下载平台证书接口成功后，在解密的过程中

Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");

SecretKeySpec key = new SecretKeySpec(aesKey, "AES");

GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, nonce);

cipher.init(Cipher.DECRYPT_MODE, key, spec); //运行这里报错

java.lang.IllegalArgumentException: java.security.InvalidKeyException: Illegal key size