me.chanjar.weixin.channel.util.WxChCryptUtils Maven / Gradle / Ivy
package me.chanjar.weixin.channel.util;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.AlgorithmParameters;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.channel.config.WxChannelConfig;
import me.chanjar.weixin.common.util.crypto.PKCS7Encoder;
import me.chanjar.weixin.common.util.crypto.WxCryptUtil;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
/**
* @author Zeyes
*/
@Slf4j
public class WxChCryptUtils extends WxCryptUtil {
protected static final Charset UTF_8 = StandardCharsets.UTF_8;
public WxChCryptUtils(WxChannelConfig config) {
this.appidOrCorpid = config.getAppid();
this.token = config.getToken();
this.aesKey = Base64.decodeBase64(StringUtils.trim(config.getAesKey()) + "=");
}
/**
* AES解密
*
* @param sessionKey session_key
* @param encryptedData 消息密文
* @param ivStr iv字符串
*/
public static String decrypt(String sessionKey, String encryptedData, String ivStr) {
try {
AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
params.init(new IvParameterSpec(Base64.decodeBase64(ivStr)));
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(Base64.decodeBase64(sessionKey), "AES"), params);
return new String(PKCS7Encoder.decode(cipher.doFinal(Base64.decodeBase64(encryptedData))), UTF_8);
} catch (Exception e) {
throw new RuntimeException("AES解密失败！", e);
}
}
}