php-secp256k1

```lang=bash $ composer require kornrunner/secp256k1, _(*1)


## Usage

Sign a message:

```php
<?php

require_once 'vendor/autoload.php';

use kornrunner\Secp256k1;
use kornrunner\Serializer\HexSignatureSerializer;

$secp256k1 = new Secp256k1();

// return signature contains r, s and recovery param (v).
// message and privateKey are hex strings
$signature = $secp256k1->sign($message, $privateKey);

// get r
$r = $signature->getR();

// get s
$s = $signature->getS();

// get recovery param
$v = $signature->getRecoveryParam();

// encode to hex
$serializer = new HexSignatureSerializer();
$signatureString = $serializer->serialize($signature);

// or you can call toHex
$signatureString = $signature->toHex();

Verify a message:, _(*2)

<?php

require_once 'vendor/autoload.php';

use kornrunner\Secp256k1;

$secp256k1 = new Secp256k1();

// signature was created by sign method
// hash and publicKey are hex strings
$isVerified = $secp256k1->verify($hash, $signature, $publicKey);