📄 sflcryp.c
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#define D_ENCRYPT(L,R,S) \ u=((R^s[S])<<2); \ t= R^s[S+1]; \ t=((t>>2)+(t<<30)); \ L^= \ *(LPDWORD)(des_SP+0x0100+((t )&0xfc))+ \ *(LPDWORD)(des_SP+0x0300+((t>> 8)&0xfc))+ \ *(LPDWORD)(des_SP+0x0500+((t>>16)&0xfc))+ \ *(LPDWORD)(des_SP+0x0700+((t>>24)&0xfc))+ \ *(LPDWORD)(des_SP+ ((u )&0xfc))+ \ *(LPDWORD)(des_SP+0x0200+((u>> 8)&0xfc))+ \ *(LPDWORD)(des_SP+0x0400+((u>>16)&0xfc))+ \ *(LPDWORD)(des_SP+0x0600+((u>>24)&0xfc));#else /* original version */#define D_ENCRYPT(L,R,S) \ u = (R^s [S]); \ t = R^s [S + 1]; \ t = ((t >> 4) + (t << 28)); \ L^= des_SPtrans[1][(word) (t ) & 0x3f]| \ des_SPtrans[3][(word) (t>> 8) & 0x3f]| \ des_SPtrans[5][(word) (t>>16) & 0x3f]| \ des_SPtrans[7][(word) (t>>24) & 0x3f]| \ des_SPtrans[0][(word) (u ) & 0x3f]| \ des_SPtrans[2][(word) (u>> 8) & 0x3f]| \ des_SPtrans[4][(word) (u>>16) & 0x3f]| \ des_SPtrans[6][(word) (u>>24) & 0x3f];#endif /* 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 ITERATIONS 16#define HPERM_OP(a,t,n,m) \ ((t) = ((((a) << (16 - (n))) ^ (a)) & (m)),\ (a) = (a) ^ (t) ^ (t >> (16 - (n))))qbyte des_SPtrans [8][64] = { /* nibble 0 */ { 0x00820200L, 0x00020000L, 0x80800000L, 0x80820200L, 0x00800000L, 0x80020200L, 0x80020000L, 0x80800000L, 0x80020200L, 0x00820200L, 0x00820000L, 0x80000200L, 0x80800200L, 0x00800000L, 0x00000000L, 0x80020000L, 0x00020000L, 0x80000000L, 0x00800200L, 0x00020200L, 0x80820200L, 0x00820000L, 0x80000200L, 0x00800200L, 0x80000000L, 0x00000200L, 0x00020200L, 0x80820000L, 0x00000200L, 0x80800200L, 0x80820000L, 0x00000000L, 0x00000000L, 0x80820200L, 0x00800200L, 0x80020000L, 0x00820200L, 0x00020000L, 0x80000200L, 0x00800200L, 0x80820000L, 0x00000200L, 0x00020200L, 0x80800000L, 0x80020200L, 0x80000000L, 0x80800000L, 0x00820000L, 0x80820200L, 0x00020200L, 0x00820000L, 0x80800200L, 0x00800000L, 0x80000200L, 0x80020000L, 0x00000000L, 0x00020000L, 0x00800000L, 0x80800200L, 0x00820200L, 0x80000000L, 0x80820000L, 0x00000200L, 0x80020200L }, /* nibble 1 */ { 0x10042004L, 0x00000000L, 0x00042000L, 0x10040000L, 0x10000004L, 0x00002004L, 0x10002000L, 0x00042000L, 0x00002000L, 0x10040004L, 0x00000004L, 0x10002000L, 0x00040004L, 0x10042000L, 0x10040000L, 0x00000004L, 0x00040000L, 0x10002004L, 0x10040004L, 0x00002000L, 0x00042004L, 0x10000000L, 0x00000000L, 0x00040004L, 0x10002004L, 0x00042004L, 0x10042000L, 0x10000004L, 0x10000000L, 0x00040000L, 0x00002004L, 0x10042004L, 0x00040004L, 0x10042000L, 0x10002000L, 0x00042004L, 0x10042004L, 0x00040004L, 0x10000004L, 0x00000000L, 0x10000000L, 0x00002004L, 0x00040000L, 0x10040004L, 0x00002000L, 0x10000000L, 0x00042004L, 0x10002004L, 0x10042000L, 0x00002000L, 0x00000000L, 0x10000004L, 0x00000004L, 0x10042004L, 0x00042000L, 0x10040000L, 0x10040004L, 0x00040000L, 0x00002004L, 0x10002000L, 0x10002004L, 0x00000004L, 0x10040000L, 0x00042000L }, /* nibble 2 */ { 0x41000000L, 0x01010040L, 0x00000040L, 0x41000040L, 0x40010000L, 0x01000000L, 0x41000040L, 0x00010040L, 0x01000040L, 0x00010000L, 0x01010000L, 0x40000000L, 0x41010040L, 0x40000040L, 0x40000000L, 0x41010000L, 0x00000000L, 0x40010000L, 0x01010040L, 0x00000040L, 0x40000040L, 0x41010040L, 0x00010000L, 0x41000000L, 0x41010000L, 0x01000040L, 0x40010040L, 0x01010000L, 0x00010040L, 0x00000000L, 0x01000000L, 0x40010040L, 0x01010040L, 0x00000040L, 0x40000000L, 0x00010000L, 0x40000040L, 0x40010000L, 0x01010000L, 0x41000040L, 0x00000000L, 0x01010040L, 0x00010040L, 0x41010000L, 0x40010000L, 0x01000000L, 0x41010040L, 0x40000000L, 0x40010040L, 0x41000000L, 0x01000000L, 0x41010040L, 0x00010000L, 0x01000040L, 0x41000040L, 0x00010040L, 0x01000040L, 0x00000000L, 0x41010000L, 0x40000040L, 0x41000000L, 0x40010040L, 0x00000040L, 0x01010000L }, /* nibble 3 */ { 0x00100402L, 0x04000400L, 0x00000002L, 0x04100402L, 0x00000000L, 0x04100000L, 0x04000402L, 0x00100002L, 0x04100400L, 0x04000002L, 0x04000000L, 0x00000402L, 0x04000002L, 0x00100402L, 0x00100000L, 0x04000000L, 0x04100002L, 0x00100400L, 0x00000400L, 0x00000002L, 0x00100400L, 0x04000402L, 0x04100000L, 0x00000400L, 0x00000402L, 0x00000000L, 0x00100002L, 0x04100400L, 0x04000400L, 0x04100002L, 0x04100402L, 0x00100000L, 0x04100002L, 0x00000402L, 0x00100000L, 0x04000002L, 0x00100400L, 0x04000400L, 0x00000002L, 0x04100000L, 0x04000402L, 0x00000000L, 0x00000400L, 0x00100002L, 0x00000000L, 0x04100002L, 0x04100400L, 0x00000400L, 0x04000000L, 0x04100402L, 0x00100402L, 0x00100000L, 0x04100402L, 0x00000002L, 0x04000400L, 0x00100402L, 0x00100002L, 0x00100400L, 0x04100000L, 0x04000402L, 0x00000402L, 0x04000000L, 0x04000002L, 0x04100400L }, /* nibble 4 */ { 0x02000000L, 0x00004000L, 0x00000100L, 0x02004108L, 0x02004008L, 0x02000100L, 0x00004108L, 0x02004000L, 0x00004000L, 0x00000008L, 0x02000008L, 0x00004100L, 0x02000108L, 0x02004008L, 0x02004100L, 0x00000000L, 0x00004100L, 0x02000000L, 0x00004008L, 0x00000108L, 0x02000100L, 0x00004108L, 0x00000000L, 0x02000008L, 0x00000008L, 0x02000108L, 0x02004108L, 0x00004008L, 0x02004000L, 0x00000100L, 0x00000108L, 0x02004100L, 0x02004100L, 0x02000108L, 0x00004008L, 0x02004000L, 0x00004000L, 0x00000008L, 0x02000008L, 0x02000100L, 0x02000000L, 0x00004100L, 0x02004108L, 0x00000000L, 0x00004108L, 0x02000000L, 0x00000100L, 0x00004008L, 0x02000108L, 0x00000100L, 0x00000000L, 0x02004108L, 0x02004008L, 0x02004100L, 0x00000108L, 0x00004000L, 0x00004100L, 0x02004008L, 0x02000100L, 0x00000108L, 0x00000008L, 0x00004108L, 0x02004000L, 0x02000008L }, /* nibble 5 */ { 0x20000010L, 0x00080010L, 0x00000000L, 0x20080800L, 0x00080010L, 0x00000800L, 0x20000810L, 0x00080000L, 0x00000810L, 0x20080810L, 0x00080800L, 0x20000000L, 0x20000800L, 0x20000010L, 0x20080000L, 0x00080810L, 0x00080000L, 0x20000810L, 0x20080010L, 0x00000000L, 0x00000800L, 0x00000010L, 0x20080800L, 0x20080010L, 0x20080810L, 0x20080000L, 0x20000000L, 0x00000810L, 0x00000010L, 0x00080800L, 0x00080810L, 0x20000800L, 0x00000810L, 0x20000000L, 0x20000800L, 0x00080810L, 0x20080800L, 0x00080010L, 0x00000000L, 0x20000800L, 0x20000000L, 0x00000800L, 0x20080010L, 0x00080000L, 0x00080010L, 0x20080810L, 0x00080800L, 0x00000010L, 0x20080810L, 0x00080800L, 0x00080000L, 0x20000810L, 0x20000010L, 0x20080000L, 0x00080810L, 0x00000000L, 0x00000800L, 0x20000010L, 0x20000810L, 0x20080800L, 0x20080000L, 0x00000810L, 0x00000010L, 0x20080010L }, /* nibble 6 */ { 0x00001000L, 0x00000080L, 0x00400080L, 0x00400001L, 0x00401081L, 0x00001001L, 0x00001080L, 0x00000000L, 0x00400000L, 0x00400081L, 0x00000081L, 0x00401000L, 0x00000001L, 0x00401080L, 0x00401000L, 0x00000081L, 0x00400081L, 0x00001000L, 0x00001001L, 0x00401081L, 0x00000000L, 0x00400080L, 0x00400001L, 0x00001080L, 0x00401001L, 0x00001081L, 0x00401080L, 0x00000001L, 0x00001081L, 0x00401001L, 0x00000080L, 0x00400000L, 0x00001081L, 0x00401000L, 0x00401001L, 0x00000081L, 0x00001000L, 0x00000080L, 0x00400000L, 0x00401001L, 0x00400081L, 0x00001081L, 0x00001080L, 0x00000000L, 0x00000080L, 0x00400001L, 0x00000001L, 0x00400080L, 0x00000000L, 0x00400081L, 0x00400080L, 0x00001080L, 0x00000081L, 0x00001000L, 0x00401081L, 0x00400000L, 0x00401080L, 0x00000001L, 0x00001001L, 0x00401081L, 0x00400001L, 0x00401080L, 0x00401000L, 0x00001001L }, /* nibble 7 */ { 0x08200020L, 0x08208000L, 0x00008020L, 0x00000000L, 0x08008000L, 0x00200020L, 0x08200000L, 0x08208020L, 0x00000020L, 0x08000000L, 0x00208000L, 0x00008020L, 0x00208020L, 0x08008020L, 0x08000020L, 0x08200000L, 0x00008000L, 0x00208020L, 0x00200020L, 0x08008000L, 0x08208020L, 0x08000020L, 0x00000000L, 0x00208000L, 0x08000000L, 0x00200000L, 0x08008020L, 0x08200020L, 0x00200000L, 0x00008000L, 0x08208000L, 0x00000020L, 0x00200000L, 0x00008000L, 0x08000020L, 0x08208020L, 0x00008020L, 0x08000000L, 0x00000000L, 0x00208000L, 0x08200020L, 0x08008020L, 0x08008000L, 0x00200020L, 0x08208000L, 0x00000020L, 0x00200020L, 0x08008000L, 0x08208020L, 0x00200000L, 0x08200000L, 0x08000020L, 0x00208000L, 0x00008020L, 0x08008020L, 0x08200000L, 0x00000020L, 0x08208000L, 0x00208020L, 0x00000000L, 0x08000000L, 0x08200020L, 0x00008000L, 0x00208020L } };qbyte des_skb [8][64] = { /* For C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ { 0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L, 0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L, 0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L, 0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L, 0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L, 0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L, 0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L, 0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L, 0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L, 0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L, 0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L, 0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L, 0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L, 0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L, 0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L, 0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L }, /* For C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */ { 0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L, 0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L, 0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L, 0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L, 0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L, 0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L, 0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L, 0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L, 0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L, 0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L, 0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L, 0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L, 0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L, 0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L, 0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L, 0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L }, /* For C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */ { 0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L, 0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L, 0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L, 0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L, 0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L, 0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L, 0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L, 0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L, 0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L, 0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L, 0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L, 0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L, 0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L, 0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L, 0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L, 0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L }, /* For C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */ { 0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L, 0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L, 0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L, 0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L, 0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L, 0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L, 0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L, 0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L, 0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L, 0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L, 0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L, 0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L, 0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L, 0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L, 0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L, 0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L }, /* For D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ { 0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L, 0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L, 0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L, 0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L, 0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L, 0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L, 0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L, 0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L, 0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L, 0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L, 0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L, 0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L, 0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L, 0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L, 0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L, 0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L }, /* For D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */ { 0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L, 0x00000400L, 0x08000400L, 0x00000408L, 0x08000408L, 0x00020000L, 0x08020000L, 0x00020008L, 0x08020008L, 0x00020400L, 0x08020400L, 0x00020408L, 0x08020408L, 0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L, 0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L, 0x00020001L, 0x08020001L, 0x00020009L, 0x08020009L, 0x00020401L, 0x08020401L, 0x00020409L, 0x08020409L, 0x02000000L, 0x0A000000L, 0x02000008L, 0x0A000008L, 0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L, 0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L, 0x02020400L, 0x0A020400L, 0x02020408L, 0x0A020408L, 0x02000001L, 0x0A000001L, 0x02000009L, 0x0A000009L, 0x02000401L, 0x0A000401L, 0x02000409L, 0x0A000409L, 0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L, 0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L }, /* For D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */ { 0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L, 0x01000000L, 0x01000100L, 0x01080000L, 0x01080100L, 0x00000010L, 0x00000110L, 0x00080010L, 0x00080110L, 0x01000010L, 0x01000110L, 0x01080010L, 0x01080110L, 0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L, 0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L, 0x00200010L, 0x00200110L, 0x00280010L, 0x00280110L, 0x01200010L, 0x01200110L, 0x01280010L, 0x01280110L, 0x00000200L, 0x00000300L, 0x00080200L, 0x00080300L, 0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L, 0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L, 0x01000210L, 0x01000310L, 0x01080210L, 0x01080310L, 0x00200200L, 0x00200300L, 0x00280200L, 0x00280300L, 0x01200200L, 0x01200300L, 0x01280200L, 0x01280300L, 0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L, 0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L }, /* For D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */ { 0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L, 0x00000002L, 0x04000002L, 0x00040002L, 0x04040002L, 0x00002000L, 0x04002000L, 0x00042000L, 0x04042000L, 0x00002002L, 0x04002002L, 0x00042002L, 0x04042002L, 0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L, 0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L,
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