TgCryptoRust

[!NOTE] This project is provided for educational and experimental purposes. The implementation follows public AES specifications and is tested against known vectors, but it has not received a formal third-party security audit. Do not treat it as a certified cryptographic module.

Rust-powered, AES-NI accelerated cryptography for Telegram clients.

License Python Rust

TgCryptoRust is a drop-in replacement for TgCrypto, implemented in Rust and packaged for Python through PyO3 and Maturin. It implements the cryptographic algorithms Telegram requires, namely:

AES-256-IGE — used in MTProto v2.0.
AES-256-CTR — used for CDN encrypted files.
AES-256-CBC — used for encrypted passport credentials.

Requirements

Python 3.9 through 3.14
Rust 1.86+ (only when building from source)

Prebuilt wheels are available for common desktop and server platforms. Rust is only required when a wheel is not available for your platform.

Installation

pip install TgCryptoRust

Or with uv:

uv add TgCryptoRust
uv sync

API

def ige256_encrypt(data: bytes, key: bytes, iv: bytes) -> bytes: ...
def ige256_decrypt(data: bytes, key: bytes, iv: bytes) -> bytes: ...

def ctr256_encrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes: ...
def ctr256_decrypt(data: bytes, key: bytes, iv: bytes, state: bytes) -> bytes: ...

def cbc256_encrypt(data: bytes, key: bytes, iv: bytes) -> bytes: ...
def cbc256_decrypt(data: bytes, key: bytes, iv: bytes) -> bytes: ...

Usage

IGE Mode

Note: Data must be padded to a multiple of the block size (16 bytes).

import os
import tgcrypto

data = os.urandom(1024)
key = os.urandom(32)
iv = os.urandom(32)

encrypted = tgcrypto.ige256_encrypt(data, key, iv)
decrypted = tgcrypto.ige256_decrypt(encrypted, key, iv)

assert decrypted == data

CTR Mode

CTR accepts arbitrary-length data. The state argument is a one-byte offset inside the current keystream block, kept for TgCrypto compatibility.

import os
import tgcryptors

data = os.urandom(1000)
key = os.urandom(32)
iv = os.urandom(16)
state = b"\x00"

encrypted = tgcryptors.ctr256_encrypt(data, key, iv, state)
decrypted = tgcryptors.ctr256_decrypt(encrypted, key, iv, state)

assert decrypted == data

CBC Mode

Note: Data must be padded to a multiple of the block size (16 bytes).

import os
import tgcrypto

data = os.urandom(1024)
key = os.urandom(32)
iv = os.urandom(16)

encrypted = tgcrypto.cbc256_encrypt(data, key, iv)
decrypted = tgcrypto.cbc256_decrypt(encrypted, key, iv)

assert decrypted == data

Streaming API

Use the streaming classes when processing one logical stream in chunks. The key schedule is expanded once and reused.

import os
import tgcryptors

key = os.urandom(32)
iv = os.urandom(16)
data = os.urandom(1024)

stream = tgcryptors.Ctr256(key, iv)
encrypted = stream.update(data[:300]) + stream.update(data[300:])

IGE streaming is also available for block-aligned chunks:

import os
import tgcrypto

key = os.urandom(32)
iv = os.urandom(32)
data = os.urandom(1024)

stream = tgcrypto.Ige256(key, iv)
encrypted = stream.encrypt(data[:512]) + stream.encrypt(data[512:])

Runtime Metadata

import tgcryptors

print(tgcryptors.__version__)
print(tgcryptors.runtime_info())

Imports

Existing TgCrypto users can keep importing tgcrypto:

import tgcrypto

New code can import the branded module directly:

import tgcryptors

Both modules expose the same API.

Compatibility

TgCryptoRust is a full drop-in replacement. All function names, argument orders, return types, and validation behavior match the original TgCrypto:

Function	Arguments
`ige256_encrypt`	`(data, key, iv)`
`ige256_decrypt`	`(data, key, iv)`
`ctr256_encrypt`	`(data, key, iv, state)`
`ctr256_decrypt`	`(data, key, iv, state)`
`cbc256_encrypt`	`(data, key, iv)`
`cbc256_decrypt`	`(data, key, iv)`

Architecture

tgcryptors-core — Rust AES primitive and Telegram block modes (IGE, CTR, CBC).
tgcryptors-python — PyO3 extension module exposing the native API.
python/tgcrypto — Compatibility shim re-exporting tgcryptors for existing imports.
tests/ — Python unit tests covering the public API.

On x86 and x86_64, AES-NI is detected at runtime when the crate is built with the default aesni feature. Other targets use a software fallback (T-table based, not guaranteed constant-time on every CPU).

Expanded key material is zeroized on drop using the zeroize crate, which guarantees the compiler will not optimize away the clearing.

Migrating From TgrCrypto

TgrCrypto is deprecated in favor of TgCryptoRust.

pip uninstall TgrCrypto
pip install TgCryptoRust

Existing code that imports tgcrypto can remain unchanged.

Development

# Set up environment
uv sync --python 3.14

# Build and install the native module
uv run maturin develop --release

# Run Python tests
.venv/bin/python -m unittest discover -s tests -v

Run the Rust checks:

cargo fmt --all -- --check
cargo clippy --all-targets --all-features -- -D warnings
cargo test --release

Build a wheel:

uv build --wheel

Changelog

1.3.0

Bumped MSRV from Rust 1.83 to 1.86.
Replaced manual key zeroization with the zeroize crate for guaranteed compiler-resistant memory clearing.
Removed deprecated generate-import-lib feature (no-op since PyO3 0.29).
Added CI job to verify MSRV compliance.
Fixed clippy warnings and imprecise documentation comments.
Changed license from LGPLv3+ to MIT.

License

MIT — 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.

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TgCryptoRust 1.3.0

TgCryptoRust

Requirements

Installation

API

Usage

IGE Mode

CTR Mode

CBC Mode

Streaming API

Runtime Metadata

Imports

Compatibility

Architecture

Migrating From TgrCrypto

Development

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1.3.0

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1 maintainer

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MD5	`f564d15923819896008d53922c7aaaeb`
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MD5	`a050d35e0c33c43e365c7fc5e9c66203`
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Algorithm	Hash digest
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BLAKE2b-256	`2d8ab6d510b39d2b8725aefb9d94cbfbcd2e57c90f93998fe8d29eb0a1a7cc02`

Algorithm	Hash digest
SHA256	`8233cab25adb8d20d1422eb6c688cc38a89d982e608700784cf7dfc1c4553f7a`
MD5	`86abf8eda3775bdf185a79c251c5e93d`
BLAKE2b-256	`f2109aae55e249592e48e0b25c4260e4fab3abfae03f8a3e4a4d176f920dafb1`

Algorithm	Hash digest
SHA256	`9c4ccb4c9aafaa37a46933c724f119010717fe95d8728b4946319c943b6f689e`
MD5	`ff05e026c5dfa1ef8479227c2e57efaf`
BLAKE2b-256	`b398a9f89e48d42ddc556a3bbca5a7987f417450f20dfc7127c6c83eae10079c`

Algorithm	Hash digest
SHA256	`2b2495f1cc92c5127984de8c83ac23def6f7137190723e9e975c693d3fc8adb5`
MD5	`4afdd2a54e39271f2534edee3e21f2f0`
BLAKE2b-256	`f8267f6e9b1ff384dcb9bf9626a45b1d1befb297116a413e7dfd53e8fe813adc`