Commit fe7695d1 authored by Niels Möller's avatar Niels Möller

Comment fix.

Rev: nettle/serpent-encrypt.c:1.13
parent aecde8cd
......@@ -66,10 +66,6 @@
(GPL), although some comments in the code still say otherwise. You
are welcome to use Serpent for any application." */
/* FIXME: Except when used within the key schedule, the inputs are not
used after the substitution, and hence we could allow them to be
destroyed. Can this freedom be used to optimize the sboxes? */
/* S0: 3 8 15 1 10 6 5 11 14 13 4 2 7 0 9 12 */
/* Could easily let y0, y1 overlap with x0, x1, and possibly also x2 and y2 */
#define SBOX0(x0, x1, x2, x3, y0, y1, y2, y3) \
......@@ -98,24 +94,24 @@
/* S1: 15 12 2 7 9 0 5 10 1 11 14 8 6 13 3 4 */
/* Original single-assignment form:
t01 = x0 | x3; 0
t02 = x2 ^ x3; 0
t03 = ~ x1; 0
t04 = x0 ^ x2; 0
t05 = x0 | t03; 0
t06 = x3 & t04; 0
t07 = t01 & t02; 0
t08 = x1 | t06; 0
y2 = t02 ^ t05; 0
t10 = t07 ^ t08; 0
t11 = t01 ^ t10; 0
t12 = y2 ^ t11; 0
t13 = x1 & x3; 0
t01 = x0 | x3;
t02 = x2 ^ x3;
t03 = ~ x1;
t04 = x0 ^ x2;
t05 = x0 | t03;
t06 = x3 & t04;
t07 = t01 & t02;
t08 = x1 | t06;
y2 = t02 ^ t05;
t10 = t07 ^ t08;
t11 = t01 ^ t10;
t12 = y2 ^ t11;
t13 = x1 & x3;
y3 = ~ t10;
y1 = t13 ^ t12; 0
t16 = t10 | y1; 0
t17 = t05 & t16; 0
y0 = x2 ^ t17; 0
y1 = t13 ^ t12;
t16 = t10 | y1;
t17 = t05 & t16;
y0 = x2 ^ t17;
*/
#define SBOX1(x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
......
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