cn.binarywang.wx.miniapp.util.crypt.WxMaCryptUtils Maven / Gradle / Ivy
package cn.binarywang.wx.miniapp.util.crypt;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.Security;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import com.google.common.base.CharMatcher;
import com.google.common.io.BaseEncoding;
import me.chanjar.weixin.common.error.WxRuntimeException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import cn.binarywang.wx.miniapp.config.WxMaConfig;
import me.chanjar.weixin.common.util.crypto.PKCS7Encoder;
/**
* @author Binary Wang
*/
public class WxMaCryptUtils extends me.chanjar.weixin.common.util.crypto.WxCryptUtil {
private static final Charset UTF_8 = StandardCharsets.UTF_8;
public WxMaCryptUtils(WxMaConfig config) {
this.appidOrCorpid = config.getAppid();
this.token = config.getToken();
this.aesKey = java.util.Base64.getDecoder().decode(StringUtils.remove(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 WxRuntimeException("AES解密失败！", e);
}
}
/**
* AES解密.
*
* @param sessionKey session_key
* @param encryptedData 消息密文
* @param ivStr iv字符串
*/
public static String decryptAnotherWay(String sessionKey, String encryptedData, String ivStr) {
byte[] keyBytes = Base64.decodeBase64(sessionKey.getBytes(UTF_8));
int base = 16;
if (keyBytes.length % base != 0) {
int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);
byte[] temp = new byte[groups * base];
Arrays.fill(temp, (byte) 0);
System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
keyBytes = temp;
}
Security.addProvider(new BouncyCastleProvider());
Key key = new SecretKeySpec(keyBytes, "AES");
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(Base64.decodeBase64(ivStr.getBytes(UTF_8))));
return new String(cipher.doFinal(Base64.decodeBase64(encryptedData.getBytes(UTF_8))), UTF_8);
} catch (Exception e) {
throw new WxRuntimeException("AES解密失败！", e);
}
}
}