+# 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]; }
+
+ /*-
+ * 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); \
+ }
+
+extern const DES_LONG DES_SPtrans[8][64];
+
+void fcrypt_body(DES_LONG *out, DES_key_schedule *ks,
+ DES_LONG Eswap0, DES_LONG Eswap1);