2015-09-24 20:52:02 +00:00
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#ifndef OPENSSL_HEADER_DES_INTERNAL_H
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#define OPENSSL_HEADER_DES_INTERNAL_H
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#include <openssl/base.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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2018-07-30 02:07:02 +00:00
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#define c2l(c, l) \
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do { \
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(l) = ((uint32_t)(*((c)++))); \
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(l) |= ((uint32_t)(*((c)++))) << 8L; \
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(l) |= ((uint32_t)(*((c)++))) << 16L; \
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(l) |= ((uint32_t)(*((c)++))) << 24L; \
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} while (0)
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#define l2c(l, c) \
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do { \
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*((c)++) = (unsigned char)(((l)) & 0xff); \
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*((c)++) = (unsigned char)(((l) >> 8L) & 0xff); \
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*((c)++) = (unsigned char)(((l) >> 16L) & 0xff); \
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*((c)++) = (unsigned char)(((l) >> 24L) & 0xff); \
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} while (0)
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// NOTE - c is not incremented as per c2l
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#define c2ln(c, l1, l2, n) \
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do { \
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(c) += (n); \
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(l1) = (l2) = 0; \
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switch (n) { \
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case 8: \
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(l2) = ((uint32_t)(*(--(c)))) << 24L; \
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OPENSSL_FALLTHROUGH; \
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case 7: \
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(l2) |= ((uint32_t)(*(--(c)))) << 16L; \
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OPENSSL_FALLTHROUGH; \
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case 6: \
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(l2) |= ((uint32_t)(*(--(c)))) << 8L; \
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OPENSSL_FALLTHROUGH; \
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case 5: \
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(l2) |= ((uint32_t)(*(--(c)))); \
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OPENSSL_FALLTHROUGH; \
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case 4: \
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(l1) = ((uint32_t)(*(--(c)))) << 24L; \
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OPENSSL_FALLTHROUGH; \
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case 3: \
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(l1) |= ((uint32_t)(*(--(c)))) << 16L; \
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OPENSSL_FALLTHROUGH; \
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case 2: \
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(l1) |= ((uint32_t)(*(--(c)))) << 8L; \
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OPENSSL_FALLTHROUGH; \
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case 1: \
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(l1) |= ((uint32_t)(*(--(c)))); \
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} \
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} while (0)
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// NOTE - c is not incremented as per l2c
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#define l2cn(l1, l2, c, n) \
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do { \
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(c) += (n); \
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2015-09-24 20:52:02 +00:00
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switch (n) { \
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case 8: \
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*(--(c)) = (unsigned char)(((l2) >> 24L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 7: \
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*(--(c)) = (unsigned char)(((l2) >> 16L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 6: \
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*(--(c)) = (unsigned char)(((l2) >> 8L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 5: \
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*(--(c)) = (unsigned char)(((l2)) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 4: \
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*(--(c)) = (unsigned char)(((l1) >> 24L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 3: \
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*(--(c)) = (unsigned char)(((l1) >> 16L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 2: \
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*(--(c)) = (unsigned char)(((l1) >> 8L) & 0xff); \
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OPENSSL_FALLTHROUGH; \
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2015-09-24 20:52:02 +00:00
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case 1: \
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*(--(c)) = (unsigned char)(((l1)) & 0xff); \
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} \
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2018-07-30 02:07:02 +00:00
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} while (0)
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2015-09-24 20:52:02 +00:00
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/* IP and FP
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* The problem is more of a geometric problem that random bit fiddling.
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0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
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8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
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16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
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24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
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32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
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40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
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48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
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56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
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The output has been subject to swaps of the form
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0 1 -> 3 1 but the odd and even bits have been put into
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2 3 2 0
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different words. The main trick is to remember that
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t=((l>>size)^r)&(mask);
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r^=t;
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l^=(t<<size);
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can be used to swap and move bits between words.
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So l = 0 1 2 3 r = 16 17 18 19
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4 5 6 7 20 21 22 23
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8 9 10 11 24 25 26 27
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12 13 14 15 28 29 30 31
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becomes (for size == 2 and mask == 0x3333)
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t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
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6^20 7^21 -- -- 4 5 20 21 6 7 22 23
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10^24 11^25 -- -- 8 9 24 25 10 11 24 25
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14^28 15^29 -- -- 12 13 28 29 14 15 28 29
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Thanks for hints from Richard Outerbridge - he told me IP&FP
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could be done in 15 xor, 10 shifts and 5 ands.
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When I finally started to think of the problem in 2D
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I first got ~42 operations without xors. When I remembered
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how to use xors :-) I got it to its final state.
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*/
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2018-07-30 02:07:02 +00:00
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#define PERM_OP(a, b, t, n, m) \
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do { \
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(t) = ((((a) >> (n)) ^ (b)) & (m)); \
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(b) ^= (t); \
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(a) ^= ((t) << (n)); \
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} while (0)
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2015-09-24 20:52:02 +00:00
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#define IP(l, r) \
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do { \
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uint32_t tt; \
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PERM_OP(r, l, tt, 4, 0x0f0f0f0fL); \
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PERM_OP(l, r, tt, 16, 0x0000ffffL); \
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PERM_OP(r, l, tt, 2, 0x33333333L); \
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PERM_OP(l, r, tt, 8, 0x00ff00ffL); \
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PERM_OP(r, l, tt, 1, 0x55555555L); \
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} while (0)
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#define FP(l, r) \
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do { \
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uint32_t tt; \
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PERM_OP(l, r, tt, 1, 0x55555555L); \
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PERM_OP(r, l, tt, 8, 0x00ff00ffL); \
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PERM_OP(l, r, tt, 2, 0x33333333L); \
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PERM_OP(r, l, tt, 16, 0x0000ffffL); \
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PERM_OP(l, r, tt, 4, 0x0f0f0f0fL); \
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} while (0)
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#define LOAD_DATA(ks, R, S, u, t, E0, E1) \
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do { \
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(u) = (R) ^ (ks)->subkeys[S][0]; \
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(t) = (R) ^ (ks)->subkeys[S][1]; \
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} while (0)
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#define D_ENCRYPT(ks, LL, R, S) \
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do { \
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LOAD_DATA(ks, R, S, u, t, E0, E1); \
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t = ROTATE(t, 4); \
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(LL) ^= \
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DES_SPtrans[0][(u >> 2L) & 0x3f] ^ DES_SPtrans[2][(u >> 10L) & 0x3f] ^ \
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DES_SPtrans[4][(u >> 18L) & 0x3f] ^ \
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DES_SPtrans[6][(u >> 26L) & 0x3f] ^ DES_SPtrans[1][(t >> 2L) & 0x3f] ^ \
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DES_SPtrans[3][(t >> 10L) & 0x3f] ^ \
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DES_SPtrans[5][(t >> 18L) & 0x3f] ^ DES_SPtrans[7][(t >> 26L) & 0x3f]; \
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} while (0)
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2015-09-24 20:52:02 +00:00
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#define ITERATIONS 16
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#define HALF_ITERATIONS 8
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#define ROTATE(a, n) (((a) >> (n)) + ((a) << (32 - (n))))
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#if defined(__cplusplus)
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} // extern C
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2015-09-24 20:52:02 +00:00
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#endif
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2018-07-30 02:07:02 +00:00
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#endif // OPENSSL_HEADER_DES_INTERNAL_H
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