FragmentEncryptedTest.java
a849cce6c01ams_access_migration

FragmentEncryptedTest.java
View Options

			package crypto.elgamal;

			import static org.junit.Assert.*;

			import java.math.BigInteger;

			import org.bouncycastle.asn1.nist.NISTNamedCurves;
			import org.junit.Test;

			public class FragmentEncryptedTest {

			@Test
			public void testAdd() {
			ECElGamal eccegScheme = new ECElGamal(NISTNamedCurves.getByName("P-384"));
			eccegScheme.initReverseDLTable();

			BigInteger msg1 = new BigInteger("4");
			BigInteger msg2 = new BigInteger("7");

			FragmentEncrypted fragEncrypted1 = eccegScheme.encrypt(msg1);
			FragmentEncrypted fragEncrypted2 = eccegScheme.encrypt(msg2);

			FragmentEncrypted fragSum = fragEncrypted1.add(fragEncrypted2);
			BigInteger sumDecrypted = eccegScheme.decrypt(fragSum);

			assertTrue("Addition homomorphic", sumDecrypted.equals(msg1.add(msg2)));
			}

			@Test
			public void testScale() {
			ECElGamal eccegScheme = new ECElGamal(NISTNamedCurves.getByName("P-384"));
			eccegScheme.initReverseDLTable();

			BigInteger msg = new BigInteger("7");
			BigInteger s = new BigInteger("3");

			FragmentEncrypted frag = eccegScheme.encrypt(msg);
			FragmentEncrypted fragScaled = frag.scale(s);
			BigInteger msgScaled = eccegScheme.decrypt(fragScaled);

			assertTrue("Scale homomorphic", msgScaled.equals(msg.multiply(s)));
			}

			}