java DES生成密钥加密解密

java DES生成密钥加密解密

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.springframework.stereotype.Component;

@Component
public class DES{
    public byte[] bytes;
    
    //生成一个DES密钥
    public String getKey(){
        try {
            KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
			keyGenerator.init(56);
			// 生成一个Key
			SecretKey generateKey = keyGenerator.generateKey();
			// 转变为字节数组
			byte[] encoded = generateKey.getEncoded();
			// 生成密钥字符串
            String encodeHexString = Hex.encodeHexString(encoded);
			return encodeHexString;
        } catch (Exception e) {
            e.printStackTrace();
            return "密钥生成错误.";
        }   
    }
    
	//加密
    public String encryptor(String str,String Key){
        String s=null;
        try {
            DESKeySpec desKey = new DESKeySpec(Key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE,securekey);    //初始化密码器，用密钥 secretKey 进入加密模式
            byte[] bytes=cipher.doFinal(str.getBytes());   //加密
            s= Base64.encodeBase64String(bytes);
        } catch (Exception e) {
            e.printStackTrace();
            return "加密错误.";
        }
        return s;
    }   

	//解密
    public String decryptor(String buff,String Key){
        String s=null;
        try {
            DESKeySpec desKey = new DESKeySpec(Key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE,securekey);
            byte[] responseByte=cipher.doFinal(Base64.decodeBase64(buff));
            s=new String(responseByte);
            return s;
        } catch (Exception e) {
            e.printStackTrace();
            return "解密错误.";
        }
    }
}