PHP code example of cast / ecdsa

1. Go to this page and download the library: Download cast/ecdsa library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

cast / ecdsa example snippets


composer




use function Cast\Crypto\ECDSA\secp256k1\publicKey;
use function Cast\Crypto\ECDSA\secp256k1\sign;
use function Cast\Crypto\ECDSA\secp256k1\verify;

// key pair generation:
$privateKey = bin2hex(random_bytes(32)); // 18e14a7b6a307f426a94f8114701e7c8e774e7f9a47e2c2035db29a206321725
$publicKey = publicKey($privateKey); // 0250863AD64A87AE8A2FE83C1AF1A8403CB53F53E486D8511DAD8A04887E5B2352

// signature generation:
$message = "public data to sign";
$messageHash = hash('sha256', $message); // hex, any algo
$salt = bin2hex(random_bytes(32)); // the sign request id, onetime random number
$signature = sign($salt, $messageHash, $privateKey); // 78be7c53361d9bd7d32acc917d79aee05f633d3ae33a14040d179a6f4816aa3a

// signature verifying:
$verified = verify($signature, $messageHash, $salt, $publicKey); // true