Java中解密微信加密数据工具类
当我们开发微信公众号,小程序等,微信返回给我们的数据往往是经过加密的,我们需要使用 sessionKey 配合解密,才能得到我们想要的数据
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.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("----------解密微信数据成功----------"); return JSONObject.parseObject(result); } } } catch (Exception e) { e.printStackTrace(); log.info("----------解密微信数据失败----------"); } return null; } }
这样,我们将微信加密的数据,转化成了 JSON 对象,就得到了我们想要的数据了
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