBE32,0xA8B6E37E,0xC3293D46,0x48DE5369,0x6413E680,
      0xA2AE0810,0xDD6DB224,0x69852DFD,0x09072166,0xB39A460A,0x6445C0DD,
      0x586CDECF,0x1C20C8AE,0x5BBEF7DD,0x1B588D40,0xCCD2017F,0x6BB4E3BB,
      0xDDA26A7E,0x3A59FF45,0x3E350A44,0xBCB4CDD5,0x72EACEA8,0xFA6484BB,
      0x8D6612AE,0xBF3C6F47,0xD29BE463,0x542F5D9E,0xAEC2771B,0xF64E6370,
      0x740E0D8D,0xE75B1357,0xF8721671,0xAF537D5D,0x4040CB08,0x4EB4E2CC,
      0x34D2466A,0x0115AF84,0xE1B00428,0x95983A1D,0x06B89FB4,0xCE6EA048,
      0x6F3F3B82,0x3520AB82,0x011A1D4B,0x277227F8,0x611560B1,0xE7933FDC,
      0xBB3A792B,0x344525BD,0xA08839E1,0x51CE794B,0x2F32C9B7,0xA01FBAC9,
      0xE01CC87E,0xBCC7D1F6,0xCF0111C3,0xA1E8AAC7,0x1A908749,0xD44FBD9A,
      0xD0DADECB,0xD50ADA38,0x0339C32A,0xC6913667,0x8DF9317C,0xE0B12B4F,
      0xF79E59B7,0x43F5BB3A,0xF2D519FF,0x27D9459C,0xBF97222C,0x15E6FC2A,
      0x0F91FC71,0x9B941525,0xFAE59361,0xCEB69CEB,0xC2A86459,0x12BAA8D1,
      0xB6C1075E,0xE3056A0C,0x10D25065,0xCB03A442,0xE0EC6E0E,0x1698DB3B,
      0x4C98A0BE,0x3278E964,0x9F1F9532,0xE0D392DF,0xD3A0342B,0x8971F21E,
      0x1B0A7441,0x4BA3348C,0xC5BE7120,0xC37632D8,0xDF359F8D,0x9B992F2E,
      0xE60B6F47,0x0FE3F11D,0xE54CDA54,0x1EDAD891,0xCE6279CF,0xCD3E7E6F,
      0x1618B166,0xFD2C1D05,0x848FD2C5,0xF6FB2299,0xF523F357,0xA6327623,
      0x93A83531,0x56CCCD02,0xACF08162,0x5A75EBB5,0x6E163697,0x88D273CC,
      0xDE966292,0x81B949D0,0x4C50901B,0x71C65614,0xE6C6C7BD,0x327A140A,
      0x45E1D006,0xC3F27B9A,0xC9AA53FD,0x62A80F00,0xBB25BFE2,0x35BDD2F6,
      0x71126905,0xB2040222,0xB6CBCF7C,0xCD769C2B,0x53113EC0,0x1640E3D3,
      0x38ABBD60,0x2547ADF0,0xBA38209C,0xF746CE76,0x77AFA1C5,0x20756060,
      0x85CBFE4E,0x8AE88DD8,0x7AAAF9B0,0x4CF9AA7E,0x1948C25C,0x02FB8A8C,
      0x01C36AE4,0xD6EBE1F9,0x90D4F869,0xA65CDEA0,0x3F09252D,0xC208E69F,
      0xB74E6132,0xCE77E25B,0x578FDFE3,0x3AC372E6
    }
  },
  /* p constants */
  {
229 230
    0x243F6A88,0x85A308D3,0x13198A2E,0x03707344,0xA4093822,0x299F31D0,
    0x082EFA98,0xEC4E6C89,0x452821E6,0x38D01377,0xBE5466CF,0x34E90C6C,
231 232 233
    0xC0AC29B7,0xC97C50DD,0x3F84D5B5,0xB5470917,0x9216D5D9,0x8979FB1B
  },
};
234

235 236 237 238 239
/* It's unfortunate to have to pick the bytes apart in the round
 * function. Werner's GNUPG code stored took the address of x, and
 * then read the individual bytes depending on the endianness. But xr
 * and xl ought to live in registers, so I'm not sure that really is a
 * good way to do it. */
240

241 242 243
#define F(c, x) \
  ((( (c->s[0][(x>>24) &0xff] + c->s[1][(x>>16) & 0xff]) \
      ^ c->s[2][(x>>8) & 0xff]) + c->s[3][x & 0xff]) & 0xffffffff)
244

245
#define R(c, l, r, i)  do { l ^= c->p[i]; r ^= F(c, l); } while(0)
246 247

static void
248
encrypt(const struct blowfish_ctx *bc, uint32_t *ret_xl, uint32_t *ret_xr)
249
{
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275
  uint32_t xl, xr;

  xl = *ret_xl;
  xr = *ret_xr;
  R(bc,	xl, xr,  0);
  R(bc,	xr, xl,  1);
  R(bc,	xl, xr,  2);
  R(bc,	xr, xl,  3);
  R(bc,	xl, xr,  4);
  R(bc,	xr, xl,  5);
  R(bc,	xl, xr,  6);
  R(bc,	xr, xl,  7);
  R(bc,	xl, xr,  8);
  R(bc,	xr, xl,  9);
  R(bc,	xl, xr, 10);
  R(bc,	xr, xl, 11);
  R(bc,	xl, xr, 12);
  R(bc,	xr, xl, 13);
  R(bc,	xl, xr, 14);
  R(bc,	xr, xl, 15);

  xl ^= bc->p[_BLOWFISH_ROUNDS];
  xr ^= bc->p[_BLOWFISH_ROUNDS+1];

  *ret_xl = xr;
  *ret_xr = xl;
276 277 278
}

static void
279
decrypt(const struct blowfish_ctx *bc, uint32_t *ret_xl, uint32_t *ret_xr )
280
{
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307
  uint32_t xl, xr;

  xl = *ret_xl;
  xr = *ret_xr;

  R(bc,	xl, xr, 17);
  R(bc,	xr, xl, 16);
  R(bc,	xl, xr, 15);
  R(bc,	xr, xl, 14);
  R(bc,	xl, xr, 13);
  R(bc,	xr, xl, 12);
  R(bc,	xl, xr, 11);
  R(bc,	xr, xl, 10);
  R(bc,	xl, xr,  9);
  R(bc,	xr, xl,  8);
  R(bc,	xl, xr,  7);
  R(bc,	xr, xl,  6);
  R(bc,	xl, xr,  5);
  R(bc,	xr, xl,  4);
  R(bc,	xl, xr,  3);
  R(bc,	xr, xl,  2);

  xl ^= bc->p[1];
  xr ^= bc->p[0];

  *ret_xl = xr;
  *ret_xr = xl;
308 309 310 311 312
}

#undef F
#undef R

Niels Möller's avatar
Niels Möller committed
313
void
314
blowfish_encrypt(const struct blowfish_ctx *bc, unsigned length,
Niels Möller's avatar
Niels Möller committed
315
                 uint8_t *outbuf, const uint8_t *inbuf)
316
{
Niels Möller's avatar
Niels Möller committed
317
    uint32_t d1, d2;
318

319 320 321 322 323 324 325 326 327 328
    FOR_BLOCKS(length, outbuf, inbuf, BLOWFISH_BLOCK_SIZE)
      {
	d1 = READ_UINT32(inbuf);
	d2 = READ_UINT32(inbuf+ 4);

	encrypt( bc, &d1, &d2 );

	WRITE_UINT32(outbuf, d1);
	WRITE_UINT32(outbuf + 4, d2);
      }
329 330 331
}


Niels Möller's avatar
Niels Möller committed
332
void
333
blowfish_decrypt(const struct blowfish_ctx *bc, unsigned length,
334
                 uint8_t *outbuf, const uint8_t *inbuf )
335
{
Niels Möller's avatar
Niels Möller committed
336
    uint32_t d1, d2;
337

338 339 340 341 342 343 344 345 346 347
    FOR_BLOCKS(length, outbuf, inbuf, BLOWFISH_BLOCK_SIZE)
      {
	d1 = READ_UINT32(inbuf);
	d2 = READ_UINT32(inbuf+ 4);

	decrypt( bc, &d1, &d2 );

	WRITE_UINT32(outbuf, d1);
	WRITE_UINT32(outbuf + 4, d2);
      }
348 349
}

Niels Möller's avatar
Niels Möller committed
350
int
Niels Möller's avatar
Niels Möller committed
351
blowfish_set_key(struct blowfish_ctx *ctx,
352
                 unsigned keylen, const uint8_t *key)
353 354
{
    int i, j;
355
    uint32_t data, datal, datar;
Niels Möller's avatar
Niels Möller committed
356

357 358 359 360
    *ctx = initial_ctx;

    for(i=j=0; i < _BLOWFISH_ROUNDS+2; i++ )
      {
Niels Möller's avatar
Niels Möller committed
361 362
	data = key[j] << 24 | key[(j+1) % keylen] <<16
	  | key[(j+2)%keylen] << 8 | key[(j+3)%keylen];
363

Niels Möller's avatar
Niels Möller committed
364
	ctx->p[i] ^= data;
365
	j = (j+4) % keylen;
366
      }
367 368

    datal = datar = 0;
369 370
    for(i=0; i < _BLOWFISH_ROUNDS+2; i += 2 )
      {
Niels Möller's avatar
Niels Möller committed
371 372 373
	encrypt( ctx, &datal, &datar );
	ctx->p[i]   = datal;
	ctx->p[i+1] = datar;
374 375 376
      }
    for(i=0; i < 256; i += 2 )
      {
Niels Möller's avatar
Niels Möller committed
377
	encrypt( ctx, &datal, &datar );
378 379 380 381 382
	ctx->s[0][i]   = datal;
	ctx->s[0][i+1] = datar;
      }
    for(i=0; i < 256; i += 2 )
      {
Niels Möller's avatar
Niels Möller committed
383
	encrypt( ctx, &datal, &datar );
384 385 386 387 388
	ctx->s[1][i]   = datal;
	ctx->s[1][i+1] = datar;
      }
    for(i=0; i < 256; i += 2 )
      {
Niels Möller's avatar
Niels Möller committed
389
	encrypt( ctx, &datal, &datar );
390 391 392 393 394
	ctx->s[2][i]   = datal;
	ctx->s[2][i+1] = datar;
      }
    for(i=0; i < 256; i += 2 )
      {
Niels Möller's avatar
Niels Möller committed
395
	encrypt( ctx, &datal, &datar );
396 397 398
	ctx->s[3][i]   = datal;
	ctx->s[3][i+1] = datar;
      }
399 400 401

    /* Check for weak key.  A weak key is a key in which a value in */
    /* the P-array (here c) occurs more than once per table.	    */
402 403 404 405 406 407
    for(i=0; i < 255; i++ ) 
      for( j=i+1; j < 256; j++)
	if( (ctx->s[0][i] == ctx->s[0][j]) || (ctx->s[1][i] == ctx->s[1][j]) ||
	    (ctx->s[2][i] == ctx->s[2][j]) || (ctx->s[3][i] == ctx->s[3][j]) )
	  return 0;
    
408
    return 1;
409
}