deemru/shamir255

Splits sensitive data by Shamir's secret sharing

2.0.1 2025-12-28 22:14 UTC

Requires

• php: >=5.6

MIT

• Dmitrii Pichulin

• security
• split
• private
• key
• share
• shamir
• sensitive
• gf256

README

Shamir255 implements Shamir's Secret Sharing algorithm over GF(256).

• Pure PHP implementation (no extensions required)
• Share size equals secret size (efficient storage)
• Supports secrets of any length
• Up to 255 shares with threshold from 2 to 255

Usage

$sensitive = 'Hello, world!';
$needed = 2;
$total = 3;
$shares = Shamir255::share( $sensitive, $needed, $total );
assert( $sensitive === Shamir255::recover( [ 1 => $shares[1], 2 => $shares[2] ] ) );

Requirements

• PHP >= 5.6

Installation

composer require deemru/shamir255