EncryptUtils.java
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package com.canrd.webmagic.common.utils;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.nio.charset.StandardCharsets;
/**
* 加密
*
* @date 2018-11-23
*/
public class EncryptUtils {
private static String strParam = "Passw0rd";
private static Cipher cipher;
private static IvParameterSpec iv = new IvParameterSpec(strParam.getBytes(StandardCharsets.UTF_8));
private static DESKeySpec getDesKeySpec(String source) throws Exception {
if (source == null || source.length() == 0) {
return null;
}
cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
String strKey = "Passw0rd";
return new DESKeySpec(strKey.getBytes(StandardCharsets.UTF_8));
}
/**
* 对称加密
*/
public static String desEncrypt(String source) throws Exception {
DESKeySpec desKeySpec = getDesKeySpec(source);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return byte2hex(
cipher.doFinal(source.getBytes(StandardCharsets.UTF_8))).toUpperCase();
}
/**
* 对称解密
*/
public static String desDecrypt(String source) throws Exception {
byte[] src = hex2byte(source.getBytes());
DESKeySpec desKeySpec = getDesKeySpec(source);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(src);
return new String(retByte);
}
private static String byte2hex(byte[] inStr) {
String stmp;
StringBuilder out = new StringBuilder(inStr.length * 2);
for (byte b : inStr) {
stmp = Integer.toHexString(b & 0xFF);
if (stmp.length() == 1) {
// 如果是0至F的单位字符串，则添加0
out.append("0").append(stmp);
} else {
out.append(stmp);
}
}
return out.toString();
}
private static byte[] hex2byte(byte[] b) {
int size = 2;
if ((b.length % size) != 0) {
throw new IllegalArgumentException("长度不是偶数");
}
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += size) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}
}