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package org.spongycastle.util.utiltest;
import java.math.BigInteger;
import junit.framework.Assert;
import junit.framework.TestCase;
import org.spongycastle.util.Arrays;
import org.spongycastle.util.BigIntegers;
import org.spongycastle.util.IPAddress;
import org.spongycastle.util.encoders.Hex;
public class BigIntegersTest
extends TestCase
{
public String getName()
{
return "BigIntegers";
}
public void testAsUnsignedByteArray()
{
BigInteger a = new BigInteger(1, Hex.decode("ff12345678"));
byte[] a5 = BigIntegers.asUnsignedByteArray(a);
Assert.assertEquals(5, a5.length);
Assert.assertTrue(Arrays.areEqual(a5, Hex.decode("ff12345678")));
BigInteger b = new BigInteger(1, Hex.decode("0f12345678"));
byte[] b5 = BigIntegers.asUnsignedByteArray(b);
Assert.assertEquals(5, b5.length);
Assert.assertTrue(Arrays.areEqual(b5, Hex.decode("0f12345678")));
}
public void testFixedLengthUnsignedByteArray()
{
BigInteger a = new BigInteger(1, Hex.decode("ff12345678"));
byte[] a5 = BigIntegers.asUnsignedByteArray(5, a);
Assert.assertEquals(5, a5.length);
Assert.assertTrue(Arrays.areEqual(a5, Hex.decode("ff12345678")));
byte[] a6 = BigIntegers.asUnsignedByteArray(6, a);
Assert.assertEquals(6, a6.length);
Assert.assertEquals(0, a6[0]);
Assert.assertTrue(Arrays.areEqual(a6, Hex.decode("00ff12345678")));
BigInteger b = new BigInteger(1, Hex.decode("0f12345678"));
byte[] b5 = BigIntegers.asUnsignedByteArray(5, b);
Assert.assertEquals(5, b5.length);
Assert.assertTrue(Arrays.areEqual(b5, Hex.decode("0f12345678")));
byte[] b6 = BigIntegers.asUnsignedByteArray(6, b);
Assert.assertEquals(6, b6.length);
Assert.assertEquals(0, b6[0]);
Assert.assertTrue(Arrays.areEqual(b6, Hex.decode("000f12345678")));
BigInteger c = new BigInteger(1, Hex.decode("ff123456789a"));
try
{
byte[] c5 = BigIntegers.asUnsignedByteArray(5, c);
fail("no exception thrown");
}
catch (IllegalArgumentException e)
{
// ignore
}
BigInteger d = new BigInteger(1, Hex.decode("0f123456789a"));
try
{
byte[] c5 = BigIntegers.asUnsignedByteArray(5, d);
fail("no exception thrown");
}
catch (IllegalArgumentException e)
{
// ignore
}
}
}
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