sign.php

sign.php

<? php
  
# On sender side:
$data = 'Beer::PHP';
$hash = hash(CRYPT_SHA256, $data);
$sign = encryptByPrivateKey($hash);
$result = send('receiver_address', [
    'data' => $data,
    'sign' => $sign
]);


# On receiver side:
[$data, $sign] = getFromRequest();
$hash = hash(CRYPT_SHA256, $data);
$decryptedHash = decryptByPublicKey($sign);

if ($hash !== $decryptedHash) {
    // Something went wrong 
}

// $data is valid