/**
* Returns the compressed public key value
*
* @return string
*/
public function __toString()
{
if (is_null($this->x)) {
return '';
}
if (Math::mod('0x' . $this->y, '0x02') == '1') {
return sprintf('03%s', $this->x);
} else {
return sprintf('02%s', $this->x);
}
}
/**
* Decodes $data from BASE-58 format
*
* @param string $data
*
* @return string
*/
public static function decode($data)
{
for ($return = '0', $i = 0; $i < strlen($data); $i++) {
$current = strpos(self::BASE58_CHARS, $data[$i]);
$return = Math::mul($return, '58');
$return = Math::add($return, $current);
}
$return = Util::encodeHex($return);
for ($i = 0; $i < strlen($data) && substr($data, $i, 1) == '1'; $i++) {
$return = '00' . $return;
}
if (strlen($return) % 2 != 0) {
$return = '0' . $return;
}
return $return;
}
public function testGenerate()
{
if (extension_loaded('gmp')) {
\Bitpay\Math\Math::setEngine(new \Bitpay\Math\GmpEngine());
} elseif (extension_loaded('bcmath')) {
\Bitpay\Math\Math::setEngine(new \Bitpay\Math\BcEngine());
} else {
\Bitpay\Math\Math::setEngine(new \Bitpay\Math\RpEngine());
}
$priKey = new PrivateKey();
$this->assertNotNull($priKey);
$this->assertNull($priKey->getHex());
$this->assertNull($priKey->getDec());
$priKey->generate();
$this->assertEquals(64, strlen($priKey->getHex()));
$this->assertGreaterThanOrEqual(72, strlen($priKey->getDec()));
}
/**
* Converts hex value into octet (byte) string
*
* @param string
*
* @return string
*/
public static function binConv($hex)
{
$rem = '';
$dv = '';
$byte = '';
$digits = array();
for ($x = 0; $x < 256; $x++) {
$digits[$x] = chr($x);
}
if (substr(strtolower($hex), 0, 2) != '0x') {
$hex = '0x' . strtolower($hex);
}
while (Math::cmp($hex, 0) > 0) {
$dv = Math::div($hex, 256);
$rem = Math::mod($hex, 256);
$hex = $dv;
$byte = $byte . $digits[$rem];
}
return strrev($byte);
}
/**
* Encodes keypair data to PEM format.
*
* @param array $keypair The keypair info.
* @return string The data to decode.
* @throws \Exception
*/
public function pemEncode($keypair)
{
if (is_array($keypair) && (strlen($keypair[0]) < 64 || strlen($keypair[1]) < 128)) {
throw new \Exception('Invalid or corrupt secp256k1 keypair provided. Cannot decode the supplied PEM data.');
}
$dec = '';
$byte = '';
$beg_ec_text = '';
$end_ec_text = '';
$ecpemstruct = array();
$digits = array();
for ($x = 0; $x < 256; $x++) {
$digits[$x] = chr($x);
}
$ecpemstruct = array('sequence_beg' => '30', 'total_len' => '74', 'int_sec_beg' => '02', 'int_sec_len' => '01', 'int_sec_val' => '01', 'oct_sec_beg' => '04', 'oct_sec_len' => '20', 'oct_sec_val' => $keypair[0], 'a0_ele_beg' => 'a0', 'a0_ele_len' => '07', 'obj_id_beg' => '06', 'obj_id_len' => '05', 'obj_id_val' => '2b8104000a', 'a1_ele_beg' => 'a1', 'a1_ele_len' => '44', 'bit_str_beg' => '03', 'bit_str_len' => '42', 'bit_str_val' => '00' . $keypair[1]);
$beg_ec_text = '-----BEGIN EC PRIVATE KEY-----';
$end_ec_text = '-----END EC PRIVATE KEY-----';
$dec = trim(implode($ecpemstruct));
if (strlen($dec) < 230) {
throw new \Exception('Invalid or corrupt secp256k1 keypair provided. Cannot encode the supplied data.');
}
$dec = Util::decodeHex('0x' . $dec);
while (Math::cmp($dec, '0') > 0) {
$dv = Math::div($dec, '256');
$rem = Math::mod($dec, '256');
$dec = $dv;
$byte = $byte . $digits[$rem];
}
$byte = $beg_ec_text . "\r\n" . chunk_split(base64_encode(strrev($byte)), 64) . $end_ec_text;
$this->pemEncoded = $byte;
return $byte;
}
