关于java:Java中解密微信加密数据工具类

当咱们开发微信公众号，小程序等，微信返回给咱们的数据往往是通过加密的，咱们须要应用 sessionKey 配合解密，能力失去咱们想要的数据
1、引入依赖
<!– lombok 依赖 –>
<dependency>

<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>

</dependency>
<!– alibaba 的 fastjson –>
<dependency>

<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.60</version>

</dependency>
<!– 工具包 –>
<dependency>

<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>

</dependency>
<!– rsa 加密工具 –>
<dependency>

<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.55</version>

</dependency>
2、解密工具类
import com.alibaba.fastjson.JSONObject;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Security;
import java.util.Arrays;
/**

• 解密微信加密数据工具类
  */

@Slf4j
public class WechatUtils {

/**
 * 解密微信加密数据
 *
 * @param encryptedData
 * @param iv
 * @param sessionkey
 * @return
 */
public static JSONObject decryptWechatData(String encryptedData, String iv, String sessionkey) {
    // 被加密的数据
    byte[] dataByte = Base64.decode(encryptedData);
    // 加密秘钥
    byte[] keyByte = Base64.decode(sessionkey);
    // 偏移量
    byte[] ivByte = Base64.decode(iv);
    try {
        int base = 16;
        if (keyByte.length % base != 0) {int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
            byte[] temp = new byte[groups * base];
            Arrays.fill(temp, (byte) 0);
            System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
            keyByte = temp;
        }
        Security.addProvider(new BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
        SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
        AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
        parameters.init(new IvParameterSpec(ivByte));
        cipher.init(Cipher.[Skrill 下载](https://www.gendan5.com/wallet/Skrill.html)DECRYPT_MODE, spec, parameters);
        byte[] resultByte = cipher.doFinal(dataByte);
        if (null != resultByte && resultByte.length > 0) {String result = new String(resultByte, "UTF-8");
            if (StringUtils.isNotBlank(result)) {log.info("---------- 解密微信数据胜利 ----------");
                return JSONObject.parseObject(result);
            }
        }
    } catch (Exception e) {e.printStackTrace();
        log.info("---------- 解密微信数据失败 ----------");
    }
    return null;
}

}