一、錯誤提示:
Given final block not properly padded. Such issues can arise if a bad key is used during decryption.
二、原因
SecureRandom 這個對象在加密時完全會根據操作系統底層進行加密,導致linux下每次加密後的結果都不相同,無法進行解密。
三、解決辦法
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG") ;
secureRandom.setSeed(key.getBytes(charset));
kg.init(keysize, secureRandom);
使用SecureRandom 並制定編碼後,就能夠正常加密解密
四、附加密工具類
package com.lenovo.mt.utils;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.util.Objects;
public class UrlCompressUtils {
private static final String DES = "DES";
private static final int keysizeDES = 56;
private static final String KEY = "9de1cdaa-0bea-4d1d-935c-af9559d2dd76";
public UrlCompressUtils() {
}
public static String dESencode(String res) {
return keyGeneratorES(res, true);
}
public static String dESdecode(String res) {
return keyGeneratorES(res, false);
}
private static String parseByte2HexStr(byte[] buf) {
StringBuilder sb = new StringBuilder();
for (byte b : buf) {
String hex = Integer.toHexString(b & 255);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
private static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1) {
return null;
} else {
byte[] result = new byte[hexStr.length() / 2];
for(int i = 0; i < hexStr.length() / 2; ++i) {
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
result[i] = (byte)(high * 16 + low);
}
return result;
}
}
private static String keyGeneratorES(String res, boolean isEncode) {
try {
KeyGenerator kg = KeyGenerator.getInstance(DES);
String charset = "utf-8";
if (UrlCompressUtils.keysizeDES == 0) {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG") ;
secureRandom.setSeed(UrlCompressUtils.KEY.getBytes(charset));
kg.init(UrlCompressUtils.keysizeDES, secureRandom);
} else {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG") ;
secureRandom.setSeed(UrlCompressUtils.KEY.getBytes(charset));
kg.init(UrlCompressUtils.keysizeDES, secureRandom);
}
SecretKey sk = kg.generateKey();
SecretKeySpec sks = new SecretKeySpec(sk.getEncoded(), "DES");
Cipher cipher = Cipher.getInstance("DES");
if (isEncode) {
cipher.init(1, sks);
byte[] resBytes = res.getBytes(charset);
return parseByte2HexStr(cipher.doFinal(resBytes));
} else {
cipher.init(2, sks);
return new String(cipher.doFinal(Objects.requireNonNull(parseHexStr2Byte(res))));
}
} catch (Exception var10) {
var10.printStackTrace();
return null;
}
}
public static void main(String[] args) {
String url = "www.baidu.com";
String encode = UrlCompressUtils.dESencode(url);
System.out.println(encode);
String sdecode = UrlCompressUtils.dESdecode(encode);
System.out.println(sdecode);
}
}