ECKey::loadPEM() - Code Metrics - Inspection of "Private keys from APN support" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

Pull Request — master (#146)

by Florent

created 2016-10-18 11:24 UTC

ECKey::loadPEM() B

↳ Parent: ECKey

Complexity

Conditions	4
Paths	4

Size

Total Lines	24
Code Lines	18

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	24
rs	8.6845
c	0
b	0
f	0
cc	4
eloc	18
nc	4
nop	1

<?php

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose\KeyConverter;

use Assert\Assertion;
use Base64Url\Base64Url;
use FG\ASN1\ExplicitlyTaggedObject;
use FG\ASN1\Object;
use FG\ASN1\Universal\BitString;
use FG\ASN1\Universal\Integer;
use FG\ASN1\Universal\ObjectIdentifier;
use FG\ASN1\Universal\OctetString;
use FG\ASN1\Universal\Sequence;
use Jose\Object\JWKInterface;

final class ECKey extends Sequence
{
    /**
     * @var bool
     */
    private $private = false;

    /**
     * @var array
     */
    private $values = [];

    /**
     * @param \Jose\Object\JWKInterface|string|array $data
     */
    public function __construct($data)
    {
        parent::__construct();

        if ($data instanceof JWKInterface) {
            $this->loadJWK($data->getAll());
        } elseif (is_array($data)) {
            $this->loadJWK($data);
        } elseif (is_string($data)) {
            $this->loadPEM($data);
        } else {
            throw new \InvalidArgumentException('Unsupported input');
        }
        $this->private = isset($this->values['d']);
    }

    /**
     * @param string $data
     *
     * @throws \Exception
     * @throws \FG\ASN1\Exception\ParserException
     *
     * @return array
     */
    private function loadPEM($data)
    {
        $data = base64_decode(preg_replace('#-.*-|\r|\n#', '', $data));
        $asnObject = Object::fromBinary($data);

        Assertion::isInstanceOf($asnObject, Sequence::class);

        $children = $asnObject->getChildren();
class A
{
    public function foo() { }
}

class B extends A
{
    public function bar() { }
}

/**
 * @param A|B $x
 */
function someFunction($x)
{
    $x->foo(); // This call is fine as the method exists in A and B.
    $x->bar(); // This method only exists in B and might cause an error.
}
        if (4 === count($children)) {
            return $this->loadPrivatePEM($children);
        } elseif (3 === count($children)) {
            Assertion::isInstanceOf($children[1], Sequence::class);
            $binary = hex2bin($children[2]->getContent());
            $asnObject = Object::fromBinary($binary);
            Assertion::isInstanceOf($asnObject, Sequence::class);
            $children = $asnObject->getChildren();
            Assertion::eq(4, count($children), 'Unable to load the key');

            return $this->loadPrivatePEM($children);
        } elseif (2 === count($children)) {
            return $this->loadPublicPEM($children);
        }
        throw new \Exception('Unable to load the key');
    }

    /**
     * @param array $jwk
     */
    private function loadJWK(array $jwk)
    {
        Assertion::true(array_key_exists('kty', $jwk), 'JWK is not an Elliptic Curve key');
        Assertion::eq($jwk['kty'], 'EC', 'JWK is not an Elliptic Curve key');
        Assertion::true(array_key_exists('crv', $jwk), 'Curve parameter is missing');
        Assertion::true(array_key_exists('x', $jwk), 'Point parameters are missing');
        Assertion::true(array_key_exists('y', $jwk), 'Point parameters are missing');

        $this->values = $jwk;
        if (array_key_exists('d', $jwk)) {
            $this->initPrivateKey();
        } else {
            $this->initPublicKey();
        }
    }

    private function initPublicKey()
    {
        $oid_sequence = new Sequence();
        $oid_sequence->addChild(new ObjectIdentifier('1.2.840.10045.2.1'));
        $oid_sequence->addChild(new ObjectIdentifier($this->getOID($this->values['crv'])));
        $this->addChild($oid_sequence);

        $bits = '04';
        $bits .= bin2hex(Base64Url::decode($this->values['x']));
        $bits .= bin2hex(Base64Url::decode($this->values['y']));
        $this->addChild(new BitString($bits));
    }

    private function initPrivateKey()
    {
        $this->addChild(new Integer(1));
        $this->addChild(new OctetString(bin2hex(Base64Url::decode($this->values['d']))));

        $oid = new ObjectIdentifier($this->getOID($this->values['crv']));
        $this->addChild(new ExplicitlyTaggedObject(0, $oid));

        $bits = '04';
        $bits .= bin2hex(Base64Url::decode($this->values['x']));
        $bits .= bin2hex(Base64Url::decode($this->values['y']));
        $bit = new BitString($bits);
        $this->addChild(new ExplicitlyTaggedObject(1, $bit));
    }

    /**
     * @param array $children
     *
     * @throws \Exception
     *
     * @return array
     */
    private function loadPublicPEM(array $children)
    {
        Assertion::isInstanceOf($children[0], Sequence::class, 'Unsupported key type');

        $sub = $children[0]->getChildren();
        Assertion::isInstanceOf($sub[0], ObjectIdentifier::class, 'Unsupported key type');
        Assertion::eq('1.2.840.10045.2.1', $sub[0]->getContent(), 'Unsupported key type');

        Assertion::isInstanceOf($sub[1], ObjectIdentifier::class, 'Unsupported key type');
        Assertion::isInstanceOf($children[1], BitString::class, 'Unable to load the key');

        $bits = $children[1]->getContent();
        $bits_length = mb_strlen($bits, '8bit');

        Assertion::eq('04', mb_substr($bits, 0, 2, '8bit'), 'Unsupported key type');

        $this->values['kty'] = 'EC';
        $this->values['crv'] = $this->getCurve($sub[1]->getContent());
        $this->values['x'] = Base64Url::encode(hex2bin(mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit')));
        $this->values['y'] = Base64Url::encode(hex2bin(mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit')));
    }

    /**
     * @param \FG\ASN1\Object $children
     */
    private function verifyVersion(Object $children)
    {
        Assertion::isInstanceOf($children, Integer::class, 'Unable to load the key');
        Assertion::eq(1, $children->getContent(), 'Unable to load the key');
    }

    /**
     * @param \FG\ASN1\Object $children
     * @param string|null     $x
     * @param string|null     $y
     */
    private function getXAndY(Object $children, &$x, &$y)
    {
        Assertion::isInstanceOf($children, ExplicitlyTaggedObject::class, 'Unable to load the key');
        Assertion::isArray($children->getContent(), 'Unable to load the key');
        Assertion::isInstanceOf($children->getContent()[0], BitString::class, 'Unable to load the key');

        $bits = $children->getContent()[0]->getContent();
        $bits_length = mb_strlen($bits, '8bit');

        Assertion::eq('04', mb_substr($bits, 0, 2, '8bit'), 'Unsupported key type');

        $x = mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit');
        $y = mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit');
    }

    /**
     * @param \FG\ASN1\Object $children
     *
     * @return string
     */
    private function getD(Object $children)
    {
        Assertion::isInstanceOf($children, '\FG\ASN1\Universal\OctetString', 'Unable to load the key');

        return $children->getContent();
    }

    /**
     * @param array $children
     *
     * @return array
     */
    private function loadPrivatePEM(array $children)
    {
        $this->verifyVersion($children[0]);
        $x = null;
        $y = null;
        $d = $this->getD($children[1]);
        $this->getXAndY($children[3], $x, $y);

        Assertion::isInstanceOf($children[2], ExplicitlyTaggedObject::class, 'Unable to load the key');
        Assertion::isArray($children[2]->getContent(), 'Unable to load the key');
        Assertion::isInstanceOf($children[2]->getContent()[0], ObjectIdentifier::class, 'Unable to load the key');

        $curve = $children[2]->getContent()[0]->getContent();

        $this->private = true;
        $this->values['kty'] = 'EC';
        $this->values['crv'] = $this->getCurve($curve);
        $this->values['d'] = Base64Url::encode(hex2bin($d));
        $this->values['x'] = Base64Url::encode(hex2bin($x));
        $this->values['y'] = Base64Url::encode(hex2bin($y));
    }

    /**
     * @return bool
     */
    public function isPrivate()
    {
        return $this->private;
    }

    /**
     * @param \Jose\KeyConverter\ECKey $private
     *
     * @return \Jose\KeyConverter\ECKey
     */
    public static function toPublic(ECKey $private)
    {
        $data = $private->toArray();
        if (array_key_exists('d', $data)) {
            unset($data['d']);
        }

        return new self($data);
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->toPEM();
    }

    /**
     * @return array
     */
    public function toArray()
    {
        return $this->values;
    }

    /**
     * @return string
     */
    public function toDER()
    {
        return $this->getBinary();
    }

    /**
     * @return string
     */
    public function toPEM()
    {
        $result = '-----BEGIN '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL;
        $result .= chunk_split(base64_encode($this->getBinary()), 64, PHP_EOL);
        $result .= '-----END '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL;

        return $result;
    }

    /**
     * @param $curve
     *
     * @return string
     */
    private function getOID($curve)
    {
        $curves = $this->getSupportedCurves();
        $oid = array_key_exists($curve, $curves) ? $curves[$curve] : null;

        Assertion::notNull($oid, 'Unsupported curve');

        return $oid;
    }

    /**
     * @param string $oid
     *
     * @return string
     */
    private function getCurve($oid)
    {
        $curves = $this->getSupportedCurves();
        $curve = array_search($oid, $curves, true);
        Assertion::string($curve, 'Unsupported OID');

        return $curve;
    }

    /**
     * @return array
     */
    private function getSupportedCurves()
    {
        return [
            'P-256' => '1.2.840.10045.3.1.7',
            'P-384' => '1.3.132.0.34',
            'P-521' => '1.3.132.0.35',
        ];
    }
}


1			<?php
2
3			/*
4			* The MIT License (MIT)
5			*
6			* Copyright (c) 2014-2016 Spomky-Labs
7			*
8			* This software may be modified and distributed under the terms
9			* of the MIT license. See the LICENSE file for details.
10			*/
11
12			namespace Jose\KeyConverter;
13
14			use Assert\Assertion;
15			use Base64Url\Base64Url;
16			use FG\ASN1\ExplicitlyTaggedObject;
17			use FG\ASN1\Object;
18			use FG\ASN1\Universal\BitString;
19			use FG\ASN1\Universal\Integer;
20			use FG\ASN1\Universal\ObjectIdentifier;
21			use FG\ASN1\Universal\OctetString;
22			use FG\ASN1\Universal\Sequence;
23			use Jose\Object\JWKInterface;
24
25			final class ECKey extends Sequence
26			{
27			/**
28			* @var bool
29			*/
30			private $private = false;
31
32			/**
33			* @var array
34			*/
35			private $values = [];
36
37			/**
38			* @param \Jose\Object\JWKInterface\|string\|array $data
39			*/
40			public function __construct($data)
41			{
42			parent::__construct();
43
44			if ($data instanceof JWKInterface) {
45			$this->loadJWK($data->getAll());
46			} elseif (is_array($data)) {
47			$this->loadJWK($data);
48			} elseif (is_string($data)) {
49			$this->loadPEM($data);
50			} else {
51			throw new \InvalidArgumentException('Unsupported input');
52			}
53			$this->private = isset($this->values['d']);
54			}
55
56			/**
57			* @param string $data
58			*
59			* @throws \Exception
60			* @throws \FG\ASN1\Exception\ParserException
61			*
62			* @return array
63			*/
64			private function loadPEM($data)
65			{
66			$data = base64_decode(preg_replace('#-.*-\|\r\|\n#', '', $data));
67			$asnObject = Object::fromBinary($data);
68
69			Assertion::isInstanceOf($asnObject, Sequence::class);
70
71			$children = $asnObject->getChildren();
			0 ignored issues – show Bug introduced 2016-02-28 12:53 UTC by Report Bug Copy Issue Report The method `getChildren` does only exist in `FG\ASN1\Construct`, but not in `FG\ASN1\AbstractString a...d FG\ASN1\UnknownObject`. It seems like the method you are trying to call exists only in some of the possible types. Let’s take a look at an example: class A { public function foo() { } } class B extends A { public function bar() { } } /** * @param A\|B $x / function someFunction($x) { $x->foo(); // This call is fine as the method exists in A and B. $x->bar(); // This method only exists in B and might cause an error. } Available Fixes Add an additional type-check: /* * @param A\|B $x / function someFunction($x) { $x->foo(); if ($x instanceof B) { $x->bar(); } } Only allow a single type to be passed if the variable comes from a parameter: function someFunction(B $x) { /* ... */ } Loading history...
72			if (4 === count($children)) {
73			return $this->loadPrivatePEM($children);
74			} elseif (3 === count($children)) {
75			Assertion::isInstanceOf($children[1], Sequence::class);
76			$binary = hex2bin($children[2]->getContent());
77			$asnObject = Object::fromBinary($binary);
78			Assertion::isInstanceOf($asnObject, Sequence::class);
79			$children = $asnObject->getChildren();
80			Assertion::eq(4, count($children), 'Unable to load the key');
81
82			return $this->loadPrivatePEM($children);
83			} elseif (2 === count($children)) {
84			return $this->loadPublicPEM($children);
85			}
86			throw new \Exception('Unable to load the key');
87			}
88
89			/**
90			* @param array $jwk
91			*/
92			private function loadJWK(array $jwk)
93			{
94			Assertion::true(array_key_exists('kty', $jwk), 'JWK is not an Elliptic Curve key');
95			Assertion::eq($jwk['kty'], 'EC', 'JWK is not an Elliptic Curve key');
96			Assertion::true(array_key_exists('crv', $jwk), 'Curve parameter is missing');
97			Assertion::true(array_key_exists('x', $jwk), 'Point parameters are missing');
98			Assertion::true(array_key_exists('y', $jwk), 'Point parameters are missing');
99
100			$this->values = $jwk;
101			if (array_key_exists('d', $jwk)) {
102			$this->initPrivateKey();
103			} else {
104			$this->initPublicKey();
105			}
106			}
107
108			private function initPublicKey()
109			{
110			$oid_sequence = new Sequence();
111			$oid_sequence->addChild(new ObjectIdentifier('1.2.840.10045.2.1'));
112			$oid_sequence->addChild(new ObjectIdentifier($this->getOID($this->values['crv'])));
113			$this->addChild($oid_sequence);
114
115			$bits = '04';
116			$bits .= bin2hex(Base64Url::decode($this->values['x']));
117			$bits .= bin2hex(Base64Url::decode($this->values['y']));
118			$this->addChild(new BitString($bits));
119			}
120
121			private function initPrivateKey()
122			{
123			$this->addChild(new Integer(1));
124			$this->addChild(new OctetString(bin2hex(Base64Url::decode($this->values['d']))));
125
126			$oid = new ObjectIdentifier($this->getOID($this->values['crv']));
127			$this->addChild(new ExplicitlyTaggedObject(0, $oid));
128
129			$bits = '04';
130			$bits .= bin2hex(Base64Url::decode($this->values['x']));
131			$bits .= bin2hex(Base64Url::decode($this->values['y']));
132			$bit = new BitString($bits);
133			$this->addChild(new ExplicitlyTaggedObject(1, $bit));
134			}
135
136			/**
137			* @param array $children
138			*
139			* @throws \Exception
140			*
141			* @return array
142			*/
143			private function loadPublicPEM(array $children)
144			{
145			Assertion::isInstanceOf($children[0], Sequence::class, 'Unsupported key type');
146
147			$sub = $children[0]->getChildren();
148			Assertion::isInstanceOf($sub[0], ObjectIdentifier::class, 'Unsupported key type');
149			Assertion::eq('1.2.840.10045.2.1', $sub[0]->getContent(), 'Unsupported key type');
150
151			Assertion::isInstanceOf($sub[1], ObjectIdentifier::class, 'Unsupported key type');
152			Assertion::isInstanceOf($children[1], BitString::class, 'Unable to load the key');
153
154			$bits = $children[1]->getContent();
155			$bits_length = mb_strlen($bits, '8bit');
156
157			Assertion::eq('04', mb_substr($bits, 0, 2, '8bit'), 'Unsupported key type');
158
159			$this->values['kty'] = 'EC';
160			$this->values['crv'] = $this->getCurve($sub[1]->getContent());
161			$this->values['x'] = Base64Url::encode(hex2bin(mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit')));
162			$this->values['y'] = Base64Url::encode(hex2bin(mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit')));
163			}
164
165			/**
166			* @param \FG\ASN1\Object $children
167			*/
168			private function verifyVersion(Object $children)
169			{
170			Assertion::isInstanceOf($children, Integer::class, 'Unable to load the key');
171			Assertion::eq(1, $children->getContent(), 'Unable to load the key');
172			}
173
174			/**
175			* @param \FG\ASN1\Object $children
176			* @param string\|null $x
177			* @param string\|null $y
178			*/
179			private function getXAndY(Object $children, &$x, &$y)
180			{
181			Assertion::isInstanceOf($children, ExplicitlyTaggedObject::class, 'Unable to load the key');
182			Assertion::isArray($children->getContent(), 'Unable to load the key');
183			Assertion::isInstanceOf($children->getContent()[0], BitString::class, 'Unable to load the key');
184
185			$bits = $children->getContent()[0]->getContent();
186			$bits_length = mb_strlen($bits, '8bit');
187
188			Assertion::eq('04', mb_substr($bits, 0, 2, '8bit'), 'Unsupported key type');
189
190			$x = mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit');
191			$y = mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit');
192			}
193
194			/**
195			* @param \FG\ASN1\Object $children
196			*
197			* @return string
198			*/
199			private function getD(Object $children)
200			{
201			Assertion::isInstanceOf($children, '\FG\ASN1\Universal\OctetString', 'Unable to load the key');
202
203			return $children->getContent();
204			}
205
206			/**
207			* @param array $children
208			*
209			* @return array
210			*/
211			private function loadPrivatePEM(array $children)
212			{
213			$this->verifyVersion($children[0]);
214			$x = null;
215			$y = null;
216			$d = $this->getD($children[1]);
217			$this->getXAndY($children[3], $x, $y);
218
219			Assertion::isInstanceOf($children[2], ExplicitlyTaggedObject::class, 'Unable to load the key');
220			Assertion::isArray($children[2]->getContent(), 'Unable to load the key');
221			Assertion::isInstanceOf($children[2]->getContent()[0], ObjectIdentifier::class, 'Unable to load the key');
222
223			$curve = $children[2]->getContent()[0]->getContent();
224
225			$this->private = true;
226			$this->values['kty'] = 'EC';
227			$this->values['crv'] = $this->getCurve($curve);
228			$this->values['d'] = Base64Url::encode(hex2bin($d));
229			$this->values['x'] = Base64Url::encode(hex2bin($x));
230			$this->values['y'] = Base64Url::encode(hex2bin($y));
231			}
232
233			/**
234			* @return bool
235			*/
236			public function isPrivate()
237			{
238			return $this->private;
239			}
240
241			/**
242			* @param \Jose\KeyConverter\ECKey $private
243			*
244			* @return \Jose\KeyConverter\ECKey
245			*/
246			public static function toPublic(ECKey $private)
247			{
248			$data = $private->toArray();
249			if (array_key_exists('d', $data)) {
250			unset($data['d']);
251			}
252
253			return new self($data);
254			}
255
256			/**
257			* @return string
258			*/
259			public function __toString()
260			{
261			return $this->toPEM();
262			}
263
264			/**
265			* @return array
266			*/
267			public function toArray()
268			{
269			return $this->values;
270			}
271
272			/**
273			* @return string
274			*/
275			public function toDER()
276			{
277			return $this->getBinary();
278			}
279
280			/**
281			* @return string
282			*/
283			public function toPEM()
284			{
285			$result = '-----BEGIN '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL;
286			$result .= chunk_split(base64_encode($this->getBinary()), 64, PHP_EOL);
287			$result .= '-----END '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL;
288
289			return $result;
290			}
291
292			/**
293			* @param $curve
294			*
295			* @return string
296			*/
297			private function getOID($curve)
298			{
299			$curves = $this->getSupportedCurves();
300			$oid = array_key_exists($curve, $curves) ? $curves[$curve] : null;
301
302			Assertion::notNull($oid, 'Unsupported curve');
303
304			return $oid;
305			}
306
307			/**
308			* @param string $oid
309			*
310			* @return string
311			*/
312			private function getCurve($oid)
313			{
314			$curves = $this->getSupportedCurves();
315			$curve = array_search($oid, $curves, true);
316			Assertion::string($curve, 'Unsupported OID');
317
318			return $curve;
319			}
320
321			/**
322			* @return array
323			*/
324			private function getSupportedCurves()
325			{
326			return [
327			'P-256' => '1.2.840.10045.3.1.7',
328			'P-384' => '1.3.132.0.34',
329			'P-521' => '1.3.132.0.35',
330			];
331			}
332			}
333

Spomky-Labs / jose

Pull Request — master (#146)

ECKey::loadPEM() B

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