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package common.utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
/**
* DES加密。
* create by mulin on 2018/11/28.
*
* 注：密钥必须为8位。默认密钥为A1B4C2D3。
*/
public class DESUtil {
public static String key = "A1B4C2D3";
private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";
private static SecretKey keyGenerator(String keyStr) throws Exception {
DESKeySpec desKey = new DESKeySpec(keyStr.getBytes("UTF-8")); //DESKeySpec
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
return keyFactory.generateSecret(desKey);
}
/**
* 加密
*
* @param data
* @param key 长度必须为8位
* @return
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
Key deskey = keyGenerator(key);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, deskey, iv);
byte[] results = cipher.doFinal(data.getBytes("UTF-8"));
return Base64.encodeBase64String(results);
}
/**
* 加密
*
* @param data
* @return
* @throws Exception
*/
public static String encrypt(String data) throws Exception {
return encrypt(data, key);
}
/**
* 解密
*
* @param data
* @param key 密钥长度为8位
* @return
* @throws Exception
*/
public static String decrypt(String data, String key) throws Exception {
Key deskey = keyGenerator(key);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, deskey, iv);
return new String(cipher.doFinal(Base64.decodeBase64(data)));
}
/**
* 解密
*
* @param data
* @return
* @throws Exception
*/
public static String decrypt(String data) throws Exception {
return decrypt(data, key);
}
}