DES加密解密类

public class DESUtil {
private static final Logger logger = LoggerFactory.getLogger(DESUtil.class);

private static Key key;
//设置秘钥key
private static String KEY_STR="LQT_WS";
private static String CHARSETNAME="UTF-8";
private static String ALGORITHM="DES";static{try{//生成DES算法对象KeyGenerator generator=KeyGenerator.getInstance(ALGORITHM);//运用SHA1安全策略SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");//设置上密钥种子secureRandom.setSeed(KEY_STR.getBytes());//初始化基于SHA1的算法对象generator.init(secureRandom);//生成密钥对象key=generator.generateKey();generator=null;}catch(Exception e){throw new RuntimeException(e);}
}/*** 获取加密的信息* @param str* @return*/
public static String getEncryptString(String str){//基于BASE64编码，接收byte[]并转换成StringBase64 base64 = new Base64();try {// 按UTF8编码byte[] bytes = str.getBytes(CHARSETNAME);// 获取加密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化密码信息cipher.init(Cipher.ENCRYPT_MODE, key);// 加密byte[] doFinal = cipher.doFinal(bytes);// byte[]to encode好的String并返回return base64.encodeToString(doFinal).trim();} catch (Exception e) {throw new RuntimeException(e);}
}/*** 获取解密之后的信息* * @param str* @return*/
public static String getDecryptString(String str) {// 基于BASE64编码，接收byte[]并转换成StringBase64 base64decoder = new Base64();try {// 将字符串decode成byte[]byte[] bytes = base64decoder.decode(str);// 获取解密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化解密信息cipher.init(Cipher.DECRYPT_MODE, key);// 解密byte[] doFinal = cipher.doFinal(bytes);// 返回解密之后的信息return new String(doFinal, CHARSETNAME);} catch (Exception e) {throw new RuntimeException(e);}
}

}