Commit 6337d17d authored by Niels Möller's avatar Niels Möller
Browse files

(SBOX3_INVERSE): Eliminated temporaries.

(SBOX4_INVERSE): Likewise.

Rev: nettle/serpent-decrypt.c:1.7
parent 05117bb3
......@@ -198,52 +198,108 @@
y2 ^= x2; \
} while (0)
/* S3 inverse: 0 9 10 7 11 14 6 13 3 5 12 2 4 8 15 1 */
/* Original single-assignment form:
t01 = x2 | x3;
t02 = x0 | x3;
t03 = x2 ^ t02;
t04 = x1 ^ t02;
t05 = x0 ^ x3;
t06 = t04 & t03;
t07 = x1 & t01;
y2 = t05 ^ t06;
t09 = x0 ^ t03;
y0 = t07 ^ t03;
t11 = y0 | t05;
t12 = t09 & t11;
t13 = x0 & y2;
t14 = t01 ^ t05;
y1 = x1 ^ t12;
t16 = x1 | t13;
y3 = t14 ^ t16;
*/
#define SBOX3_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t05, t06, t07, t09; \
type t11, t12, t13, t14, t16, t01; \
t01 = x2 | x3; \
t02 = x0 | x3; \
t03 = x2 ^ t02; \
t04 = x1 ^ t02; \
t05 = x0 ^ x3; \
t06 = t04 & t03; \
t07 = x1 & t01; \
y2 = t05 ^ t06; \
t09 = x0 ^ t03; \
y0 = t07 ^ t03; \
t11 = y0 | t05; \
t12 = t09 & t11; \
t13 = x0 & y2; \
t14 = t01 ^ t05; \
y1 = x1 ^ t12; \
t16 = x1 | t13; \
y3 = t14 ^ t16; \
do { \
y3 = x2 | x3; \
y0 = x1 & y3; \
y2 = x0 | x3; \
y1 = x2 ^ y2; \
y0 ^= y1; \
x3 ^= x0; \
y3 ^= x3; \
y2 ^= x1; \
y2 &= y1; \
y2 ^= x3; \
y1 ^= x0; \
x3 |= y0; \
y1 &= x3; \
y1 ^= x1; \
x0 &= y2; \
x0 |= x1; \
y3 ^= x0; \
} while (0)
/* S4 inverse: 5 0 8 3 10 9 7 14 2 12 11 6 4 15 13 1 */
/* Original single-assignment form:
t01 = x1 | x3;
t02 = x2 | x3;
t03 = x0 & t01;
t04 = x1 ^ t02;
t05 = x2 ^ x3;
t06 = ~ t03;
t07 = x0 & t04;
y1 = t05 ^ t07;
t09 = y1 | t06;
t10 = x0 ^ t07;
t11 = t01 ^ t09;
t12 = x3 ^ t04;
t13 = x2 | t10;
y3 = t03 ^ t12;
t15 = x0 ^ t04;
y2 = t11 ^ t13;
y0 = t15 ^ t09;
*/
#define SBOX4_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t05, t06, t07, t09; \
type t10, t11, t12, t13, t15, t01; \
t01 = x1 | x3; \
t02 = x2 | x3; \
t03 = x0 & t01; \
t04 = x1 ^ t02; \
t05 = x2 ^ x3; \
t06 = ~ t03; \
t07 = x0 & t04; \
y1 = t05 ^ t07; \
t09 = y1 | t06; \
t10 = x0 ^ t07; \
t11 = t01 ^ t09; \
t12 = x3 ^ t04; \
t13 = x2 | t10; \
y3 = t03 ^ t12; \
t15 = x0 ^ t04; \
y2 = t11 ^ t13; \
y0 = t15 ^ t09; \
do { \
y1 = x2 ^ x3; \
y2 = x2 | x3; \
y2 ^= x1; \
x1 |= x3; \
y0 = x0 ^ y2; \
x3 ^= y2; \
y2 &= x0; \
y1 ^= y2; \
y2 ^= x0; \
y2 |= x2; \
x0 &= x1; \
y3 = x0 ^ x3; \
x0 = ~ x0; \
x0 |= y1; \
y0 ^= x0; \
x0 ^= x1; \
y2 ^= x0; \
} while (0)
/* S5 inverse: 8 15 2 9 4 1 13 14 11 6 5 3 7 12 10 0 */
/* Original single-assignment form:
t01 = x0 & x3;
t02 = x2 ^ t01;
t03 = x0 ^ x3;
t04 = x1 & t02;
t05 = x0 & x2;
y0 = t03 ^ t04;
t07 = x0 & y0;
t08 = t01 ^ y0;
t09 = x1 | t05;
t10 = ~ x1;
y1 = t08 ^ t09;
t12 = t10 | t07;
t13 = y0 | y1;
y3 = t02 ^ t12;
t15 = t02 ^ t13;
t16 = x1 ^ x3;
y2 = t16 ^ t15;
*/
#define SBOX5_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t05, t07, t08, t09; \
......@@ -267,6 +323,28 @@
y2 = t16 ^ t15; \
} while (0)
/* S6 inverse: 15 10 1 13 5 3 6 0 4 9 14 7 2 12 8 11 */
/* Original single-assignment form:
t01 = x0 ^ x2;
t02 = ~ x2;
t03 = x1 & t01;
t04 = x1 | t02;
t05 = x3 | t03;
t06 = x1 ^ x3;
t07 = x0 & t04;
t08 = x0 | t02;
t09 = t07 ^ t05;
y1 = t06 ^ t08;
y0 = ~ t09;
t12 = x1 & y0;
t13 = t01 & t05;
t14 = t01 ^ t12;
t15 = t07 ^ t13;
t16 = x3 | t02;
t17 = x0 ^ y1;
y3 = t17 ^ t15;
y2 = t16 ^ t14;
*/
#define SBOX6_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t05, t06, t07, t08, t09; \
......@@ -292,6 +370,27 @@
y2 = t16 ^ t14; \
} while (0)
/* S7 inverse: 3 0 6 13 9 14 15 8 5 12 11 7 10 1 4 2 */
/* Original single-assignment form:
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;
*/
#define SBOX7_INVERSE(type, x0, x1, x2, x3, y0, y1, y2, y3) \
do { \
type t02, t03, t04, t06, t07, t08, t09; \
......
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