1 /* 2 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #ifndef OSSL_CRYPTO_DES_LOCAL_H 11 # define OSSL_CRYPTO_DES_LOCAL_H 12 13 # include <openssl/e_os2.h> 14 15 # include <stdio.h> 16 # include <stdlib.h> 17 # include <string.h> 18 19 # include <openssl/des.h> 20 21 # ifdef OPENSSL_BUILD_SHLIBCRYPTO 22 # undef OPENSSL_EXTERN 23 # define OPENSSL_EXTERN OPENSSL_EXPORT 24 # endif 25 26 # define ITERATIONS 16 27 # define HALF_ITERATIONS 8 28 29 # define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \ 30 l|=((DES_LONG)(*((c)++)))<< 8L, \ 31 l|=((DES_LONG)(*((c)++)))<<16L, \ 32 l|=((DES_LONG)(*((c)++)))<<24L) 33 34 /* NOTE - c is not incremented as per c2l */ 35 # define c2ln(c,l1,l2,n) { \ 36 c+=n; \ 37 l1=l2=0; \ 38 switch (n) { \ 39 case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \ 40 /* fall through */ \ 41 case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \ 42 /* fall through */ \ 43 case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \ 44 /* fall through */ \ 45 case 5: l2|=((DES_LONG)(*(--(c)))); \ 46 /* fall through */ \ 47 case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \ 48 /* fall through */ \ 49 case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \ 50 /* fall through */ \ 51 case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \ 52 /* fall through */ \ 53 case 1: l1|=((DES_LONG)(*(--(c)))); \ 54 } \ 55 } 56 57 # define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ 58 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ 59 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ 60 *((c)++)=(unsigned char)(((l)>>24L)&0xff)) 61 62 /* NOTE - c is not incremented as per l2c */ 63 # define l2cn(l1,l2,c,n) { \ 64 c+=n; \ 65 switch (n) { \ 66 case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \ 67 /* fall through */ \ 68 case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \ 69 /* fall through */ \ 70 case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \ 71 /* fall through */ \ 72 case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \ 73 /* fall through */ \ 74 case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \ 75 /* fall through */ \ 76 case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \ 77 /* fall through */ \ 78 case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \ 79 /* fall through */ \ 80 case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \ 81 } \ 82 } 83 84 # if defined(_MSC_VER) 85 # define ROTATE(a,n) (_lrotr(a,n)) 86 # elif defined(__ICC) 87 # define ROTATE(a,n) (_rotr(a,n)) 88 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC) 89 # if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) 90 # define ROTATE(a,n) ({ register unsigned int ret; \ 91 asm ("rorl %1,%0" \ 92 : "=r"(ret) \ 93 : "I"(n),"0"(a) \ 94 : "cc"); \ 95 ret; \ 96 }) 97 # elif defined(__riscv_zbb) || defined(__riscv_zbkb) 98 # if __riscv_xlen == 64 99 # define ROTATE(x, n) ({ register unsigned int ret; \ 100 asm ("roriw %0, %1, %2" \ 101 : "=r"(ret) \ 102 : "r"(x), "i"(n)); ret; }) 103 # endif 104 # if __riscv_xlen == 32 105 # define ROTATE(x, n) ({ register unsigned int ret; \ 106 asm ("rori %0, %1, %2" \ 107 : "=r"(ret) \ 108 : "r"(x), "i"(n)); ret; }) 109 # endif 110 # endif 111 # endif 112 # ifndef ROTATE 113 # define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n)))) 114 # endif 115 116 /* 117 * Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add 118 * it's little bit to the front 119 */ 120 121 # ifdef DES_FCRYPT 122 123 # define LOAD_DATA_tmp(R,S,u,t,E0,E1) \ 124 { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); } 125 126 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 127 t=R^(R>>16L); \ 128 u=t&E0; t&=E1; \ 129 tmp=(u<<16); u^=R^s[S ]; u^=tmp; \ 130 tmp=(t<<16); t^=R^s[S+1]; t^=tmp 131 # else 132 # define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g) 133 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 134 u=R^s[S ]; \ 135 t=R^s[S+1] 136 # endif 137 138 /* 139 * It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason 140 * to not xor all the sub items together. This potentially saves a register 141 * since things can be xored directly into L 142 */ 143 144 # define D_ENCRYPT(LL,R,S) { \ 145 LOAD_DATA_tmp(R,S,u,t,E0,E1); \ 146 t=ROTATE(t,4); \ 147 LL^= \ 148 DES_SPtrans[0][(u>> 2L)&0x3f]^ \ 149 DES_SPtrans[2][(u>>10L)&0x3f]^ \ 150 DES_SPtrans[4][(u>>18L)&0x3f]^ \ 151 DES_SPtrans[6][(u>>26L)&0x3f]^ \ 152 DES_SPtrans[1][(t>> 2L)&0x3f]^ \ 153 DES_SPtrans[3][(t>>10L)&0x3f]^ \ 154 DES_SPtrans[5][(t>>18L)&0x3f]^ \ 155 DES_SPtrans[7][(t>>26L)&0x3f]; } 156 157 /*- 158 * IP and FP 159 * The problem is more of a geometric problem that random bit fiddling. 160 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 161 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 162 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 163 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 164 165 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 166 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 167 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 168 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 169 170 The output has been subject to swaps of the form 171 0 1 -> 3 1 but the odd and even bits have been put into 172 2 3 2 0 173 different words. The main trick is to remember that 174 t=((l>>size)^r)&(mask); 175 r^=t; 176 l^=(t<<size); 177 can be used to swap and move bits between words. 178 179 So l = 0 1 2 3 r = 16 17 18 19 180 4 5 6 7 20 21 22 23 181 8 9 10 11 24 25 26 27 182 12 13 14 15 28 29 30 31 183 becomes (for size == 2 and mask == 0x3333) 184 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 185 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 186 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 187 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 188 189 Thanks for hints from Richard Outerbridge - he told me IP&FP 190 could be done in 15 xor, 10 shifts and 5 ands. 191 When I finally started to think of the problem in 2D 192 I first got ~42 operations without xors. When I remembered 193 how to use xors :-) I got it to its final state. 194 */ 195 # define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 196 (b)^=(t),\ 197 (a)^=((t)<<(n))) 198 199 # define IP(l,r) \ 200 { \ 201 register DES_LONG tt; \ 202 PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \ 203 PERM_OP(l,r,tt,16,0x0000ffffL); \ 204 PERM_OP(r,l,tt, 2,0x33333333L); \ 205 PERM_OP(l,r,tt, 8,0x00ff00ffL); \ 206 PERM_OP(r,l,tt, 1,0x55555555L); \ 207 } 208 209 # define FP(l,r) \ 210 { \ 211 register DES_LONG tt; \ 212 PERM_OP(l,r,tt, 1,0x55555555L); \ 213 PERM_OP(r,l,tt, 8,0x00ff00ffL); \ 214 PERM_OP(l,r,tt, 2,0x33333333L); \ 215 PERM_OP(r,l,tt,16,0x0000ffffL); \ 216 PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \ 217 } 218 219 extern const DES_LONG DES_SPtrans[8][64]; 220 221 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, 222 DES_LONG Eswap0, DES_LONG Eswap1); 223 224 #endif 225
