PHP code example of amashukov / secp256k1-php

1. Go to this page and download the library: Download amashukov/secp256k1-php 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/ */

amashukov / secp256k1-php example snippets


use Amashukov\Secp256k1\Secp256k1;

$p  = Secp256k1::p();   // curve modulus
$n  = Secp256k1::n();   // curve order
$G  = Secp256k1::g();   // generator point ['x' => GMP, 'y' => GMP]

// Public key from a 32-byte private key.
$priv = hex2bin('c85ef7d79691fe79573b1a7064c19c1a9819ebdbd1faaab1a8ec92344438aaf4');
$d    = gmp_import($priv);
$pub  = Secp256k1::scalarMul($G, $d, $p); // ['x' => GMP, 'y' => GMP]


use Amashukov\Secp256k1\Ecdsa;

$msgHash = hex2bin('5e89218a87e0bd6df9fdc62af4a8a87f48c44fcab6cdeefd6c6d3fcdcad1b48d'); // 32 bytes
$privKey = hex2bin('c85ef7d79691fe79573b1a7064c19c1a9819ebdbd1faaab1a8ec92344438aaf4'); // 32 bytes

$signature = Ecdsa::sign($msgHash, $privKey);
// → ['r' => 32 bytes, 's' => 32 bytes, 'v' => 0|1]


$pubKey = "\x04" . str_pad(gmp_export($pub['x']), 32, "\x00", STR_PAD_LEFT)
                 . str_pad(gmp_export($pub['y']), 32, "\x00", STR_PAD_LEFT);

$ok = Ecdsa::verify($msgHash, $pubKey, $signature['r'], $signature['s']);


// Given a (v, r, s) signature triple from an EVM wallet:
$pubKey = Ecdsa::recover($msgHash, $signature['v'], $signature['r'], $signature['s']);
// → 65 raw bytes uncompressed (`04 || x || y`), or null on failure

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