/**
* Create
*
* This function creates a raw transaction from an array of inputs,
* and an array of outputs. It takes essentially the same data is
* bitcoind's createrawtransaction function.
*
* Inputs: Each input is a child array of [txid, vout, and optionally a sequence number.]
* Outputs: Each output is a key in the array: address => $value.
*
* @param array $inputs
* @param array $outputs
* @param string $magic_byte
* @return string/FALSE
*/
public static function create($inputs, $outputs, $magic_byte = '00')
{
// Generate the p2sh byte from the regular byte.
$regular_byte = $magic_byte;
$p2sh_byte = str_pad(gmp_strval(gmp_add(gmp_init($magic_byte, 16), gmp_init('05', 16))), 2, '0', STR_PAD_LEFT);
$tx_array = array('version' => '1');
// Inputs is the set of [txid/vout/scriptPubKey]
$tx_array['vin'] = array();
foreach ($inputs as $input) {
if (!isset($input['txid']) || strlen($input['txid']) !== 64 || !isset($input['vout']) || !is_numeric($input['vout'])) {
return FALSE;
}
$tx_array['vin'][] = array('txid' => $input['txid'], 'vout' => $input['vout'], 'sequence' => isset($input['sequence']) ? $input['sequence'] : 4294967295, 'scriptSig' => array('hex' => ''));
}
// Outputs is the set of [address/amount]
$tx_array['vout'] = array();
foreach ($outputs as $address => $value) {
if (BitcoinLib::validate_address($address, $regular_byte) == FALSE && BitcoinLib::validate_address($address, $p2sh_byte) == FALSE) {
return FALSE;
}
$decode_address = BitcoinLib::base58_decode($address);
$version = substr($decode_address, 0, 2);
$hash = substr($decode_address, 2, 40);
if ($version == $p2sh_byte) {
// OP_HASH160 <scriptHash> OP_EQUAL
$scriptPubKey = "a914{$hash}87";
} else {
// OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
$scriptPubKey = "76a914{$hash}88ac";
}
$tx_array['vout'][] = array('value' => $value, 'scriptPubKey' => array('hex' => $scriptPubKey));
}
$tx_array['locktime'] = 0;
return self::encode($tx_array);
}
public static function import($ext_key)
{
$hex = BitcoinLib::base58_decode($ext_key);
$key['magic_bytes'] = substr($hex, 0, 8);
$magic_byte_info = self::describe_magic_bytes($key['magic_bytes']);
// Die if key type isn't supported by this library.
if ($magic_byte_info == FALSE) {
return FALSE;
}
$key['type'] = $magic_byte_info['type'];
$key['testnet'] = $magic_byte_info['testnet'];
$key['network'] = $magic_byte_info['network'];
$key['version'] = $magic_byte_info['version'];
$key['depth'] = gmp_strval(gmp_init(substr($hex, 8, 2), 16), 10);
$key['fingerprint'] = substr($hex, 10, 8);
$key['i'] = substr($hex, 18, 8);
$key['address_number'] = self::get_address_number($key['i']);
$key['chain_code'] = substr($hex, 26, 64);
if ($key['type'] == 'public') {
$key_start_position = 90;
$offset = 66;
} else {
$key_start_position = 92;
$offset = 64;
}
$key['key'] = substr($hex, $key_start_position, $offset);
// Validate obtained key:
$validation = $key['type'] == 'public' ? BitcoinLib::validate_public_key($key['key']) : self::check_valid_hmac_key($key['key']);
return $validation ? $key : FALSE;
}
