轉載

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# 依賴pycrypto庫 import binascii import struct import base64 import json import os from Crypto.Cipher import AES def dump(file_path):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)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] ^= 0x64key_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 = 0last_byte = 0key_offset = 0for i in range(256):swap = key_box[i]c = (swap + last_byte + key_data[key_offset]) & 0xffkey_offset += 1if key_offset >= key_length: key_offset = 0key_box[i] = key_box[c]key_box[c] = swaplast_byte = cmeta_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] ^= 0x63meta_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)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 = meta_data['musicName'] + '.' + 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:breakfor 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() if __name__ == '__main__':import sysif len(sys.argv) > 1:for file_path in sys.argv[1:]:try:dump(file_path)except:passelse:print("Usage: python ncmdump.py \"File Name\"")

如果導包出錯?ModuleNotFoundError:No module named "Crypto"

參考?導包出錯

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