# TETRA_CRYPTO

Implementation of TEA-1 and TEA-3 in rust.  
Based on "Observations on TETRA Encryption Algorithm TEA-3", "ETSI TS 104 053-1, TETRA Air Interface Security, Algorithms Specifications" and [Midnight Blue's C code](https://github.com/MidnightBlueLabs/TETRA_crypto)

## tests and build

```bash
cargo test
cargo build --release
```

## commands

| Command          | Description                                              |
|------------------|----------------------------------------------------------|
| lfsr             | Test the LFSR                                            |
| tea1             | Test TEA-1 attack                                        |
| tea3             | Test TEA-3 keystream and encryption/decryption           |
| periods          | Test for periods in TEA-3 register h                     |
| greatest-period  | Search for greatest period in TEA-3 register h           |