/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed 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.springframework.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

/**
 * @author Arjen Poutsma
 * @author Juergen Hoeller
 */
public class DigestUtilsTests {

	private byte[] bytes;


	@Before
	public void createBytes() throws UnsupportedEncodingException {
		bytes = "Hello World".getBytes("UTF-8");
	}


	@Test
	public void md5() throws IOException {
		byte[] expected = new byte[]
				{-0x4f, 0xa, -0x73, -0x4f, 0x64, -0x20, 0x75, 0x41, 0x5, -0x49, -0x57, -0x65, -0x19, 0x2e, 0x3f, -0x1b};

		byte[] result = DigestUtils.md5Digest(bytes);
		assertArrayEquals("Invalid hash", expected, result);

		result = DigestUtils.md5Digest(new ByteArrayInputStream(bytes));
		assertArrayEquals("Invalid hash", expected, result);
	}

	@Test
	public void md5Hex() throws IOException {
		String expected = "b10a8db164e0754105b7a99be72e3fe5";

		String hash = DigestUtils.md5DigestAsHex(bytes);
		assertEquals("Invalid hash", expected, hash);

		hash = DigestUtils.md5DigestAsHex(new ByteArrayInputStream(bytes));
		assertEquals("Invalid hash", expected, hash);
	}

	@Test
	public void md5StringBuilder() throws IOException {
		String expected = "b10a8db164e0754105b7a99be72e3fe5";

		StringBuilder builder = new StringBuilder();
		DigestUtils.appendMd5DigestAsHex(bytes, builder);
		assertEquals("Invalid hash", expected, builder.toString());

		builder = new StringBuilder();
		DigestUtils.appendMd5DigestAsHex(new ByteArrayInputStream(bytes), builder);
		assertEquals("Invalid hash", expected, builder.toString());
	}

}
