Recover partially forgotten password for Truecrypt/Veracrypt container

veracrypt_find_by_mask.py

"""
The MIT License (MIT)
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in the Software without restriction, including without limitation the rights
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furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
"""

import subprocess

container_file = "C:\\container.hc"
executable = "C:\\Program Files\\VeraCrypt\\VeraCrypt.exe"

print("I'm running on %s" % container_file)

# password: test. Or dest, est, desd, tesd? Not sure, too many to try each one manually.
pattern = [['d', 't', ''], ['es'], ['t', 'd']]


def recurse(pattern_index, password):
    if pattern_index == len(pattern):
        print("Trying password: %s" % password)
        # using the default and known hash (sha-512) to speed it up dramatically
        command = "%s /hash sha-512 /q /v %s /l p /a /p %s /s /m ro" % (executable, container_file, password)

        process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        return_code = process.wait() # wait until the decrypting has finished trying current password
        (stdout, stderr) = process.communicate()

        if stderr:
            print("Error: '%s'" % stderr)
            return False

        if return_code == 0:
            print("Password found: %s" % password)
            return True
    else:
        for i in range(len(pattern[pattern_index])):
            if recurse(pattern_index + 1, password + pattern[pattern_index][i]):
                return True
        return False
    return False


recurse(0, '')