Huawei Backup

[pawgol]

I cannot help much. I just modified the python script to the code provided below. To use it it is necessary to manually obtain:
pwkey_salt
e_perbackupkey
checkMsg

from backup xml file.

In example below the password is mate20pro
Usage example:
$ python3 ./test.py mate20pro
success OK b'mate20pro'

$python3 ./test.py notworkingpassword
error BAD b'notworkingpassword'

You may need to install python3 and some python libraries to run this script.
Using this script you can run through a list of previously generated passwords.
Unfortunately I wasn't able to retrieve my password yet.

Code:

#!/usr/local/opt/python3 import argparse import binascii import pdb from Crypto.Cipher import AES from Crypto.Hash import SHA256 from Crypto.Hash import HMAC from Crypto.Protocol.KDF import PBKDF2 parser = argparse.ArgumentParser() parser.add_argument('password', help='user password for the backup') args = parser.parse_args() password = args.password.encode('utf-8') #mate20pro pwkey_salt = binascii.unhexlify('efeea84ac48d147eca3a6631e56da4d6c932cf7d1765fea8defdbf1f2235c12b') e_perbackupkey = binascii.unhexlify('cbf97ca427de57e714e14c6709de190af5acd87333fb2932dfcddbe40c3b91f2de8c366dcfd5843442f6efd288e8a52e') checkMsg = binascii.unhexlify('ea5abd671a5df174e85b89dca6e69f797c3b381bc95e21d5242908c30d92517acc21e5553be3dc5a1bcc16141e229471cd600e60eaa5fdb483e85f92d1458ead') count = 5000 dklen = 32 def prf(p, s):     return HMAC.new(p, s, SHA256).digest() key_salt = pwkey_salt[:16] key = PBKDF2(password, key_salt, dklen, count, prf) nonce = pwkey_salt[16:] #pdb.set_trace() bkey = AES.new(key, AES.MODE_GCM, nonce).decrypt(e_perbackupkey)[:32] salt = checkMsg[32:] res = PBKDF2(bkey, salt, dklen, count, prf) if res==checkMsg[:32]:     print('success OK', password) else:     print('error BAD', password)