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namespace Org.BouncyCastle.Pqc.Crypto.Cmce
{
internal class Benes12
: Benes
{
internal Benes12(int n, int t, int m)
: base(n, t, m)
{
}
/* one layer of the benes network */
internal static void LayerBenes(ulong[] data, ulong[] bits, int lgs)
{
int i, j, s;
int bit_ptr = 0;
ulong d;
s = 1 << lgs;
for (i = 0; i < 64; i += s * 2)
{
for (j = i; j < i + s; j++)
{
d = (data[j + 0] ^ data[j + s]);
d &= bits[bit_ptr++];
data[j + 0] ^= d;
data[j + s] ^= d;
}
}
}
private void ApplyBenes(byte[] r, byte[] bits, int rev)
{
int i;
int cond_ptr;
int inc, low;
ulong[] bs = new ulong[64];
ulong[] cond = new ulong[64];
Utils.Load8(r, 0, bs, 0, 64);
if (rev == 0)
{
inc = 256;
cond_ptr = SYS_T * 2 + 40;
}
else
{
inc = -256;
cond_ptr = SYS_T * 2 + 40 + (2 * GFBITS - 2) * 256;
}
Transpose64x64(bs, bs);
for (low = 0; low <= 5; low++)
{
for (i = 0; i < 64; i++)
{
cond[i] = Utils.Load4(bits, cond_ptr + i * 4);
}
Transpose64x64(cond, cond);
LayerBenes(bs, cond, low);
cond_ptr += inc;
}
Transpose64x64(bs, bs);
for (low = 0; low <= 5; low++)
{
Utils.Load8(bits, cond_ptr, cond, 0, 32);
LayerBenes(bs, cond, low);
cond_ptr += inc;
}
for (low = 4; low >= 0; low--)
{
Utils.Load8(bits, cond_ptr, cond, 0, 32);
LayerBenes(bs, cond, low);
cond_ptr += inc;
}
Transpose64x64(bs, bs);
for (low = 5; low >= 0; low--)
{
for (i = 0; i < 64; i++)
{
cond[i] = Utils.Load4(bits, cond_ptr + i * 4);
}
Transpose64x64(cond, cond);
LayerBenes(bs, cond, low);
cond_ptr += inc;
}
Transpose64x64(bs, bs);
Utils.Store8(r, 0, bs, 0, 64);
}
// from benes network
internal override void SupportGen(ushort[] s, byte[] c)
{
ushort a;
byte[][] L = new byte[GFBITS][]; //(1 << GFBITS)/8
for (int i = 0; i < GFBITS; i++)
{
for (int j = 0; j < (1 << GFBITS) / 8; j++)
{
L[i] = new byte[(1 << GFBITS) / 8];
}
}
for (ushort i = 0; i < (1 << GFBITS); i++)
{
a = Utils.Bitrev(i, GFBITS);
for (int j = 0; j < GFBITS; j++)
{
L[j][i / 8] |= (byte) (((a >> j) & 1) << (i%8));
}
}
for (int j = 0; j < GFBITS; j++)
{
ApplyBenes(L[j], c, 0);
}
for (int i = 0; i < SYS_N; i++)
{
s[i] = 0;
for (int j = GFBITS - 1; j >= 0; j--)
{
s[i] <<= 1;
s[i] |= (ushort) ((L[j][i / 8] >> (i % 8)) & 1);
}
}
}
}
}
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