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fuck_ncm.py
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import binascii
import struct
import base64
import json
import os
from Crypto.Cipher import AES
import requests
import eyed3
import warnings
# 下载网页图片
def download_pic(url, save_fn):
headers = {
'User-Agent': "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) "
"Chrome/100.0.4896.127 Safari/537.36 "
}
response = requests.get(url=url, headers=headers)
with open(save_fn, 'wb') as f:
f.write(response.content)
# 给mp3文件添加封面
def add_cover_2_mp3(mp3_fp, pic_fp):
audio_file = eyed3.load(mp3_fp)
if audio_file.tag is None:
audio_file.initTag()
audio_file.tag.images.set(3, open(pic_fp, 'rb').read(), 'image/jpeg')
audio_file.tag.save()
def dump(file_path):
#十六进制转字符串
core_key = binascii.a2b_hex("687A4852416D736F356B496E62617857")
meta_key = binascii.a2b_hex("2331346C6A6B5F215C5D2630553C2728")
unpad = lambda s: s[0:-(s[-1] if type(s[-1]) == int else ord(s[-1]))]
f = open(file_path, 'rb')
header = f.read(8)
#字符串转十六进制
assert binascii.b2a_hex(header) == b'4354454e4644414d'
f.seek(2,1)
key_length = f.read(4)
key_length = struct.unpack('<I', bytes(key_length))[0]
key_data = f.read(key_length)
key_data_array = bytearray(key_data)
for i in range(0, len(key_data_array)):
key_data_array[i] ^= 0x64
key_data = bytes(key_data_array)
cryptor = AES.new(core_key, AES.MODE_ECB)
key_data = unpad(cryptor.decrypt(key_data))[17:]
key_length = len(key_data)
key_data = bytearray(key_data)
key_box = bytearray(range(256))
c = 0
last_byte = 0
key_offset = 0
for i in range(256):
swap = key_box[i]
c = (swap + last_byte + key_data[key_offset]) & 0xff
key_offset += 1
if key_offset >= key_length:
key_offset = 0
key_box[i] = key_box[c]
key_box[c] = swap
last_byte = c
meta_length = f.read(4)
meta_length = struct.unpack('<I', bytes(meta_length))[0]
meta_data = f.read(meta_length)
meta_data_array = bytearray(meta_data)
for i in range(0, len(meta_data_array)):
meta_data_array[i] ^= 0x63
meta_data = bytes(meta_data_array)
meta_data = base64.b64decode(meta_data[22:])
cryptor = AES.new(meta_key, AES.MODE_ECB)
meta_data = unpad(cryptor.decrypt(meta_data)).decode('utf-8')[6:]
meta_data = json.loads(meta_data)
# 专辑封面地址
cover_url = meta_data['albumPic']
crc32 = f.read(4)
crc32 = struct.unpack('<I', bytes(crc32))[0]
f.seek(5, 1)
image_size = f.read(4)
image_size = struct.unpack('<I', bytes(image_size))[0]
image_data = f.read(image_size)
file_name = f.name.split("/")[-1].split(".ncm")[0] + '.' + meta_data['format']
m = open(os.path.join(os.path.split(file_path)[0], file_name), 'wb')
chunk = bytearray()
while True:
chunk = bytearray(f.read(0x8000))
chunk_length = len(chunk)
if not chunk:
break
for i in range(1, chunk_length+1):
j = i & 0xff
chunk[i-1] ^= key_box[(key_box[j] + key_box[(key_box[j] + j) & 0xff]) & 0xff]
m.write(chunk)
m.close()
f.close()
# 添加封面
if cover_url[-3:] != "jpg":
warnings.warn(f"图片不是jpg格式，不支持添加封面: {cover_url}")
else:
download_pic(cover_url, "./temp.jpg")
add_cover_2_mp3(file_name, "./temp.jpg")
os.remove("./temp.jpg")
return file_name
if __name__ == '__main__':
# 将目录中的ncm文件转成mp3
def crack_ncm_file(path):
for file in os.listdir(path):
file_path = os.path.join(path, file)
if file[-3:] == 'ncm':
dump(file_path)
os.remove(file_path)
print(file_path, " 转换成功")
import argparse
parser = argparse.ArgumentParser(description="nothing")
parser.add_argument('-p', action='store')
args = parser.parse_args()
crack_ncm_file(args.p)
# path = r"D:\chord_analyzer\songs\田中秀和"
#
# crack_ncm_file(path)