592767809/export_music

从手机中导出解密的音乐

export_music's Issues

不依赖模拟器获取汽水音乐解密密钥

#include <iostream>
#include <cstdint>
#include <string>
#include <vector>
#include <algorithm>
#include <bitset>

// https://github.com/zaphoyd/websocketpp/blob/master/websocketpp/base64/base64.hpp
#include "base64.hpp"

uint8_t decode_base36(uint8_t c) {
	if (c >= '0' && c <= '9') {
		return c - '0';
	}
	if (c >= 'a' && c <= 'z') {
		return c - 'a' + 10;
	}
	return 0xff;
}

template<typename ItBegin, typename ItEnd>
inline void decrypt_spade_inner(ItBegin spade_key, ItEnd spade_key_end) {
	std::vector<uint8_t> buff(spade_key_end - spade_key + 2);
	buff[0] = 0xFA;
	buff[1] = 0x55;
	std::copy(spade_key, spade_key_end, buff.begin() + 2);

	const uint8_t* p_table = buff.data();
	for (uint32_t i = 0; spade_key < spade_key_end; spade_key++) {
		auto pop_count = static_cast<uint8_t>(std::bitset<32>(i).count()); // popcnt 指令
		*spade_key = (*spade_key ^ *p_table) - pop_count - 21;

		p_table++;
		i++;
	}
}

template<typename ItBegin, typename ItEnd>
std::string decrypt_spade(ItBegin spade_key, ItEnd spade_key_end) {
	size_t spade_key_len = spade_key_end - spade_key;
	if (spade_key_len < 3) {
		return {};
	}

	uint8_t padding_len = (spade_key[0] ^ spade_key[1] ^ spade_key[2]) - '0';
	if (spade_key_len < static_cast<size_t>(padding_len) + 2) {
		return {}; // overflow
	}
	size_t decoded_message_len = spade_key_len - padding_len - 2;
	std::vector<uint8_t> tmp_buff(&spade_key[1], &spade_key[spade_key_len - padding_len]);
	decrypt_spade_inner(tmp_buff.begin(), tmp_buff.end());

	auto skip_bytes = decode_base36(tmp_buff[0]);
	return std::string(&tmp_buff[1], &tmp_buff[1 + decoded_message_len - skip_bytes]);
}

std::string decrypt_spade_a(std::string const& spade_a) {
	auto spade = websocketpp::base64_decode(spade_a); // base64 解码
	return decrypt_spade(spade.cbegin(), spade.cend());
}

int main()
{
	// uint8_t szInput[] = { 0x90, 0xbc, 0x1e, 0xfa, 0x56, 0xbd, 0x06, 0xf6, 0x4b, 0xbf, 0x0c, 0xef, 0x71, 0xa2, 0x3d, 0xec, 0x73, 0xa7, 0x3c, 0xef, 0x42, 0x94, 0x0a, 0xe8, 0x45, 0xb8, 0x0a, 0xf1, 0x76, 0xb9, 0x08, 0xf0, 0x42, 0xb8, 0x0a, 0x83, 0x83 };
	// std::string key = decrypt_spade(szInput, szInput+sizeof(szInput));
	auto key = decrypt_spade_a("kLwe+la9BvZLvwzvcaI97HOnPO9ClAroRbgK8Xa5CPBCuAqDgw==");

	auto key_ok = key == "5011945309e6465581fd0d6971c0e002";
	std::cout << key << " -- " << (key_ok ? "OK" : "BAD") << std::endl;
}

在手机上运行这个脚本报错

Traceback (most recent call last):
File "/data/data/com.termux/files/home/export_music/main.py", line 2, in
from server import *
File "/data/data/com.termux/files/home/export_music/server/init.py", line 2, in
from server import qqmusic, kugoumusic, kugoulitemusic, wangyiyunmusic, qishuimusic, xuelang, wufanyouxiting
File "/data/data/com.termux/files/home/export_music/server/qqmusic.py", line 8, in
from utils.tc_tea import tc_tea_decrypt
ModuleNotFoundError: No module named 'utils.tc_tea'