A tool to decrypt mega encrypted link, inspired from https://github.com/denysvitali/megadecrypter/ because installing Crystal-lang is not an easy thing for most people.

megadecrypter.py

#!/usr/bin/env python
# Copyright 2018 Hung-Te Lin. All rights reserved.
# Use of this source code is governed by MIT license.
"""A program to decrypt mega://enc2?.... link.

Inspired from https://github.com/denysvitali/megadecrypter
"""

import base64
import binascii
import re
import subprocess
import sys


class MegaLinkCrypto(object):

    enc_xor = [12, 57, 251, 120, 18, 75, 6, 250, 85]
    pwd2 = [110, 89, 114, 88, 97, 64, 57, 81, 63, 49, 38, 104, 67, 87, 77, 92,
            57, 40, 55, 51, 49, 66, 112, 63, 116, 52, 50, 61, 33, 107, 51, 46]
    iv = [121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62]

    def __init__(self):
        pass

    def getBytes(self):
        byteDecKey = self.pwd2[:]
        for i in xrange(160):
            byteDecKey[i % 32] = byteDecKey[i % 32] ^ self.enc_xor[i % 9]
        return byteDecKey

    @staticmethod
    def hexlify(value):
        return ''.join('%02x' % d for d in value)

    def decrypt(self, value):
        cipher = ''.join(self.toBase64(value).splitlines())
        key = self.hexlify(self.getBytes())
        iv = self.hexlify(self.iv)
        command = ('echo "%s" | openssl aes-256-cbc -d -iv %s -K %s -a -A' %
                   (cipher, iv, key))
        plaintext = subprocess.check_output(command, shell=True)
        return plaintext.replace('+', '-').replace('/', '_').replace('=', '')

    def toBase64(self, value):
        return (value.replace('-', '+').replace('_', '/').replace( ',', '') +
                '==')

    def decryptLink(self, link):
        """Decrypts a mega://enc2?XXXXX link to HTTP URL."""
        r = re.match(r'^mega://(f|)enc2\?(.*)$', link)
        if not r:
            raise RuntimeError('Incorrect link (need mega://enc2...)')
        folder, data = r.groups()
        mega_link = self.decrypt(data)
        if '!' not in mega_link:
            raise RuntimeError('Invalid mega encryped link.')
        return 'https://mega.nz/#%s%s' % ('F' if folder else '', mega_link)


def main():
    if len(sys.argv) != 2:
        exit('Usage: %s mega://enc2?.....' % sys.argv[0])

    try:
        c = MegaLinkCrypto()
        print(c.decryptLink(sys.argv[1]))
    except Exception as e:
        print('ERROR: %s' % e)
        exit(1)


if __name__ == '__main__':
    main()

how to use tho