--- /dev/null
+/* 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>
+
+#include "../../internal.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
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