Java加密工具类

/*   * 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.ftpserver.util;    import java.security.MessageDigest;  import java.security.NoSuchAlgorithmException;    /**   * <strong>Internal class, do not use directly.</strong>   *    * String encryption utility methods.   *   * @author <a href="http://mina.apache.org">Apache MINA Project</a>   */  public class EncryptUtils {        /**       * Encrypt byte array.       */      public final static byte[] encrypt(byte[] source, String algorithm)              throws NoSuchAlgorithmException {          MessageDigest md = MessageDigest.getInstance(algorithm);          md.reset();          md.update(source);          return md.digest();      }        /**       * Encrypt string       */      public final static String encrypt(String source, String algorithm)              throws NoSuchAlgorithmException {          byte[] resByteArray = encrypt(source.getBytes(), algorithm);          return StringUtils.toHexString(resByteArray);      }        /**       * Encrypt string using MD5 algorithm       */      public final static String encryptMD5(String source) {          if (source == null) {              source = "";          }            String result = "";          try {              result = encrypt(source, "MD5");          } catch (NoSuchAlgorithmException ex) {              // this should never happen              throw new RuntimeException(ex);          }          return result;      }        /**       * Encrypt string using SHA algorithm       */      public final static String encryptSHA(String source) {          if (source == null) {              source = "";          }            String result = "";          try {              result = encrypt(source, "SHA");          } catch (NoSuchAlgorithmException ex) {              // this should never happen              throw new RuntimeException(ex);          }          return result;      }    }