Private Key Sharing System

A secure implementation of Shamir's Secret Sharing scheme for splitting and managing private keys. This system allows splitting a private key into multiple shares, where a subset of shares is required to reconstruct the original key.

Features

• Split private keys into multiple shares (3 shares by default)
• Reconstruct private keys using a threshold of shares (2 shares minimum)
• Generate new compatible shares from existing ones
• Cryptographic integrity protection for shares
• Version control for share compatibility
• Share types: Device, Server, and Recovery shares
• Secure random number generation
• Galois Field (GF256) arithmetic for mathematical operations

Installation

Clone the repository
git clone https://github.com/yourusername/private-key-split.git
cd private-key-split

Install dependencies

npm install

Environment Variables

PRIVATE_KEY=your_solana_private_key_here

API Reference

KeyManager

splitKey(privateKey, totalShares, threshold)

Splits a private key into multiple shares.

• privateKey: String - The private key to split
• totalShares: Number - Total number of shares to create
• threshold: Number - Minimum shares needed to reconstruct
• Returns: Array of share objects

combineShares(shares)

Reconstructs the private key from shares.

• shares: Array - Array of share objects
• Returns: String - The reconstructed private key

generateNewShareFromTwo(share1, share2)

Generates a new compatible share from two existing shares.

• share1: Object - First share
• share2: Object - Second share
• Returns: Object - A new compatible share