Decoder::decodeOctetString() - Code Metrics - mlocati/ocsp - Measure and Improve Code Quality continuously with Scrutinizer

Decoder::decodeOctetString() A
last analyzed 2023-09-14 15:31 UTC

↳ Parent: Decoder

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	1
c	1
b	0
f	0
dl	0
loc	3
ccs	2
cts	2
cp	1
rs	10
cc	1
nc	1
nop	1
crap	1

<?php

namespace Ocsp\Asn1\Der;

use DateTimeImmutable;
use DateTimeZone;
use Ocsp\Asn1\Decoder as DecoderInterface;
use Ocsp\Asn1\Element;
use Ocsp\Asn1\Element\BitString;
use Ocsp\Asn1\Element\GeneralizedTime;
use Ocsp\Asn1\Element\Integer;
use Ocsp\Asn1\Element\ObjectIdentifier;
use Ocsp\Asn1\Element\OctetString;
use Ocsp\Asn1\Element\PrintableString;
use Ocsp\Asn1\Element\RawConstructed;
use Ocsp\Asn1\Element\RawPrimitive;
use Ocsp\Asn1\Element\Sequence;
use Ocsp\Asn1\Element\Set;
use Ocsp\Asn1\Tag;
use Ocsp\Asn1\TaggableElement;
use Ocsp\Asn1\UniversalTagID;
use Ocsp\Exception\Asn1DecodingException;
use Ocsp\Service\Math;

/**
 * Decoder from DER to ASN.1.
 */
class Decoder implements DecoderInterface
{
    /**
     * {@inheritdoc}
     *
     * @see \Ocsp\Asn1\Encoder::getEncodingHandle()
     */
    public function getEncodingHandle()
    {
        return 'der';
    }

    /**
     * {@inheritdoc}
     *
     * @see \Ocsp\Asn1\Decoder::decodeElement()
     */
    public function decodeElement($bytes)
    {
        $offset = 0;

        return $this->decodeElementAt($bytes, $offset);
    }

    /**
     * Decode an element at a specific position in a range of bytes.
     *
     * @param string $bytes
     * @param int $offset
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return \Ocsp\Asn1\Element
     */
    protected function decodeElementAt($bytes, &$offset)
    {
        list($typeID, $class, $isConstructed) = $this->decodeType($bytes, $offset);
        $encodedValue = $this->extractEncodedValue($bytes, $offset);

        return $isConstructed ? $this->decodeConstructed($typeID, $class, $encodedValue) : $this->decodePrimitive(/** @scrutinizer ignore-type */ $typeID, $class, $encodedValue);
    }

    /**
     * Decode a CONSTRUCTED ASN.1 element.
     *
     * @param int|\phpseclib\Math\BigInteger|\phpseclib3\Math\BigInteger $typeID
filter:
    dependency_paths: ["lib/*"]
     * @param string $class
     * @param string $encodedValue
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return \Ocsp\Asn1\Element
     */
    protected function decodeConstructed($typeID, $class, $encodedValue)
    {
        $offset = 0;
        $encodedValueLength = strlen($encodedValue);
        $elements = [];
        while ($offset < $encodedValueLength) {
            if ($encodedValue[$offset] === "\x00" && isset($encodedValue[$offset + 1]) && $encodedValue[$offset + 1] === "\x00") {
                // end of elements in case the length is in indefinite form
                break;
            }
            $elements[] = $this->decodeElementAt($encodedValue, $offset);
        }
        if (count($elements) === 1 && $class !== Element::CLASS_UNIVERSAL && $elements[0] instanceof TaggableElement) {
            return $elements[0]->setTag(Tag::explicit($typeID, $class));
        }
        if (is_int($typeID) && $class === Element::CLASS_UNIVERSAL) {
            switch ($typeID) {
                case UniversalTagID::SEQUENCE:
                    return Sequence::create($elements);
                case UniversalTagID::SET:
                    return Set::create($elements);
            }
        }

        return RawConstructed::create($this->getEncodingHandle(), $typeID, $class, $elements);
    }

    /**
     * Decode a PRIMITIVE ASN.1 element.
     *
     * @param int $typeID
     * @param string $class
     * @param string $encodedValue
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return \Ocsp\Asn1\Element
     */
    protected function decodePrimitive($typeID, $class, $encodedValue)
    {
        if ($class === Element::CLASS_UNIVERSAL) {
            switch ($typeID) {
                case UniversalTagID::INTEGER:
                    return Integer::create($this->decodeInteger($encodedValue));
                case UniversalTagID::BIT_STRING:
                    list($bytes, $numTrailingBits) = $this->decodeBitString($encodedValue);

                    return BitString::create($bytes, $numTrailingBits);
                case UniversalTagID::OCTET_STRING:
                    return OctetString::create($this->decodeOctetString($encodedValue));
                case UniversalTagID::OBJECT_IDENTIFIER:
                    return ObjectIdentifier::create($this->decodeObjectIdentifier($encodedValue));
                case UniversalTagID::PRINTABLESTRING:
                    return PrintableString::create($this->decodePrintableString($encodedValue));
                case UniversalTagID::GENERALIZEDTIME:
                    return GeneralizedTime::create($this->decodeGeneralizedTime($encodedValue));
            }
        }

        return RawPrimitive::create($this->getEncodingHandle(), $typeID, $class, $encodedValue);
    }

    /**
     * Extract the details about at a specific position in a range of bytes.
     *
     * @param string $bytes
     * @param int $offset
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return array The first element is the type ID (int|\phpseclib\Math\BigInteger|\phpseclib3\Math\BigInteger), the second is the class (string), the third is true (if the type is constructed) or false (not constructed)
     */
    protected function decodeType($bytes, &$offset)
    {
        if (!isset($bytes[$offset])) {
            throw Asn1DecodingException::create();
        }
        $byte = ord($bytes[$offset++]);
        $isConstructed = ($byte & 0b100000) !== 0;
        if (($byte & 0b11000000) === 0b11000000) {
            $class = Element::CLASS_PRIVATE;
        } elseif ($byte & 0b10000000) {
            $class = Element::CLASS_CONTEXTSPECIFIC;
        } elseif ($byte & 0b01000000) {
            $class = Element::CLASS_APPLICATION;
        } else {
            $class = Element::CLASS_UNIVERSAL;
        }
        $typeID = $byte & 0b00011111;
        if ($typeID === 0b00011111) {
            $typeParts = [];
            do {
                if (!isset($bytes[$offset])) {
                    throw Asn1DecodingException::create();
                }
                $byte = ord($bytes[$offset++]);
                $typeParts[] = $byte & 0b01111111;
            } while (($byte & 0b10000000) === 0);
            $numTypeParts = count($typeParts);
            if ($numTypeParts > PHP_INT_SIZE || ($numTypeParts === PHP_INT_SIZE && $typeParts[$numTypeParts - 1] & 0b10000000)) {
                $typeIDBits = '';
                for ($i = 0; $i < $numTypeParts; $i++) {
                    $typeIDBits .= str_pad(decbin($typeParts[$i]), 7, '0', STR_PAD_LEFT);
                }
                $typeID = Math::createBigInteger($typeIDBits, 2);
            } else {
                $typeID = 0;
                for ($i = $numTypeParts - 1; $i >= 0; $i--) {
                    $typeID = ($typeID << 7) + $typeParts[$i];
                }
            }
        }

        return [$typeID, $class, $isConstructed];
    }

    /**
     * Extract the bytes representing the value of an element.
     *
     * @param string $bytes
     * @param int $offset
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return string
     */
    protected function extractEncodedValue($bytes, &$offset)
    {
        $length = $this->decodeLength($bytes, $offset);
        if ($length === 0) {
            return '';
        }
        if ($offset + $length > strlen($bytes)) {
            throw Asn1DecodingException::create();
        }
        $encodedValue = substr($bytes, $offset, $length);
        $offset += $length;

        return $encodedValue;
    }

    /**
     * Extract the length (in bytes) of the encoded value an element.
     *
     * @param string $bytes
     * @param int $offset
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return int
     */
    protected function decodeLength($bytes, &$offset)
    {
        if (!isset($bytes[$offset])) {
            throw Asn1DecodingException::create();
        }
        $byte = ord($bytes[$offset++]);
        if (($byte & 0b10000000) === 0) {
            // short form
            return $byte;
        }
        if ($byte === 0b10000000) {
            // indefinite form
            return strlen($bytes) - $offset;
        }
        // technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
        // support it up to four.
        $numLenghtBytes = $byte & 0b01111111;
        if ($numLenghtBytes === 0) {
            throw Asn1DecodingException::create();
        }
        $length = 0;
        for ($i = 0; $i < $numLenghtBytes; $i++) {
            if (!isset($bytes[$offset])) {
                throw Asn1DecodingException::create();
            }
            $byte = ord($bytes[$offset++]);
            if ($i === PHP_INT_SIZE || ($i === PHP_INT_SIZE - 1 && $byte & 0b10000000)) {
                throw Asn1DecodingException::create('Element length too long for this implementation');
            }
            $length = ($length << 8) + $byte;
        }

        return $length;
    }

    /**
     * Decode the value of an INTEGER element.
     *
     * @param string $bytes
     *
     * @return int|\phpseclib\Math\BigInteger|\phpseclib3\Math\BigInteger
     */
    protected function decodeInteger($bytes)
    {
        $numBytes = strlen($bytes);
        $firstByte = ord($bytes[0]);
        $isNegative = ($firstByte & 0b10000000) !== 0;
        if ($isNegative === false) {
            switch ($numBytes) {
                case 1:
                    return $firstByte;
                case 2:
                    return current(unpack('n', $bytes));
                case 3:
                    return current(unpack('N', "\x00" . $bytes));
                case 4:
                    return current(unpack('N', $bytes));
            }
            if ($numBytes <= 8 && PHP_INT_SIZE >= 8 && PHP_VERSION_ID >= 50603) {
                return current(unpack('J', str_pad($bytes, 8, "\x00", STR_PAD_LEFT)));
            }
        }

        return Math::createBigInteger($bytes, -256);
    }

    /**
     * Decode the value of a BIT STRING element.
     *
     * @param string $bytes
     *
     * @return array The first element contains the bytes (a string), the second element the number of trailing bits (an integer)
     */
    protected function decodeBitString($bytes)
    {
        $numTrailingBits = ord($bytes[0]) & 0b01111111;
        $bytes = substr($bytes, 1);
        if ($bytes === false) {
            $bytes = '';
        }

        return [$bytes, $numTrailingBits];
    }

    /**
     * Decode the value of a OCTET STRING element.
     *
     * @param string $bytes
     *
     * @return string
     */
    protected function decodeOctetString($bytes)
    {
        return $bytes;
    }

    /**
     * Decode the value of a OBJECT IDENTIFIER element.
     *
     * @param string $bytes
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return string
     */
    protected function decodeObjectIdentifier($bytes)
    {
        $byte = ord($bytes[0]);
        $result = sprintf('%d.%d', floor($byte / 40), $byte % 40);
        $len = strlen($bytes);
        $chunkBits = '';
        $maxIntBits = PHP_INT_SIZE * 8 - 1;
        for ($offset = 1; $offset < $len; $offset++) {
            $byte = ord($bytes[$offset]);
            $chunkBits .= str_pad(decbin($byte & 0b01111111), 7, '0', STR_PAD_LEFT);
            if (($byte & 0b10000000) === 0) {
                $result .= '.';
                if (strlen($chunkBits) <= $maxIntBits) {
                    $result .= (string) bindec($chunkBits);
                } else {
                    $result .= Math::createBigInteger($chunkBits, 2)->toString();
                }
                $chunkBits = '';
            }
        }
        if ($chunkBits !== '') {
            throw Asn1DecodingException::create();
        }

        return $result;
    }

    /**
     * Decode the value of a PrintableString element.
     *
     * @param string $bytes
     *
     * @return string
     */
    protected function decodePrintableString($bytes)
    {
        return $bytes;
    }

    /**
     * Decode the value of a GeneralizedTime element.
     *
     * @param string $bytes
     *
     * @throws \Ocsp\Exception\Asn1DecodingException
     *
     * @return \DateTimeImmutable
     */
    protected function decodeGeneralizedTime($bytes)
    {
        $matches = null;
        if (!preg_match('/(\d{4}\d{2}\d{2}\d{2}\d{2}\d{2})(?:\.(\d*))?Z$/', $bytes, $matches)) {
            throw Asn1DecodingException::create();
        }
        $dateTime = DateTimeImmutable::createFromFormat('!YmdHis.uT', $matches[1] . '.' . (isset($matches[2]) ? $matches[2] : '0') . 'UTC', new DateTimeZone('UTC'));
        $result = $dateTime->setTimezone(new DateTimeZone(date_default_timezone_get()));

        return $result;
    }
}


1		<?php
2
3		namespace Ocsp\Asn1\Der;
4
5		use DateTimeImmutable;
6		use DateTimeZone;
7		use Ocsp\Asn1\Decoder as DecoderInterface;
8		use Ocsp\Asn1\Element;
9		use Ocsp\Asn1\Element\BitString;
10		use Ocsp\Asn1\Element\GeneralizedTime;
11		use Ocsp\Asn1\Element\Integer;
12		use Ocsp\Asn1\Element\ObjectIdentifier;
13		use Ocsp\Asn1\Element\OctetString;
14		use Ocsp\Asn1\Element\PrintableString;
15		use Ocsp\Asn1\Element\RawConstructed;
16		use Ocsp\Asn1\Element\RawPrimitive;
17		use Ocsp\Asn1\Element\Sequence;
18		use Ocsp\Asn1\Element\Set;
19		use Ocsp\Asn1\Tag;
20		use Ocsp\Asn1\TaggableElement;
21		use Ocsp\Asn1\UniversalTagID;
22		use Ocsp\Exception\Asn1DecodingException;
23		use Ocsp\Service\Math;
24
25		/**
26		* Decoder from DER to ASN.1.
27		*/
28		class Decoder implements DecoderInterface
29		{
30		/**
31		* {@inheritdoc}
32		*
33		* @see \Ocsp\Asn1\Encoder::getEncodingHandle()
34		*/
35	3	public function getEncodingHandle()
36		{
37	3	return 'der';
38		}
39
40		/**
41		* {@inheritdoc}
42		*
43		* @see \Ocsp\Asn1\Decoder::decodeElement()
44		*/
45	3	public function decodeElement($bytes)
46		{
47	3	$offset = 0;
48
49	3	return $this->decodeElementAt($bytes, $offset);
50		}
51
52		/**
53		* Decode an element at a specific position in a range of bytes.
54		*
55		* @param string $bytes
56		* @param int $offset
57		*
58		* @throws \Ocsp\Exception\Asn1DecodingException
59		*
60		* @return \Ocsp\Asn1\Element
61		*/
62	3	protected function decodeElementAt($bytes, &$offset)
63		{
64	3	list($typeID, $class, $isConstructed) = $this->decodeType($bytes, $offset);
65	3	$encodedValue = $this->extractEncodedValue($bytes, $offset);
66
67	3	return $isConstructed ? $this->decodeConstructed($typeID, $class, $encodedValue) : $this->decodePrimitive(/** @scrutinizer ignore-type */ $typeID, $class, $encodedValue);
68		}
69
70		/**
71		* Decode a CONSTRUCTED ASN.1 element.
72		*
73		* @param int\|\phpseclib\Math\BigInteger\|\phpseclib3\Math\BigInteger $typeID
		0 ignored issues – show Bug introduced 2023-01-16 15:58 UTC by Report Bug Copy Issue Report The type `phpseclib\Math\BigInteger` was not found. Maybe you did not declare it correctly or list all dependencies? The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g. `excluded_paths: ["lib/"]`, you can move it to the dependency path list as follows: filter: dependency_paths: ["lib/"] For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths Loading history...
74		* @param string $class
75		* @param string $encodedValue
76		*
77		* @throws \Ocsp\Exception\Asn1DecodingException
78		*
79		* @return \Ocsp\Asn1\Element
80		*/
81	3	protected function decodeConstructed($typeID, $class, $encodedValue)
82		{
83	3	$offset = 0;
84	3	$encodedValueLength = strlen($encodedValue);
85	3	$elements = [];
86	3	while ($offset < $encodedValueLength) {
87	3	if ($encodedValue[$offset] === "\x00" && isset($encodedValue[$offset + 1]) && $encodedValue[$offset + 1] === "\x00") {
88		// end of elements in case the length is in indefinite form
89		break;
90		}
91	3	$elements[] = $this->decodeElementAt($encodedValue, $offset);
92		}
93	3	if (count($elements) === 1 && $class !== Element::CLASS_UNIVERSAL && $elements[0] instanceof TaggableElement) {
94	3	return $elements[0]->setTag(Tag::explicit($typeID, $class));
95		}
96	3	if (is_int($typeID) && $class === Element::CLASS_UNIVERSAL) {
97		switch ($typeID) {
98	3	case UniversalTagID::SEQUENCE:
99	3	return Sequence::create($elements);
100	3	case UniversalTagID::SET:
101	3	return Set::create($elements);
102		}
103		}
104
105		return RawConstructed::create($this->getEncodingHandle(), $typeID, $class, $elements);
106		}
107
108		/**
109		* Decode a PRIMITIVE ASN.1 element.
110		*
111		* @param int $typeID
112		* @param string $class
113		* @param string $encodedValue
114		*
115		* @throws \Ocsp\Exception\Asn1DecodingException
116		*
117		* @return \Ocsp\Asn1\Element
118		*/
119	3	protected function decodePrimitive($typeID, $class, $encodedValue)
120		{
121	3	if ($class === Element::CLASS_UNIVERSAL) {
122		switch ($typeID) {
123	3	case UniversalTagID::INTEGER:
124	3	return Integer::create($this->decodeInteger($encodedValue));
125	3	case UniversalTagID::BIT_STRING:
126	3	list($bytes, $numTrailingBits) = $this->decodeBitString($encodedValue);
127
128	3	return BitString::create($bytes, $numTrailingBits);
129	3	case UniversalTagID::OCTET_STRING:
130	3	return OctetString::create($this->decodeOctetString($encodedValue));
131	3	case UniversalTagID::OBJECT_IDENTIFIER:
132	3	return ObjectIdentifier::create($this->decodeObjectIdentifier($encodedValue));
133	3	case UniversalTagID::PRINTABLESTRING:
134	3	return PrintableString::create($this->decodePrintableString($encodedValue));
135	3	case UniversalTagID::GENERALIZEDTIME:
136	2	return GeneralizedTime::create($this->decodeGeneralizedTime($encodedValue));
137		}
138		}
139
140	3	return RawPrimitive::create($this->getEncodingHandle(), $typeID, $class, $encodedValue);
141		}
142
143		/**
144		* Extract the details about at a specific position in a range of bytes.
145		*
146		* @param string $bytes
147		* @param int $offset
148		*
149		* @throws \Ocsp\Exception\Asn1DecodingException
150		*
151		* @return array The first element is the type ID (int\|\phpseclib\Math\BigInteger\|\phpseclib3\Math\BigInteger), the second is the class (string), the third is true (if the type is constructed) or false (not constructed)
152		*/
153	3	protected function decodeType($bytes, &$offset)
154		{
155	3	if (!isset($bytes[$offset])) {
156		throw Asn1DecodingException::create();
157		}
158	3	$byte = ord($bytes[$offset++]);
159	3	$isConstructed = ($byte & 0b100000) !== 0;
160	3	if (($byte & 0b11000000) === 0b11000000) {
161		$class = Element::CLASS_PRIVATE;
162	3	} elseif ($byte & 0b10000000) {
163	3	$class = Element::CLASS_CONTEXTSPECIFIC;
164	3	} elseif ($byte & 0b01000000) {
165		$class = Element::CLASS_APPLICATION;
166		} else {
167	3	$class = Element::CLASS_UNIVERSAL;
168		}
169	3	$typeID = $byte & 0b00011111;
170	3	if ($typeID === 0b00011111) {
171		$typeParts = [];
172		do {
173		if (!isset($bytes[$offset])) {
174		throw Asn1DecodingException::create();
175		}
176		$byte = ord($bytes[$offset++]);
177		$typeParts[] = $byte & 0b01111111;
178		} while (($byte & 0b10000000) === 0);
179		$numTypeParts = count($typeParts);
180		if ($numTypeParts > PHP_INT_SIZE \|\| ($numTypeParts === PHP_INT_SIZE && $typeParts[$numTypeParts - 1] & 0b10000000)) {
181		$typeIDBits = '';
182		for ($i = 0; $i < $numTypeParts; $i++) {
183		$typeIDBits .= str_pad(decbin($typeParts[$i]), 7, '0', STR_PAD_LEFT);
184		}
185		$typeID = Math::createBigInteger($typeIDBits, 2);
186		} else {
187		$typeID = 0;
188		for ($i = $numTypeParts - 1; $i >= 0; $i--) {
189		$typeID = ($typeID << 7) + $typeParts[$i];
190		}
191		}
192		}
193
194	3	return [$typeID, $class, $isConstructed];
195		}
196
197		/**
198		* Extract the bytes representing the value of an element.
199		*
200		* @param string $bytes
201		* @param int $offset
202		*
203		* @throws \Ocsp\Exception\Asn1DecodingException
204		*
205		* @return string
206		*/
207	3	protected function extractEncodedValue($bytes, &$offset)
208		{
209	3	$length = $this->decodeLength($bytes, $offset);
210	3	if ($length === 0) {
211	3	return '';
212		}
213	3	if ($offset + $length > strlen($bytes)) {
214		throw Asn1DecodingException::create();
215		}
216	3	$encodedValue = substr($bytes, $offset, $length);
217	3	$offset += $length;
218
219	3	return $encodedValue;
220		}
221
222		/**
223		* Extract the length (in bytes) of the encoded value an element.
224		*
225		* @param string $bytes
226		* @param int $offset
227		*
228		* @throws \Ocsp\Exception\Asn1DecodingException
229		*
230		* @return int
231		*/
232	3	protected function decodeLength($bytes, &$offset)
233		{
234	3	if (!isset($bytes[$offset])) {
235		throw Asn1DecodingException::create();
236		}
237	3	$byte = ord($bytes[$offset++]);
238	3	if (($byte & 0b10000000) === 0) {
239		// short form
240	3	return $byte;
241		}
242	3	if ($byte === 0b10000000) {
243		// indefinite form
244		return strlen($bytes) - $offset;
245		}
246		// technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
247		// support it up to four.
248	3	$numLenghtBytes = $byte & 0b01111111;
249	3	if ($numLenghtBytes === 0) {
250		throw Asn1DecodingException::create();
251		}
252	3	$length = 0;
253	3	for ($i = 0; $i < $numLenghtBytes; $i++) {
254	3	if (!isset($bytes[$offset])) {
255		throw Asn1DecodingException::create();
256		}
257	3	$byte = ord($bytes[$offset++]);
258	3	if ($i === PHP_INT_SIZE \|\| ($i === PHP_INT_SIZE - 1 && $byte & 0b10000000)) {
259		throw Asn1DecodingException::create('Element length too long for this implementation');
260		}
261	3	$length = ($length << 8) + $byte;
262		}
263
264	3	return $length;
265		}
266
267		/**
268		* Decode the value of an INTEGER element.
269		*
270		* @param string $bytes
271		*
272		* @return int\|\phpseclib\Math\BigInteger\|\phpseclib3\Math\BigInteger
273		*/
274	3	protected function decodeInteger($bytes)
275		{
276	3	$numBytes = strlen($bytes);
277	3	$firstByte = ord($bytes[0]);
278	3	$isNegative = ($firstByte & 0b10000000) !== 0;
279	3	if ($isNegative === false) {
280		switch ($numBytes) {
281	3	case 1:
282	3	return $firstByte;
283	3	case 2:
284		return current(unpack('n', $bytes));
285	3	case 3:
286		return current(unpack('N', "\x00" . $bytes));
287	3	case 4:
288		return current(unpack('N', $bytes));
289		}
290	3	if ($numBytes <= 8 && PHP_INT_SIZE >= 8 && PHP_VERSION_ID >= 50603) {
291		return current(unpack('J', str_pad($bytes, 8, "\x00", STR_PAD_LEFT)));
292		}
293		}
294
295	3	return Math::createBigInteger($bytes, -256);
296		}
297
298		/**
299		* Decode the value of a BIT STRING element.
300		*
301		* @param string $bytes
302		*
303		* @return array The first element contains the bytes (a string), the second element the number of trailing bits (an integer)
304		*/
305	3	protected function decodeBitString($bytes)
306		{
307	3	$numTrailingBits = ord($bytes[0]) & 0b01111111;
308	3	$bytes = substr($bytes, 1);
309	3	if ($bytes === false) {
310		$bytes = '';
311		}
312
313	3	return [$bytes, $numTrailingBits];
314		}
315
316		/**
317		* Decode the value of a OCTET STRING element.
318		*
319		* @param string $bytes
320		*
321		* @return string
322		*/
323	3	protected function decodeOctetString($bytes)
324		{
325	3	return $bytes;
326		}
327
328		/**
329		* Decode the value of a OBJECT IDENTIFIER element.
330		*
331		* @param string $bytes
332		*
333		* @throws \Ocsp\Exception\Asn1DecodingException
334		*
335		* @return string
336		*/
337	3	protected function decodeObjectIdentifier($bytes)
338		{
339	3	$byte = ord($bytes[0]);
340	3	$result = sprintf('%d.%d', floor($byte / 40), $byte % 40);
341	3	$len = strlen($bytes);
342	3	$chunkBits = '';
343	3	$maxIntBits = PHP_INT_SIZE * 8 - 1;
344	3	for ($offset = 1; $offset < $len; $offset++) {
345	3	$byte = ord($bytes[$offset]);
346	3	$chunkBits .= str_pad(decbin($byte & 0b01111111), 7, '0', STR_PAD_LEFT);
347	3	if (($byte & 0b10000000) === 0) {
348	3	$result .= '.';
349	3	if (strlen($chunkBits) <= $maxIntBits) {
350	3	$result .= (string) bindec($chunkBits);
351		} else {
352		$result .= Math::createBigInteger($chunkBits, 2)->toString();
353		}
354	3	$chunkBits = '';
355		}
356		}
357	3	if ($chunkBits !== '') {
358		throw Asn1DecodingException::create();
359		}
360
361	3	return $result;
362		}
363
364		/**
365		* Decode the value of a PrintableString element.
366		*
367		* @param string $bytes
368		*
369		* @return string
370		*/
371	3	protected function decodePrintableString($bytes)
372		{
373	3	return $bytes;
374		}
375
376		/**
377		* Decode the value of a GeneralizedTime element.
378		*
379		* @param string $bytes
380		*
381		* @throws \Ocsp\Exception\Asn1DecodingException
382		*
383		* @return \DateTimeImmutable
384		*/
385	2	protected function decodeGeneralizedTime($bytes)
386		{
387	2	$matches = null;
388	2	if (!preg_match('/(\d{4}\d{2}\d{2}\d{2}\d{2}\d{2})(?:\.(\d*))?Z$/', $bytes, $matches)) {
389		throw Asn1DecodingException::create();
390		}
391	2	$dateTime = DateTimeImmutable::createFromFormat('!YmdHis.uT', $matches[1] . '.' . (isset($matches[2]) ? $matches[2] : '0') . 'UTC', new DateTimeZone('UTC'));
392	2	$result = $dateTime->setTimezone(new DateTimeZone(date_default_timezone_get()));
393
394	2	return $result;
395		}
396		}
397

mlocati / ocsp

Decoder::decodeOctetString() A last analyzed 2023-09-14 15:31 UTC

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Decoder::decodeOctetString() A
last analyzed 2023-09-14 15:31 UTC