Commit 671c3e17 authored by Niels Möller's avatar Niels Möller
Browse files

(SBOX1_INVERSE): Likewise.

Rev: nettle/serpent-decrypt.c:1.5
parent fe7695d1
......@@ -66,6 +66,7 @@
(GPL), although some comments in the code still say otherwise. You
are welcome to use Serpent for any application." */
/* S0 inverse: 13 3 11 0 10 6 5 12 1 14 4 7 15 9 8 2 */
/* Original single-assignment form:
t01 = x2 ^ x3;
......@@ -111,28 +112,47 @@
y0 ^= x1; \
} while (0)
/* S1 inverse: 5 8 2 14 15 6 12 3 11 4 7 9 1 13 10 0 */
/* Original single-assignment form:
t01 = x0 ^ x1;
t02 = x1 | x3;
t03 = x0 & x2;
t04 = x2 ^ t02;
t05 = x0 | t04;
t06 = t01 & t05;
t07 = x3 | t03;
t08 = x1 ^ t06;
t09 = t07 ^ t06;
t10 = t04 | t03;
t11 = x3 & t08;
y2 = ~ t09;
y1 = t10 ^ t11;
t14 = x0 | y2;
t15 = t06 ^ y1;
y3 = t01 ^ t04;
t17 = x2 ^ t15;
y0 = t14 ^ t17;
*/
#define SBOX1_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t05, t06, t07, t08; \
type t09, t10, t11, t14, t15, t17, t01; \
t01 = x0 ^ x1; \
t02 = x1 | x3; \
t03 = x0 & x2; \
t04 = x2 ^ t02; \
t05 = x0 | t04; \
t06 = t01 & t05; \
t07 = x3 | t03; \
t08 = x1 ^ t06; \
t09 = t07 ^ t06; \
t10 = t04 | t03; \
t11 = x3 & t08; \
y2 = ~ t09; \
y1 = t10 ^ t11; \
t14 = x0 | y2; \
t15 = t06 ^ y1; \
y3 = t01 ^ t04; \
t17 = x2 ^ t15; \
y0 = t14 ^ t17; \
do { \
y1 = x1 | x3; \
y1 ^= x2; \
y3 = x0 ^ x1; \
y0 = x0 | y1; \
y0 &= y3; \
x1 ^= y0; \
y3 ^= y1; \
x1 &= x3; \
y2 = x0 & x2; \
y1 |= y2; \
y2 |= x3; \
y2 ^= y0; \
y2 = ~ y2; \
y1 ^= x1; \
y0 ^= y1; \
y0 ^= x2; \
x0 |= y2; \
y0 ^= x0; \
} while (0)
#define SBOX2_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
......
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