https://github.com/kevincharm/feistel_shuffle_fe

https://github.com/kevincharm/feistel_shuffle_fe

Last synced: about 4 hours ago
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• Host: GitHub
• URL: https://github.com/kevincharm/feistel_shuffle_fe
• Owner: kevincharm
• License: mit
• Created: 2023-08-13T02:09:05.000Z (about 1 year ago)
• Default Branch: master
• Last Pushed: 2023-08-13T02:10:03.000Z (about 1 year ago)
• Last Synced: 2024-04-14T13:46:01.219Z (7 months ago)
• Language: Makefile
• Size: 2.93 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Feistel Shuffle (Fe Edition)

Generalised Feistel cipher (format-preserving encryption) implemented in [Fe](https://fe-lang.org).

JS Spec: https://github.com/kevincharm/gfc-fpe

## Usage

```fe

use feistel_shuffle::encrypt

// Shuffle an NFT token id `x`

let x: u256 = 0

let domain: u256 = 10_000

let random_seed: u256 = 0xc7a5d737993796fccf3e283c501bbe000e61d1129dbf31a712d75d1de219ce47

let rounds: u256 = 6

let x_prime: u256 = 1 + encrypt(x - 1, domain, random_seed, rounds)

```