/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.codec.digest;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.concurrent.ThreadLocalRandom;
  
  import org.junit.jupiter.api.Test;
  
  public class Md5CryptTest {
  
      @Test
      public void testCtor() {
          assertNotNull(new Md5Crypt()); // for code-coverage
      }
  
      @Test
      public void testMd5CryptBytes() {
          // An empty Bytearray equals an empty String
          assertEquals("$1$foo$9mS5ExwgIECGE5YKlD5o91", Crypt.crypt(new byte[0], "$1$foo"));
          // UTF-8 stores \u00e4 "a with dieresis" as two bytes 0xc3 0xa4.
          assertEquals("$1$./$52agTEQZs877L9jyJnCNZ1", Crypt.crypt("t\u00e4st", "$1$./$"));
          // ISO-8859-1 stores "a with dieresis" as single byte 0xe4.
          assertEquals("$1$./$J2UbKzGe0Cpe63WZAt6p//", Crypt.crypt("t\u00e4st".getBytes(StandardCharsets.ISO_8859_1), "$1$./$"));
      }
  
      @Test
      public void testMd5CryptExplicitCall() {
          assertTrue(Md5Crypt.md5Crypt("secret".getBytes()).matches("^\\$1\\$[a-zA-Z0-9./]{0,8}\\$.{1,}$"));
          assertTrue(Md5Crypt.md5Crypt("secret".getBytes(), (String) null).matches("^\\$1\\$[a-zA-Z0-9./]{0,8}\\$.{1,}$"));
      }
  
      @Test
      public void testMd5CryptExplicitCallWithThreadLocalRandom() {
          final ThreadLocalRandom threadLocalRandom = ThreadLocalRandom.current();
          assertTrue(Md5Crypt.md5Crypt("secret".getBytes(), threadLocalRandom).matches("^\\$1\\$[a-zA-Z0-9./]{0,8}\\$.{1,}$"));
          assertTrue(Md5Crypt.md5Crypt("secret".getBytes(), (String) null).matches("^\\$1\\$[a-zA-Z0-9./]{0,8}\\$.{1,}$"));
      }
  
      @Test
      public void testMd5CryptLongInput() {
          assertEquals("$1$1234$MoxekaNNUgfPRVqoeYjCD/", Crypt.crypt("12345678901234567890", "$1$1234"));
      }
  
      @Test
      public void testMd5CryptNullData() {
          assertThrows(NullPointerException.class, () -> Md5Crypt.md5Crypt((byte[]) null));
      }
  
      @Test
      public void testMd5CryptStrings() {
          // empty data
          assertEquals("$1$foo$9mS5ExwgIECGE5YKlD5o91", Crypt.crypt("", "$1$foo"));
          // salt gets cut at dollar sign
          assertEquals("$1$1234$ImZYBLmYC.rbBKg9ERxX70", Crypt.crypt("secret", "$1$1234"));
          assertEquals("$1$1234$ImZYBLmYC.rbBKg9ERxX70", Crypt.crypt("secret", "$1$1234$567"));
          assertEquals("$1$1234$ImZYBLmYC.rbBKg9ERxX70", Crypt.crypt("secret", "$1$1234$567$890"));
          // salt gets cut at maximum length
          assertEquals("$1$12345678$hj0uLpdidjPhbMMZeno8X/", Crypt.crypt("secret", "$1$1234567890123456"));
          assertEquals("$1$12345678$hj0uLpdidjPhbMMZeno8X/", Crypt.crypt("secret", "$1$123456789012345678"));
      }
  
      @Test
      public void testMd5CryptWithEmptySalt() {
          assertThrows(IllegalArgumentException.class, () -> Md5Crypt.md5Crypt("secret".getBytes(), ""));
      }
  
      @Test
      public void testZeroOutInput() {
          final byte[] buffer = new byte[200];
          Arrays.fill(buffer, (byte) 'A');
          Md5Crypt.md5Crypt(buffer);
          // input password is 0-filled on return
          assertArrayEquals(new byte[buffer.length], buffer);
      }
  
  }