Kapak Save

Kapak is a simple-to-use file encryption script/library.
It uses AES_256_CBC as its encryption cipher.

If you are wondering what kapak means, it means mold.

• Installation
• CLI Usage
  • Encrypt file
  • Encrypt stdin
  • Password file
• Integration
  • Encrypt file
  • Encrypt stdin
  • Encrypt anything

Installation

Installing with pip:

pip install kapak

CLI Usage

kapak [global options] [command] [command options] [input]
kapak [encrypt | e] [options] [input]
kapak [decrypt | d] [options] [input]

Encrypt file

$ kapak encrypt -o ./image.jpg.kpk ./image.jpg
Enter password:
Confirm password:
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$ kapak decrypt -o ./image.jpg ./image.jpg.kpk
Enter password:
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Encrypt stdin

$ echo 'secret stuff' | kapak encrypt | base64
Enter password:
Confirm password:
AAAAbWth...t/ILJW/v

$ echo 'AAAAbWth...t/ILJW/v' | base64 --decode | kapak decrypt
Enter password:
secret stuff

$ cat ./text.txt | kapak encrypt -b 1024 > ./text.txt.kpk
Enter password:
Confirm password:

$ kapak decrypt -b 1024 ./text.txt.kpk > ./text.txt
Enter password:

Password file

$ echo 'P@ssw0rd' > ./password.txt
$ kapak encrypt -p ./password.txt -o ./image.jpg.kpk ./image.jpg
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$ kapak decrypt -p ./password.txt -o ./image.jpg ./image.jpg.kpk
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Integration

Encrypt file

from pathlib import Path
from kapak.aes import encrypt

input_file = Path("image.jpg")
output_file = Path("image.jpg.kpk")

with input_file.open("rb") as src, output_file.open("wb") as dst:
    total_len = input_file.stat().st_size
    progress = 0
    for chunk_len in encrypt(src, dst, "P@ssw0rd"):
        progress += chunk_len
        print(f"{progress}/{total_len}")

kapak.aes.encrypt is a generator. It yields the length of encrypted data on every iteration.

from pathlib import Path
from itertools import accumulate
from kapak.aes import decrypt

input_file = Path("image.jpg.kpk")
output_file = Path("image.jpg")

with input_file.open("rb") as src, output_file.open("wb") as dst:
    total_len = input_file.stat().st_size
    for progress in accumulate(decrypt(src, dst, "P@ssw0rd")):
        print(f"{progress}/{total_len}")

kapak.aes.decrypt is a generator. It yields the length of decrypted data on every iteration.

Encrypt stdin

import sys
from io import BytesIO
from kapak.aes import encrypt

with BytesIO() as dst:
    for _ in encrypt(
        src=sys.stdin.buffer,
        dst=dst,
        password="P@ssw0rd",
        buffer_size=1024
    ):
        pass
    encrypted_data = dst.getvalue()
    print(encrypted_data.hex())

Encrypt anything

from io import BytesIO
from kapak.aes import encrypt

anything = b"anything"

with BytesIO(anything) as src, BytesIO() as dst:
    for _ in encrypt(
        src=src,
        dst=dst,
        password="P@ssw0rd",
        buffer_size=1024
    ):
        pass
    encrypted_data = dst.getvalue()
    print(encrypted_data.hex())