Signer::existsSignature() - Code Metrics - Inspection of "Limpeza e melhoria do método de assinatura" - nfephp-org/sped-common - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#174)

unknown

created 2018-05-29 08:34 UTC

Signer::existsSignature() A

↳ Parent: Signer

Complexity

Conditions	2
Paths	2

Size

Total Lines	14
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	2.0054

Importance

Changes

Metric	Value
dl	0
loc	14
ccs	8
cts	9
cp	0.8889
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	9
nc	2
nop	1
crap	2.0054

<?php

namespace NFePHP\Common;

/**
 * Class to signner a Xml
 * Meets packages:
 *     sped-nfe,
 *     sped-cte,
 *     sped-mdfe,
 *     sped-nfse,
 *     sped-efinanceira
 *     sped-esocial
 *     sped-efdreinf
 *     e sped-esfinge
 *
 * @category  NFePHP
 * @package   NFePHP\Common\Signer
 * @copyright NFePHP Copyright (c) 2016
 * @license   http://www.gnu.org/licenses/lgpl.txt LGPLv3+
 * @license   https://opensource.org/licenses/MIT MIT
 * @license   http://www.gnu.org/licenses/gpl.txt GPLv3+
 * @author    Roberto L. Machado <linux.rlm at gmail dot com>
 * @link      http://github.com/nfephp-org/sped-common for the canonical source repository
 */

use NFePHP\Common\Certificate\PublicKey;
use NFePHP\Common\Exception\SignerException;
use DOMDocument;
use DOMNode;
use DOMElement;

class Signer
{
    const CANONICAL = array(true,false,null,null);
    private static $canonical = self::CANONICAL;

    /**
     * Make Signature for multiple tags within the document.
     *
     * @param Certificate $certificate
     * @param \DOMDocument $doc The XML to sign.
     * @param array $tags the tags to include signature.
     * @param string $mark for URI (optional).
     * @param int $algorithm (optional).
     * @param array $canonical parameters to format node for signature (optional).
     *
     * @return \DOMDocument
     *
     * @throws SignerException
     */
    public static function signMultipleTags(
        Certificate $certificate,
        DOMDocument $doc,
        array $tags,
        string $mark = 'Id',
        int $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL
    ): DOMDocument {
        $signed = $doc;

        foreach ($tags as $tagName) {
            $node = $signed->getElementsByTagName($tagName)->item(0); //TODO: loop here too when multiple tags found.
            
            $signed = self::sign(
                $certificate,
                $signed,
                $node,
                $mark,
                $algorithm,
                $canonical
            );

            if (!Signer::isSigned($signed->saveXML(), $tagName)) {
                throw SignerException::signatureComparisonFailed();
            }
        }

        return $signed;
    }
    
    /**
     * Make the Signature tag.
     *
     * @param Certificate $certificate
     * @param \DOMDocument $content xml to sign
     * @param \DOMNode $tagNode The tagNode to be signed
     * @param string $mark for URI (optional)
     * @param int $algorithm (optional)
     * @param array $canonical parameters to format node for signature (optional)
     *
     * @return \DOMDocument
     *
     * @throws SignerException
     */
    public static function sign(
        Certificate $certificate,
        DOMDocument $content,
        DOMNode $tagNode,
        string $mark = 'Id',
        int $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL
    ): DOMDocument {
        if (!empty($canonical)) {
            self::$canonical = $canonical;
        }
        
        return self::createSignature(
            $certificate,
            $content,
            $tagNode,

            $mark,
            $algorithm,
            $canonical
        );
    }
    
    /**
     * Method that provides the signature of xml as standard SEFAZ.
     *
     * @param Certificate $certificate
     * @param \DOMDocument $dom The original document
     * @param \DOMElement $node node to be signed
     * @param string $mark Marker signed attribute
     * @param int $algorithm cryptographic algorithm (optional)
     * @param array $canonical parameters to format node for signature (optional)
     *
     * @return \DOMDocument
     */
    private static function createSignature(
        Certificate $certificate,
        DOMDocument $dom,
        DOMElement $node,
        string $mark,
        int $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL
    ): DOMDocument {
        $nsDSIG = 'http://www.w3.org/2000/09/xmldsig#';
        $nsCannonMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
        $nsSignatureMethod = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
        $nsDigestMethod = 'http://www.w3.org/2000/09/xmldsig#sha1';
        $digestAlgorithm = 'sha1';
        if ($algorithm == OPENSSL_ALGO_SHA256) {
            $digestAlgorithm = 'sha256';
            $nsSignatureMethod = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
            $nsDigestMethod = 'http://www.w3.org/2001/04/xmlenc#sha256';
        }
        $nsTransformMethod1 ='http://www.w3.org/2000/09/xmldsig#enveloped-signature';
        $nsTransformMethod2 = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
        $idSigned = trim($node->getAttribute($mark));
        $signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
        $signatureNode->setAttribute('Id', "Ass_$idSigned");
        $node->parentNode->appendChild($signatureNode);
        $signedInfoNode = $dom->createElement('SignedInfo');
        $signatureNode->appendChild($signedInfoNode);
        $canonicalNode = $dom->createElement('CanonicalizationMethod');
        $signedInfoNode->appendChild($canonicalNode);
        $canonicalNode->setAttribute('Algorithm', $nsCannonMethod);
        $signatureMethodNode = $dom->createElement('SignatureMethod');
        $signedInfoNode->appendChild($signatureMethodNode);
        $signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod);
        $referenceNode = $dom->createElement('Reference');
        $signedInfoNode->appendChild($referenceNode);
        
        if (!empty($idSigned)) {
            $idSigned = "#$idSigned";
        }
        
        $referenceNode->setAttribute('URI', $idSigned);
        $transformsNode = $dom->createElement('Transforms');
        $referenceNode->appendChild($transformsNode);
        $transfNode1 = $dom->createElement('Transform');
        $transformsNode->appendChild($transfNode1);
        $transfNode1->setAttribute('Algorithm', $nsTransformMethod1);
        $transfNode2 = $dom->createElement('Transform');
        $transformsNode->appendChild($transfNode2);
        $transfNode2->setAttribute('Algorithm', $nsTransformMethod2);
        $digestMethodNode = $dom->createElement('DigestMethod');
        $referenceNode->appendChild($digestMethodNode);
        $digestMethodNode->setAttribute('Algorithm', $nsDigestMethod);
        $digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
        $digestValueNode = $dom->createElement('DigestValue', $digestValue);
        $referenceNode->appendChild($digestValueNode);
        $c14n = self::canonize($signedInfoNode, $canonical);
        $signature = $certificate->sign($c14n, $algorithm);
        $signatureValue = base64_encode($signature);
        $signatureValueNode = $dom->createElement('SignatureValue', $signatureValue);
        $signatureNode->appendChild($signatureValueNode);
        $keyInfoNode = $dom->createElement('KeyInfo');
        $signatureNode->appendChild($keyInfoNode);
        $x509DataNode = $dom->createElement('X509Data');
        $keyInfoNode->appendChild($x509DataNode);
        $pubKeyClean = $certificate->publicKey->unFormated();
        $x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
        $x509DataNode->appendChild($x509CertificateNode);

        return $dom;
    }

    /**
     * Remove old signature from document to replace it
     * @param string $content
     * @return string
     */
    public static function removeSignature(string $content): string
    {
        if (!self::existsSignature($content)) {
            return $content;
        }

        $dom = new \DOMDocument('1.0', 'utf-8');
        $dom->formatOutput = false;
        $dom->preserveWhiteSpace = false;
        $dom->loadXML($content);
        $node = $dom->documentElement;
        $signature = $node->getElementsByTagName('Signature')->item(0);

        if (!empty($signature)) {
            $parent = $signature->parentNode;
            $parent->removeChild($signature);
        }

        return $dom->saveXML();
    }

    /**
     * Verify if xml signature is valid
     * @param string $content
     * @param string $tagname tag for sign (optional)
     * @param array $canonical parameters to format node for signature (optional)
     * @return bool
     * @throws SignerException Not is a XML, Digest or Signature dont match
     */
    public static function isSigned(string $content, string $tagname = '', $canonical = self::CANONICAL): bool
    {
        if (!self::existsSignature($content)) {
            return false;
        }

        if (!self::digestCheck($content, $tagname, $canonical)) {
            return false;
        }

        return self::signatureCheck($content, $canonical);
    }
    
    /**
     * Check if Signature tag already exists
     * @param string $content
     * @return boolean
     */
    public static function existsSignature(string $content): bool
    {
        if (!Validator::isXML($content)) {
            throw SignerException::isNotXml();
        }

        $dom = new \DOMDocument('1.0', 'utf-8');
        $dom->formatOutput = false;
        $dom->preserveWhiteSpace = false;
        $dom->loadXML($content);
        $signature = $dom->getElementsByTagName('Signature')->item(0);

        return !empty($signature);
    }
    
    /**
     * Verify signature value from SignatureInfo node and public key
     * @param string $xml
     * @param array $canonical
     * @return boolean
     */
    private static function signatureCheck(string $xml, $canonical = self::CANONICAL): bool
    {
        $dom = new \DOMDocument('1.0', 'utf-8');
        $dom->formatOutput = false;
        $dom->preserveWhiteSpace = false;
        $dom->loadXML($xml);
        
        $signature = $dom->getElementsByTagName('Signature')->item(0);
        $sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
        $algorithm = OPENSSL_ALGO_SHA256;

        if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
            $algorithm = OPENSSL_ALGO_SHA1;
        }

        $certificateContent = $signature->getElementsByTagName('X509Certificate')->item(0)->nodeValue;
        $publicKey = PublicKey::createFromContent($certificateContent);
        $signInfoNode = self::canonize(
            $signature->getElementsByTagName('SignedInfo')->item(0),
            $canonical
        );
        $signatureValue = $signature->getElementsByTagName('SignatureValue')->item(0)->nodeValue;
        $decodedSignature = base64_decode(
            str_replace(array("\r", "\n"), '', $signatureValue)
        );

        if (!$publicKey->verify($signInfoNode, $decodedSignature, $algorithm)) {
            throw SignerException::signatureComparisonFailed();
        }

        return true;
    }
    
    /**
     * Verify digest value of data node
     * @param string $xml
     * @param string $tagname
     * @param array $canonical
     * @return bool
     * @throws SignerException
     */
    private static function digestCheck(string $xml, string $tagname = '', $canonical = self::CANONICAL): bool
    {
        $dom = new \DOMDocument('1.0', 'utf-8');
        $dom->formatOutput = false;
        $dom->preserveWhiteSpace = false;
        $dom->loadXML($xml);

        $signature = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
        $sigURI = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
        $node = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}

        if (empty($tagname)) {
            $signature = $dom->getElementsByTagName('Signature')->item(0);
            $sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
            if (empty($sigURI)) {
                $tagname = $dom->documentElement->nodeName;
            } else {
                $xpath = new \DOMXPath($dom);
                $entries = $xpath->query('//@Id');
                foreach ($entries as $entry) {
                    $tagname = $entry->ownerElement->nodeName;
                    break;
                }
            }
            $node = $dom->getElementsByTagName($tagname)->item(0);
            if (empty($node)) {
                throw SignerException::tagNotFound($tagname);
            }
        } else {
            $node = $dom->getElementsByTagName($tagname)->item(0);
            if (empty($node)) {
                throw SignerException::tagNotFound($tagname);
            }
            
            $signature = $node->nextSibling;
            if ($signature->nodeName !== 'Signature') {
                throw SignerException::tagNotFound('Signature');
            }
            
            $sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
        }

        $sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
        $algorithm = 'sha256';

        if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
            $algorithm = 'sha1';
        }

        if ($sigURI == '') {
            $node->removeChild($signature);
        }

        $calculatedDigest = self::makeDigest($node, $algorithm, $canonical);
        $informedDigest = $signature->getElementsByTagName('DigestValue')->item(0)->nodeValue;

        if ($calculatedDigest != $informedDigest) {
            throw SignerException::digestComparisonFailed();
        }
        
        return true;
    }
    
    /**
     * Calculate digest value for given node
     * @param DOMNode $node
     * @param string $algorithm
     * @param array $canonical
     * @return string
     */
    private static function makeDigest(DOMNode $node, string $algorithm, $canonical = self::CANONICAL): string
    {
        $c14n = self::canonize($node, $canonical);
        $hashValue = hash($algorithm, $c14n, true);

        return base64_encode($hashValue);
    }
    
    /**
     * Reduced to the canonical form
     * @param DOMNode $node
     * @param array $canonical
     * @return string
     */
    private static function canonize(DOMNode $node, $canonical = self::CANONICAL): string
    {
        return $node->C14N(
            $canonical[0],
            $canonical[1],
            $canonical[2],
            $canonical[3]
        );
    }
}


1		<?php
2
3		namespace NFePHP\Common;
4
5		/**
6		* Class to signner a Xml
7		* Meets packages:
8		* sped-nfe,
9		* sped-cte,
10		* sped-mdfe,
11		* sped-nfse,
12		* sped-efinanceira
13		* sped-esocial
14		* sped-efdreinf
15		* e sped-esfinge
16		*
17		* @category NFePHP
18		* @package NFePHP\Common\Signer
19		* @copyright NFePHP Copyright (c) 2016
20		* @license http://www.gnu.org/licenses/lgpl.txt LGPLv3+
21		* @license https://opensource.org/licenses/MIT MIT
22		* @license http://www.gnu.org/licenses/gpl.txt GPLv3+
23		* @author Roberto L. Machado <linux.rlm at gmail dot com>
24		* @link http://github.com/nfephp-org/sped-common for the canonical source repository
25		*/
26
27		use NFePHP\Common\Certificate\PublicKey;
28		use NFePHP\Common\Exception\SignerException;
29		use DOMDocument;
30		use DOMNode;
31		use DOMElement;
32
33		class Signer
34		{
35		const CANONICAL = array(true,false,null,null);
36		private static $canonical = self::CANONICAL;
37
38		/**
39		* Make Signature for multiple tags within the document.
40		*
41		* @param Certificate $certificate
42		* @param \DOMDocument $doc The XML to sign.
43		* @param array $tags the tags to include signature.
44		* @param string $mark for URI (optional).
45		* @param int $algorithm (optional).
46		* @param array $canonical parameters to format node for signature (optional).
47		*
48		* @return \DOMDocument
49		*
50		* @throws SignerException
51		*/
52		public static function signMultipleTags(
53		Certificate $certificate,
54		DOMDocument $doc,
55		array $tags,
56		string $mark = 'Id',
57		int $algorithm = OPENSSL_ALGO_SHA1,
58		$canonical = self::CANONICAL
59		): DOMDocument {
60		$signed = $doc;
61
62		foreach ($tags as $tagName) {
63		$node = $signed->getElementsByTagName($tagName)->item(0); //TODO: loop here too when multiple tags found.
64
65		$signed = self::sign(
66		$certificate,
67		$signed,
68		$node,
69		$mark,
70		$algorithm,
71		$canonical
72		);
73
74		if (!Signer::isSigned($signed->saveXML(), $tagName)) {
75		throw SignerException::signatureComparisonFailed();
76		}
77		}
78
79		return $signed;
80		}
81
82		/**
83		* Make the Signature tag.
84		*
85		* @param Certificate $certificate
86		* @param \DOMDocument $content xml to sign
87		* @param \DOMNode $tagNode The tagNode to be signed
88		* @param string $mark for URI (optional)
89		* @param int $algorithm (optional)
90		* @param array $canonical parameters to format node for signature (optional)
91		*
92		* @return \DOMDocument
93		*
94		* @throws SignerException
95		*/
96	1	public static function sign(
97		Certificate $certificate,
98		DOMDocument $content,
99		DOMNode $tagNode,
100		string $mark = 'Id',
101		int $algorithm = OPENSSL_ALGO_SHA1,
102		$canonical = self::CANONICAL
103		): DOMDocument {
104	1	if (!empty($canonical)) {
105	1	self::$canonical = $canonical;
106		}
107
108	1	return self::createSignature(
109		$certificate,
110		$content,
111		$tagNode,
		0 ignored issues – show Compatibility introduced 2018-05-29 08:04 UTC by Report Bug Copy Issue Report `$tagNode` of type `object<DOMNode>` is not a sub-type of `object<DOMElement>`. It seems like you assume a child class of the class `DOMNode` to be always present. This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass. Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type. Loading history...
112		$mark,
113		$algorithm,
114		$canonical
115		);
116		}
117
118		/**
119		* Method that provides the signature of xml as standard SEFAZ.
120		*
121		* @param Certificate $certificate
122		* @param \DOMDocument $dom The original document
123		* @param \DOMElement $node node to be signed
124		* @param string $mark Marker signed attribute
125		* @param int $algorithm cryptographic algorithm (optional)
126		* @param array $canonical parameters to format node for signature (optional)
127		*
128		* @return \DOMDocument
129		*/
130	1	private static function createSignature(
131		Certificate $certificate,
132		DOMDocument $dom,
133		DOMElement $node,
134		string $mark,
135		int $algorithm = OPENSSL_ALGO_SHA1,
136		$canonical = self::CANONICAL
137		): DOMDocument {
138	1	$nsDSIG = 'http://www.w3.org/2000/09/xmldsig#';
139	1	$nsCannonMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
140	1	$nsSignatureMethod = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
141	1	$nsDigestMethod = 'http://www.w3.org/2000/09/xmldsig#sha1';
142	1	$digestAlgorithm = 'sha1';
143	1	if ($algorithm == OPENSSL_ALGO_SHA256) {
144		$digestAlgorithm = 'sha256';
145		$nsSignatureMethod = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
146		$nsDigestMethod = 'http://www.w3.org/2001/04/xmlenc#sha256';
147		}
148	1	$nsTransformMethod1 ='http://www.w3.org/2000/09/xmldsig#enveloped-signature';
149	1	$nsTransformMethod2 = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
150	1	$idSigned = trim($node->getAttribute($mark));
151	1	$signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
152	1	$signatureNode->setAttribute('Id', "Ass_$idSigned");
153	1	$node->parentNode->appendChild($signatureNode);
154	1	$signedInfoNode = $dom->createElement('SignedInfo');
155	1	$signatureNode->appendChild($signedInfoNode);
156	1	$canonicalNode = $dom->createElement('CanonicalizationMethod');
157	1	$signedInfoNode->appendChild($canonicalNode);
158	1	$canonicalNode->setAttribute('Algorithm', $nsCannonMethod);
159	1	$signatureMethodNode = $dom->createElement('SignatureMethod');
160	1	$signedInfoNode->appendChild($signatureMethodNode);
161	1	$signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod);
162	1	$referenceNode = $dom->createElement('Reference');
163	1	$signedInfoNode->appendChild($referenceNode);
164
165	1	if (!empty($idSigned)) {
166	1	$idSigned = "#$idSigned";
167		}
168
169	1	$referenceNode->setAttribute('URI', $idSigned);
170	1	$transformsNode = $dom->createElement('Transforms');
171	1	$referenceNode->appendChild($transformsNode);
172	1	$transfNode1 = $dom->createElement('Transform');
173	1	$transformsNode->appendChild($transfNode1);
174	1	$transfNode1->setAttribute('Algorithm', $nsTransformMethod1);
175	1	$transfNode2 = $dom->createElement('Transform');
176	1	$transformsNode->appendChild($transfNode2);
177	1	$transfNode2->setAttribute('Algorithm', $nsTransformMethod2);
178	1	$digestMethodNode = $dom->createElement('DigestMethod');
179	1	$referenceNode->appendChild($digestMethodNode);
180	1	$digestMethodNode->setAttribute('Algorithm', $nsDigestMethod);
181	1	$digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
182	1	$digestValueNode = $dom->createElement('DigestValue', $digestValue);
183	1	$referenceNode->appendChild($digestValueNode);
184	1	$c14n = self::canonize($signedInfoNode, $canonical);
185	1	$signature = $certificate->sign($c14n, $algorithm);
186	1	$signatureValue = base64_encode($signature);
187	1	$signatureValueNode = $dom->createElement('SignatureValue', $signatureValue);
188	1	$signatureNode->appendChild($signatureValueNode);
189	1	$keyInfoNode = $dom->createElement('KeyInfo');
190	1	$signatureNode->appendChild($keyInfoNode);
191	1	$x509DataNode = $dom->createElement('X509Data');
192	1	$keyInfoNode->appendChild($x509DataNode);
193	1	$pubKeyClean = $certificate->publicKey->unFormated();
194	1	$x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
195	1	$x509DataNode->appendChild($x509CertificateNode);
196
197	1	return $dom;
198		}
199
200		/**
201		* Remove old signature from document to replace it
202		* @param string $content
203		* @return string
204		*/
205	1	public static function removeSignature(string $content): string
206		{
207	1	if (!self::existsSignature($content)) {
208		return $content;
209		}
210
211	1	$dom = new \DOMDocument('1.0', 'utf-8');
212	1	$dom->formatOutput = false;
213	1	$dom->preserveWhiteSpace = false;
214	1	$dom->loadXML($content);
215	1	$node = $dom->documentElement;
216	1	$signature = $node->getElementsByTagName('Signature')->item(0);
217
218	1	if (!empty($signature)) {
219	1	$parent = $signature->parentNode;
220	1	$parent->removeChild($signature);
221		}
222
223	1	return $dom->saveXML();
224		}
225
226		/**
227		* Verify if xml signature is valid
228		* @param string $content
229		* @param string $tagname tag for sign (optional)
230		* @param array $canonical parameters to format node for signature (optional)
231		* @return bool
232		* @throws SignerException Not is a XML, Digest or Signature dont match
233		*/
234	6	public static function isSigned(string $content, string $tagname = '', $canonical = self::CANONICAL): bool
235		{
236	6	if (!self::existsSignature($content)) {
237	1	return false;
238		}
239
240	5	if (!self::digestCheck($content, $tagname, $canonical)) {
241		return false;
242		}
243
244	3	return self::signatureCheck($content, $canonical);
245		}
246
247		/**
248		* Check if Signature tag already exists
249		* @param string $content
250		* @return boolean
251		*/
252	6	public static function existsSignature(string $content): bool
253		{
254	6	if (!Validator::isXML($content)) {
255		throw SignerException::isNotXml();
256		}
257
258	6	$dom = new \DOMDocument('1.0', 'utf-8');
259	6	$dom->formatOutput = false;
260	6	$dom->preserveWhiteSpace = false;
261	6	$dom->loadXML($content);
262	6	$signature = $dom->getElementsByTagName('Signature')->item(0);
263
264	6	return !empty($signature);
265		}
266
267		/**
268		* Verify signature value from SignatureInfo node and public key
269		* @param string $xml
270		* @param array $canonical
271		* @return boolean
272		*/
273	3	private static function signatureCheck(string $xml, $canonical = self::CANONICAL): bool
274		{
275	3	$dom = new \DOMDocument('1.0', 'utf-8');
276	3	$dom->formatOutput = false;
277	3	$dom->preserveWhiteSpace = false;
278	3	$dom->loadXML($xml);
279
280	3	$signature = $dom->getElementsByTagName('Signature')->item(0);
281	3	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
282	3	$algorithm = OPENSSL_ALGO_SHA256;
283
284	3	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
285	3	$algorithm = OPENSSL_ALGO_SHA1;
286		}
287
288	3	$certificateContent = $signature->getElementsByTagName('X509Certificate')->item(0)->nodeValue;
289	3	$publicKey = PublicKey::createFromContent($certificateContent);
290	3	$signInfoNode = self::canonize(
291	3	$signature->getElementsByTagName('SignedInfo')->item(0),
292		$canonical
293		);
294	3	$signatureValue = $signature->getElementsByTagName('SignatureValue')->item(0)->nodeValue;
295	3	$decodedSignature = base64_decode(
296	3	str_replace(array("\r", "\n"), '', $signatureValue)
297		);
298
299	3	if (!$publicKey->verify($signInfoNode, $decodedSignature, $algorithm)) {
300	1	throw SignerException::signatureComparisonFailed();
301		}
302
303	2	return true;
304		}
305
306		/**
307		* Verify digest value of data node
308		* @param string $xml
309		* @param string $tagname
310		* @param array $canonical
311		* @return bool
312		* @throws SignerException
313		*/
314	5	private static function digestCheck(string $xml, string $tagname = '', $canonical = self::CANONICAL): bool
315		{
316	5	$dom = new \DOMDocument('1.0', 'utf-8');
317	5	$dom->formatOutput = false;
318	5	$dom->preserveWhiteSpace = false;
319	5	$dom->loadXML($xml);
320
321	5	$signature = null;
		0 ignored issues – show Unused Code introduced 2018-05-29 08:04 UTC by Report Bug Copy Issue Report `$signature` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
322	5	$sigURI = null;
		0 ignored issues – show Unused Code introduced 2018-05-29 08:04 UTC by Report Bug Copy Issue Report `$sigURI` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
323	5	$node = null;
		0 ignored issues – show Unused Code introduced 2018-05-29 08:04 UTC by Report Bug Copy Issue Report `$node` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
324
325	5	if (empty($tagname)) {
326	4	$signature = $dom->getElementsByTagName('Signature')->item(0);
327	4	$sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
328	4	if (empty($sigURI)) {
329		$tagname = $dom->documentElement->nodeName;
330		} else {
331	4	$xpath = new \DOMXPath($dom);
332	4	$entries = $xpath->query('//@Id');
333	4	foreach ($entries as $entry) {
334	4	$tagname = $entry->ownerElement->nodeName;
335	4	break;
336		}
337		}
338	4	$node = $dom->getElementsByTagName($tagname)->item(0);
339	4	if (empty($node)) {
340	4	throw SignerException::tagNotFound($tagname);
341		}
342		} else {
343	1	$node = $dom->getElementsByTagName($tagname)->item(0);
344	1	if (empty($node)) {
345	1	throw SignerException::tagNotFound($tagname);
346		}
347
348		$signature = $node->nextSibling;
349		if ($signature->nodeName !== 'Signature') {
350		throw SignerException::tagNotFound('Signature');
351		}
352
353		$sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
354		}
355
356	4	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
357	4	$algorithm = 'sha256';
358
359	4	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
360	4	$algorithm = 'sha1';
361		}
362
363	4	if ($sigURI == '') {
364		$node->removeChild($signature);
365		}
366
367	4	$calculatedDigest = self::makeDigest($node, $algorithm, $canonical);
368	4	$informedDigest = $signature->getElementsByTagName('DigestValue')->item(0)->nodeValue;
369
370	4	if ($calculatedDigest != $informedDigest) {
371	1	throw SignerException::digestComparisonFailed();
372		}
373
374	3	return true;
375		}
376
377		/**
378		* Calculate digest value for given node
379		* @param DOMNode $node
380		* @param string $algorithm
381		* @param array $canonical
382		* @return string
383		*/
384	4	private static function makeDigest(DOMNode $node, string $algorithm, $canonical = self::CANONICAL): string
385		{
386	4	$c14n = self::canonize($node, $canonical);
387	4	$hashValue = hash($algorithm, $c14n, true);
388
389	4	return base64_encode($hashValue);
390		}
391
392		/**
393		* Reduced to the canonical form
394		* @param DOMNode $node
395		* @param array $canonical
396		* @return string
397		*/
398	4	private static function canonize(DOMNode $node, $canonical = self::CANONICAL): string
399		{
400	4	return $node->C14N(
401	4	$canonical[0],
402	4	$canonical[1],
403	4	$canonical[2],
404	4	$canonical[3]
405		);
406		}
407		}
408

nfephp-org / sped-common

Pull Request — master (#174)

Signer::existsSignature() A

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