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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