Added MD5 hashing utils.

org.springframework.core/src/test/java/org/springframework/util/Md5HashUtilsTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright ${YEAR} 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.UnsupportedEncodingException;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import org.junit.Before;
+import org.junit.Test;
+
+public class Md5HashUtilsTests {
+
+	private byte[] bytes;
+
+	@Before
+	public void createBytes() throws UnsupportedEncodingException {
+		bytes = "Hello World".getBytes("UTF-8");
+	}
+
+	@Test
+	public void hash() {
+		byte[] result = Md5HashUtils.getHash(bytes);
+		byte[] expected = new byte[]{-0x4f, 0xa, -0x73, -0x4f, 0x64, -0x20, 0x75, 0x41, 0x5, -0x49, -0x57, -0x65, -0x19,
+				0x2e, 0x3f, -0x1b};
+		assertArrayEquals("Invalid hash", expected, result);
+	}
+
+	@Test
+	public void hashString() throws UnsupportedEncodingException {
+		String hash = Md5HashUtils.getHashString(bytes);
+		assertEquals("Invalid hash", "b10a8db164e0754105b7a99be72e3fe5", hash);
+	}
+
+	@Test
+	public void hashStringBuilder() throws UnsupportedEncodingException {
+		StringBuilder builder = new StringBuilder();
+		Md5HashUtils.appendHashString(bytes, builder);
+		assertEquals("Invalid hash", "b10a8db164e0754105b7a99be72e3fe5", builder.toString());
+	}
+
+
+}