/**
* Decode Mnemonic
*
* This function decodes a string of 12 words to convert to the electrum
* seed. This is an implementation of http://tools.ietf.org/html/rfc1751,
* which is how electrum generates a 128-bit key from 12 words.
*
* @param string $words
* @return string
*/
public static function decode_mnemonic($words)
{
$words = explode(" ", $words);
$out = '';
$n = 1626;
for ($i = 0; $i < count($words) / 3; $i++) {
$a = 3 * $i;
list($word1, $word2, $word3) = array($words[$a], $words[$a + 1], $words[$a + 2]);
$index_w1 = array_search($word1, self::$words);
$index_w2 = array_search($word2, self::$words) % $n;
$index_w3 = array_search($word3, self::$words) % $n;
$x = $index_w1 + $n * \gmp_Utils::gmp_mod2($index_w2 - $index_w1, $n) + $n * $n * \gmp_Utils::gmp_mod2($index_w3 - $index_w2, $n);
$out .= BitcoinLib::hex_encode($x);
}
return $out;
}
/**
* Redeem Scripts To Wallet
*
* This function extends on whatever data is in the $wallet array, by
* adding script hash addresses to the wallet, and linking keys in the
* multisignature address with keys in the wallet.
* Adds each redeemScript to the referenced $wallet.
*
* @param array $wallet
* @param array $redeem_scripts
* @param string $magic_byte
*/
public static function redeem_scripts_to_wallet(&$wallet, array $redeem_scripts = array(), $magic_byte = '05')
{
if (count($redeem_scripts) > 0) {
foreach ($redeem_scripts as $script) {
$decode = self::decode_redeem_script($script);
if ($decode == FALSE) {
continue;
}
$scripthash = BitcoinLib::hash160($script);
$keys = array();
foreach ($decode['keys'] as $key) {
$keyhash = BitcoinLib::hash160($key);
if (isset($wallet[$keyhash])) {
$keys[] = $wallet[$keyhash];
}
}
$wallet[$scripthash] = array('type' => 'scripthash', 'script' => $script, 'required_signature_count' => $decode['m'], 'address' => BitcoinLib::hash160_to_address($scripthash, $magic_byte), 'public_keys' => $decode['keys'], 'keys' => $keys);
}
}
}
/**
* Key To Address
*
* This function accepts a bip32 extended key, and converts it to a
* bitcoin address.
*
* @param string $extended_key
* @param string $address_version
* return string/FALSE
*/
public static function key_to_address($extended_key)
{
$import = self::import($extended_key);
if ($import['type'] == 'public') {
$public = $import['key'];
} else {
if ($import['type'] == 'private') {
$public = BitcoinLib::private_key_to_public_key($import['key'], TRUE);
} else {
return FALSE;
}
}
// Convert the public key to the address.
return BitcoinLib::public_key_to_address($public, $import['version']);
}
