/** * 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)); } }