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namespace Org.BouncyCastle.Pqc.Crypto.Cmce
{
internal abstract class Benes
{
protected int SYS_N;
protected int SYS_T;
protected int GFBITS;
internal Benes(int n, int t, int m)
{
SYS_N = n;
SYS_T = t;
GFBITS = m;
}
/* input: in, a 64x64 matrix over GF(2) */
/* outputput: output, transpose of in */
internal static void Transpose64x64(ulong[] output, ulong[] input)
{
int i, j, s, d;
ulong x, y;
ulong[,] masks =
{
{0x5555555555555555L, 0xAAAAAAAAAAAAAAAAL},
{0x3333333333333333L, 0xCCCCCCCCCCCCCCCCL},
{0x0F0F0F0F0F0F0F0FL, 0xF0F0F0F0F0F0F0F0L},
{0x00FF00FF00FF00FFL, 0xFF00FF00FF00FF00L},
{0x0000FFFF0000FFFFL, 0xFFFF0000FFFF0000L},
{0x00000000FFFFFFFFL, 0xFFFFFFFF00000000L}
};
for (i = 0; i < 64; i++)
output[i] = input[i];
for (d = 5; d >= 0; d--)
{
s = 1 << d;
for (i = 0; i < 64; i += s * 2)
{
for (j = i; j < i + s; j++)
{
x = (output[j] & masks[d, 0]) | ((output[j + s] & masks[d, 0]) << s);
y = ((output[j] & masks[d, 1]) >> s) | (output[j + s] & masks[d, 1]);
output[j + 0] = x;
output[j + s] = y;
}
}
}
}
internal static void Transpose64x64(ulong[] output, ulong[] input, int offset)
{
int i, j, s, d;
ulong x, y;
ulong[,] masks =
{
{0x5555555555555555L, 0xAAAAAAAAAAAAAAAAL},
{0x3333333333333333L, 0xCCCCCCCCCCCCCCCCL},
{0x0F0F0F0F0F0F0F0FL, 0xF0F0F0F0F0F0F0F0L},
{0x00FF00FF00FF00FFL, 0xFF00FF00FF00FF00L},
{0x0000FFFF0000FFFFL, 0xFFFF0000FFFF0000L},
{0x00000000FFFFFFFFL, 0xFFFFFFFF00000000L}
};
for (i = 0; i < 64; i++)
output[i + offset] = input[i + offset];
for (d = 5; d >= 0; d--)
{
s = 1 << d;
for (i = 0; i < 64; i += s * 2)
{
for (j = i; j < i + s; j++)
{
x = (output[j + offset] & masks[d, 0]) | ((output[j + s + offset] & masks[d, 0]) << s);
y = ((output[j + offset] & masks[d, 1]) >> s) | (output[j + s + offset] & masks[d, 1]);
output[j + 0 + offset] = x;
output[j + s + offset] = y;
}
}
}
}
internal abstract void SupportGen(ushort[] s, byte[] c);
}
}
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