239 lines
10 KiB
C
239 lines
10 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.] */
|
|
|
|
#ifndef OPENSSL_HEADER_DES_INTERNAL_H
|
|
#define OPENSSL_HEADER_DES_INTERNAL_H
|
|
|
|
#include <openssl/base.h>
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
#define c2l(c, l) \
|
|
do { \
|
|
(l) = ((uint32_t)(*((c)++))); \
|
|
(l) |= ((uint32_t)(*((c)++))) << 8L; \
|
|
(l) |= ((uint32_t)(*((c)++))) << 16L; \
|
|
(l) |= ((uint32_t)(*((c)++))) << 24L; \
|
|
} while (0)
|
|
|
|
#define l2c(l, c) \
|
|
do { \
|
|
*((c)++) = (unsigned char)(((l)) & 0xff); \
|
|
*((c)++) = (unsigned char)(((l) >> 8L) & 0xff); \
|
|
*((c)++) = (unsigned char)(((l) >> 16L) & 0xff); \
|
|
*((c)++) = (unsigned char)(((l) >> 24L) & 0xff); \
|
|
} while (0)
|
|
|
|
// NOTE - c is not incremented as per c2l
|
|
#define c2ln(c, l1, l2, n) \
|
|
do { \
|
|
(c) += (n); \
|
|
(l1) = (l2) = 0; \
|
|
switch (n) { \
|
|
case 8: \
|
|
(l2) = ((uint32_t)(*(--(c)))) << 24L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 7: \
|
|
(l2) |= ((uint32_t)(*(--(c)))) << 16L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 6: \
|
|
(l2) |= ((uint32_t)(*(--(c)))) << 8L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 5: \
|
|
(l2) |= ((uint32_t)(*(--(c)))); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 4: \
|
|
(l1) = ((uint32_t)(*(--(c)))) << 24L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 3: \
|
|
(l1) |= ((uint32_t)(*(--(c)))) << 16L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 2: \
|
|
(l1) |= ((uint32_t)(*(--(c)))) << 8L; \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 1: \
|
|
(l1) |= ((uint32_t)(*(--(c)))); \
|
|
} \
|
|
} while (0)
|
|
|
|
// NOTE - c is not incremented as per l2c
|
|
#define l2cn(l1, l2, c, n) \
|
|
do { \
|
|
(c) += (n); \
|
|
switch (n) { \
|
|
case 8: \
|
|
*(--(c)) = (unsigned char)(((l2) >> 24L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 7: \
|
|
*(--(c)) = (unsigned char)(((l2) >> 16L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 6: \
|
|
*(--(c)) = (unsigned char)(((l2) >> 8L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 5: \
|
|
*(--(c)) = (unsigned char)(((l2)) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 4: \
|
|
*(--(c)) = (unsigned char)(((l1) >> 24L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 3: \
|
|
*(--(c)) = (unsigned char)(((l1) >> 16L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 2: \
|
|
*(--(c)) = (unsigned char)(((l1) >> 8L) & 0xff); \
|
|
OPENSSL_FALLTHROUGH; \
|
|
case 1: \
|
|
*(--(c)) = (unsigned char)(((l1)) & 0xff); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* IP and FP
|
|
* The problem is more of a geometric problem that random bit fiddling.
|
|
0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
|
|
8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
|
|
16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
|
|
24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
|
|
|
|
32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
|
|
40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
|
|
48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
|
|
56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
|
|
|
|
The output has been subject to swaps of the form
|
|
0 1 -> 3 1 but the odd and even bits have been put into
|
|
2 3 2 0
|
|
different words. The main trick is to remember that
|
|
t=((l>>size)^r)&(mask);
|
|
r^=t;
|
|
l^=(t<<size);
|
|
can be used to swap and move bits between words.
|
|
|
|
So l = 0 1 2 3 r = 16 17 18 19
|
|
4 5 6 7 20 21 22 23
|
|
8 9 10 11 24 25 26 27
|
|
12 13 14 15 28 29 30 31
|
|
becomes (for size == 2 and mask == 0x3333)
|
|
t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
|
|
6^20 7^21 -- -- 4 5 20 21 6 7 22 23
|
|
10^24 11^25 -- -- 8 9 24 25 10 11 24 25
|
|
14^28 15^29 -- -- 12 13 28 29 14 15 28 29
|
|
|
|
Thanks for hints from Richard Outerbridge - he told me IP&FP
|
|
could be done in 15 xor, 10 shifts and 5 ands.
|
|
When I finally started to think of the problem in 2D
|
|
I first got ~42 operations without xors. When I remembered
|
|
how to use xors :-) I got it to its final state.
|
|
*/
|
|
#define PERM_OP(a, b, t, n, m) \
|
|
do { \
|
|
(t) = ((((a) >> (n)) ^ (b)) & (m)); \
|
|
(b) ^= (t); \
|
|
(a) ^= ((t) << (n)); \
|
|
} while (0)
|
|
|
|
#define IP(l, r) \
|
|
do { \
|
|
uint32_t tt; \
|
|
PERM_OP(r, l, tt, 4, 0x0f0f0f0fL); \
|
|
PERM_OP(l, r, tt, 16, 0x0000ffffL); \
|
|
PERM_OP(r, l, tt, 2, 0x33333333L); \
|
|
PERM_OP(l, r, tt, 8, 0x00ff00ffL); \
|
|
PERM_OP(r, l, tt, 1, 0x55555555L); \
|
|
} while (0)
|
|
|
|
#define FP(l, r) \
|
|
do { \
|
|
uint32_t tt; \
|
|
PERM_OP(l, r, tt, 1, 0x55555555L); \
|
|
PERM_OP(r, l, tt, 8, 0x00ff00ffL); \
|
|
PERM_OP(l, r, tt, 2, 0x33333333L); \
|
|
PERM_OP(r, l, tt, 16, 0x0000ffffL); \
|
|
PERM_OP(l, r, tt, 4, 0x0f0f0f0fL); \
|
|
} while (0)
|
|
|
|
#define LOAD_DATA(ks, R, S, u, t, E0, E1) \
|
|
do { \
|
|
(u) = (R) ^ (ks)->subkeys[S][0]; \
|
|
(t) = (R) ^ (ks)->subkeys[S][1]; \
|
|
} while (0)
|
|
|
|
#define D_ENCRYPT(ks, LL, R, S) \
|
|
do { \
|
|
LOAD_DATA(ks, R, S, u, t, E0, E1); \
|
|
t = ROTATE(t, 4); \
|
|
(LL) ^= \
|
|
DES_SPtrans[0][(u >> 2L) & 0x3f] ^ DES_SPtrans[2][(u >> 10L) & 0x3f] ^ \
|
|
DES_SPtrans[4][(u >> 18L) & 0x3f] ^ \
|
|
DES_SPtrans[6][(u >> 26L) & 0x3f] ^ DES_SPtrans[1][(t >> 2L) & 0x3f] ^ \
|
|
DES_SPtrans[3][(t >> 10L) & 0x3f] ^ \
|
|
DES_SPtrans[5][(t >> 18L) & 0x3f] ^ DES_SPtrans[7][(t >> 26L) & 0x3f]; \
|
|
} while (0)
|
|
|
|
#define ITERATIONS 16
|
|
#define HALF_ITERATIONS 8
|
|
|
|
#define ROTATE(a, n) (((a) >> (n)) + ((a) << (32 - (n))))
|
|
|
|
|
|
#if defined(__cplusplus)
|
|
} // extern C
|
|
#endif
|
|
|
|
#endif // OPENSSL_HEADER_DES_INTERNAL_H
|