RC5 in Rust

RC5 is a symmetric-key block-cipher designed by Ron Rivest in 1994.
It is notable for being simple and fast (it uses only primitive operations such as XOR and data-dependent rotations) and for its small memory footprint. Those properties make Rust an ideal language in which to implement it.

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Building the library & CLI

# build an optimized release binary
$ cargo build --release

The CLI lives in src/bin/rc5-cbc.rs and is built automatically as the rc5-cbc binary.

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Usage

Encrypt

# replace <PLAINTEXT> with any file you want to protect
$ cargo run --release --bin rc5-cbc -- --input <PLAINTEXT> --output ciphertext.rc5 encrypt
Passphrase: ********

Decrypt

$ cargo run --release --bin rc5-cbc -- --input ciphertext.rc5 --output <DECRYPTED_OUT> decrypt
Passphrase: ********

Running tests & lints

# unit + integration + property tests
$ cargo test

# static analysis
$ cargo clippy --all-targets --all-features

All tests should pass and Clippy should emit no warnings.

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License

This project is licensed under the MIT License – see LICENSE for details.