首先需要引入依赖 bcprov-jdk15on
maven版本：
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.66</version>
</dependency>
gradle版本：
implementation("org.bouncycastle:bcprov-jdk15on:1.66")
解密工具类：
import com.alibaba.fastjson.JSON;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
import java.util.HashMap;
import java.util.Map;
public class AesCBC {
public static boolean initialized =false;
/**
* AES解密
* @param content 密文
* @return
* @throws InvalidAlgorithmParameterException
* @throws NoSuchProviderException
*/
public static byte[]decrypt(byte[] content,byte[] keyByte,byte[] ivByte)throws InvalidAlgorithmParameterException {
initialize();
try {
Cipher cipher =Cipher.getInstance("AES/CBC/PKCS7Padding");
Key sKeySpec =new SecretKeySpec(keyByte,"AES");
cipher.init(Cipher.DECRYPT_MODE,sKeySpec,generateIV(ivByte));// 初始化
byte[]result =cipher.doFinal(content);
return result;
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}catch (NoSuchPaddingException e) {
e.printStackTrace();
}catch (InvalidKeyException e) {
e.printStackTrace();
}catch (IllegalBlockSizeException e) {
e.printStackTrace();
}catch (BadPaddingException e) {
e.printStackTrace();
}catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/**
* 微信小程序用户信息解密
* @param encryptedData
* @param sessionKey
* @param iv
* @return
*/
public static String decrypt(String encryptedData,String sessionKey,String iv){
try {
byte[]resultByte =decrypt(Base64.decodeBase64(encryptedData),Base64.decodeBase64(sessionKey),Base64.decodeBase64(iv));
if(null !=resultByte &&resultByte.length >0){
String info =new String(resultByte,"UTF-8");
return info;
}
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static void initialize(){
if (initialized)return;
Security.addProvider(new BouncyCastleProvider());
initialized =true;
}
//生成iv
public static AlgorithmParameters generateIV(byte[] iv)throws Exception{
AlgorithmParameters params =AlgorithmParameters.getInstance("AES");
params.init(new IvParameterSpec(iv));
return params;
}
public static void main(String[] args) {
String encryptedData,sessionKey,iv,appId;
encryptedData =加密字符串内容;
sessionKey ="小程序sessionkey";
iv ="小程序返回加密字符串同级的iv";
appId ="小程序appid";
String info =decrypt(encryptedData,sessionKey,iv);
System.out.println(info);
}
}
解密结果：{"phoneNumber":"18605137011","purePhoneNumber":"18605137011","countryCode":"86","watermark":{"timestamp":1599096570,"appid":"wx0198259b4c28f5a9"}}
