simpleaes256cli 1.0.1

Minimal AES-256-GCM file encryption CLI — encrypt/decrypt files with a password
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# aes256

Minimal AES-256-GCM file encryption CLI written in Rust.

Encrypts or decrypts a single file with a password. The original file is deleted after the operation succeeds.

## Install

```sh
cargo install aes256
```

Or build from source:

```sh
cargo build --release
# binary: target/release/simpleaes256-rs
```

## Usage

```
simpleaes256-rs -e <file>    encrypt a file
simpleaes256-rs -d <file>    decrypt a file
```

**Encrypt**

```sh
simpleaes256-rs -e secret.txt
# prompts for password (twice)
# writes  secret.txt.enc
# deletes secret.txt
```

**Decrypt**

```sh
simpleaes256-rs -d secret.txt.enc
# prompts for password
# writes  secret.txt   (strips .enc suffix)
# deletes secret.txt.enc
```

If the input file does not end in `.enc`, the output is written as `<file>.dec`.

## File format

```
[0..4]   magic  "AE56"
[4..20]  salt   16 bytes  (Argon2id input)
[20..32] nonce  12 bytes  (AES-GCM nonce)
[32..]   ciphertext + 16-byte GCM authentication tag
```

## Cryptography

| Primitive | Algorithm |
|-----------|-----------|
| Key derivation | Argon2id (default parameters) |
| Encryption | AES-256-GCM |
| Nonce/salt generation | OS CSPRNG (`OsRng`) |

## Dependencies

| Crate | Role |
|-------|------|
| [`aes-gcm`](https://crates.io/crates/aes-gcm) | AES-256-GCM encrypt / decrypt |
| [`argon2`](https://crates.io/crates/argon2) | Password-based key derivation |
| [`rand`](https://crates.io/crates/rand) | Cryptographically secure random bytes |
| [`rpassword`](https://crates.io/crates/rpassword) | Hidden password prompt |

## License

MIT