Python tool and library for decrypting and encrypting MS Office files using a password or other keys
msoffcrypto-tool is a Python tool and library for decrypting and encrypting MS Office files using a password or other keys.
pip install msoffcrypto-tool
Specify the password with -p flag:
msoffcrypto-tool encrypted.docx decrypted.docx -p Passw0rd
Password is prompted if you omit the password argument value:
$ msoffcrypto-tool encrypted.docx decrypted.docx -p
Password:
To check if the file is encrypted or not, use -t flag:
msoffcrypto-tool document.doc --test -v
It returns 1 if the file is encrypted, 0 if not.
[!IMPORTANT] Encryption feature is experimental. Please use it at your own risk.
To password-protect a document, use -e flag along with -p flag:
msoffcrypto-tool -e -p Passw0rd plain.docx encrypted.docx
Password and more key types are supported with library functions.
Basic usage:
import msoffcrypto
encrypted = open("encrypted.docx", "rb")
file = msoffcrypto.OfficeFile(encrypted)
file.load_key(password="Passw0rd") # Use password
with open("decrypted.docx", "wb") as f:
file.decrypt(f)
encrypted.close()
In-memory:
import msoffcrypto
import io
import pandas as pd
decrypted = io.BytesIO()
with open("encrypted.xlsx", "rb") as f:
file = msoffcrypto.OfficeFile(f)
file.load_key(password="Passw0rd") # Use password
file.decrypt(decrypted)
df = pd.read_excel(decrypted)
print(df)
Advanced usage:
# Verify password before decryption (default: False)
# The ECMA-376 Agile/Standard crypto system allows one to know whether the supplied password is correct before actually decrypting the file
# Currently, the verify_password option is only meaningful for ECMA-376 Agile/Standard Encryption
file.load_key(password="Passw0rd", verify_password=True)
# Use private key
file.load_key(private_key=open("priv.pem", "rb"))
# Use intermediate key (secretKey)
file.load_key(secret_key=binascii.unhexlify("AE8C36E68B4BB9EA46E5544A5FDB6693875B2FDE1507CBC65C8BCF99E25C2562"))
# Check the HMAC of the data payload before decryption (default: False)
# Currently, the verify_integrity option is only meaningful for ECMA-376 Agile Encryption
file.decrypt(open("decrypted.docx", "wb"), verify_integrity=True)
Supported key types are
See also "Backdooring MS Office documents with secret master keys" for more information on the key types.
[!IMPORTANT] Encryption feature is experimental. Please use it at your own risk.
Basic usage:
from msoffcrypto.format.ooxml import OOXMLFile
plain = open("plain.docx", "rb")
file = OOXMLFile(plain)
with open("encrypted.docx", "wb") as f:
file.encrypt("Passw0rd", f)
plain.close()
In-memory:
from msoffcrypto.format.ooxml import OOXMLFile
import io
encrypted = io.BytesIO()
with open("plain.xlsx", "rb") as f:
file = OOXMLFile(f)
file.encrypt("Passw0rd", encrypted)
# Do stuff with encrypted buffer; it contains an OLE container with an encrypted stream
...
PRs are welcome!
poetry install
poetry run coverage run -m pytest -v
ctypes.StructureFAQs
Python tool and library for decrypting and encrypting MS Office files using a password or other keys
We found that msoffcrypto-tool demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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