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# TgCrypto
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<img src="https://i.imgur.com/JyxrStE.png" width="160" align="right">
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> Fast Telegram Crypto Library for Python
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**TgCrypto** is a high-performance, easy-to-install Telegram Crypto Library written in C as a Python extension.
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TgCrypto is intended for [Pyrogram](//github.com/pyrogram/pyrogram) and implements the crypto algorithms Telegram
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requires, namely **AES-IGE 256 bit** (used in MTProto v2.0) and **AES-CTR 256 bit** (used for CDN encrypted files).
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## Installation
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``` bash
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$ pip3 install --upgrade tgcrypto
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```
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More info: https://docs.pyrogram.ml/topics/tgcrypto
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## API
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TgCrypto API consists of these four methods:
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```python
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def ige256_encrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
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def ige256_decrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
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def ctr256_encrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes:
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def ctr256_decrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes:
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```
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## Usage
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### IGE Mode
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**Note**: Data must be padded to match a multiple of the block size (16 bytes).
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``` python
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import os
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import tgcrypto
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data = os.urandom(10 * 1024 * 1024 + 7) # 10 MB of random data + 7 bytes to show padding
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key = os.urandom(32) # Random Key
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iv = os.urandom(32) # Random IV
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# Pad with zeroes: -7 % 16 = 9
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data += bytes(-len(data) % 16)
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ige_encrypted = tgcrypto.ige256_encrypt(data, key, iv)
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ige_decrypted = tgcrypto.ige256_decrypt(ige_encrypted, key, iv)
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print(data == ige_decrypted) # True
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```
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### CTR Mode (single chunk)
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``` python
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import os
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import tgcrypto
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data = os.urandom(10 * 1024 * 1024) # 10 MB of random data
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key = os.urandom(32) # Random Key
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enc_iv = bytearray(os.urandom(16)) # Random IV
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dec_iv = enc_iv.copy() # Keep a copy for decryption
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ctr_encrypted = tgcrypto.ctr256_encrypt(data, key, enc_iv, bytes(1))
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ctr_decrypted = tgcrypto.ctr256_decrypt(ctr_encrypted, key, dec_iv, bytes(1))
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print(data == ctr_decrypted) # True
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```
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### CTR Mode (stream)
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``` python
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import os
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import tgcrypto
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from io import BytesIO
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data = BytesIO(os.urandom(10 * 1024 * 1024)) # 10 MB of random data
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key = os.urandom(32) # Random Key
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enc_iv = bytearray(os.urandom(16)) # Random IV
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dec_iv = enc_iv.copy() # Keep a copy for decryption
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enc_state = bytes(1) # Encryption state, starts from 0
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dec_state = bytes(1) # Decryption state, starts from 0
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encrypted_data = BytesIO() # Encrypted data buffer
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decrypted_data = BytesIO() # Decrypted data buffer
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while True:
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chunk = data.read(1024)
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if not chunk:
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break
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# Write 1K encrypted bytes into the encrypted data buffer
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encrypted_data.write(tgcrypto.ctr256_encrypt(chunk, key, enc_iv, enc_state))
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# Reset position. We need to read it now
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encrypted_data.seek(0)
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while True:
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chunk = encrypted_data.read(1024)
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if not chunk:
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break
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# Write 1K decrypted bytes into the decrypted data buffer
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decrypted_data.write(tgcrypto.ctr256_decrypt(chunk, key, dec_iv, dec_state))
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print(data.getvalue() == decrypted_data.getvalue()) # True
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```
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## License
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[LGPLv3+](COPYING.lesser) © 2017-2019 [Dan Tès](https://github.com/delivrance)
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239
README.rst
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README.rst
@ -1,239 +0,0 @@
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|header|
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Table of Contents
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=================
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- `About`_
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- `Installation`_
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- `API`_
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- `Usage`_
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- `Contribution`_
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- `Feedback`_
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- `License`_
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About
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=====
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**TgCrypto** is a high-performance, easy-to-install Telegram Crypto Library written in C as a Python extension.
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TgCrypto is intended for Pyrogram [#f1]_ and implements the crypto algorithms Telegram requires, namely
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**AES-IGE 256 bit** (used in MTProto v2.0) and **AES-CTR 256 bit** (used for CDN encrypted files).
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Installation
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============
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.. code-block:: bash
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$ pip3 install --upgrade tgcrypto
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**Note:** Being a C extension for Python, TgCrypto is an optional but *highly recommended* Pyrogram_ dependency;
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if TgCrypto is not detected in your system, Pyrogram will automatically fall back to the much slower PyAES and will
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show you a warning.
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The reason about being an optional package is that TgCrypto requires some extra system tools in order to be compiled.
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The errors you receive when trying to install TgCrypto are system dependent, but also descriptive enough to understand
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what you should do next:
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- **Windows**: Install `Visual C++ 2015 Build Tools <http://landinghub.visualstudio.com/visual-cpp-build-tools>`_.
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- **macOS**: A pop-up will automatically ask you to install the command line developer tools.
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- **Linux**: Install a proper C compiler (``gcc``, ``clang``) and the Python header files (``python3-dev``).
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- **Termux (Android)**: Install ``clang`` and ``python-dev`` packages.
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API
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===
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TgCrypto API consists of these four methods:
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.. code-block:: python
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def ige256_encrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
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.. code-block:: python
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def ige256_decrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
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.. code-block:: python
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def ctr256_encrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes:
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.. code-block:: python
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def ctr256_decrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes:
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Usage
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=====
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IGE Mode:
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---------
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**Note**: Data must be padded to match a multiple of the block size (16 bytes).
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.. code-block:: python
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import os
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import tgcrypto
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data = os.urandom(10 * 1024 * 1024 + 7) # 10 MB of random data + 7 bytes to show padding
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key = os.urandom(32) # Random Key
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iv = os.urandom(32) # Random IV
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# Pad with zeroes: -7 % 16 = 9
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data += bytes(-len(data) % 16)
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ige_encrypted = tgcrypto.ige256_encrypt(data, key, iv)
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ige_decrypted = tgcrypto.ige256_decrypt(ige_encrypted, key, iv)
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print(data == ige_decrypted) # True
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CTR Mode (single chunk):
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------------------------
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.. code-block:: python
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import os
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import tgcrypto
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data = os.urandom(10 * 1024 * 1024) # 10 MB of random data
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key = os.urandom(32) # Random Key
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enc_iv = bytearray(os.urandom(16)) # Random IV
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dec_iv = enc_iv.copy() # Keep a copy for decryption
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ctr_encrypted = tgcrypto.ctr256_encrypt(data, key, enc_iv, bytes(1))
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ctr_decrypted = tgcrypto.ctr256_decrypt(ctr_encrypted, key, dec_iv, bytes(1))
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print(data == ctr_decrypted) # True
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CTR Mode (stream):
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------------------
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.. code-block:: python
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import os
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import tgcrypto
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from io import BytesIO
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data = BytesIO(os.urandom(10 * 1024 * 1024)) # 10 MB of random data
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key = os.urandom(32) # Random Key
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enc_iv = bytearray(os.urandom(16)) # Random IV
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dec_iv = enc_iv.copy() # Keep a copy for decryption
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enc_state = bytes(1) # Encryption state, starts from 0
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dec_state = bytes(1) # Decryption state, starts from 0
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encrypted_data = BytesIO() # Encrypted data buffer
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decrypted_data = BytesIO() # Decrypted data buffer
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while True:
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chunk = data.read(1024)
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if not chunk:
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break
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# Write 1K encrypted bytes into the encrypted data buffer
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encrypted_data.write(tgcrypto.ctr256_encrypt(chunk, key, enc_iv, enc_state))
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# Reset position. We need to read it now
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encrypted_data.seek(0)
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while True:
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chunk = encrypted_data.read(1024)
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if not chunk:
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break
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# Write 1K decrypted bytes into the decrypted data buffer
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decrypted_data.write(tgcrypto.ctr256_decrypt(chunk, key, dec_iv, dec_state))
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print(data.getvalue() == decrypted_data.getvalue()) # True
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Contribution
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============
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**You are very welcome to contribute** by either submitting pull requests or
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reporting issues/bugs as well as suggesting best practices, ideas, enhancements
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on both code and documentation. Any help is appreciated!
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Feedback
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========
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Means for getting in touch:
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- `Community`_
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- `Telegram`_
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- `GitHub`_
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- `Email`_
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License
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=======
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- Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
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- Licensed under the terms of the
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`GNU Lesser General Public License v3 or later (LGPLv3+)`_
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-----
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.. [#f1] Although TgCrypto is intended for `Pyrogram`_, it is shipped as a standalone package and can thus be used for
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any other Python project too.
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.. _`Community`: https://t.me/PyrogramChat
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.. _`Telegram`: https://t.me/haskell
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.. _`GitHub`: https://github.com/pyrogram/tgcrypto/issues
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.. _`Email`: admin@pyrogram.ml
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.. _`GNU Lesser General Public License v3 or later (LGPLv3+)`: COPYING.lesser
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.. _`Pyrogram`: https://github.com/pyrogram/pyrogram
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.. |header| raw:: html
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<h1 align="center">
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<a href="https://github.com/pyrogram/tgcrypto">
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<div><img src="https://raw.githubusercontent.com/pyrogram/logos/master/logos/tgcrypto_logo2.png" alt="TgCrypto Logo"></div>
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</a>
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</h1>
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<p align="center">
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<b>Fast Telegram Crypto Library for Python</b>
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<br>
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<a href="https://pypi.python.org/pypi/TgCrypto">
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Download
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</a>
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•
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<a href="https://docs.pyrogram.ml/resources/TgCrypto">
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Documentation
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</a>
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•
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<a href="https://t.me/PyrogramChat">
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Community
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</a>
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<br><br>
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<a href="https://github.com/pyrogram/pyrogram">
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<img src="https://img.shields.io/badge/PYROGRAM-V0.8.0-eda738.svg?longCache=true&style=for-the-badge&colorA=262b30"
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alt="TgCrypto">
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</a>
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<a href="https://github.com/pyrogram/tgcrypto">
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<img src="https://img.shields.io/badge/TGCRYPTO-V1.1.1-eda738.svg?longCache=true&style=for-the-badge&colorA=262b30"
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alt="TgCrypto">
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</a>
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</p>
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.. |logo| image:: https://raw.githubusercontent.com/pyrogram/logos/master/logos/tgcrypto_logo2.png
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:target: https://github.com/pyrogram/tgcrypto
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:alt: TgCrypto
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.. |description| replace:: **Fast Telegram Crypto Library for Python**
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