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base64.cpp:39:44: error: invalid conversion from ‘const void*’ to ‘void*’ [-fpermissive]
   BIO *bio = BIO_new_mem_buf(b64message, -1)

g++ --version
g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)
Copyright (C) 2015 Free Software Foundation, Inc.

	string aes_encode(string _data, string _key, string _iv) {
		Crypto crypto;
		unsigned char *_aes_decode = NULL;
		// key
		int _key_code = crypto.setAesKey((unsigned char*)_key.c_str(), _key.size());
		if (_key_code == -1) return to_string(_key_code);
		// iv
		int _iv_code = crypto.setAesIv((unsigned char*)_iv.c_str(), _iv.size());
		if (_iv_code == -1) return to_string(_iv_code);
		// aes
		int _aes_encode_size = crypto.aesEncrypt((const unsigned char*)_data.c_str(), _data.size() + 1, &_aes_decode);
		if (_aes_encode_size == -1) return "";
		// base64 【The string generated here has a certain chance of being garbled.】
		char *_base64_encode = base64Encode(_aes_decode, _aes_encode_size);
		// result
		string _str_data = _base64_encode;
		free(_aes_decode);
		_aes_decode = NULL;
		return _str_data;
	}

	string aes_decode(string _base64_encode, string _key, string _iv) {
		Crypto crypto;
		unsigned char *_aes_encode = NULL;
		unsigned char *_aes_decode = NULL;
		// key
		int _key_code = crypto.setAesKey((unsigned char*)_key.c_str(), _key.size());
		if (_key_code == -1) return to_string(_key_code);
		// iv
		int _iv_code = crypto.setAesIv((unsigned char*)_iv.c_str(), _iv.size());
		if (_iv_code == -1) return to_string(_iv_code);
		// base64
		int _aes_encode_size = base64Decode(_base64_encode.c_str(), _base64_encode.size(), (unsigned char**)&_aes_encode);
		if (_aes_encode_size == -1) return "";
		// aes
		int _aes_decode_size = crypto.aesDecrypt((unsigned char*)_aes_encode, _aes_encode_size, (unsigned char**)&_aes_decode);
		if (_aes_decode_size == -1) return "";
		// result
		string _str_data = (char*)_aes_decode;
		free(_aes_encode);
		free(_aes_decode);
		_aes_decode = NULL;
		_aes_encode = NULL;
		return _str_data.substr(0, _aes_decode_size); // 【It must be intercepted in order to avoid garbled.】
	}