sha3: tweak comments and indentation

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/hash_md5_sha.c b/libbb/hash_md5_sha.c
index 4cef2aba10173380637d45258b00b195f6392181..1f63ccdeed917fcf092e3dd1185bfc9deef843f3 100644 (file)
--- a/libbb/hash_md5_sha.c
+++ b/libbb/hash_md5_sha.c
@@ -1174,12 +1174,13 @@ static void sha3_process_block72(uint64_t *state)
 
        combine_halves(state);
 #else
-       /* Elements should be 64-bit, but top half is always zero or 0x80000000.
-        * We encode 63rd bits in a separate word below.
-        * Same is true for 31th bits, which lets us use 16-bit table instead of 64-bit.
-        * The speed penalty is lost in the noise.
-        */
+       /* Native 64-bit algorithm */
        static const uint16_t IOTA_CONST[NROUNDS] = {
+               /* Elements should be 64-bit, but top half is always zero
+                * or 0x80000000. We encode 63rd bits in a separate word below.
+                * Same is true for 31th bits, which lets us use 16-bit table
+                * instead of 64-bit. The speed penalty is lost in the noise.
+                */
                0x0001,
                0x8082,
                0x808a,
@@ -1283,7 +1284,7 @@ static void sha3_process_block72(uint64_t *state)
 #undef RhoPi_twice
                }
                /* Chi */
-#if LONG_MAX > 0x7fffffff
+# if LONG_MAX > 0x7fffffff
                for (x = 0; x <= 20; x += 5) {
                        uint64_t BC0, BC1, BC2, BC3, BC4;
                        BC0 = state[x + 0];
@@ -1297,7 +1298,7 @@ static void sha3_process_block72(uint64_t *state)
                        state[x + 3] = BC3 ^ ((~BC4) & BC0);
                        state[x + 4] = BC4 ^ ((~BC0) & BC1);
                }
-#else
+# else
                /* Reduced register pressure version
                 * for register-starved 32-bit arches
                 * (i386: -95 bytes, and it is _faster_)
@@ -1305,9 +1306,9 @@ static void sha3_process_block72(uint64_t *state)
                for (x = 0; x <= 40;) {
                        uint32_t BC0, BC1, BC2, BC3, BC4;
                        uint32_t *const s32 = (uint32_t*)state;
-# if SHA3_SMALL
+#  if SHA3_SMALL
  do_half:
-#endif
+#  endif
                        BC0 = s32[x + 0*2];
                        BC1 = s32[x + 1*2];
                        BC2 = s32[x + 2*2];
@@ -1319,11 +1320,11 @@ static void sha3_process_block72(uint64_t *state)
                        s32[x + 3*2] = BC3 ^ ((~BC4) & BC0);
                        s32[x + 4*2] = BC4 ^ ((~BC0) & BC1);
                        x++;
-# if SHA3_SMALL
+#  if SHA3_SMALL
                        if (x & 1)
                                goto do_half;
                        x += 8;
-# else
+#  else
                        BC0 = s32[x + 0*2];
                        BC1 = s32[x + 1*2];
                        BC2 = s32[x + 2*2];
@@ -1335,9 +1336,9 @@ static void sha3_process_block72(uint64_t *state)
                        s32[x + 3*2] = BC3 ^ ((~BC4) & BC0);
                        s32[x + 4*2] = BC4 ^ ((~BC0) & BC1);
                        x += 9;
-# endif
+#  endif
                }
-#endif
+# endif /* long is 32-bit */
                /* Iota */
                state[0] ^= IOTA_CONST[round]
                        | (uint32_t)((IOTA_CONST_bit31 << round) & 0x80000000)