/*
    * Copyright (C) 2021, Thomas Wolf <thomas.wolf@paranor.ch> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.gpg.bc.internal.keys;
  
  import static org.junit.Assert.assertEquals;
  
  import java.math.BigInteger;
  import java.util.Locale;
  
  import org.bouncycastle.openpgp.PGPException;
  import org.bouncycastle.util.encoders.Hex;
  import org.eclipse.jgit.util.sha1.SHA1;
  import org.junit.Test;
  
  public class KeyGrip25519Test {
  
  	interface Hash {
  		byte[] hash(SHA1 sha, BigInteger q) throws PGPException;
  	}
  
  	private void assertKeyGrip(String key, String expectedKeyGrip, Hash hash)
  			throws Exception {
  		SHA1 grip = SHA1.newInstance();
  		grip.setDetectCollision(false);
  		BigInteger pk = new BigInteger(key, 16);
  		byte[] keyGrip = hash.hash(grip, pk);
  		assertEquals("Keygrip should match", expectedKeyGrip,
  				Hex.toHexString(keyGrip).toUpperCase(Locale.ROOT));
  	}
  
  	@Test
  	public void testCompressed() throws Exception {
  		assertKeyGrip("40"
  				+ "773E72848C1FD5F9652B29E2E7AF79571A04990E96F2016BF4E0EC1890C2B7DB",
  				"9DB6C64A38830F4960701789475520BE8C821F47",
  				KeyGrip::hashEd25519);
  	}
  
  	@Test
  	public void testCompressedNoPrefix() throws Exception {
  		assertKeyGrip(
  				"773E72848C1FD5F9652B29E2E7AF79571A04990E96F2016BF4E0EC1890C2B7DB",
  				"9DB6C64A38830F4960701789475520BE8C821F47",
  				KeyGrip::hashEd25519);
  	}
  
  	@Test
  	public void testCurve25519() throws Exception {
  		assertKeyGrip("40"
  				+ "918C1733127F6BF2646FAE3D081A18AE77111C903B906310B077505EFFF12740",
  				"0F89A565D3EA187CE839332398F5D480677DF49C",
  				KeyGrip::hashCurve25519);
  	}
  }