Initial commit

Author: 5x

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Type '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Windows 10]
+ - Python/Tk Version
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/

LICENSE

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+MIT License
+
+Copyright (c) 2019 5x
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+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
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# cryptography-gui-app
+
+An application for encrypting/decrypting text with few symmetric/asymmetric crypto algorithms.
+
+Features:
+- Multi alphabet crypt support (English, Ukraine, Russian);
+- Symmetric/Asymmetric mode;
+- Decrypt brute force iterator;
+- Native Tk GUI.
+
+Ciphers:
+- Caesar cipher;
+- Trithemius cipher (Linear equation/Not linear equation/ slogan);
+- Gamma cipher (PRNG based);
+- DES (mode CFB);
+- Asymmetric cipher (public/private key realization).
+
+## Build Windows Application 
+
+To create runnable execute application use next:
+```bash
+pyinstaller --onefile --windowed --name cryptography-gui-app app.py
+```
+[More info about PyInstaller](https://www.pyinstaller.org/)
+
+## Requirements
+
+* Python 3.4 or later
+* pycryptodome
+* pyinstaller
+
+## Application screenshots
+![Application screenshot](assets/screenshots.png)
+
+## Support & Contributing
+Anyone is welcome to contribute. If you decide to get involved, please take a moment and check out the following:
+
+* [Bug reports](.github/ISSUE_TEMPLATE/bug_report.md)
+* [Feature requests](.github/ISSUE_TEMPLATE/feature_request.md)
+
+## License
+
+The code is available under the [MIT license](LICENSE).

__init__.py

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+#!/usr/bin/python3,4
+# -*- coding: utf-8 -*-
+"""cryptography-gui-app"""

app.py

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+from gui import MainWindow
+
+if __name__ == "__main__":
+    main = MainWindow()
+    main.mainloop()

assets/screenshots.png

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+from .caesar_cipher import CaesarCipher
+from .decrypt_iter import DecryptIter
+from .trithemius_cipher import TrithemiusCipher, TrithemiusLinearEquation,\
+    TrithemiusAssocReplace, LinearEquationException
+from .gamma_cipher import GammaCipher
+from .des_cipher import DESCipher
+from .asymmetric import AsymmetricCipher
+
+
+__all__ = [
+    "CaesarCipher",
+    "DecryptIter",
+    "TrithemiusCipher",
+    "TrithemiusLinearEquation",
+    "TrithemiusAssocReplace",
+    "LinearEquationException",
+    "GammaCipher",
+    "DESCipher",
+    "AsymmetricCipher",
+]

crypt/__init__.py

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+from string import ascii_lowercase, ascii_uppercase, digits, punctuation
+
+whitespace = " \t"
+EN = (ascii_lowercase, ascii_uppercase, digits, punctuation, whitespace)
+RU = ("АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ", "абвгдеёжзийклмнопрстуфхцчшщъыьэюя", digits, punctuation, whitespace)
+UA = ("АБВГҐДЕЄЖЗИІЇЙКЛМНОПРСТУФХЦЧШЩЬЭЮЯ", "абвгґдеєжзиіїйклмнопрстуфхцчшщьэюя", digits, punctuation, whitespace)
+
+
+def get_alphabet(lang=None):
+    alphabets = {
+        "EN": EN,
+        "RU": RU,
+        "UA": UA
+    }
+
+    return alphabets.get(lang, EN)

crypt/alphabet.py

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+from crypt.utils.number_theory_algs import extended_gcd
+from crypt.utils.bitstr import str_to_bits, bits_to_str, positive_align_str
+from crypt.utils.knapsack import knapsack
+
+
+class AsymmetricCipher(object):
+    def encrypt(self, plain_text, public_seq):
+        block_size = len(public_seq)
+        text = str_to_bits(plain_text)
+        text = positive_align_str(text, block_size)
+
+        blocks = tuple(zip(*[iter(text)] * block_size))
+
+        crt_values = []
+        for index, block in enumerate(blocks):
+            total_weight = self._block_total_weight(block, public_seq)
+            crt_values.append(total_weight)
+
+        return crt_values
+
+    def decrypt(self, cipher_text, private_seq, m, t):
+        _, _, neg_t = extended_gcd(m, t)
+
+        plain_bits = []
+        for num in cipher_text:
+            value = (neg_t * num) % m
+            bits_block = knapsack(private_seq, value)
+            plain_bits.append(bits_block)
+
+        plain_text = bits_to_str(plain_bits)
+
+        return plain_text
+
+    @staticmethod
+    def gen_public_key(secret_sec, t, m):
+        return [(t * i) % m for i in secret_sec]
+
+    def _block_total_weight(self, bits, weight_values):
+        return sum(w for w, bit in zip(weight_values, bits) if bit == "1")
+
+
+if __name__ == "__main__":
+    test_data = """The quick brown fox jumps over the lazy dog."""
+    secret_key = [1, 3, 5, 11, 21, 44, 87, 175, 349, 701]
+    s = 1590
+    m = 43
+
+    cipher = AsymmetricCipher()
+
+    # eq [43, 129, 215, 473, 903, 302, 561, 1165, 697, 1523]
+    public_key = AsymmetricCipher.gen_public_key(secret_key, m, s)
+    crt_text = cipher.encrypt(test_data, public_key)
+    plain_text = cipher.decrypt(crt_text, secret_key, s, m)
+
+    print(public_key)
+    print(crt_text)
+    print(plain_text)

crypt/asymmetric.py

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+from crypt.alphabet import get_alphabet
+from crypt.cipher_abc import CipherABC
+
+
+class CaesarCipher(CipherABC):
+    def __init__(self, key, alphabet='EN'):
+        super().__init__(key)
+        self.symbols_collection = get_alphabet(alphabet)
+
+    @CipherABC.key.setter
+    def key(self, value):
+        self._key = int(value)
+
+    def encrypt(self, plain_text):
+        return self._shift_msg(self._key, plain_text)
+
+    def decrypt(self, cipher_text):
+        return self._shift_msg(-self._key, cipher_text)
+
+    def _shift_msg(self, key, message):
+        shift_map = self._shift_map(key)
+        shifted_msg = (shift_map.get(char, char) for char in message)
+
+        return "".join(shifted_msg)
+
+    def _shift_map(self, shift):
+        assoc_map = {}
+
+        for symbols in self.symbols_collection:
+            symbols_len = len(symbols)
+
+            if symbols_len == 0:
+                continue
+
+            for j in range(symbols_len):
+                in_char = symbols[j]
+                shifted = (j + shift) % symbols_len
+                assoc_map[in_char] = symbols[shifted]
+
+        return assoc_map
+
+
+if __name__ == "__main__":
+    cipher = CaesarCipher("4")
+    crt_text = cipher.encrypt("the quick brown fox jumps over the lazy dog.")
+    plain_text = cipher.decrypt(crt_text)
+
+    print(crt_text)
+    print(plain_text)