Ripple Validator HEX to public key

validator-hex-to-pub.php

<?php

function decodeHex($hex) {
    $chars = '0123456789ABCDEF';
    $return = '0';
    for ($i = 0; $i < strlen($hex); $i++) {
        $current = (string) strpos($chars, $hex[$i]);
        $return = (string) bcmul($return, '16', 0);
        $return = (string) bcadd($return, $current, 0);
    }
    return $return;
}

function encodeBase58($hex) {
    $orighex = $hex;    
    $chars = 'rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz'; // Ripple alphabet
    $hex = decodeHex($hex);
    $return = '';
    while (bccomp($hex, 0) == 1) {
        $dv = (string) bcdiv($hex, '58', 0);
        $rem = (integer) bcmod($hex, '58');
        $hex = $dv;
        $return = $return.$chars[$rem];
    }
    $return = strrev($return);
    for ($i = 0; $i < strlen($orighex) && substr($orighex, $i, 2) == '00'; $i += 2) { $return = '1' . $return; }
    return $return;
}

/// Here we go.

$hex = 'ED47A79FDB712056366C08617357AF413708CA11499FD42634FDEE42A721360355';
$extendedKey = '1C' . $hex;
$buffer = $extendedKey; // We'll modify this one.

// sha256.x2
$buffer = strtoupper(hash('sha256', hex2bin($buffer)));
$buffer = strtoupper(hash('sha256', hex2bin($buffer)));

// (0, 8) since 4 chars are 8 bytes
$checksum = substr($buffer, 0, 8);

// Append the checksum
$buffer = $extendedKey . $checksum;

// Base58 encode
$buffer = encodeBase58($buffer);

echo $buffer;