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<?php |
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/* Based on PHPSECLIB: https://github.com/phpseclib/phpseclib/blob/master/phpseclib/File/ASN1.php */ |
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namespace vakata\asn1; |
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use DateTime; |
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/** |
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* A class handling ASN1 decoding. |
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*/ |
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class Decoder |
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{ |
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protected $reader; |
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/** |
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* Create an instance by passing in an instantiated reader. |
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* |
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* @param Reader $reader |
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*/ |
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public function __construct(Reader $reader) |
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{ |
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$this->reader = $reader; |
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} |
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/** |
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* Create a new instance from an ASN1 string. |
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* |
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* @param string $data the ASN1 data |
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* @return Decoder |
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*/ |
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public static function fromString($data) |
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{ |
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return new static(Reader::fromString($data)); |
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} |
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/** |
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* Create a new instance from a file. |
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* |
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* @param string $path the path to the file to parse |
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* @return Decoder |
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*/ |
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public static function fromFile($path) |
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{ |
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return new static(Reader::fromFile($path)); |
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} |
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public function getReader() |
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{ |
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return $this->reader; |
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} |
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protected function header() |
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{ |
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$start = $this->reader->pos(); |
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$identifier = ord($this->reader->byte()); |
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$constructed = ($identifier >> 5) & 1; // 6th bit |
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$class = ($identifier >> 6) & 3; // 7th and 8th bits |
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$tag = $identifier & 31; // first 5 bits |
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if ($tag === 31) { // long tag (read each 7 bits until the 8th is 0) |
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$tag = 0; |
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while (true) { |
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$temp = ord($this->reader->byte()); |
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$tag <<= 7; |
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$tag |= $temp & 127; |
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if (($temp & 128) === 0) { |
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break; |
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} |
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} |
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} |
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if ($tag === 0 && $class === 0) { |
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return [ |
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'constructed' => $constructed, |
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'class' => $class, |
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'tag' => $tag, |
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'start' => $start, |
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'length' => ($this->reader->pos() - $start), |
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'content_start' => $this->reader->pos(), |
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'content_length' => 0 |
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]; |
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} |
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$temp = ord($this->reader->byte()); |
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$length = null; |
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if ($temp === 128) { |
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// indefinite |
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$length = null; |
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} elseif ($temp & 128) { |
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// long form |
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$octets = $temp & 127; |
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$length = 0; |
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for ($i = 0; $i < $octets; $i++) { |
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$length <<= 8; |
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$length |= ord($this->reader->byte()); |
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} |
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} else { |
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// short form |
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$length = $temp; |
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} |
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return [ |
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'constructed' => $constructed, |
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'class' => $class, |
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'tag' => $tag, |
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'start' => $start, |
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'length' => $length !== null ? $length + ($this->reader->pos() - $start) : null, |
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'content_start' => $this->reader->pos(), |
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'content_length' => $length |
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]; |
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} |
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protected function decode($header) |
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{ |
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$contents = $header['content_length'] > 0 ? |
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$this->reader->chunk($header['content_start'], $header['content_length']) : |
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''; |
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if ($header['class'] !== ASN1::CLASS_UNIVERSAL) { |
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return $contents; |
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} |
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return $this->decodeContents($header['tag'], $header['constructed'], $contents); |
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} |
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protected function decodeContents($tag, $constructed, $contents) |
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{ |
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switch ($tag) { |
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case ASN1::TYPE_BOOLEAN: |
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return (bool)ord($contents[0]); |
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case ASN1::TYPE_INTEGER: |
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return ASN1::fromBase256($contents); |
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case ASN1::TYPE_ENUMERATED: |
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return (int)base_convert(ASN1::fromBase256($contents), 2, 10); |
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case ASN1::TYPE_REAL: |
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// TODO: read the specs |
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return false; |
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case ASN1::TYPE_BIT_STRING: |
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if ($constructed) { |
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$temp = static::fromString($contents)->values(); |
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$real = ''; |
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for ($i = 0; $i < count($temp) - 1; $i++) { |
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$real .= $temp['value']; |
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} |
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return $temp[count($temp) - 1]['value'][0] . $real . substr($temp[$i]['value'], 1); |
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} |
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return $contents; |
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case ASN1::TYPE_OCTET_STRING: |
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if ($constructed) { |
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return implode('', array_map(function ($v) { |
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if (!is_array($v)) { |
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return $v; |
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} |
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return $v['value']; |
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}, static::fromString($contents)->values())); |
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} |
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return $contents; |
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case ASN1::TYPE_BMP_STRING: |
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return extension_loaded("iconv") ? iconv('UCS-2BE', 'UTF-8', $contents) : $contents; |
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case ASN1::TYPE_UNIVERSAL_STRING: |
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return extension_loaded("iconv") ? iconv('UCS-4BE', 'UTF-8', $contents) : $contents; |
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case ASN1::TYPE_NULL: |
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return null; |
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case ASN1::TYPE_UTC_TIME: |
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$format = 'YmdHis'; |
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$matches = []; |
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if (preg_match('#^(\d{10})(Z|[+-]\d{4})$#', $contents, $matches)) { |
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$contents = $matches[1] . '00' . $matches[2]; |
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} |
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$prefix = substr($contents, 0, 2) >= 50 ? '19' : '20'; |
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$contents = $prefix . $contents; |
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if ($contents[strlen($contents) - 1] == 'Z') { |
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$contents = substr($contents, 0, -1) . '+0000'; |
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} |
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if (strpos($contents, '-') !== false || strpos($contents, '+') !== false) { |
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$format .= 'O'; |
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} |
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$result = @DateTime::createFromFormat($format, $contents); |
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return $result ? $result->getTimestamp() : false; |
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case ASN1::TYPE_GENERALIZED_TIME: |
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$format = 'YmdHis'; |
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if (strpos($contents, '.') !== false) { |
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$format .= '.v'; |
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} |
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if ($contents[strlen($contents) - 1] == 'Z') { |
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$contents = substr($contents, 0, -1) . '+0000'; |
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} |
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if (strpos($contents, '-') !== false || strpos($contents, '+') !== false) { |
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$format .= 'O'; |
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} |
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$result = @DateTime::createFromFormat($format, $contents); |
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return $result ? $result->format(strpos($contents, '.') !== false ? 'U.v' : 'U') : false; |
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case ASN1::TYPE_OBJECT_IDENTIFIER: |
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$temp = ord($contents[0]); |
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$real = sprintf('%d.%d', floor($temp / 40), $temp % 40); |
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$obid = 0; |
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// process septets |
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for ($i = 1; $i < strlen($contents); $i++) { |
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$temp = ord($contents[$i]); |
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$obid <<= 7; |
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$obid |= $temp & 0x7F; |
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if (~$temp & 0x80) { |
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$real .= '.' . $obid; |
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$obid = 0; |
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} |
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} |
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return $real; |
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default: |
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return $contents; |
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} |
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} |
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/** |
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* Dump the parsed structure of the ASN1 data. |
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* |
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* @param mixed $max internal - do not use |
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* @return mixed in most cases this is an array, as all complex structures are either a sequence or a set |
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*/ |
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public function structure($max = null) |
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{ |
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$skeleton = []; |
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while (!$this->reader->eof() && ($max === null || $this->reader->pos() < $max)) { |
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$header = $this->header(); |
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if ($header['class'] === 0 && $header['tag'] === 0) { |
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if ($max === null) { |
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break; |
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} else { |
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continue; |
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} |
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} |
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if ($header['class'] !== ASN1::CLASS_UNIVERSAL && $header['constructed']) { |
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$header['children'] = $this->structure( |
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$header['length'] ? $header['start'] + $header['length'] - 1 : null |
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); |
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if ($header['length'] === null) { |
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$this->reader->byte(); |
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$header['length'] = $this->reader->pos() - $header['start']; |
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$header['content_length'] = $this->reader->pos() - $header['content_start']; |
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} |
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$skeleton[] = $header; |
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} else { |
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if ($header['class'] === ASN1::CLASS_UNIVERSAL && |
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in_array($header['tag'], [ASN1::TYPE_SET, ASN1::TYPE_SEQUENCE]) |
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) { |
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$header['children'] = $this->structure( |
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$header['length'] ? $header['start'] + $header['length'] - 1 : null |
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); |
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if ($header['length'] === null) { |
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$this->reader->byte(); |
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$header['length'] = $this->reader->pos() - $header['start']; |
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$header['content_length'] = $this->reader->pos() - $header['content_start']; |
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} |
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} else { |
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if ($header['length'] === null) { |
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$this->reader->readUntil(chr(0).chr(0)); |
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$header['length'] = $this->reader->pos() - $header['start']; |
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$header['content_length'] = $this->reader->pos() - $header['content_start']; |
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} else { |
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if ($header['content_length'] > 0) { |
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$this->reader->bytes($header['content_length']); |
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} |
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} |
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} |
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if (!isset($header['children'])) { |
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$pos = $this->reader->pos(); |
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$header['value'] = $this->decode($header); |
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$this->reader->seek($pos); |
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} |
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$skeleton[] = $header; |
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} |
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} |
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return $skeleton; |
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} |
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/** |
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* Dump the parsed values only. |
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* |
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266
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* @param mixed $skeleton internal - do not use |
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267
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* @return mixed in most cases this is an array, as all complex structures are either a sequence or a set |
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*/ |
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public function values($skeleton = null) |
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{ |
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$skeleton = $skeleton ?? $this->structure(); |
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foreach ($skeleton as $k => $v) { |
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if (isset($v['children'])) { |
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$skeleton[$k] = $this->values($v['children']); |
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} else { |
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$skeleton[$k] = $v['value'] ?? null; |
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} |
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} |
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return $skeleton; |
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} |
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/** |
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282
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* Map the parsed data to a map |
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* |
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284
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* @param array $map the map to use - look in the structure classes for example map arrays |
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285
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* @param mixed $skeleton internal - do not use |
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286
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* @return mixed in most cases this is an array, as all complex structures are either a sequence or a set |
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287
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*/ |
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288
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public function map($map, $skeleton = null) |
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289
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{ |
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290
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$null = null; |
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291
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if ($skeleton === null && $this->reader->pos() !== 0) { |
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$this->reader->rewind(); |
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293
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} |
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294
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$skeleton = $skeleton ?? $this->structure()[0] ?? null; |
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295
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if (!isset($skeleton)) { |
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296
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throw new ASN1Exception('No decoded data for map'); |
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297
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} |
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298
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if ($skeleton['class'] !== ASN1::CLASS_UNIVERSAL) { |
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if ($map['tag'] === ASN1::TYPE_CHOICE) { |
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300
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foreach ($map['children'] as $child) { |
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301
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if (isset($child['name']) && (int)$skeleton['tag'] === (int)$child['name']) { |
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$map = $child; |
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303
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if (isset($child['value']) && $child['value']) { |
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return $child['value']; |
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305
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} |
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306
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break; |
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307
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} |
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308
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} |
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309
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} |
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310
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} |
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311
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if ($skeleton['class'] !== ASN1::CLASS_UNIVERSAL) { |
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312
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|
|
if (isset($map['implicit']) && $map['implicit']) { |
|
313
|
|
|
$skeleton['class'] = ASN1::CLASS_UNIVERSAL; |
|
314
|
|
|
$skeleton['tag'] = $map['tag']; |
|
315
|
|
|
if (isset($skeleton['value'])) { |
|
316
|
|
|
$skeleton['value'] = $this->decodeContents($skeleton['tag'], true, $skeleton['value']); |
|
317
|
|
|
} |
|
318
|
|
|
} else { |
|
319
|
|
|
$skeleton = $skeleton['children'][0] ?? null; |
|
320
|
|
|
} |
|
321
|
|
|
} |
|
322
|
|
|
if ($map['tag'] === ASN1::TYPE_CHOICE) { |
|
323
|
|
|
foreach ($map['children'] as $child) { |
|
324
|
|
|
if ($skeleton['tag'] === $child['tag']) { |
|
325
|
|
|
$map = $child; |
|
326
|
|
|
if (isset($child['value']) && $child['value']) { |
|
327
|
|
|
return $child['value']; |
|
328
|
|
|
} |
|
329
|
|
|
break; |
|
330
|
|
|
} |
|
331
|
|
|
} |
|
332
|
|
|
} |
|
333
|
|
|
if (in_array($map['tag'], [ASN1::TYPE_SEQUENCE, ASN1::TYPE_SET]) && |
|
334
|
|
|
in_array($skeleton['tag'], [ASN1::TYPE_SEQUENCE, ASN1::TYPE_SET])) { |
|
335
|
|
|
$map['tag'] = $skeleton['tag']; |
|
336
|
|
|
} |
|
337
|
|
|
if ($map['tag'] === ASN1::TYPE_ANY && isset($skeleton['tag'])) { |
|
338
|
|
|
$map['tag'] = $skeleton['tag']; |
|
339
|
|
|
} |
|
340
|
|
|
if (!in_array($map['tag'], [ASN1::TYPE_ANY, ASN1::TYPE_ANY_RAW, ASN1::TYPE_ANY_SKIP, ASN1::TYPE_ANY_DER]) && |
|
341
|
|
|
$map['tag'] !== $skeleton['tag'] |
|
342
|
|
|
) { |
|
343
|
|
|
if (!isset($map['optional']) || !$map['optional']) { |
|
344
|
|
|
throw new ASN1Exception('Decoded data does not match mapping - ' . $skeleton['tag']); |
|
345
|
|
|
} |
|
346
|
|
|
return $null; |
|
347
|
|
|
} else { |
|
348
|
|
|
switch ($map['tag']) { |
|
349
|
|
|
case ASN1::TYPE_ANY_DER: |
|
350
|
|
|
$temp = $this->reader->chunk($skeleton['start'], $skeleton['length']); |
|
351
|
|
|
return $temp; |
|
352
|
|
|
case ASN1::TYPE_ANY_SKIP: |
|
353
|
|
|
return $null; |
|
354
|
|
|
case ASN1::TYPE_ANY_RAW: |
|
355
|
|
|
return $skeleton['value'] ?? null; |
|
356
|
|
|
case ASN1::TYPE_SET: |
|
357
|
|
|
if (isset($map['repeat'])) { |
|
358
|
|
|
$result = []; |
|
359
|
|
|
foreach ($skeleton['children'] as $v) { |
|
360
|
|
|
$result[] = $this->map($map['repeat'], $v); |
|
361
|
|
|
} |
|
362
|
|
|
return $result; |
|
363
|
|
|
} else { |
|
364
|
|
|
if (!isset($map['children'])) { |
|
365
|
|
|
return $null; |
|
366
|
|
|
} |
|
367
|
|
|
$temp = $skeleton['children']; |
|
368
|
|
|
$result = []; |
|
369
|
|
|
// named first |
|
370
|
|
|
foreach ($map['children'] as $k => $v) { |
|
371
|
|
|
if (isset($v['name'])) { |
|
372
|
|
|
$result[$k] = null; |
|
373
|
|
|
foreach ($temp as $kk => $vv) { |
|
374
|
|
|
if ($vv['class'] !== ASN1::CLASS_UNIVERSAL && (int)$v['name'] === $vv['tag']) { |
|
375
|
|
|
try { |
|
376
|
|
|
if (isset($v['implicit']) && $v['implicit']) { |
|
377
|
|
|
$vv['class'] = ASN1::CLASS_UNIVERSAL; |
|
378
|
|
|
$vv['tag'] = $map['tag']; |
|
379
|
|
|
if (isset($vv['value'])) { |
|
380
|
|
|
$vv['value'] = $this->decodeContents($vv['tag'], true, $vv['value']); |
|
381
|
|
|
} |
|
382
|
|
|
} else { |
|
383
|
|
|
$vv = $vv['children'][0] ?? null; |
|
384
|
|
|
} |
|
385
|
|
|
$result[$k] = $this->map($v, $vv); |
|
386
|
|
|
unset($temp[$kk]); |
|
387
|
|
|
break; |
|
388
|
|
|
} catch (ASN1Exception $e) { |
|
389
|
|
|
// continue trying other children in case of failure |
|
390
|
|
|
} |
|
391
|
|
|
} |
|
392
|
|
|
} |
|
393
|
|
|
if ($result[$k] === null && (!isset($v['optional']) || !$v['optional'])) { |
|
394
|
|
|
throw new ASN1Exception('Missing tagged type - ' . $k); |
|
395
|
|
|
} |
|
396
|
|
|
} |
|
397
|
|
|
} |
|
398
|
|
|
foreach ($map['children'] as $k => $v) { |
|
399
|
|
|
if (isset($v['name'])) { |
|
400
|
|
|
continue; |
|
401
|
|
|
} |
|
402
|
|
|
$result[$k] = null; |
|
403
|
|
|
foreach ($temp as $kk => $vv) { |
|
404
|
|
|
if ($v['tag'] === $vv['tag'] || |
|
405
|
|
|
in_array( |
|
406
|
|
|
$v['tag'], |
|
407
|
|
|
[ |
|
408
|
|
|
ASN1::TYPE_ANY, |
|
409
|
|
|
ASN1::TYPE_ANY_DER, |
|
410
|
|
|
ASN1::TYPE_ANY_RAW, |
|
411
|
|
|
ASN1::TYPE_ANY_SKIP, |
|
412
|
|
|
ASN1::TYPE_CHOICE |
|
413
|
|
|
] |
|
414
|
|
|
) |
|
415
|
|
|
) { |
|
416
|
|
|
try { |
|
417
|
|
|
$result[$k] = $this->map($v, $vv); |
|
418
|
|
|
unset($temp[$kk]); |
|
419
|
|
|
break; |
|
420
|
|
|
} catch (ASN1Exception $e) { |
|
421
|
|
|
$result[$k] = null; |
|
422
|
|
|
} |
|
423
|
|
|
} |
|
424
|
|
|
} |
|
425
|
|
|
if ($result[$k] === null && (!isset($v['optional']) || !$v['optional'])) { |
|
426
|
|
|
throw new ASN1Exception('Decoded data does not match mapping - ' . $k); |
|
427
|
|
|
} |
|
428
|
|
|
} |
|
429
|
|
|
return $result; |
|
430
|
|
|
} |
|
431
|
|
|
break; |
|
432
|
|
|
case ASN1::TYPE_SEQUENCE: |
|
433
|
|
|
if (isset($map['repeat'])) { |
|
434
|
|
|
$result = []; |
|
435
|
|
|
foreach ($skeleton['children'] as $v) { |
|
436
|
|
|
$result[] = $this->map($map['repeat'], $v); |
|
437
|
|
|
} |
|
438
|
|
|
return $result; |
|
439
|
|
|
} else { |
|
440
|
|
|
if (!isset($map['children'])) { |
|
441
|
|
|
return $null; |
|
442
|
|
|
} |
|
443
|
|
|
$result = []; |
|
444
|
|
|
foreach ($skeleton['children'] as $kk => $vv) { |
|
445
|
|
|
foreach ($map['children'] as $k => $v) { |
|
446
|
|
|
if (isset($v['name'])) { |
|
447
|
|
|
$result[$k] = null; |
|
448
|
|
|
if ($vv['class'] !== ASN1::CLASS_UNIVERSAL && (int)$v['name'] === $vv['tag']) { |
|
449
|
|
|
if (isset($v['implicit']) && $v['implicit']) { |
|
450
|
|
|
$vv['class'] = ASN1::CLASS_UNIVERSAL; |
|
451
|
|
|
$vv['tag'] = $v['tag']; |
|
452
|
|
|
if (isset($vv['value'])) { |
|
453
|
|
|
$vv['value'] = $this->decodeContents($vv['tag'], true, $vv['value']); |
|
454
|
|
|
} |
|
455
|
|
|
} else { |
|
456
|
|
|
$vv = $vv['children'][0] ?? null; |
|
457
|
|
|
} |
|
458
|
|
|
$result[$k] = $this->map($v, $vv); |
|
459
|
|
|
unset($map['children'][$k]); |
|
460
|
|
|
break; |
|
461
|
|
|
} else { |
|
462
|
|
|
if (!isset($v['optional']) || !$v['optional']) { |
|
463
|
|
|
throw new ASN1Exception('Missing tagged type - ' . $k); |
|
464
|
|
|
} |
|
465
|
|
|
} |
|
466
|
|
|
unset($map['children'][$k]); |
|
467
|
|
|
continue; |
|
468
|
|
|
} |
|
469
|
|
|
if ($v['tag'] === $vv['tag'] || |
|
470
|
|
|
in_array( |
|
471
|
|
|
$v['tag'], |
|
472
|
|
|
[ |
|
473
|
|
|
ASN1::TYPE_ANY, |
|
474
|
|
|
ASN1::TYPE_ANY_DER, |
|
475
|
|
|
ASN1::TYPE_ANY_RAW, |
|
476
|
|
|
ASN1::TYPE_ANY_SKIP, |
|
477
|
|
|
ASN1::TYPE_CHOICE |
|
478
|
|
|
] |
|
479
|
|
|
) |
|
480
|
|
|
) { |
|
481
|
|
|
try { |
|
482
|
|
|
unset($map['children'][$k]); |
|
483
|
|
|
$result[$k] = $this->map($v, $vv); |
|
484
|
|
|
break; |
|
485
|
|
|
} catch (ASN1Exception $e) { |
|
486
|
|
|
// continue trying other children in case of failure |
|
487
|
|
|
} |
|
488
|
|
|
} |
|
489
|
|
|
if (!isset($v['optional']) || !$v['optional']) { |
|
490
|
|
|
throw new ASN1Exception('Missing type - ' . $k); |
|
491
|
|
|
} else { |
|
492
|
|
|
$result[$k] = null; |
|
493
|
|
|
unset($map['children'][$k]); |
|
494
|
|
|
} |
|
495
|
|
|
} |
|
496
|
|
|
} |
|
497
|
|
|
return $result; |
|
498
|
|
|
} |
|
499
|
|
|
break; |
|
500
|
|
|
case ASN1::TYPE_OBJECT_IDENTIFIER: |
|
501
|
|
|
$temp = isset($map['resolve']) && $map['resolve'] ? |
|
502
|
|
|
ASN1::OIDtoText($skeleton['value']) : |
|
503
|
|
|
$skeleton['value']; |
|
504
|
|
|
return $temp; |
|
505
|
|
|
case ASN1::TYPE_OCTET_STRING: |
|
506
|
|
|
if (isset($map['der']) && $map['der']) { |
|
507
|
|
|
$temp = static::fromString($skeleton['value']); |
|
508
|
|
|
$temp = isset($map['map']) ? $temp->map($map['map']) : $temp->values(); |
|
509
|
|
|
return $temp; |
|
510
|
|
|
} else { |
|
511
|
|
|
$temp = isset($map['raw']) && $map['raw'] ? |
|
512
|
|
|
$skeleton['value'] : |
|
513
|
|
|
base64_encode($skeleton['value']); |
|
514
|
|
|
return $temp; |
|
515
|
|
|
} |
|
516
|
|
|
break; |
|
517
|
|
|
case ASN1::TYPE_INTEGER: |
|
518
|
|
|
$base = isset($map['base']) && (int)$map['base'] ? (int)$map['base'] : 10; |
|
519
|
|
|
if ($base < 3) { |
|
520
|
|
|
$result = $skeleton['value']; |
|
521
|
|
|
} else { |
|
522
|
|
|
if (strlen($skeleton['value']) > 53 && $base === 16) { |
|
523
|
|
|
$hex = ''; |
|
524
|
|
|
for ($i = strlen($skeleton['value']) - 4; $i >= 0; $i-=4) { |
|
525
|
|
|
$hex .= dechex((int)bindec(substr($skeleton['value'], $i, 4))); |
|
526
|
|
|
} |
|
527
|
|
|
$result = strrev($hex); |
|
528
|
|
|
} else { |
|
529
|
|
|
$temp = base_convert($skeleton['value'], 2, $base); |
|
530
|
|
|
if ($base === 10) { |
|
531
|
|
|
$temp = (int)$temp; |
|
532
|
|
|
} |
|
533
|
|
|
$result = $temp; |
|
534
|
|
|
} |
|
535
|
|
|
} |
|
536
|
|
|
if (isset($map['map']) && isset($map['map'][$result])) { |
|
537
|
|
|
$result = $map['map'][$result]; |
|
538
|
|
|
} |
|
539
|
|
|
return $result; |
|
540
|
|
|
case ASN1::TYPE_UTC_TIME: |
|
541
|
|
|
case ASN1::TYPE_GENERALIZED_TIME: |
|
542
|
|
|
return $skeleton['value']; |
|
543
|
|
|
default: |
|
544
|
|
|
$result = $skeleton['value']; |
|
545
|
|
|
if (isset($map['map']) && isset($map['map'][$result])) { |
|
546
|
|
|
$result = $map['map'][$result]; |
|
547
|
|
|
} |
|
548
|
|
|
return $result; |
|
549
|
|
|
} |
|
550
|
|
|
} |
|
551
|
|
|
} |
|
552
|
|
|
} |
|
553
|
|
|
|
vakata /
asn1
