/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)

/* $NetBSD: des_locl.h,v 1.6 2025/02/24 07:11:24 andvar Exp $ */
/* $KAME: des_locl.h,v 1.6 2000/11/06 13:58:09 itojun Exp $ */

/* crypto/des/des_locl.h */
/* Copyright (C) 1995-1997 Eric Young ([email protected])
* All rights reserved.
*
* This file is part of an SSL implementation written
* by Eric Young ([email protected]).
* The implementation was written so as to conform with Netscapes SSL
* specification. This library and applications are
* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
* as long as the following conditions are aheared to.
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed. If this code is used in a product,
* Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young ([email protected])
*
* 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 HEADER_DES_LOCL_H
#define HEADER_DES_LOCL_H

#include <crypto/des/des.h>

#undef DES_PTR

#ifdef __STDC__
#undef NOPROTO
#endif

#define ITERATIONS 16
#define HALF_ITERATIONS 8

/* used in des_read and des_write */
#define MAXWRITE (1024*16)
#define BSIZE (MAXWRITE+4)

#define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
l|=((DES_LONG)(*((c)++)))<< 8L, \
l|=((DES_LONG)(*((c)++)))<<16L, \
l|=((DES_LONG)(*((c)++)))<<24L)

/* NOTE - c is not incremented as per c2l */
#define c2ln(c,l1,l2,n) { \
c+=n; \
l1=l2=0; \
switch (n) { \
case 8: l2 =((DES_LONG)(*(--(c))))<<24L; /* FALLTHROUGH */\
case 7: l2|=((DES_LONG)(*(--(c))))<<16L; /* FALLTHROUGH */\
case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; /* FALLTHROUGH */\
case 5: l2|=((DES_LONG)(*(--(c)))); /* FALLTHROUGH */\
case 4: l1 =((DES_LONG)(*(--(c))))<<24L; /* FALLTHROUGH */\
case 3: l1|=((DES_LONG)(*(--(c))))<<16L; /* FALLTHROUGH */\
case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; /* FALLTHROUGH */\
case 1: l1|=((DES_LONG)(*(--(c)))); /* FALLTHROUGH */\
} \
}

#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
*((c)++)=(unsigned char)(((l)>>24L)&0xff))

/* replacements for htonl and ntohl since I have no idea what to do
* when faced with machines with 8 byte longs. */
#define HDRSIZE 4

#define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \
l|=((DES_LONG)(*((c)++)))<<16L, \
l|=((DES_LONG)(*((c)++)))<< 8L, \
l|=((DES_LONG)(*((c)++))))

#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
*((c)++)=(unsigned char)(((l) )&0xff))

/* NOTE - c is not incremented as per l2c */
#define l2cn(l1,l2,c,n) { \
c+=n; \
switch (n) { \
case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); /* FALLTHROUGH */\
case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); /* FALLTHROUGH */\
case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); /* FALLTHROUGH */\
case 5: *(--(c))=(unsigned char)(((l2) )&0xff); /* FALLTHROUGH */\
case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); /* FALLTHROUGH */\
case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); /* FALLTHROUGH */\
case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); /* FALLTHROUGH */\
case 1: *(--(c))=(unsigned char)(((l1) )&0xff); /* FALLTHROUGH */\
} \
}

#define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n))))

#define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
#define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
u=R^s[S ]; \
t=R^s[S+1]

/* The changes to this macro may help or hinder, depending on the
* compiler and the architecture. gcc2 always seems to do well :-).
* Inspired by Dana How <[email protected]>
* DO NOT use the alternative version on machines with 8 byte longs.
* It does not seem to work on the Alpha, even when DES_LONG is 4
* bytes, probably an issue of accessing non-word aligned objects :-( */
#ifdef DES_PTR

/* It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there
* is no reason to not xor all the sub items together. This potentially
* saves a register since things can be xored directly into L */

#if defined(DES_RISC1) || defined(DES_RISC2)
#ifdef DES_RISC1
#define D_ENCRYPT(LL,R,S) { \
unsigned int u1,u2,u3; \
LOAD_DATA(R,S,u,t,E0,E1,u1); \
u2=(int)u>>8L; \
u1=(int)u&0xfc; \
u2&=0xfc; \
t=ROTATE(t,4); \
u>>=16L; \
LL^= *(const DES_LONG *)(des_SP +u1); \
LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
u3=(int)(u>>8L); \
u1=(int)u&0xfc; \
u3&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x400+u1); \
LL^= *(const DES_LONG *)(des_SP+0x600+u3); \
u2=(int)t>>8L; \
u1=(int)t&0xfc; \
u2&=0xfc; \
t>>=16L; \
LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
u3=(int)t>>8L; \
u1=(int)t&0xfc; \
u3&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x500+u1); \
LL^= *(const DES_LONG *)(des_SP+0x700+u3); }
#endif /* DES_RISC1 */
#ifdef DES_RISC2
#define D_ENCRYPT(LL,R,S) { \
unsigned int u1,u2,s1,s2; \
LOAD_DATA(R,S,u,t,E0,E1,u1); \
u2=(int)u>>8L; \
u1=(int)u&0xfc; \
u2&=0xfc; \
t=ROTATE(t,4); \
LL^= *(const DES_LONG *)(des_SP +u1); \
LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
s1=(int)(u>>16L); \
s2=(int)(u>>24L); \
s1&=0xfc; \
s2&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x400+s1); \
LL^= *(const DES_LONG *)(des_SP+0x600+s2); \
u2=(int)t>>8L; \
u1=(int)t&0xfc; \
u2&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
s1=(int)(t>>16L); \
s2=(int)(t>>24L); \
s1&=0xfc; \
s2&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x400+s1); \
LL^= *(const DES_LONG *)(des_SP+0x600+s2); \
u2=(int)t>>8L; \
u1=(int)t&0xfc; \
u2&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
s1=(int)(t>>16L); \
s2=(int)(t>>24L); \
s1&=0xfc; \
s2&=0xfc; \
LL^= *(const DES_LONG *)(des_SP+0x500+s1); \
LL^= *(const DES_LONG *)(des_SP+0x700+s2); }
#endif /* DES_RISC2 */
#else /* DES_RISC1 || DES_RISC2 */
#define D_ENCRYPT(LL,R,S) { \
LOAD_DATA_tmp(R,S,u,t,E0,E1); \
t=ROTATE(t,4); \
LL^= \
*(const DES_LONG *)(des_SP +((u )&0xfc))^ \
*(const DES_LONG *)(des_SP+0x200+((u>> 8L)&0xfc))^ \
*(const DES_LONG *)(des_SP+0x400+((u>>16L)&0xfc))^ \
*(const DES_LONG *)(des_SP+0x600+((u>>24L)&0xfc))^ \
*(const DES_LONG *)(des_SP+0x100+((t )&0xfc))^ \
*(const DES_LONG *)(des_SP+0x300+((t>> 8L)&0xfc))^ \
*(const DES_LONG *)(des_SP+0x500+((t>>16L)&0xfc))^ \
*(const DES_LONG *)(des_SP+0x700+((t>>24L)&0xfc)); }
#endif /* DES_RISC1 || DES_RISC2 */
#else /* original version */

#if defined(DES_RISC1) || defined(DES_RISC2)
#ifdef DES_RISC1
#define D_ENCRYPT(LL,R,S) {\
unsigned int u1,u2,u3; \
LOAD_DATA(R,S,u,t,E0,E1,u1); \
u>>=2L; \
t=ROTATE(t,6); \
u2=(int)u>>8L; \
u1=(int)u&0x3f; \
u2&=0x3f; \
u>>=16L; \
LL^=des_SPtrans[0][u1]; \
LL^=des_SPtrans[2][u2]; \
u3=(int)u>>8L; \
u1=(int)u&0x3f; \
u3&=0x3f; \
LL^=des_SPtrans[4][u1]; \
LL^=des_SPtrans[6][u3]; \
u2=(int)t>>8L; \
u1=(int)t&0x3f; \
u2&=0x3f; \
t>>=16L; \
LL^=des_SPtrans[1][u1]; \
LL^=des_SPtrans[3][u2]; \
u3=(int)t>>8L; \
u1=(int)t&0x3f; \
u3&=0x3f; \
LL^=des_SPtrans[5][u1]; \
LL^=des_SPtrans[7][u3]; }
#endif /* DES_RISC1 */
#ifdef DES_RISC2
#define D_ENCRYPT(LL,R,S) {\
unsigned int u1,u2,s1,s2; \
LOAD_DATA(R,S,u,t,E0,E1,u1); \
u>>=2L; \
t=ROTATE(t,6); \
u2=(int)u>>8L; \
u1=(int)u&0x3f; \
u2&=0x3f; \
LL^=des_SPtrans[0][u1]; \
LL^=des_SPtrans[2][u2]; \
s1=(int)u>>16L; \
s2=(int)u>>24L; \
s1&=0x3f; \
s2&=0x3f; \
LL^=des_SPtrans[4][s1]; \
LL^=des_SPtrans[6][s2]; \
u2=(int)t>>8L; \
u1=(int)t&0x3f; \
u2&=0x3f; \
LL^=des_SPtrans[1][u1]; \
LL^=des_SPtrans[3][u2]; \
s1=(int)t>>16; \
s2=(int)t>>24L; \
s1&=0x3f; \
s2&=0x3f; \
LL^=des_SPtrans[5][s1]; \
LL^=des_SPtrans[7][s2]; }
#endif /* DES_RISC2 */

#else /* DES_RISC1 || DES_RISC2 */

#define D_ENCRYPT(LL,R,S) {\
LOAD_DATA_tmp(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]; }
#endif /* DES_RISC1 || DES_RISC2 */
#endif /* DES_PTR */

/* 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) ((t)=((((a)>>(n))^(b))&(m)),\
(b)^=(t),\
(a)^=((t)<<(n)))

#define IP(l,r) \
{ \
register DES_LONG 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); \
}

#define FP(l,r) \
{ \
register DES_LONG 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); \
}
#endif