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225 lines
8.9 KiB
C
225 lines
8.9 KiB
C
/*
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* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_CRYPTO_DES_LOCAL_H
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# define OSSL_CRYPTO_DES_LOCAL_H
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# include <openssl/e_os2.h>
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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# include <openssl/des.h>
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# ifdef OPENSSL_BUILD_SHLIBCRYPTO
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# undef OPENSSL_EXTERN
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# define OPENSSL_EXTERN OPENSSL_EXPORT
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# endif
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# define ITERATIONS 16
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# define HALF_ITERATIONS 8
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# define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
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l|=((DES_LONG)(*((c)++)))<< 8L, \
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l|=((DES_LONG)(*((c)++)))<<16L, \
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l|=((DES_LONG)(*((c)++)))<<24L)
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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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c+=n; \
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l1=l2=0; \
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switch (n) { \
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case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
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/* fall through */ \
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case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
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/* fall through */ \
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case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
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/* fall through */ \
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case 5: l2|=((DES_LONG)(*(--(c)))); \
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/* fall through */ \
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case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
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/* fall through */ \
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case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
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/* fall through */ \
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case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
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/* fall through */ \
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case 1: l1|=((DES_LONG)(*(--(c)))); \
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} \
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}
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# define l2c(l,c) (*((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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/* NOTE - c is not incremented as per l2c */
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# define l2cn(l1,l2,c,n) { \
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c+=n; \
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switch (n) { \
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case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
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/* fall through */ \
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case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
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/* fall through */ \
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case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
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/* fall through */ \
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case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
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/* fall through */ \
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case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
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/* fall through */ \
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case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
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/* fall through */ \
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case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
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/* fall through */ \
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case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
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} \
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}
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# if defined(_MSC_VER)
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# define ROTATE(a,n) (_lrotr(a,n))
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# elif defined(__ICC)
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# define ROTATE(a,n) (_rotr(a,n))
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# elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)
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# if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)
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# define ROTATE(a,n) ({ register unsigned int ret; \
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asm ("rorl %1,%0" \
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: "=r"(ret) \
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: "I"(n),"0"(a) \
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: "cc"); \
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ret; \
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})
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# elif defined(__riscv_zbb) || defined(__riscv_zbkb)
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# if __riscv_xlen == 64
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# define ROTATE(x, n) ({ register unsigned int ret; \
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asm ("roriw %0, %1, %2" \
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: "=r"(ret) \
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: "r"(x), "i"(n)); ret; })
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# endif
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# if __riscv_xlen == 32
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# define ROTATE(x, n) ({ register unsigned int ret; \
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asm ("rori %0, %1, %2" \
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: "=r"(ret) \
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: "r"(x), "i"(n)); ret; })
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# endif
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# endif
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# endif
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# ifndef ROTATE
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# define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n))))
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# endif
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/*
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* Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add
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* it's little bit to the front
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*/
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# ifdef DES_FCRYPT
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# define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
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{ DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
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# define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
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t=R^(R>>16L); \
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u=t&E0; t&=E1; \
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tmp=(u<<16); u^=R^s[S ]; u^=tmp; \
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tmp=(t<<16); t^=R^s[S+1]; t^=tmp
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# else
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# define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
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# define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
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u=R^s[S ]; \
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t=R^s[S+1]
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# endif
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/*
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* It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason
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* to not xor all the sub items together. This potentially saves a register
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* since things can be xored directly into L
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*/
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# define D_ENCRYPT(LL,R,S) { \
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LOAD_DATA_tmp(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]^ \
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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]^ \
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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]^ \
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DES_SPtrans[7][(t>>26L)&0x3f]; }
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/*-
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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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# define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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(b)^=(t),\
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(a)^=((t)<<(n)))
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# define IP(l,r) \
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{ \
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register DES_LONG 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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}
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# define FP(l,r) \
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{ \
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register DES_LONG 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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}
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extern const DES_LONG DES_SPtrans[8][64];
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void fcrypt_body(DES_LONG *out, DES_key_schedule *ks,
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DES_LONG Eswap0, DES_LONG Eswap1);
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#endif
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