/**
* Encodes $data into BASE-58 format
*
* @param string $data
*
* @return string
*/
public static function encode($data)
{
if (strlen($data) % 2 != 0 || strlen($data) == 0) {
throw new \Exception('Invalid Length');
}
$code_string = self::BASE58_CHARS;
$x = Util::decodeHex($data);
$output_string = '';
while (Math::cmp($x, '0') > 0) {
$q = Math::div($x, 58);
$r = Math::mod($x, 58);
$output_string .= substr($code_string, intval($r), 1);
$x = $q;
}
for ($i = 0; $i < strlen($data) && substr($data, $i, 2) == '00'; $i += 2) {
$output_string .= substr($code_string, 0, 1);
}
$output_string = strrev($output_string);
return $output_string;
}
/**
* Encodes a numeric string into BASE-58 format.
*
* @param string $data
* @return string $output_string
* @throws \Exception
*/
public static function encode($data)
{
$dataLen = strlen($data);
if ($dataLen % 2 != 0 || $dataLen == 0) {
throw new \Exception('Invalid length data string provided to Base58::encode() method.');
}
$code_string = self::BASE58_CHARS;
$x = Util::decodeHex($data);
$output_string = '';
while (Math::cmp($x, '0') > 0) {
$q = Math::div($x, '58');
$r = Math::mod($x, '58');
$output_string .= substr($code_string, intval($r), 1);
$x = $q;
}
for ($i = 0; $i < $dataLen && substr($data, $i, 2) == '00'; $i += 2) {
$output_string .= substr($code_string, 0, 1);
}
$output_string = strrev($output_string);
return $output_string;
}
/**
* 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;
}
/**
* @expectedException Exception
*/
public function testDecodeHexException()
{
Util::decodeHex(new \StdClass());
}
/**
* Generates an uncompressed and compressed EC public key.
*
* @param \Bitpay\PrivateKey $privateKey
* @return \Bitpay\PublicKey
* @throws \Exception
*/
public function generate(PrivateKey $privateKey = null)
{
if ($privateKey instanceof PrivateKey) {
$this->setPrivateKey($privateKey);
}
if (!empty($this->hex)) {
return $this;
}
if (is_null($this->privateKey)) {
throw new \Exception('Please `setPrivateKey` before you generate a public key');
}
if (!$this->privateKey->isGenerated()) {
$this->privateKey->generate();
}
if (!$this->privateKey->isValid()) {
throw new \Exception('Private Key is invalid and cannot be used to generate a public key');
}
$point = new Point('0x' . substr(Secp256k1::G, 2, 64), '0x' . substr(Secp256k1::G, 66, 64));
$R = Util::doubleAndAdd('0x' . $this->privateKey->getHex(), $point);
$RxHex = Util::encodeHex($R->getX());
$RyHex = Util::encodeHex($R->getY());
$RxHex = str_pad($RxHex, 64, '0', STR_PAD_LEFT);
$RyHex = str_pad($RyHex, 64, '0', STR_PAD_LEFT);
$this->x = $RxHex;
$this->y = $RyHex;
$this->hex = sprintf('%s%s', $RxHex, $RyHex);
$this->dec = Util::decodeHex($this->hex);
return $this;
}
