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<?php |
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declare(strict_types=1); |
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namespace SKien\PNServer; |
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/** |
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* Helper trait containing some methods used by multiple classes in package. |
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* |
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* @package PNServer |
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* @author Stefanius <[email protected]> |
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* @copyright MIT License - see the LICENSE file for details |
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*/ |
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trait PNServerHelper |
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{ |
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/** |
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* Get classname without namespace. |
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* @param mixed $o |
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* @return string |
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*/ |
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public static function className($o) : string |
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{ |
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$strName = ''; |
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if (is_object($o)) { |
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$path = explode('\\', get_class($o)); |
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$strName = array_pop($path); |
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} |
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return $strName; |
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} |
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/** |
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* Encode data to Base64URL. |
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* @param string $data |
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* @return string encoded string |
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*/ |
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public static function encodeBase64URL(string $data) : string |
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{ |
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// Convert Base64 to Base64URL by replacing “+” with “-” and “/” with “_” |
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$url = strtr(base64_encode($data), '+/', '-_'); |
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// Remove padding character from the end of line and return the Base64URL result |
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return rtrim($url, '='); |
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} |
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/** |
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* Decode data from Base64URL. |
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* If the strict parameter is set to TRUE then the function will return false |
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* if the input contains character from outside the base64 alphabet. Otherwise |
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* invalid characters will be silently discarded. |
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* @param string $data |
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* @param boolean $strict |
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* @return string |
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*/ |
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public static function decodeBase64URL(string $data, bool $strict = false) : string |
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{ |
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// Convert Base64URL to Base64 by replacing “-” with “+” and “_” with “/” |
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$b64 = strtr($data, '-_', '+/'); |
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// Decode Base64 string and return the original data |
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$strDecoded = base64_decode($b64, $strict); |
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return $strDecoded !== false ? $strDecoded : 'error'; |
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} |
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public static function getP256PEM(string $strPublicKey, string $strPrivateKey) : string |
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{ |
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$der = self::p256PrivateKey($strPrivateKey); |
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$der .= $strPublicKey; |
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$pem = '-----BEGIN EC PRIVATE KEY-----' . PHP_EOL; |
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$pem .= chunk_split(base64_encode($der), 64, PHP_EOL); |
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$pem .= '-----END EC PRIVATE KEY-----' . PHP_EOL; |
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return $pem; |
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} |
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private static function p256PrivateKey(string $strPrivateKey) : string |
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{ |
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$aUP = \unpack('H*', str_pad($strPrivateKey, 32, "\0", STR_PAD_LEFT)); |
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$key = ''; |
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if ($aUP !== false) { |
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$key = $aUP[1]; |
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} |
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return pack( |
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'H*', |
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'3077' // SEQUENCE, length 87+length($d)=32 |
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. '020101' // INTEGER, 1 |
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. '0420' // OCTET STRING, length($d) = 32 |
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. $key |
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. 'a00a' // TAGGED OBJECT #0, length 10 |
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. '0608' // OID, length 8 |
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. '2a8648ce3d030107' // 1.3.132.0.34 = P-256 Curve |
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. 'a144' // TAGGED OBJECT #1, length 68 |
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. '0342' // BIT STRING, length 66 |
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. '00' // prepend with NUL - pubkey will follow |
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); |
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} |
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/** |
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* @param string $der |
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* @return string|false |
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*/ |
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public static function signatureFromDER(string $der) |
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{ |
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$sig = false; |
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$R = false; |
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$S = false; |
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$aUP = \unpack('H*', $der); |
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$hex = ''; |
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if ($aUP !== false) { |
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$hex = $aUP[1]; |
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} |
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if ('30' === \mb_substr($hex, 0, 2, '8bit')) { |
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// SEQUENCE |
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if ('81' === \mb_substr($hex, 2, 2, '8bit')) { |
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// LENGTH > 128 |
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$hex = \mb_substr($hex, 6, null, '8bit'); |
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} else { |
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$hex = \mb_substr($hex, 4, null, '8bit'); |
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} |
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if ('02' === \mb_substr($hex, 0, 2, '8bit')) { |
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// INTEGER |
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$Rl = (int) \hexdec(\mb_substr($hex, 2, 2, '8bit')); |
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$R = self::retrievePosInt(\mb_substr($hex, 4, $Rl * 2, '8bit')); |
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$R = \str_pad($R, 64, '0', STR_PAD_LEFT); |
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$hex = \mb_substr($hex, 4 + $Rl * 2, null, '8bit'); |
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if ('02' === \mb_substr($hex, 0, 2, '8bit')) { |
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// INTEGER |
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$Sl = (int) \hexdec(\mb_substr($hex, 2, 2, '8bit')); |
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$S = self::retrievePosInt(\mb_substr($hex, 4, $Sl * 2, '8bit')); |
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$S = \str_pad($S, 64, '0', STR_PAD_LEFT); |
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} |
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} |
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} |
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if ($R !== false && $S !== false) { |
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$sig = \pack('H*', $R . $S); |
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} |
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return $sig; |
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} |
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private static function retrievePosInt(string $data) : string |
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{ |
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while ('00' === \mb_substr($data, 0, 2, '8bit') && \mb_substr($data, 2, 2, '8bit') > '7f') { |
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$data = \mb_substr($data, 2, null, '8bit'); |
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} |
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return $data; |
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} |
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public static function getXYFromPublicKey(string $strKey, string &$x, string &$y) : bool |
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{ |
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$bSucceeded = false; |
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$hexData = bin2hex($strKey); |
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if (mb_substr($hexData, 0, 2, '8bit') === '04') { |
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$hexData = mb_substr($hexData, 2, null, '8bit'); |
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$dataLength = mb_strlen($hexData, '8bit'); |
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$x = hex2bin(mb_substr($hexData, 0, $dataLength / 2, '8bit')); |
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$y = hex2bin(mb_substr($hexData, $dataLength / 2, null, '8bit')); |
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} |
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return $bSucceeded; |
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} |
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} |
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Stefanius67 /
PNServer
