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| author | Niels Möller <nisse@lysator.liu.se> | 2011-06-21 23:08:18 +0200 |
|---|---|---|
| committer | Niels Möller <nisse@lysator.liu.se> | 2011-06-21 23:08:18 +0200 |
| commit | a1da2a5541af390b4e4284a8d6b8f3fb3f2c2028 (patch) | |
| tree | 26a66a361310954c39ea6cdbde79f48b168b9b37 /serpent-decrypt.c | |
| parent | d912689e1c177ef0026cbbf4b28ffa1eb444ab2a (diff) | |
| download | nettle-a1da2a5541af390b4e4284a8d6b8f3fb3f2c2028.tar.gz | |
(SBOX7_INVERSE): Eliminated temporaries.
Rev: nettle/serpent-decrypt.c:1.10
Diffstat (limited to 'serpent-decrypt.c')
| -rw-r--r-- | serpent-decrypt.c | 40 |
1 files changed, 19 insertions, 21 deletions
diff --git a/serpent-decrypt.c b/serpent-decrypt.c index a5f33996..d7f761f8 100644 --- a/serpent-decrypt.c +++ b/serpent-decrypt.c @@ -388,27 +388,25 @@ y2 = t14 ^ t16; */ #define SBOX7_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \ - do { \ - type t02, t03, t04, t06, t07, t08, t09; \ - type t10, t11, t13, t14, t15, t16, t01; \ - t01 = x0 & x1; \ - t02 = x0 | x1; \ - t03 = x2 | t01; \ - t04 = x3 & t02; \ - y3 = t03 ^ t04; \ - t06 = x1 ^ t04; \ - t07 = x3 ^ y3; \ - t08 = ~ t07; \ - t09 = t06 | t08; \ - t10 = x1 ^ x3; \ - t11 = x0 | x3; \ - y1 = x0 ^ t09; \ - t13 = x2 ^ t06; \ - t14 = x2 & t11; \ - t15 = x3 | y1; \ - t16 = t01 | t10; \ - y0 = t13 ^ t15; \ - y2 = t14 ^ t16; \ + do { \ + y3 = x0 & x1; \ + y2 = x1 ^ x3; \ + y2 |= y3; \ + y1 = x0 | x3; \ + y1 &= x2; \ + y2 ^= y1; \ + y3 |= x2; \ + y0 = x0 | x1; \ + y0 &= x3; \ + y3 ^= y0; \ + y0 ^= x1; \ + y1 = x3 ^ y3; \ + y1 = ~ y1; \ + y1 |= y0; \ + y0 ^= x2; \ + y1 ^= x0; \ + x3 |= y1; \ + y0 ^= x3; \ } while (0) /* In-place inverse linear transformation. */ |