javax.crypto.AEADBadTagException: Tag mismatch! at com.sun.crypto.provider.GaloisCounterMode.decryptFinal(GaloisCounterMode.java:578) at com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1116) at com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1053) at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853) at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446) at javax.crypto.Cipher.doFinal(Cipher.java:2164) 如题，按照官方的文档执行也是这样，所有参数都有了，包括APIv3秘钥，依然报错 调用的URL是：https://api.mch.weixin.qq.com/v3/certificates 解密代码： private static String aesgcmDecrypt(String aad, String iv, String cipherText) throws Exception {  final Cipher cipher = Cipher.getInstance(ALGORITHM, "SunJCE");  SecretKeySpec key = new SecretKeySpec(AES_APIV3_KEY.getBytes(), "AES");  GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, iv.getBytes());  cipher.init(Cipher.DECRYPT_MODE, key, spec);  cipher.updateAAD(aad.getBytes());  return new String(cipher.doFinal(Base64.getDecoder().decode(cipherText)));  }