https://github.com/hackergrrl/rfc-8439

Common Lisp implementation of RFC 8439: ChaCha20 and Poly1305 for IETF Protocols.
https://github.com/hackergrrl/rfc-8439

Last synced: 1 day ago
JSON representation

Common Lisp implementation of RFC 8439: ChaCha20 and Poly1305 for IETF Protocols.

• Host: GitHub
• URL: https://github.com/hackergrrl/rfc-8439
• Owner: hackergrrl
• License: agpl-3.0
• Created: 2024-03-05T03:55:14.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2024-03-10T00:33:00.000Z (7 months ago)
• Last Synced: 2024-05-13T16:25:55.701Z (5 months ago)
• Language: Common Lisp
• Size: 22.5 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# rfc-8439

This is a working implementation of [RFC 8439: ChaCha20 and Poly1305 for IETF

Protocols](https://datatracker.ietf.org/doc/html/rfc8439), written in Common

Lisp. It passes the primary test vectors given in the RFC document.

The main functions mimick the RFC's pseudocode:

```

;; (aad: u8[], key: u8[32], iv: u8[8], constant: u8[4], plaintext: u8[]) => u8[], u8[16]

(chacha20-aead-encrypt aad key iv constant plaintext)

```

and

```

;; (aad: u8[], key: u8[32], iv: u8[8], constant: u8[4], ciphertext: u8[]) => u8[], u8[16]

(chacha20-aead-decrypt aad key iv constant ciphertext)

```

`iv` and `constant` get concatenated, forming a 96-bit nonce. The typical way

to use this cipher is to set said nonce to `1` and increase by `1` after each

message encrypted. A counter value MUST NOT ever be reused with the same key.

# Disclaimer

This was a fun little educational project, and hasn't been audited. Please

don't use it for real software that affects people's lives. It also hasn't been

optimized for speed.

# License

AGPL-3.0