README

Information

This library is a fork of Matyas Danter's ECC library. All credit goes to him and previous contributors. This fork is a drop in replacement that contains support for Schnorr signing and verifying.

For more information on Elliptic Curve Cryptography please read this fine article.

The library supports the following curves:

• secp112r1
• secp256k1
• nistp192
• nistp224
• nistp256 / secp256r1
• nistp384 / secp384r1
• nistp521

During ECDSA, a random value k is required. It is acceptable to use a true RNG to generate this value, but should the same k value ever be repeatedly used for a key, an attacker can recover that signing key. The HMAC random generator can derive a deterministic k value from the message hash and private key, voiding this concern.

The library uses a non-branching Montgomery ladder for scalar multiplication, as it's constant time and avoids secret dependant branches.

License

This package is released under the MIT license.

Requirements

• PHP 8.0+
• composer
• ext-gmp

Installation

You can install this library via Composer :

composer require public-square/phpecc

Contribute

Please open a pull request.

Usage

Examples:

• Key generation
• ECDH exchange
• Signature creation
• Signature verification