/**
* Tests {@link GroupElement#GroupElement(Curve, byte[])} and {@link GroupElement#toByteArray()}
* against valid public keys.
*/
@Test
public void testToAndFromByteArray() {
GroupElement t;
for (Ed25519TestVectors.TestTuple testCase : Ed25519TestVectors.testCases) {
t = new GroupElement(curve, testCase.pk);
assertThat(
"Test case " + testCase.caseNum + " failed", t.toByteArray(), is(equalTo(testCase.pk)));
}
}
@Test
public void constructorUsingByteArrayReturnsExpectedResult() {
for (int i = 0; i < 100; i++) {
// Arrange:
final GroupElement g = MathUtils.getRandomGroupElement();
final byte[] bytes = g.toByteArray();
// Act:
final GroupElement h1 = new GroupElement(curve, bytes);
final GroupElement h2 = MathUtils.toGroupElement(bytes);
// Assert:
Assert.assertThat(h1, IsEqual.equalTo(h2));
}
}
@Test
public void toByteArrayReturnsExpectedResult() {
for (int i = 0; i < 100; i++) {
// Arrange:
final GroupElement g = MathUtils.getRandomGroupElement();
// Act:
final byte[] gBytes = g.toByteArray();
final byte[] bytes = MathUtils.toByteArray(MathUtils.toBigInteger(g.getY()));
if (MathUtils.toBigInteger(g.getX()).mod(new BigInteger("2")).equals(BigInteger.ONE)) {
bytes[31] |= 0x80;
}
// Assert:
Assert.assertThat(Arrays.equals(gBytes, bytes), IsEqual.equalTo(true));
}
}