Des算法通用类
import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.security.spec.InvalidKeySpecException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * DES 算法 * * @author Fu Wei * */public class DesUtils {private static final Logger LOG = LoggerFactory.getLogger(DesUtils.class);private final static String DES = "DES";private static final String ENCODE = "UTF-8";private static final String DECODE = "UTF-8";/** * 加密String明文输入,String密文输出 * * @param strMing * String明文 * @return String密文 * @throws DesException */public static String getEncString(String strMing, byte[] byteKey) {byte[] byteMi = null;byte[] byteMing = null;String strMi = null;try {byteMing = strMing.getBytes(ENCODE);byteMi = encrypt(byteMing, byteKey);strMi = Base64Utils.encode(byteMi);} catch (UnsupportedEncodingException e) {LOG.error("不支持的编码",e);}return strMi;}/** * 解密 以String密文输入,String明文输出 * * @param strMi * String密文 * @return String明文 */public static String getDesString(String strMi, byte[] byteKey) {byte[] byteMing = null;byte[] byteMi = null;String strMing = null;try {byteMi = Base64Utils.decode(strMi);byteMing = decrypt(byteMi, byteKey);strMing = new String(byteMing, DECODE);} catch (Exception e) {LOG.error("获取Des错误",e);}return strMing;}/** * 加密 * * @param src * 数据源 * @param key * 密钥，长度必须是8的倍数 * @return 返回加密后的数据 * @throws DesException */public static byte[] encrypt(byte[] src, byte[] key) {// DES算法要求有一个可信任的随机数源SecureRandom sr = new SecureRandom();try {// 从原始密匙数据创建DESKeySpec对象DESKeySpec dks = new DESKeySpec(key);// 创建一个密匙工厂，然后用它把DESKeySpec转换成// 一个SecretKey对象SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);SecretKey securekey = keyFactory.generateSecret(dks);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance(DES);// 用密匙初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);// 现在，获取数据并加密// 正式执行加密操作return cipher.doFinal(src);} catch (NoSuchAlgorithmException e) {LOG.error("算数错误",e);} catch (InvalidKeyException e) {LOG.error("无效key错误",e);} catch (InvalidKeySpecException e) {LOG.error("无效key戳无",e);} catch (NoSuchPaddingException e) {LOG.error("填充错误",e);} catch (IllegalBlockSizeException e) {LOG.error("非法数据块",e);} catch (BadPaddingException e) {LOG.error("错误的填充",e);}return null;} /** * 解密 * * @param src * 数据源 * @param key * 密钥，长度必须是8的倍数 * @return 返回解密后的原始数据 * @throws DesException * @throws Exception */public static byte[] decrypt(byte[] src, byte[] key) {// DES算法要求有一个可信任的随机数源SecureRandom sr = new SecureRandom();try {// 从原始密匙数据创建一个DESKeySpec对象DESKeySpec dks = new DESKeySpec(key);// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成// 一个SecretKey对象SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);SecretKey securekey = keyFactory.generateSecret(dks);// Cipher对象实际完成解密操作Cipher cipher = Cipher.getInstance(DES);// 用密匙初始化Cipher对象cipher.init(Cipher.DECRYPT_MODE, securekey, sr);// 现在，获取数据并解密// 正式执行解密操作return cipher.doFinal(src);} catch (NoSuchAlgorithmException e) {LOG.error("算数错误",e);} catch (InvalidKeyException e) {LOG.error("无效key错误",e);} catch (InvalidKeySpecException e) {LOG.error("无效key戳无",e);} catch (NoSuchPaddingException e) {LOG.error("填充错误",e);} catch (IllegalBlockSizeException e) {LOG.error("非法数据块",e);} catch (BadPaddingException e) {LOG.error("错误的填充",e);}return null;}}?