java 采用MD5加密解密

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转自：http://blog.csdn.net/xiangsuixinsheng/article/details/6871868

package endecrypt;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * 采用MD5加密解密 * @author tfq * @datetime 2011-10-13 */public class MD5Util {/**** MD5加码 生成32位md5码*/public static String string2MD5(String inStr){MessageDigest md5 = null;try{md5 = MessageDigest.getInstance("MD5");}catch (Exception e){System.out.println(e.toString());e.printStackTrace();return "";}char[] charArray = inStr.toCharArray();byte[] byteArray = new byte[charArray.length];for (int i = 0; i < charArray.length; i++)byteArray[i] = (byte) charArray[i];byte[] md5Bytes = md5.digest(byteArray);StringBuffer hexValue = new StringBuffer();for (int i = 0; i < md5Bytes.length; i++){int val = ((int) md5Bytes[i]) & 0xff;if (val < 16)hexValue.append("0");hexValue.append(Integer.toHexString(val));}return hexValue.toString();}/*** 加密解密算法 执行一次加密，两次解密*/ public static String convertMD5(String inStr){char[] a = inStr.toCharArray();for (int i = 0; i < a.length; i++){a[i] = (char) (a[i] ^ 't');}String s = new String(a);return s;}// 测试主函数public static void main(String args[]) {String s = new String("tangfuqiang");System.out.println("原始：" + s);System.out.println("MD5后：" + string2MD5(s));System.out.println("加密的：" + convertMD5(s));System.out.println("解密的：" + convertMD5(convertMD5(s)));   }}

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