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namespace Org.BouncyCastle.Pqc.Crypto.Saber
{
internal class SaberUtilities
{
private readonly int SABER_N;
private readonly int SABER_L;
private readonly int SABER_ET;
private readonly int SABER_POLYBYTES;
private readonly int SABER_EP;
private readonly int SABER_KEYBYTES;
internal SaberUtilities(SaberEngine engine)
{
this.SABER_N = engine.N;
this.SABER_L = engine.L;
this.SABER_ET = engine.ET;
this.SABER_POLYBYTES = engine.PolyBytes;
this.SABER_EP = engine.EP;
this.SABER_KEYBYTES = engine.KeyBytes;
}
public void POLT2BS(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
if (SABER_ET == 3)
{
for (j = 0; j < SABER_N / 8; j++)
{
offset_byte = (short) (3 * j);
offset_data = (short) (8 * j);
bytes[byteIndex + offset_byte + 0] = (byte) ((data[offset_data + 0] & 0x7) |
((data[offset_data + 1] & 0x7) << 3) |
((data[offset_data + 2] & 0x3) << 6));
bytes[byteIndex + offset_byte + 1] = (byte) (((data[offset_data + 2] >> 2) & 0x01) |
((data[offset_data + 3] & 0x7) << 1) |
((data[offset_data + 4] & 0x7) << 4) |
(((data[offset_data + 5]) & 0x01) << 7));
bytes[byteIndex + offset_byte + 2] = (byte) (((data[offset_data + 5] >> 1) & 0x03) |
((data[offset_data + 6] & 0x7) << 2) |
((data[offset_data + 7] & 0x7) << 5));
}
}
else if (SABER_ET == 4)
{
for (j = 0; j < SABER_N / 2; j++)
{
offset_byte = j;
offset_data = (short) (2 * j);
bytes[byteIndex + offset_byte] =
(byte) ((data[offset_data] & 0x0f) | ((data[offset_data + 1] & 0x0f) << 4));
}
}
else if (SABER_ET == 6)
{
for (j = 0; j < SABER_N / 4; j++)
{
offset_byte = (short) (3 * j);
offset_data = (short) (4 * j);
bytes[byteIndex + offset_byte + 0] =
(byte) ((data[offset_data + 0] & 0x3f) | ((data[offset_data + 1] & 0x03) << 6));
bytes[byteIndex + offset_byte + 1] = (byte) (((data[offset_data + 1] >> 2) & 0x0f) |
((data[offset_data + 2] & 0x0f) << 4));
bytes[byteIndex + offset_byte + 2] = (byte) (((data[offset_data + 2] >> 4) & 0x03) |
((data[offset_data + 3] & 0x3f) << 2));
}
}
}
public void BS2POLT(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
if (SABER_ET == 3)
{
for (j = 0; j < SABER_N / 8; j++)
{
offset_byte = (short) (3 * j);
offset_data = (short) (8 * j);
data[offset_data + 0] = (short) ((bytes[byteIndex + offset_byte + 0]) & 0x07);
data[offset_data + 1] = (short) (((bytes[byteIndex + offset_byte + 0]) >> 3) & 0x07);
data[offset_data + 2] = (short) ((((bytes[byteIndex + offset_byte + 0]) >> 6) & 0x03) |
(((bytes[byteIndex + offset_byte + 1]) & 0x01) << 2));
data[offset_data + 3] = (short) (((bytes[byteIndex + offset_byte + 1]) >> 1) & 0x07);
data[offset_data + 4] = (short) (((bytes[byteIndex + offset_byte + 1]) >> 4) & 0x07);
data[offset_data + 5] = (short) ((((bytes[byteIndex + offset_byte + 1]) >> 7) & 0x01) |
(((bytes[byteIndex + offset_byte + 2]) & 0x03) << 1));
data[offset_data + 6] = (short) ((bytes[byteIndex + offset_byte + 2] >> 2) & 0x07);
data[offset_data + 7] = (short) ((bytes[byteIndex + offset_byte + 2] >> 5) & 0x07);
}
}
else if (SABER_ET == 4)
{
for (j = 0; j < SABER_N / 2; j++)
{
offset_byte = j;
offset_data = (short) (2 * j);
data[offset_data] = (short) (bytes[byteIndex + offset_byte] & 0x0f);
data[offset_data + 1] = (short) ((bytes[byteIndex + offset_byte] >> 4) & 0x0f);
}
}
else if (SABER_ET == 6)
{
for (j = 0; j < SABER_N / 4; j++)
{
offset_byte = (short) (3 * j);
offset_data = (short) (4 * j);
data[offset_data + 0] = (short) (bytes[byteIndex + offset_byte + 0] & 0x3f);
data[offset_data + 1] = (short) (((bytes[byteIndex + offset_byte + 0] >> 6) & 0x03) |
((bytes[byteIndex + offset_byte + 1] & 0x0f) << 2));
data[offset_data + 2] = (short) (((bytes[byteIndex + offset_byte + 1] & 0xff) >> 4) |
((bytes[byteIndex + offset_byte + 2] & 0x03) << 4));
data[offset_data + 3] = (short) ((bytes[byteIndex + offset_byte + 2] & 0xff) >> 2);
}
}
}
private void POLq2BS(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
for (j = 0; j < SABER_N / 8; j++)
{
offset_byte = (short) (13 * j);
offset_data = (short) (8 * j);
bytes[byteIndex + offset_byte + 0] = (byte) (data[offset_data + 0] & (0xff));
bytes[byteIndex + offset_byte + 1] =
(byte) (((data[offset_data + 0] >> 8) & 0x1f) | ((data[offset_data + 1] & 0x07) << 5));
bytes[byteIndex + offset_byte + 2] = (byte) ((data[offset_data + 1] >> 3) & 0xff);
bytes[byteIndex + offset_byte + 3] =
(byte) (((data[offset_data + 1] >> 11) & 0x03) | ((data[offset_data + 2] & 0x3f) << 2));
bytes[byteIndex + offset_byte + 4] =
(byte) (((data[offset_data + 2] >> 6) & 0x7f) | ((data[offset_data + 3] & 0x01) << 7));
bytes[byteIndex + offset_byte + 5] = (byte) ((data[offset_data + 3] >> 1) & 0xff);
bytes[byteIndex + offset_byte + 6] =
(byte) (((data[offset_data + 3] >> 9) & 0x0f) | ((data[offset_data + 4] & 0x0f) << 4));
bytes[byteIndex + offset_byte + 7] = (byte) ((data[offset_data + 4] >> 4) & 0xff);
bytes[byteIndex + offset_byte + 8] =
(byte) (((data[offset_data + 4] >> 12) & 0x01) | ((data[offset_data + 5] & 0x7f) << 1));
bytes[byteIndex + offset_byte + 9] =
(byte) (((data[offset_data + 5] >> 7) & 0x3f) | ((data[offset_data + 6] & 0x03) << 6));
bytes[byteIndex + offset_byte + 10] = (byte) ((data[offset_data + 6] >> 2) & 0xff);
bytes[byteIndex + offset_byte + 11] =
(byte) (((data[offset_data + 6] >> 10) & 0x07) | ((data[offset_data + 7] & 0x1f) << 3));
bytes[byteIndex + offset_byte + 12] = (byte) ((data[offset_data + 7] >> 5) & 0xff);
}
}
private void BS2POLq(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
for (j = 0; j < SABER_N / 8; j++)
{
offset_byte = (short) (13 * j);
offset_data = (short) (8 * j);
data[offset_data + 0] = (short) ((bytes[byteIndex + offset_byte + 0] & (0xff)) |
((bytes[byteIndex + offset_byte + 1] & 0x1f) << 8));
data[offset_data + 1] = (short) ((bytes[byteIndex + offset_byte + 1] >> 5 & (0x07)) |
((bytes[byteIndex + offset_byte + 2] & 0xff) << 3) |
((bytes[byteIndex + offset_byte + 3] & 0x03) << 11));
data[offset_data + 2] = (short) ((bytes[byteIndex + offset_byte + 3] >> 2 & (0x3f)) |
((bytes[byteIndex + offset_byte + 4] & 0x7f) << 6));
data[offset_data + 3] = (short) ((bytes[byteIndex + offset_byte + 4] >> 7 & (0x01)) |
((bytes[byteIndex + offset_byte + 5] & 0xff) << 1) |
((bytes[byteIndex + offset_byte + 6] & 0x0f) << 9));
data[offset_data + 4] = (short) ((bytes[byteIndex + offset_byte + 6] >> 4 & (0x0f)) |
((bytes[byteIndex + offset_byte + 7] & 0xff) << 4) |
((bytes[byteIndex + offset_byte + 8] & 0x01) << 12));
data[offset_data + 5] = (short) ((bytes[byteIndex + offset_byte + 8] >> 1 & (0x7f)) |
((bytes[byteIndex + offset_byte + 9] & 0x3f) << 7));
data[offset_data + 6] = (short) ((bytes[byteIndex + offset_byte + 9] >> 6 & (0x03)) |
((bytes[byteIndex + offset_byte + 10] & 0xff) << 2) |
((bytes[byteIndex + offset_byte + 11] & 0x07) << 10));
data[offset_data + 7] = (short) ((bytes[byteIndex + offset_byte + 11] >> 3 & (0x1f)) |
((bytes[byteIndex + offset_byte + 12] & 0xff) << 5));
}
}
private void POLp2BS(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
for (j = 0; j < SABER_N / 4; j++)
{
offset_byte = (short) (5 * j);
offset_data = (short) (4 * j);
bytes[byteIndex + offset_byte + 0] = (byte) (data[offset_data + 0] & (0xff));
bytes[byteIndex + offset_byte + 1] =
(byte) (((data[offset_data + 0] >> 8) & 0x03) | ((data[offset_data + 1] & 0x3f) << 2));
bytes[byteIndex + offset_byte + 2] =
(byte) (((data[offset_data + 1] >> 6) & 0x0f) | ((data[offset_data + 2] & 0x0f) << 4));
bytes[byteIndex + offset_byte + 3] =
(byte) (((data[offset_data + 2] >> 4) & 0x3f) | ((data[offset_data + 3] & 0x03) << 6));
bytes[byteIndex + offset_byte + 4] = (byte) ((data[offset_data + 3] >> 2) & 0xff);
}
}
public void BS2POLp(byte[] bytes, int byteIndex, short[] data)
{
short j, offset_byte, offset_data;
for (j = 0; j < SABER_N / 4; j++)
{
offset_byte = (short) (5 * j);
offset_data = (short) (4 * j);
data[offset_data + 0] = (short) ((bytes[byteIndex + offset_byte + 0] & (0xff)) |
((bytes[byteIndex + offset_byte + 1] & 0x03) << 8));
data[offset_data + 1] = (short) (((bytes[byteIndex + offset_byte + 1] >> 2) & (0x3f)) |
((bytes[byteIndex + offset_byte + 2] & 0x0f) << 6));
data[offset_data + 2] = (short) (((bytes[byteIndex + offset_byte + 2] >> 4) & (0x0f)) |
((bytes[byteIndex + offset_byte + 3] & 0x3f) << 4));
data[offset_data + 3] = (short) (((bytes[byteIndex + offset_byte + 3] >> 6) & (0x03)) |
((bytes[byteIndex + offset_byte + 4] & 0xff) << 2));
}
}
public void POLVECq2BS(byte[] bytes, short[][] data)
{
byte i;
for (i = 0; i < SABER_L; i++)
{
POLq2BS(bytes, i * SABER_POLYBYTES, data[i]);
}
}
public void BS2POLVECq(byte[] bytes, int byteIndex, short[][] data)
{
byte i;
for (i = 0; i < SABER_L; i++)
{
BS2POLq(bytes, byteIndex + i * SABER_POLYBYTES, data[i]);
}
}
public void POLVECp2BS(byte[] bytes, short[][] data)
{
byte i;
for (i = 0; i < SABER_L; i++)
{
POLp2BS(bytes, i * (SABER_EP * SABER_N / 8), data[i]);
}
}
public void BS2POLVECp(byte[] bytes, short[][] data)
{
byte i;
for (i = 0; i < SABER_L; i++)
{
BS2POLp(bytes, i * (SABER_EP * SABER_N / 8), data[i]);
}
}
public void BS2POLmsg(byte[] bytes, short[] data)
{
byte i, j;
for (j = 0; j < SABER_KEYBYTES; j++)
{
for (i = 0; i < 8; i++)
{
data[j * 8 + i] = (short) ((bytes[j] >> i) & 0x01);
}
}
}
public void POLmsg2BS(byte[] bytes, short[] data)
{
byte i, j;
for (j = 0; j < SABER_KEYBYTES; j++)
{
for (i = 0; i < 8; i++)
{
bytes[j] = (byte) (bytes[j] | ((data[j * 8 + i] & 0x01) << i));
}
}
}
}
}
|
