org.bouncycastle.math.raw.Nat576 Maven / Gradle / Ivy
package org.bouncycastle.math.raw;
import java.math.BigInteger;
import org.bouncycastle.util.Pack;
public abstract class Nat576
{
public static void copy64(long[] x, long[] z)
{
z[0] = x[0];
z[1] = x[1];
z[2] = x[2];
z[3] = x[3];
z[4] = x[4];
z[5] = x[5];
z[6] = x[6];
z[7] = x[7];
z[8] = x[8];
}
public static void copy64(long[] x, int xOff, long[] z, int zOff)
{
z[zOff + 0] = x[xOff + 0];
z[zOff + 1] = x[xOff + 1];
z[zOff + 2] = x[xOff + 2];
z[zOff + 3] = x[xOff + 3];
z[zOff + 4] = x[xOff + 4];
z[zOff + 5] = x[xOff + 5];
z[zOff + 6] = x[xOff + 6];
z[zOff + 7] = x[xOff + 7];
z[zOff + 8] = x[xOff + 8];
}
public static long[] create64()
{
return new long[9];
}
public static long[] createExt64()
{
return new long[18];
}
public static boolean eq64(long[] x, long[] y)
{
for (int i = 8; i >= 0; --i)
{
if (x[i] != y[i])
{
return false;
}
}
return true;
}
public static long[] fromBigInteger64(BigInteger x)
{
if (x.signum() < 0 || x.bitLength() > 576)
{
throw new IllegalArgumentException();
}
long[] z = create64();
// NOTE: Use a fixed number of loop iterations
for (int i = 0; i < 9; ++i)
{
z[i] = x.longValue();
x = x.shiftRight(64);
}
return z;
}
public static boolean isOne64(long[] x)
{
if (x[0] != 1L)
{
return false;
}
for (int i = 1; i < 9; ++i)
{
if (x[i] != 0L)
{
return false;
}
}
return true;
}
public static boolean isZero64(long[] x)
{
for (int i = 0; i < 9; ++i)
{
if (x[i] != 0L)
{
return false;
}
}
return true;
}
public static BigInteger toBigInteger64(long[] x)
{
byte[] bs = new byte[72];
for (int i = 0; i < 9; ++i)
{
long x_i = x[i];
if (x_i != 0L)
{
Pack.longToBigEndian(x_i, bs, (8 - i) << 3);
}
}
return new BigInteger(1, bs);
}
}