遇到的问题如下：
主要就是C#和JAVA中的DES不一致的问题。
-
是C#采用CBC Mode，PKCS7 Padding, Java采用CBC Mode，PKCS5Padding Padding,
-
是C#采用ECB Mode，PKCS7 Padding, Java采用ECB Mode，PKCS5Padding Padding,
C#的ECB有IV向量，JAVA中的ECB不支持向量。
在实际解决中我采用了DES/CBC/PKCS5Padding的方式，把C#的IV向量和Key公用同一个加密字符串。在C#和JAVA中都转为16进制的加密串，解决匹配不上的问题。最后封一层base64。
C#：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace BiHu.BaoXian.Service.Database.Extension
{
/** DES加密解密
* @author liucx
* @description DES+base64加密解密
*/
public static class EncodHelper
{
#region DESEnCode DES加密
public static string DESEnCode(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);
//建立加密对象的密钥和偏移量
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
//使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
//16进制
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
//完成加密后再转一次base64
byte[] bytes = Encoding.UTF8.GetBytes(ret.ToString());
var result = Convert.ToBase64String(bytes);
return result;
}
#endregion
#region DESDeCode DES解密
public static string DESDeCode(string code, string sKey)
{
//解密先转码base64
var pToDecrypt = Encoding.UTF8.GetString(Convert.FromBase64String(code));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.UTF8.GetString(ms.ToArray());
}
#endregion
}
}
JAVA：
package com.iflytek.test;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import org.apache.commons.codec.binary.Base64;
public class DESUtils {
/**
* 密钥
*/
public static final String DEFAULT_KEY = "liucx2018";
/**
* 加密
*
* @param message
* @param key
* @return
*/
public static byte[] encrypt(String message, String key) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return cipher.doFinal(message.getBytes("UTF-8"));
}
/**
* 加密，方式为先DES加密， 再base64转码的字符串
* @param message
* @param key
* @return
*/
public static String encrypt_base64(String message, String key) throws Exception {
String a = toHexString(encrypt(message, key)).toUpperCase();
String base64message = new String(Base64.encodeBase64(a.getBytes("UTF-8")));
return base64message;
}
/**
* 解密
*
* @param message
* 加密后的内容
* @param key
* 密钥
* @return
*/
public static String decrypt(String message, String key) throws Exception {
byte[] bytesrc = convertHexString(message);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte, "UTF-8");
}
/**
* 解密，方式为先解码base64，再解密，转成正常字符串
*
* @param base64message base64编码的密文
* @param key 密钥
* @return 解密后的文本
*/
public static String decrypt_base64(String base64message, String key) throws Exception {
String message = new String(Base64.decodeBase64(base64message.getBytes("UTF-8")));
String result = decrypt(message, key);
return result;
}
/**
* 转成16进制
*
* @param b
* @return
*/
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}
return hexString.toString();
}
public static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
}
return digest;
}
}
Android Studio 需添加依赖库：implementation’apache-codec:commons-codec:1.2’