private static int fourBytesToInt(byte b[], int offset)
{
int value; value = byteToUnsigned(b[offset++]);
value |= (byteToUnsigned(b[offset++]) << 8);
value |= (byteToUnsigned(b[offset++]) << 16);
value |= (byteToUnsigned(b[offset++]) << 24); return(value);
} private static final void intToFourBytes(int iValue, byte b[], int offset)
{
b[offset++] = (byte)((iValue) & 0xff);
b[offset++] = (byte)((iValue >>> 8 ) & 0xff);
b[offset++] = (byte)((iValue >>> 16) & 0xff);
b[offset++] = (byte)((iValue >>> 24) & 0xff);
} private static final void PERM_OP(int a, int b, int n, int m, int results[])
{
int t; t = ((a >>> n) ^ b) & m;
a ^= t << n;
b ^= t; results[0] = a;
results[1] = b;
}
{
int value; value = byteToUnsigned(b[offset++]);
value |= (byteToUnsigned(b[offset++]) << 8);
value |= (byteToUnsigned(b[offset++]) << 16);
value |= (byteToUnsigned(b[offset++]) << 24); return(value);
} private static final void intToFourBytes(int iValue, byte b[], int offset)
{
b[offset++] = (byte)((iValue) & 0xff);
b[offset++] = (byte)((iValue >>> 8 ) & 0xff);
b[offset++] = (byte)((iValue >>> 16) & 0xff);
b[offset++] = (byte)((iValue >>> 24) & 0xff);
} private static final void PERM_OP(int a, int b, int n, int m, int results[])
{
int t; t = ((a >>> n) ^ b) & m;
a ^= t << n;
b ^= t; results[0] = a;
results[1] = b;
}
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{
int t; t = ((a << (16 - n)) ^ a) & m;
a = a ^ t ^ (t >>> (16 - n)); return(a);
} private static int [] des_set_key(byte key[])
{
int schedule[] = new int[ITERATIONS * 2]; int c = fourBytesToInt(key, 0);
int d = fourBytesToInt(key, 4); int results[] = new int[2]; PERM_OP(d, c, 4, 0x0f0f0f0f, results);
d = results[0]; c = results[1]; c = HPERM_OP(c, -2, 0xcccc0000);
d = HPERM_OP(d, -2, 0xcccc0000); PERM_OP(d, c, 1, 0x55555555, results);
d = results[0]; c = results[1]; PERM_OP(c, d, 8, 0x00ff00ff, results);
c = results[0]; d = results[1]; PERM_OP(d, c, 1, 0x55555555, results);
d = results[0]; c = results[1]; d = (((d & 0x000000ff) << 16) | (d & 0x0000ff00) |
((d & 0x00ff0000) >>> 16) | ((c & 0xf0000000) >>> 4));
c &= 0x0fffffff; int s, t;
int j = 0; for(int i = 0; i < ITERATIONS; i ++)
{
if(shifts2[i])
{
c = (c >>> 2) | (c << 26);
d = (d >>> 2) | (d << 26);
}
else
{
c = (c >>> 1) | (c << 27);
d = (d >>> 1) | (d << 27);
} c &= 0x0fffffff;
d &= 0x0fffffff; s = skb[0][ (c ) & 0x3f ]|
skb[1][((c >>> 6) & 0x03) | ((c >>> 7) & 0x3c)]|
skb[2][((c >>> 13) & 0x0f) | ((c >>> 14) & 0x30)]|
skb[3][((c >>> 20) & 0x01) | ((c >>> 21) & 0x06) |
((c >>> 22) & 0x38)]; t = skb[4][ (d ) & 0x3f ]|
skb[5][((d >>> 7) & 0x03) | ((d >>> 8) & 0x3c)]|
skb[6][ (d >>>15) & 0x3f ]|
skb[7][((d >>>21) & 0x0f) | ((d >>> 22) & 0x30)]; schedule[j++] = ((t << 16) | (s & 0x0000ffff)) & 0xffffffff;
s = ((s >>> 16) | (t & 0xffff0000)); s = (s << 4) | (s >>> 28);
schedule[j++] = s & 0xffffffff;
}
return(schedule);
} private static final int D_ENCRYPT
(
int L, int R, int S, int E0, int E1, int s[]
)
{
int t, u, v; v = R ^ (R >>> 16);
u = v & E0;
v = v & E1;
u = (u ^ (u << 16)) ^ R ^ s[S];
t = (v ^ (v << 16)) ^ R ^ s[S + 1];
t = (t >>> 4) | (t << 28); L ^= SPtrans[1][(t ) & 0x3f] |
SPtrans[3][(t >>> 8) & 0x3f] |
SPtrans[5][(t >>> 16) & 0x3f] |
SPtrans[7][(t >>> 24) & 0x3f] |
SPtrans[0][(u ) & 0x3f] |
SPtrans[2][(u >>> 8) & 0x3f] |
SPtrans[4][(u >>> 16) & 0x3f] |
SPtrans[6][(u >>> 24) & 0x3f]; return(L);
}
{
int left = 0;
int right = 0;
int t = 0; for(int j = 0; j < 25; j ++)
{
for(int i = 0; i < ITERATIONS * 2; i += 4)
{
left = D_ENCRYPT(left, right, i, Eswap0, Eswap1, schedule);
right = D_ENCRYPT(right, left, i + 2, Eswap0, Eswap1, schedule);
}
t = left;
left = right;
right = t;
} t = right; right = (left >>> 1) | (left << 31);
left = (t >>> 1) | (t << 31); left &= 0xffffffff;
right &= 0xffffffff; int results[] = new int[2]; PERM_OP(right, left, 1, 0x55555555, results);
right = results[0]; left = results[1]; PERM_OP(left, right, 8, 0x00ff00ff, results);
left = results[0]; right = results[1]; PERM_OP(right, left, 2, 0x33333333, results);
right = results[0]; left = results[1]; PERM_OP(left, right, 16, 0x0000ffff, results);
left = results[0]; right = results[1]; PERM_OP(right, left, 4, 0x0f0f0f0f, results);
right = results[0]; left = results[1]; int out[] = new int[2]; out[0] = left; out[1] = right; return(out);
}