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hashcat/OpenCL/kernel_serpent256_amd.c

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/* This is an independent implementation of the encryption algorithm: */
/* */
/* Serpent by Ross Anderson, Eli Biham and Lars Knudsen */
/* */
/* which is a candidate algorithm in the Advanced Encryption Standard */
/* programme of the US National Institute of Standards and Technology. */
/* */
/* Copyright in this implementation is held by Dr B R Gladman but I */
/* hereby give permission for its free direct or derivative use subject */
/* to acknowledgment of its origin and compliance with any conditions */
/* that the originators of the algorithm place on its exploitation. */
/* */
/* Dr Brian Gladman (gladman@seven77.demon.co.uk) 14th January 1999 */
/* */
/* -------------------------------------------------------------------- */
/* */
/* Cleaned and optimized for GPU use with oclHashcat by Jens Steube */
/* 15 terms */
#define sb0(a,b,c,d,e,f,g,h) \
t1 = a ^ d; \
t2 = a & d; \
t3 = c ^ t1; \
t6 = b & t1; \
t4 = b ^ t3; \
t10 = ~t3; \
h = t2 ^ t4; \
t7 = a ^ t6; \
t14 = ~t7; \
t8 = c | t7; \
t11 = t3 ^ t7; \
g = t4 ^ t8; \
t12 = h & t11; \
f = t10 ^ t12; \
e = t12 ^ t14
/* 15 terms */
#define ib0(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = a ^ b; \
t3 = t1 | t2; \
t4 = d ^ t3; \
t7 = d & t2; \
t5 = c ^ t4; \
t8 = t1 ^ t7; \
g = t2 ^ t5; \
t11 = a & t4; \
t9 = g & t8; \
t14 = t5 ^ t8; \
f = t4 ^ t9; \
t12 = t5 | f; \
h = t11 ^ t12; \
e = h ^ t14
/* 14 terms! */
#define sb1(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = b ^ t1; \
t3 = a | t2; \
t4 = d | t2; \
t5 = c ^ t3; \
g = d ^ t5; \
t7 = b ^ t4; \
t8 = t2 ^ g; \
t9 = t5 & t7; \
h = t8 ^ t9; \
t11 = t5 ^ t7; \
f = h ^ t11; \
t13 = t8 & t11; \
e = t5 ^ t13
/* 17 terms */
#define ib1(a,b,c,d,e,f,g,h) \
t1 = a ^ d; \
t2 = a & b; \
t3 = b ^ c; \
t4 = a ^ t3; \
t5 = b | d; \
t7 = c | t1; \
h = t4 ^ t5; \
t8 = b ^ t7; \
t11 = ~t2; \
t9 = t4 & t8; \
f = t1 ^ t9; \
t13 = t9 ^ t11; \
t12 = h & f; \
g = t12 ^ t13; \
t15 = a & d; \
t16 = c ^ t13; \
e = t15 ^ t16
/* 16 terms */
#define sb2(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = b ^ d; \
t3 = c & t1; \
t13 = d | t1; \
e = t2 ^ t3; \
t5 = c ^ t1; \
t6 = c ^ e; \
t7 = b & t6; \
t10 = e | t5; \
h = t5 ^ t7; \
t9 = d | t7; \
t11 = t9 & t10; \
t14 = t2 ^ h; \
g = a ^ t11; \
t15 = g ^ t13; \
f = t14 ^ t15
/* 16 terms */
#define ib2(a,b,c,d,e,f,g,h) \
t1 = b ^ d; \
t2 = ~t1; \
t3 = a ^ c; \
t4 = c ^ t1; \
t7 = a | t2; \
t5 = b & t4; \
t8 = d ^ t7; \
t11 = ~t4; \
e = t3 ^ t5; \
t9 = t3 | t8; \
t14 = d & t11; \
h = t1 ^ t9; \
t12 = e | h; \
f = t11 ^ t12; \
t15 = t3 ^ t12; \
g = t14 ^ t15
/* 17 terms */
#define sb3(a,b,c,d,e,f,g,h) \
t1 = a ^ c; \
t2 = d ^ t1; \
t3 = a & t2; \
t4 = d ^ t3; \
t5 = b & t4; \
g = t2 ^ t5; \
t7 = a | g; \
t8 = b | d; \
t11 = a | d; \
t9 = t4 & t7; \
f = t8 ^ t9; \
t12 = b ^ t11; \
t13 = g ^ t9; \
t15 = t3 ^ t8; \
h = t12 ^ t13; \
t16 = c & t15; \
e = t12 ^ t16
/* 16 term solution that performs less well than 17 term one
in my environment (PPro/PII)
#define sb3(a,b,c,d,e,f,g,h) \
t1 = a ^ b; \
t2 = a & c; \
t3 = a | d; \
t4 = c ^ d; \
t5 = t1 & t3; \
t6 = t2 | t5; \
g = t4 ^ t6; \
t8 = b ^ t3; \
t9 = t6 ^ t8; \
t10 = t4 & t9; \
e = t1 ^ t10; \
t12 = g & e; \
f = t9 ^ t12; \
t14 = b | d; \
t15 = t4 ^ t12; \
h = t14 ^ t15
*/
/* 17 terms */
#define ib3(a,b,c,d,e,f,g,h) \
t1 = b ^ c; \
t2 = b | c; \
t3 = a ^ c; \
t7 = a ^ d; \
t4 = t2 ^ t3; \
t5 = d | t4; \
t9 = t2 ^ t7; \
e = t1 ^ t5; \
t8 = t1 | t5; \
t11 = a & t4; \
g = t8 ^ t9; \
t12 = e | t9; \
f = t11 ^ t12; \
t14 = a & g; \
t15 = t2 ^ t14; \
t16 = e & t15; \
h = t4 ^ t16
/* 15 terms */
#define sb4(a,b,c,d,e,f,g,h) \
t1 = a ^ d; \
t2 = d & t1; \
t3 = c ^ t2; \
t4 = b | t3; \
h = t1 ^ t4; \
t6 = ~b; \
t7 = t1 | t6; \
e = t3 ^ t7; \
t9 = a & e; \
t10 = t1 ^ t6; \
t11 = t4 & t10; \
g = t9 ^ t11; \
t13 = a ^ t3; \
t14 = t10 & g; \
f = t13 ^ t14
/* 17 terms */
#define ib4(a,b,c,d,e,f,g,h) \
t1 = c ^ d; \
t2 = c | d; \
t3 = b ^ t2; \
t4 = a & t3; \
f = t1 ^ t4; \
t6 = a ^ d; \
t7 = b | d; \
t8 = t6 & t7; \
h = t3 ^ t8; \
t10 = ~a; \
t11 = c ^ h; \
t12 = t10 | t11;\
e = t3 ^ t12; \
t14 = c | t4; \
t15 = t7 ^ t14; \
t16 = h | t10; \
g = t15 ^ t16
/* 16 terms */
#define sb5(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = a ^ b; \
t3 = a ^ d; \
t4 = c ^ t1; \
t5 = t2 | t3; \
e = t4 ^ t5; \
t7 = d & e; \
t8 = t2 ^ e; \
t10 = t1 | e; \
f = t7 ^ t8; \
t11 = t2 | t7; \
t12 = t3 ^ t10; \
t14 = b ^ t7; \
g = t11 ^ t12; \
t15 = f & t12; \
h = t14 ^ t15
/* 16 terms */
#define ib5(a,b,c,d,e,f,g,h) \
t1 = ~c; \
t2 = b & t1; \
t3 = d ^ t2; \
t4 = a & t3; \
t5 = b ^ t1; \
h = t4 ^ t5; \
t7 = b | h; \
t8 = a & t7; \
f = t3 ^ t8; \
t10 = a | d; \
t11 = t1 ^ t7; \
e = t10 ^ t11; \
t13 = a ^ c; \
t14 = b & t10; \
t15 = t4 | t13; \
g = t14 ^ t15
/* 15 terms */
#define sb6(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = a ^ d; \
t3 = b ^ t2; \
t4 = t1 | t2; \
t5 = c ^ t4; \
f = b ^ t5; \
t13 = ~t5; \
t7 = t2 | f; \
t8 = d ^ t7; \
t9 = t5 & t8; \
g = t3 ^ t9; \
t11 = t5 ^ t8; \
e = g ^ t11; \
t14 = t3 & t11; \
h = t13 ^ t14
/* 15 terms */
#define ib6(a,b,c,d,e,f,g,h) \
t1 = ~a; \
t2 = a ^ b; \
t3 = c ^ t2; \
t4 = c | t1; \
t5 = d ^ t4; \
t13 = d & t1; \
f = t3 ^ t5; \
t7 = t3 & t5; \
t8 = t2 ^ t7; \
t9 = b | t8; \
h = t5 ^ t9; \
t11 = b | h; \
e = t8 ^ t11; \
t14 = t3 ^ t11; \
g = t13 ^ t14
/* 17 terms */
#define sb7(a,b,c,d,e,f,g,h) \
t1 = ~c; \
t2 = b ^ c; \
t3 = b | t1; \
t4 = d ^ t3; \
t5 = a & t4; \
t7 = a ^ d; \
h = t2 ^ t5; \
t8 = b ^ t5; \
t9 = t2 | t8; \
t11 = d & t3; \
f = t7 ^ t9; \
t12 = t5 ^ f; \
t15 = t1 | t4; \
t13 = h & t12; \
g = t11 ^ t13; \
t16 = t12 ^ g; \
e = t15 ^ t16
/* 17 terms */
#define ib7(a,b,c,d,e,f,g,h) \
t1 = a & b; \
t2 = a | b; \
t3 = c | t1; \
t4 = d & t2; \
h = t3 ^ t4; \
t6 = ~d; \
t7 = b ^ t4; \
t8 = h ^ t6; \
t11 = c ^ t7; \
t9 = t7 | t8; \
f = a ^ t9; \
t12 = d | f; \
e = t11 ^ t12; \
t14 = a & h; \
t15 = t3 ^ f; \
t16 = e ^ t14; \
g = t15 ^ t16
#define k_xor(r,a,b,c,d) \
a ^= ks[4 * r + 8]; \
b ^= ks[4 * r + 9]; \
c ^= ks[4 * r + 10]; \
d ^= ks[4 * r + 11]
#define k_set(r,a,b,c,d) \
a = ks[4 * r + 8]; \
b = ks[4 * r + 9]; \
c = ks[4 * r + 10]; \
d = ks[4 * r + 11]
#define k_get(r,a,b,c,d) \
ks[4 * r + 8] = a; \
ks[4 * r + 9] = b; \
ks[4 * r + 10] = c; \
ks[4 * r + 11] = d
/* the linear transformation and its inverse */
#define rot(a,b,c,d) \
a = rotl32(a, 13); \
c = rotl32(c, 3); \
d ^= c ^ (a << 3); \
b ^= a ^ c; \
d = rotl32(d, 7); \
b = rotl32(b, 1); \
a ^= b ^ d; \
c ^= d ^ (b << 7); \
a = rotl32(a, 5); \
c = rotl32(c, 22)
#define irot(a,b,c,d) \
c = rotr32(c, 22); \
a = rotr32(a, 5); \
c ^= d ^ (b << 7); \
a ^= b ^ d; \
d = rotr32(d, 7); \
b = rotr32(b, 1); \
d ^= c ^ (a << 3); \
b ^= a ^ c; \
c = rotr32(c, 3); \
a = rotr32(a, 13)
static void serpent256_set_key (u32 *ks, const u32 *ukey)
{
#pragma unroll
for (int i = 0; i < 8; i++)
{
ks[i] = ukey[i];
}
#pragma unroll
for (int i = 0; i < 132; i++)
{
ks[i + 8] = rotl32 (ks[i + 7] ^ ks[i + 5] ^ ks[i + 3] ^ ks[i + 0] ^ 0x9e3779b9 ^ i, 11);
}
u32 a,b,c,d,e,f,g,h;
u32 t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14,t15,t16;
k_set( 0,a,b,c,d); sb3(a,b,c,d,e,f,g,h); k_get( 0,e,f,g,h);
k_set( 1,a,b,c,d); sb2(a,b,c,d,e,f,g,h); k_get( 1,e,f,g,h);
k_set( 2,a,b,c,d); sb1(a,b,c,d,e,f,g,h); k_get( 2,e,f,g,h);
k_set( 3,a,b,c,d); sb0(a,b,c,d,e,f,g,h); k_get( 3,e,f,g,h);
k_set( 4,a,b,c,d); sb7(a,b,c,d,e,f,g,h); k_get( 4,e,f,g,h);
k_set( 5,a,b,c,d); sb6(a,b,c,d,e,f,g,h); k_get( 5,e,f,g,h);
k_set( 6,a,b,c,d); sb5(a,b,c,d,e,f,g,h); k_get( 6,e,f,g,h);
k_set( 7,a,b,c,d); sb4(a,b,c,d,e,f,g,h); k_get( 7,e,f,g,h);
k_set( 8,a,b,c,d); sb3(a,b,c,d,e,f,g,h); k_get( 8,e,f,g,h);
k_set( 9,a,b,c,d); sb2(a,b,c,d,e,f,g,h); k_get( 9,e,f,g,h);
k_set(10,a,b,c,d); sb1(a,b,c,d,e,f,g,h); k_get(10,e,f,g,h);
k_set(11,a,b,c,d); sb0(a,b,c,d,e,f,g,h); k_get(11,e,f,g,h);
k_set(12,a,b,c,d); sb7(a,b,c,d,e,f,g,h); k_get(12,e,f,g,h);
k_set(13,a,b,c,d); sb6(a,b,c,d,e,f,g,h); k_get(13,e,f,g,h);
k_set(14,a,b,c,d); sb5(a,b,c,d,e,f,g,h); k_get(14,e,f,g,h);
k_set(15,a,b,c,d); sb4(a,b,c,d,e,f,g,h); k_get(15,e,f,g,h);
k_set(16,a,b,c,d); sb3(a,b,c,d,e,f,g,h); k_get(16,e,f,g,h);
k_set(17,a,b,c,d); sb2(a,b,c,d,e,f,g,h); k_get(17,e,f,g,h);
k_set(18,a,b,c,d); sb1(a,b,c,d,e,f,g,h); k_get(18,e,f,g,h);
k_set(19,a,b,c,d); sb0(a,b,c,d,e,f,g,h); k_get(19,e,f,g,h);
k_set(20,a,b,c,d); sb7(a,b,c,d,e,f,g,h); k_get(20,e,f,g,h);
k_set(21,a,b,c,d); sb6(a,b,c,d,e,f,g,h); k_get(21,e,f,g,h);
k_set(22,a,b,c,d); sb5(a,b,c,d,e,f,g,h); k_get(22,e,f,g,h);
k_set(23,a,b,c,d); sb4(a,b,c,d,e,f,g,h); k_get(23,e,f,g,h);
k_set(24,a,b,c,d); sb3(a,b,c,d,e,f,g,h); k_get(24,e,f,g,h);
k_set(25,a,b,c,d); sb2(a,b,c,d,e,f,g,h); k_get(25,e,f,g,h);
k_set(26,a,b,c,d); sb1(a,b,c,d,e,f,g,h); k_get(26,e,f,g,h);
k_set(27,a,b,c,d); sb0(a,b,c,d,e,f,g,h); k_get(27,e,f,g,h);
k_set(28,a,b,c,d); sb7(a,b,c,d,e,f,g,h); k_get(28,e,f,g,h);
k_set(29,a,b,c,d); sb6(a,b,c,d,e,f,g,h); k_get(29,e,f,g,h);
k_set(30,a,b,c,d); sb5(a,b,c,d,e,f,g,h); k_get(30,e,f,g,h);
k_set(31,a,b,c,d); sb4(a,b,c,d,e,f,g,h); k_get(31,e,f,g,h);
k_set(32,a,b,c,d); sb3(a,b,c,d,e,f,g,h); k_get(32,e,f,g,h);
}
static void serpent256_encrypt (const u32 *ks, const u32 *in, u32 *out)
{
u32 a,b,c,d,e,f,g,h;
u32 t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14,t15,t16;
a = in[0];
b = in[1];
c = in[2];
d = in[3];
k_xor( 0,a,b,c,d); sb0(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor( 1,e,f,g,h); sb1(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor( 2,a,b,c,d); sb2(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor( 3,e,f,g,h); sb3(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor( 4,a,b,c,d); sb4(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor( 5,e,f,g,h); sb5(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor( 6,a,b,c,d); sb6(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor( 7,e,f,g,h); sb7(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor( 8,a,b,c,d); sb0(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor( 9,e,f,g,h); sb1(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(10,a,b,c,d); sb2(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(11,e,f,g,h); sb3(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(12,a,b,c,d); sb4(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(13,e,f,g,h); sb5(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(14,a,b,c,d); sb6(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(15,e,f,g,h); sb7(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(16,a,b,c,d); sb0(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(17,e,f,g,h); sb1(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(18,a,b,c,d); sb2(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(19,e,f,g,h); sb3(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(20,a,b,c,d); sb4(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(21,e,f,g,h); sb5(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(22,a,b,c,d); sb6(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(23,e,f,g,h); sb7(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(24,a,b,c,d); sb0(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(25,e,f,g,h); sb1(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(26,a,b,c,d); sb2(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(27,e,f,g,h); sb3(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(28,a,b,c,d); sb4(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(29,e,f,g,h); sb5(e,f,g,h,a,b,c,d); rot(a,b,c,d);
k_xor(30,a,b,c,d); sb6(a,b,c,d,e,f,g,h); rot(e,f,g,h);
k_xor(31,e,f,g,h); sb7(e,f,g,h,a,b,c,d);
k_xor(32,a,b,c,d);
out[0] = a;
out[1] = b;
out[2] = c;
out[3] = d;
}
static void serpent256_decrypt (const u32 *ks, const u32 *in, u32 *out)
{
u32 a,b,c,d,e,f,g,h;
u32 t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14,t15,t16;
a = in[0];
b = in[1];
c = in[2];
d = in[3];
k_xor(32,a,b,c,d);
ib7(a,b,c,d,e,f,g,h); k_xor(31,e,f,g,h);
irot(e,f,g,h); ib6(e,f,g,h,a,b,c,d); k_xor(30,a,b,c,d);
irot(a,b,c,d); ib5(a,b,c,d,e,f,g,h); k_xor(29,e,f,g,h);
irot(e,f,g,h); ib4(e,f,g,h,a,b,c,d); k_xor(28,a,b,c,d);
irot(a,b,c,d); ib3(a,b,c,d,e,f,g,h); k_xor(27,e,f,g,h);
irot(e,f,g,h); ib2(e,f,g,h,a,b,c,d); k_xor(26,a,b,c,d);
irot(a,b,c,d); ib1(a,b,c,d,e,f,g,h); k_xor(25,e,f,g,h);
irot(e,f,g,h); ib0(e,f,g,h,a,b,c,d); k_xor(24,a,b,c,d);
irot(a,b,c,d); ib7(a,b,c,d,e,f,g,h); k_xor(23,e,f,g,h);
irot(e,f,g,h); ib6(e,f,g,h,a,b,c,d); k_xor(22,a,b,c,d);
irot(a,b,c,d); ib5(a,b,c,d,e,f,g,h); k_xor(21,e,f,g,h);
irot(e,f,g,h); ib4(e,f,g,h,a,b,c,d); k_xor(20,a,b,c,d);
irot(a,b,c,d); ib3(a,b,c,d,e,f,g,h); k_xor(19,e,f,g,h);
irot(e,f,g,h); ib2(e,f,g,h,a,b,c,d); k_xor(18,a,b,c,d);
irot(a,b,c,d); ib1(a,b,c,d,e,f,g,h); k_xor(17,e,f,g,h);
irot(e,f,g,h); ib0(e,f,g,h,a,b,c,d); k_xor(16,a,b,c,d);
irot(a,b,c,d); ib7(a,b,c,d,e,f,g,h); k_xor(15,e,f,g,h);
irot(e,f,g,h); ib6(e,f,g,h,a,b,c,d); k_xor(14,a,b,c,d);
irot(a,b,c,d); ib5(a,b,c,d,e,f,g,h); k_xor(13,e,f,g,h);
irot(e,f,g,h); ib4(e,f,g,h,a,b,c,d); k_xor(12,a,b,c,d);
irot(a,b,c,d); ib3(a,b,c,d,e,f,g,h); k_xor(11,e,f,g,h);
irot(e,f,g,h); ib2(e,f,g,h,a,b,c,d); k_xor(10,a,b,c,d);
irot(a,b,c,d); ib1(a,b,c,d,e,f,g,h); k_xor( 9,e,f,g,h);
irot(e,f,g,h); ib0(e,f,g,h,a,b,c,d); k_xor( 8,a,b,c,d);
irot(a,b,c,d); ib7(a,b,c,d,e,f,g,h); k_xor( 7,e,f,g,h);
irot(e,f,g,h); ib6(e,f,g,h,a,b,c,d); k_xor( 6,a,b,c,d);
irot(a,b,c,d); ib5(a,b,c,d,e,f,g,h); k_xor( 5,e,f,g,h);
irot(e,f,g,h); ib4(e,f,g,h,a,b,c,d); k_xor( 4,a,b,c,d);
irot(a,b,c,d); ib3(a,b,c,d,e,f,g,h); k_xor( 3,e,f,g,h);
irot(e,f,g,h); ib2(e,f,g,h,a,b,c,d); k_xor( 2,a,b,c,d);
irot(a,b,c,d); ib1(a,b,c,d,e,f,g,h); k_xor( 1,e,f,g,h);
irot(e,f,g,h); ib0(e,f,g,h,a,b,c,d); k_xor( 0,a,b,c,d);
out[0] = a;
out[1] = b;
out[2] = c;
out[3] = d;
}
static void serpent256_decrypt_xts (const u32 *ukey1, const u32 *ukey2, const u32 *in, u32 *out)
{
u32 T[4] = { 0 };
u32 Z[4] = { 0 };
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
out[3] = in[3];
u32 ks[140];
serpent256_set_key (ks, ukey2);
serpent256_encrypt (ks, Z, T);
out[0] ^= T[0];
out[1] ^= T[1];
out[2] ^= T[2];
out[3] ^= T[3];
serpent256_set_key (ks, ukey1);
serpent256_decrypt (ks, out, out);
out[0] ^= T[0];
out[1] ^= T[1];
out[2] ^= T[2];
out[3] ^= T[3];
}
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