/*
* DES and 3DES-EDE ciphers
*
* Modifications to LibTomCrypt implementation:
* Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto.h"
#include "des_i.h"
/*
* This implementation is based on a DES implementation included in
* LibTomCrypt. The version here is modified to fit in wpa_supplicant/hostapd
* coding style.
*/
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
*/
/**
DES code submitted by Dobes Vandermeer
*/
#define ROLc(x, y) \
((((unsigned long) (x) << (unsigned long) ((y) & 31)) | \
(((unsigned long) (x) & 0xFFFFFFFFUL) >> \
(unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL)
#define RORc(x, y) \
(((((unsigned long) (x) & 0xFFFFFFFFUL) >> \
(unsigned long) ((y) & 31)) | \
((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & \
0xFFFFFFFFUL)
static const u32 bytebit[8] =
{
0200, 0100, 040, 020, 010, 04, 02, 01
};
static const u32 bigbyte[24] =
{
0x800000UL, 0x400000UL, 0x200000UL, 0x100000UL,
0x80000UL, 0x40000UL, 0x20000UL, 0x10000UL,
0x8000UL, 0x4000UL, 0x2000UL, 0x1000UL,
0x800UL, 0x400UL, 0x200UL, 0x100UL,
0x80UL, 0x40UL, 0x20UL, 0x10UL,
0x8UL, 0x4UL, 0x2UL, 0x1L
};
/* Use the key schedule specific in the standard (ANSI X3.92-1981) */
static const u8 pc1[56] = {
56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
};
static const u8 totrot[16] = {
1, 2, 4, 6,
8, 10, 12, 14,
15, 17, 19, 21,
23, 25, 27, 28
};
static const u8 pc2[48] = {
13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
};
static const u32 SP1[64] =
{
0x01010400UL, 0x00000000UL, 0x00010000UL, 0x01010404UL,
0x01010004UL, 0x00010404UL, 0x00000004UL, 0x00010000UL,
0x00000400UL, 0x01010400UL, 0x01010404UL, 0x00000400UL,
0x01000404UL, 0x01010004UL, 0x01000000UL, 0x00000004UL,
0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00010400UL,
0x00010400UL, 0x01010000UL, 0x01010000UL, 0x01000404UL,
0x00010004UL, 0x01000004UL, 0x01000004UL, 0x00010004UL,
0x00000000UL, 0x00000404UL, 0x00010404UL, 0x01000000UL,
0x00010000UL, 0x01010404UL, 0x00000004UL, 0x01010000UL,
0x01010400UL, 0x01000000UL, 0x01000000UL, 0x00000400UL,
0x01010004UL, 0x00010000UL, 0x00010400UL, 0x01000004UL,
0x00000400UL, 0x00000004UL, 0x01000404UL, 0x00010404UL,
0x01010404UL, 0x00010004UL, 0x01010000UL, 0x01000404UL,
0x01000004UL, 0x00000404UL, 0x00010404UL, 0x01010400UL,
0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00000000UL,
0x00010004UL, 0x00010400UL, 0x00000000UL, 0x01010004UL
};
static const u32 SP2[64] =
{
0x80108020UL, 0x80008000UL, 0x00008000UL, 0x00108020UL,
0x00100000UL, 0x00000020UL, 0x80100020UL, 0x80008020UL,
0x80000020UL, 0x80108020UL, 0x80108000UL, 0x80000000UL,
0x80008000UL, 0x00100000UL, 0x00000020UL, 0x80100020UL,
0x00108000UL, 0x00100020UL, 0x80008020UL, 0x00000000UL,
0x80000000UL, 0x00008000UL, 0x00108020UL, 0x80100000UL,
0x00100020UL, 0x80000020UL, 0x00000000UL, 0x00108000UL,
0x00008020UL, 0x80108000UL, 0x80100000UL, 0x00008020UL,
0x00000000UL, 0x00108020UL, 0x80100020UL, 0x00100000UL,
0x80008020UL, 0x80100000UL, 0x80108000UL, 0x00008000UL,
0x80100000UL, 0x80008000UL, 0x00000020UL, 0x80108020UL,
0x00108020UL, 0x00000020UL, 0x00008000UL, 0x80000000UL,
0x00008020UL, 0x80108000UL, 0x00100000UL, 0x80000020UL,
0x00100020UL, 0x80008020UL, 0x80000020UL, 0x00100020UL,
0x00108000UL, 0x00000000UL, 0x80008000UL, 0x00008020UL,
0x80000000UL, 0x80100020UL, 0x80108020UL, 0x00108000UL
};
static const u32 SP3[64] =
{
0x00000208UL, 0x08020200UL, 0x00000000UL, 0x08020008UL,
0x08000200UL, 0x00000000UL, 0x00020208UL, 0x08000200UL,
0x00020008UL, 0x08000008UL, 0x08000008UL, 0x00020000UL,
0x08020208UL, 0x00020008UL, 0x08020000UL, 0x00000208UL,
0x08000000UL, 0x00000008UL, 0x08020200UL, 0x00000200UL,
0x00020200UL, 0x08020000UL, 0x08020008UL, 0x00020208UL,
0x08000208UL, 0x00020200UL, 0x00020000UL, 0x08000208UL,
0x00000008UL, 0x08020208UL, 0x00000200UL, 0x08000000UL,
0x08020200UL, 0x08000000UL, 0x00020008UL, 0x00000208UL,
0x00020000UL, 0x08020200UL, 0x08000200UL, 0x00000000UL,
0x00000200UL, 0x00020008UL, 0x08020208UL, 0x08000200UL,
0x08000008UL, 0x00000200UL, 0x00000000UL, 0x08020008UL,
0x08000208UL, 0x00020000UL, 0x08000000UL, 0x08020208UL,
0x00000008UL, 0x00020208UL, 0x00020200UL, 0x08000008UL,
0x08020000UL, 0x08000208UL, 0x00000208UL, 0x08020000UL,
0x00020208UL, 0x00000008UL, 0x08020008UL, 0x00020200UL
};
static const u32 SP4[64] =
{
0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
0x00802080UL, 0x00800081UL, 0x00800001UL, 0x00002001UL,
0x00000000UL, 0x00802000UL, 0x00802000UL, 0x00802081UL,
0x00000081UL, 0x00000000UL, 0x00800080UL, 0x00800001UL,
0x00000001UL, 0x00002000UL, 0x00800000UL, 0x00802001UL,
0x00000080UL, 0x00800000UL, 0x00002001UL, 0x00002080UL,
0x00800081UL, 0x00000001UL, 0x00002080UL, 0x00800080UL,
0x00002000UL, 0x00802080UL, 0x00802081UL, 0x00000081UL,
0x00800080UL, 0x00800001UL, 0x00802000UL, 0x00802081UL,
0x00000081UL, 0x00000000UL, 0x00000000UL, 0x00802000UL,
0x00002080UL, 0x00800080UL, 0x00800081UL, 0x00000001UL,
0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
0x00802081UL, 0x00000081UL, 0x00000001UL, 0x00002000UL,
0x00800001UL, 0x00002001UL, 0x00802080UL, 0x00800081UL,
0x00002001UL, 0x00002080UL, 0x00800000UL, 0x00802001UL,
0x00000080UL, 0x00800000UL, 0x00002000UL, 0x00802080UL
};
static const u32 SP5[64] =
{
0x00000100UL, 0x02080100UL, 0x02080000UL, 0x42000100UL,
0x00080000UL, 0x00000100UL, 0x40000000UL, 0x02080000UL,
0x40080100UL, 0x00080000UL, 0x02000100UL, 0x40080100UL,
0x42000100UL, 0x42080000UL, 0x00080100UL, 0x40000000UL,
0x02000000UL, 0x40080000UL, 0x40080000UL, 0x00000000UL,
0x40000100UL, 0x42080100UL, 0x42080100UL, 0x02000100UL,
0x42080000UL, 0x40000100UL, 0x00000000UL, 0x42000000UL,
0x02080100UL, 0x02000000UL, 0x42000000UL, 0x00080100UL,
0x00080000UL, 0x42000100UL, 0x00000100UL, 0x02000000UL,
0x40000000UL, 0x02080000UL, 0x42000100UL, 0x40080100UL,
0x02000100UL, 0x40000000UL, 0x42080000UL, 0x02080100UL,
0x40080100UL, 0x00000100UL, 0x02000000UL, 0x42080000UL,
0x42080100UL, 0x00080100UL, 0x42000000UL, 0x42080100UL,
0x02080000UL, 0x00000000UL, 0x40080000UL, 0x42000000UL,
0x00080100UL, 0x02000100UL, 0x40000100UL, 0x00080000UL,
0x00000000UL, 0x40080000UL, 0x02080100UL, 0x40000100UL
};
static const u32 SP6[64] =
{
0x20000010UL, 0x20400000UL, 0x00004000UL, 0x20404010UL,
0x20400000UL, 0x00000010UL, 0x20404010UL, 0x00400000UL,
0x20004000UL, 0x00404010UL, 0x00400000UL, 0x20000010UL,
0x00400010UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
0x00000000UL, 0x00400010UL, 0x20004010UL, 0x00004000UL,
0x00404000UL, 0x20004010UL, 0x00000010UL, 0x20400010UL,
0x20400010UL, 0x00000000UL, 0x00404010UL, 0x20404000UL,
0x00004010UL, 0x00404000UL, 0x20404000UL, 0x20000000UL,
0x20004000UL, 0x00000010UL, 0x20400010UL, 0x00404000UL,
0x20404010UL, 0x00400000UL, 0x00004010UL, 0x20000010UL,
0x00400000UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
0x20000010UL, 0x20404010UL, 0x00404000UL, 0x20400000UL,
0x00404010UL, 0x20404000UL, 0x00000000UL, 0x20400010UL,
0x00000010UL, 0x00004000UL, 0x20400000UL, 0x00404010UL,
0x00004000UL, 0x00400010UL, 0x20004010UL, 0x00000000UL,
0x20404000UL, 0x20000000UL, 0x00400010UL, 0x20004010UL
};
static const u32 SP7[64] =
{
0x00200000UL, 0x04200002UL, 0x04000802UL, 0x00000000UL,
0x00000800UL, 0x04000802UL, 0x00200802UL, 0x04200800UL,
0x04200802UL, 0x00200000UL, 0x00000000UL, 0x04000002UL,
0x00000002UL, 0x04000000UL, 0x04200002UL, 0x00000802UL,
0x04000800UL, 0x00200802UL, 0x00200002UL, 0x04000800UL,
0x04000002UL, 0x04200000UL, 0x04200800UL, 0x00200002UL,
0x04200000UL, 0x00000800UL, 0x00000802UL, 0x04200802UL,
0x00200800UL, 0x00000002UL, 0x04000000UL, 0x00200800UL,
0x04000000UL, 0x00200800UL, 0x00200000UL, 0x04000802UL,
0x04000802UL, 0x04200002UL, 0x04200002UL, 0x00000002UL,
0x00200002UL, 0x04000000UL, 0x04000800UL, 0x00200000UL,
0x04200800UL, 0x00000802UL, 0x00200802UL, 0x04200800UL,
0x00000802UL, 0x04000002UL, 0x04200802UL, 0x04200000UL,
0x00200800UL, 0x00000000UL, 0x00000002UL, 0x04200802UL,
0x00000000UL, 0x00200802UL, 0x04200000UL, 0x00000800UL,
0x04000002UL, 0x04000800UL, 0x00000800UL, 0x00200002UL
};
static const u32 SP8[64] =
{
0x10001040UL, 0x00001000UL, 0x00040000UL, 0x10041040UL,
0x10000000UL, 0x10001040UL, 0x00000040UL, 0x10000000UL,
0x00040040UL, 0x10040000UL, 0x10041040UL, 0x00041000UL,
0x10041000UL, 0x00041040UL, 0x00001000UL, 0x00000040UL,
0x10040000UL, 0x10000040UL, 0x10001000UL, 0x00001040UL,
0x00041000UL, 0x00040040UL, 0x10040040UL, 0x10041000UL,
0x00001040UL, 0x00000000UL, 0x00000000UL, 0x10040040UL,
0x10000040UL, 0x10001000UL, 0x00041040UL, 0x00040000UL,
0x00041040UL, 0x00040000UL, 0x10041000UL, 0x00001000UL,
0x00000040UL, 0x10040040UL, 0x00001000UL, 0x00041040UL,
0x10001000UL, 0x00000040UL, 0x10000040UL, 0x10040000UL,
0x10040040UL, 0x10000000UL, 0x00040000UL, 0x10001040UL,
0x00000000UL, 0x10041040UL, 0x00040040UL, 0x10000040UL,
0x10040000UL, 0x10001000UL, 0x10001040UL, 0x00000000UL,
0x10041040UL, 0x00041000UL, 0x00041000UL, 0x00001040UL,
0x00001040UL, 0x00040040UL, 0x10000000UL, 0x10041000UL
};
static void cookey(const u32 *raw1, u32 *keyout)
{
u32 *cook;
const u32 *raw0;
u32 dough[32];
int i;
cook = dough;
for (i = 0; i < 16; i++, raw1++) {
raw0 = raw1++;
*cook = (*raw0 & 0x00fc0000L) << 6;
*cook |= (*raw0 & 0x00000fc0L) << 10;
*cook |= (*raw1 & 0x00fc0000L) >> 10;
*cook++ |= (*raw1 & 0x00000fc0L) >> 6;
*cook = (*raw0 & 0x0003f000L) << 12;
*cook |= (*raw0 & 0x0000003fL) << 16;
*cook |= (*raw1 & 0x0003f000L) >> 4;
*cook++ |= (*raw1 & 0x0000003fL);
}
os_memcpy(keyout, dough, sizeof(dough));
}
static void deskey(const u8 *key, int decrypt, u32 *keyout)
{
u32 i, j, l, m, n, kn[32];
u8 pc1m[56], pcr[56];
for (j = 0; j < 56; j++) {
l = (u32) pc1[j];
m = l & 7;
pc1m[j] = (u8)
((key[l >> 3U] & bytebit[m]) == bytebit[m] ? 1 : 0);
}
for (i = 0; i < 16; i++) {
if (decrypt)
m = (15 - i) << 1;
else
m = i << 1;
n = m + 1;
kn[m] = kn[n] = 0L;
for (j = 0; j < 28; j++) {
l = j + (u32) totrot[i];
if (l < 28)
pcr[j] = pc1m[l];
else
pcr[j] = pc1m[l - 28];
}
for (/* j = 28 */; j < 56; j++) {
l = j + (u32) totrot[i];
if (l < 56)
pcr[j] = pc1m[l];
else
pcr[j] = pc1m[l - 28];
}
for (j = 0; j < 24; j++) {
if ((int) pcr[(int) pc2[j]] != 0)
kn[m] |= bigbyte[j];
if ((int) pcr[(int) pc2[j + 24]] != 0)
kn[n] |= bigbyte[j];
}
}
cookey(kn, keyout);
}
static void desfunc(u32 *block, const u32 *keys)
{
u32 work, right, leftt;
int cur_round;
leftt = block[0];
right = block[1];
work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
right ^= work;
leftt ^= (work << 4);
work = ((leftt >> 16) ^ right) & 0x0000ffffL;
right ^= work;
leftt ^= (work << 16);
work = ((right >> 2) ^ leftt) & 0x33333333L;
leftt ^= work;
right ^= (work << 2);
work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
leftt ^= work;
right ^= (work << 8);
right = ROLc(right, 1);
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = ROLc(leftt, 1);
for (cur_round = 0; cur_round < 8; cur_round++) {
work = RORc(right, 4) ^ *keys++;
leftt ^= SP7[work & 0x3fL]
^ SP5[(work >> 8) & 0x3fL]
^ SP3[(work >> 16) & 0x3fL]
^ SP1[(work >> 24) & 0x3fL];
work = right ^ *keys++;
leftt ^= SP8[ work & 0x3fL]
^ SP6[(work >> 8) & 0x3fL]
^ SP4[(work >> 16) & 0x3fL]
^ SP2[(work >> 24) & 0x3fL];
work = RORc(leftt, 4) ^ *keys++;
right ^= SP7[ work & 0x3fL]
^ SP5[(work >> 8) & 0x3fL]
^ SP3[(work >> 16) & 0x3fL]
^ SP1[(work >> 24) & 0x3fL];
work = leftt ^ *keys++;
right ^= SP8[ work & 0x3fL]
^ SP6[(work >> 8) & 0x3fL]
^ SP4[(work >> 16) & 0x3fL]
^ SP2[(work >> 24) & 0x3fL];
}
right = RORc(right, 1);
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = RORc(leftt, 1);
work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
right ^= work;
leftt ^= (work << 8);
/* -- */
work = ((leftt >> 2) ^ right) & 0x33333333L;
right ^= work;
leftt ^= (work << 2);
work = ((right >> 16) ^ leftt) & 0x0000ffffL;
leftt ^= work;
right ^= (work << 16);
work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
leftt ^= work;
right ^= (work << 4);
block[0] = right;
block[1] = leftt;
}
/* wpa_supplicant/hostapd specific wrapper */
int des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
{
u8 pkey[8], next, tmp;
int i;
u32 ek[32], work[2];
/* Add parity bits to the key */
next = 0;
for (i = 0; i < 7; i++) {
tmp = key[i];
pkey[i] = (tmp >> i) | next | 1;
next = tmp << (7 - i);
}
pkey[i] = next | 1;
deskey(pkey, 0, ek);
work[0] = WPA_GET_BE32(clear);
work[1] = WPA_GET_BE32(clear + 4);
desfunc(work, ek);
WPA_PUT_BE32(cypher, work[0]);
WPA_PUT_BE32(cypher + 4, work[1]);
os_memset(pkey, 0, sizeof(pkey));
os_memset(ek, 0, sizeof(ek));
return 0;
}
void des_key_setup(const u8 *key, u32 *ek, u32 *dk)
{
deskey(key, 0, ek);
deskey(key, 1, dk);
}
void des_block_encrypt(const u8 *plain, const u32 *ek, u8 *crypt)
{
u32 work[2];
work[0] = WPA_GET_BE32(plain);
work[1] = WPA_GET_BE32(plain + 4);
desfunc(work, ek);
WPA_PUT_BE32(crypt, work[0]);
WPA_PUT_BE32(crypt + 4, work[1]);
}
void des_block_decrypt(const u8 *crypt, const u32 *dk, u8 *plain)
{
u32 work[2];
work[0] = WPA_GET_BE32(crypt);
work[1] = WPA_GET_BE32(crypt + 4);
desfunc(work, dk);
WPA_PUT_BE32(plain, work[0]);
WPA_PUT_BE32(plain + 4, work[1]);
}
void des3_key_setup(const u8 *key, struct des3_key_s *dkey)
{
deskey(key, 0, dkey->ek[0]);
deskey(key + 8, 1, dkey->ek[1]);
deskey(key + 16, 0, dkey->ek[2]);
deskey(key, 1, dkey->dk[2]);
deskey(key + 8, 0, dkey->dk[1]);
deskey(key + 16, 1, dkey->dk[0]);
}
void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt)
{
u32 work[2];
work[0] = WPA_GET_BE32(plain);
work[1] = WPA_GET_BE32(plain + 4);
desfunc(work, key->ek[0]);
desfunc(work, key->ek[1]);
desfunc(work, key->ek[2]);
WPA_PUT_BE32(crypt, work[0]);
WPA_PUT_BE32(crypt + 4, work[1]);
}
void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain)
{
u32 work[2];
work[0] = WPA_GET_BE32(crypt);
work[1] = WPA_GET_BE32(crypt + 4);
desfunc(work, key->dk[0]);
desfunc(work, key->dk[1]);
desfunc(work, key->dk[2]);
WPA_PUT_BE32(plain, work[0]);
WPA_PUT_BE32(plain + 4, work[1]);
}