I am trying to get a standalone PHP code without any external dependency to generate an Ethereum address/key pair. So I asked OpenAI ChatGPT to write the code for me. I got two different versions from it...
Version 1include "keccak.php";
use kornrunner\Keccak;
// Generate a random private key
$private_key = bin2hex(openssl_random_pseudo_bytes(32));
// Compute the public key from the private key using elliptic curve cryptography
$public_key = '0x'.bin2hex(gmp_export(gmp_mul(gmp_init('0x'.bin2hex(openssl_random_pseudo_bytes(32)), 16), gmp_init('0x'.bin2hex(gmp_powm(gmp_init(2), gmp_init('0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0', 16), gmp_init('0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A1', 16))), 16))));
// Compute the Keccak-256 hash of the public key (as a hex string)
$address = '0x' . substr(Keccak::hash(hex2bin(substr($public_key, 2)), 256), -40);
echo "Private key: $private_key
";
echo "Address: $address
";
Version 2include "keccak.php";
use kornrunner\Keccak;
function generate_ethereum_address() {
// Generate a new private key
$privateKey = bin2hex(random_bytes(32));
echo "Private Key: " . $privateKey. "
";
// Derive the public key from the private key
$publicKey = hex2bin('04' . str_pad(gmp_strval(gmp_init(substr($privateKey, 0, 64), 16), 16), 64, '0', STR_PAD_LEFT) . str_pad(gmp_strval(gmp_init(substr($privateKey, 64), 16), 16), 64, '0', STR_PAD_LEFT));
// Generate the Ethereum address from the public key
$address = '0x' . substr(Keccak::hash(substr($publicKey, 1), 256), -40);
// Return the Ethereum address
return $address;
}
// Generate an Ethereum address
$address = generate_ethereum_address();
// Output the Ethereum address
echo "Address: " . $address. "
";
For Keccak, this code is used -
https://github.com/kornrunner/php-keccak/blob/main/src/Keccak.phpSample o/p of Version 1 is...Private key: 1941069a40cc71a83b8df773e0b45cdb8aa70b748710c82eace662c07ede4cf8
Address: 0x753215ef5214d2494df5e19dafa5644d034d201c
Sample o/p of Version 2 is...Private key: 1941069a40cc71a83b8df773e0b45cdb8aa70b748710c82eace662c07ede4cf8
Address: 0x753215ef5214d2494df5e19dafa5644d034d201c
Clearly, address generated by both versions are wrong and AI is unable to fix the code. Can any of you please fix it?