Can I sign a text with a Bitcoin address using PHP only?

Question

I have the following...

Bitcoin Address: 1H2zzoAncRcQYihgTMYtX55ioXYErmYQQC

Public Key: 021FE07FBBB27AD176F1E082950474CD6252FB86751B893BC0887962B008830798

WIF Key: Kzy3fea4xCwLczAj3g8TYvDw6QRKCMqvVZX2J7vaXgy78VhieRdV

HEX Key: 6FCE4A50EA529B2D4B3E9671B5B0AA0D5D19266D778FB005F25AE4599D5D2BA0

I need to sign: Just a sample text

I want this result: H9saC8UiO0n++3dHZev/apRXkQCrqFofvW9vMpzWqPKsYTNvx/4bdtbdcMORGvNblQknT34UErnwEM3fxTZII0U=

How can I code it only in PHP without calling any API or invoking any JS library?

Answer 1

A bit late but I created a PHP library for cryptocurrency. You can use this library to achieve what you want.

You can use it like this:

require('CryptoPHP.php');
$wif_key = 'Kzy3fea4xCwLczAj3g8TYvDw6QRKCMqvVZX2J7vaXgy78VhieRdV'; //this is your wif key
$private_key = $this -> wif2key($wif_key); //get the wif key to a hex private key
$hash = 'Just a sample text'; //this is what you're trying to sign.

$signature = $this -> sign($hash,$private_key);