Signer::canonize() - Code Metrics - Inspection of "scrutinizer" - nfephp-org/sped-common - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Pull Request — master (#245)

by Roberto

created 2021-04-29 17:44 UTC

Signer::canonize() A

↳ Parent: Signer

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	9
ccs	6
cts	6
cp	1
rs	9.9666
c	0
b	0
f	0
cc	1
nc	1
nop	2
crap	1

<?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 = [true,false,null,null];
    
    /**
     * Make Signature tag
     * @param Certificate $certificate
     * @param string $content xml for signed
     * @param string $tagname
     * @param string $mark for URI (opcional)
     * @param int $algorithm (opcional)
     * @param array $canonical parameters to format node for signature (opcional)
     * @param string $rootname name of tag to insert signature block (opcional)
     * @return string
     * @throws SignerException
     */
    public static function sign(
        Certificate $certificate,
        $content,
        $tagname,
        $mark = 'Id',
        $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL,
        $rootname = '',
        $options = []
    ) {
        if (empty($content)) {
            throw SignerException::isNotXml();
        }
        if (!Validator::isXML($content)) {
            throw SignerException::isNotXml();
        }
        $dom = new DOMDocument('1.0', 'UTF-8');
        $dom->loadXML($content);
        $dom->preserveWhiteSpace = false;
        $dom->formatOutput = false;
        $root = $dom->documentElement;
        if (!empty($rootname)) {
            $root = $dom->getElementsByTagName($rootname)->item(0);
        }
        $node = $dom->getElementsByTagName($tagname)->item(0);
        if (empty($node) || empty($root)) {
            throw SignerException::tagNotFound($tagname);
        }
        if (!self::existsSignature($content)) {
            $dom = self::createSignature(
                $certificate,
                $dom,
                $root,
                $node,

                $mark,
                $algorithm,
                $canonical,
                $options
            );
        }
        return $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL);
    }
    
    /**
     * Method that provides the signature of xml as standard SEFAZ
     * @param Certificate $certificate
     * @param \DOMDocument $dom
     * @param \DOMNode $root xml root
     * @param \DOMElement $node node to be signed
     * @param string $mark Marker signed attribute
     * @param int $algorithm cryptographic algorithm (opcional)
     * @param array $canonical parameters to format node for signature (opcional)
     * @return \DOMDocument
     */
    private static function createSignature(
        Certificate $certificate,
        DOMDocument $dom,
        DOMNode $root,
        DOMElement $node,
        $mark,
        $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL,
        $options = []
    ) {
        $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));
        $digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
        $signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
        $root->appendChild($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);
        $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);

        if (!empty($options["subjectName"])) {
            $subjectName = $certificate->publicKey->subjectNameValue;
            $x509SubjectNode = $dom->createElement('X509SubjectName', $subjectName);
            $x509DataNode->appendChild($x509SubjectNode);
        }

        $pubKeyClean = $certificate->publicKey->unFormated();
        $x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
        $x509DataNode->appendChild($x509CertificateNode);
        return $dom;
    }
    /**
     * Remove old signature from document to replace it
     * @param string $content
     * @return string
     */
    public static function removeSignature($content)
    {
        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 (opcional)
     * @param array $canonical parameters to format node for signature (opcional)
     * @return boolean
     * @throws SignerException Not is a XML, Digest or Signature dont match
     */
    public static function isSigned($content, $tagname = '', $canonical = self::CANONICAL)
    {
        if (!self::existsSignature($content)) {
            return false;
        }
        if (!self::digestCheck($content, $tagname, $canonical)) {
            return false;
        }
        return self::signatureCheck($content, $canonical);
    }
    
    /**
     * Check if Signature tag already exists
     * @param string $content
     * @return boolean
     */
    public static function existsSignature($content)
    {
        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 $canonical
     * @return boolean
     */
    public static function signatureCheck($xml, $canonical = self::CANONICAL)
    {
        $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 $canonical
     * @return bool
     * @throws SignerException
     */
    public static function digestCheck($xml, $tagname = '', $canonical = self::CANONICAL)
    {
        $dom = new \DOMDocument('1.0', 'utf-8');
        $dom->formatOutput = false;
        $dom->preserveWhiteSpace = false;
        $dom->loadXML($xml);
        $root = $dom->documentElement;
        $signature = $dom->getElementsByTagName('Signature')->item(0);
        $sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
        if (empty($tagname)) {
            if (empty($sigURI)) {
                $tagname = $root->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);
        }
        $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, $algorithm, $canonical = self::CANONICAL)
    {
        //calcular o hash dos dados
        $c14n = self::canonize($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)
    {
        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 = [true,false,null,null];
36
37		/**
38		* Make Signature tag
39		* @param Certificate $certificate
40		* @param string $content xml for signed
41		* @param string $tagname
42		* @param string $mark for URI (opcional)
43		* @param int $algorithm (opcional)
44		* @param array $canonical parameters to format node for signature (opcional)
45		* @param string $rootname name of tag to insert signature block (opcional)
46		* @return string
47		* @throws SignerException
48		*/
49	2	public static function sign(
50		Certificate $certificate,
51		$content,
52		$tagname,
53		$mark = 'Id',
54		$algorithm = OPENSSL_ALGO_SHA1,
55		$canonical = self::CANONICAL,
56		$rootname = '',
57		$options = []
58		) {
59	2	if (empty($content)) {
60		throw SignerException::isNotXml();
61		}
62	2	if (!Validator::isXML($content)) {
63	1	throw SignerException::isNotXml();
64		}
65	1	$dom = new DOMDocument('1.0', 'UTF-8');
66	1	$dom->loadXML($content);
67	1	$dom->preserveWhiteSpace = false;
68	1	$dom->formatOutput = false;
69	1	$root = $dom->documentElement;
70	1	if (!empty($rootname)) {
71		$root = $dom->getElementsByTagName($rootname)->item(0);
72		}
73	1	$node = $dom->getElementsByTagName($tagname)->item(0);
74	1	if (empty($node) \|\| empty($root)) {
75		throw SignerException::tagNotFound($tagname);
76		}
77	1	if (!self::existsSignature($content)) {
78	1	$dom = self::createSignature(
79	1	$certificate,
80	1	$dom,
81	1	$root,
82	1	$node,
		0 ignored issues – show Compatibility introduced 2017-04-29 14:39 UTC by Report Bug Copy Issue Report `$node` 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...
83	1	$mark,
84	1	$algorithm,
85	1	$canonical,
86	1	$options
87		);
88		}
89	1	return $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL);
90		}
91
92		/**
93		* Method that provides the signature of xml as standard SEFAZ
94		* @param Certificate $certificate
95		* @param \DOMDocument $dom
96		* @param \DOMNode $root xml root
97		* @param \DOMElement $node node to be signed
98		* @param string $mark Marker signed attribute
99		* @param int $algorithm cryptographic algorithm (opcional)
100		* @param array $canonical parameters to format node for signature (opcional)
101		* @return \DOMDocument
102		*/
103	1	private static function createSignature(
104		Certificate $certificate,
105		DOMDocument $dom,
106		DOMNode $root,
107		DOMElement $node,
108		$mark,
109		$algorithm = OPENSSL_ALGO_SHA1,
110		$canonical = self::CANONICAL,
111		$options = []
112		) {
113	1	$nsDSIG = 'http://www.w3.org/2000/09/xmldsig#';
114	1	$nsCannonMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
115	1	$nsSignatureMethod = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
116	1	$nsDigestMethod = 'http://www.w3.org/2000/09/xmldsig#sha1';
117	1	$digestAlgorithm = 'sha1';
118	1	if ($algorithm == OPENSSL_ALGO_SHA256) {
119		$digestAlgorithm = 'sha256';
120		$nsSignatureMethod = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
121		$nsDigestMethod = 'http://www.w3.org/2001/04/xmlenc#sha256';
122		}
123	1	$nsTransformMethod1 ='http://www.w3.org/2000/09/xmldsig#enveloped-signature';
124	1	$nsTransformMethod2 = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
125	1	$idSigned = trim($node->getAttribute($mark));
126	1	$digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
127	1	$signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
128	1	$root->appendChild($signatureNode);
129	1	$signedInfoNode = $dom->createElement('SignedInfo');
130	1	$signatureNode->appendChild($signedInfoNode);
131	1	$canonicalNode = $dom->createElement('CanonicalizationMethod');
132	1	$signedInfoNode->appendChild($canonicalNode);
133	1	$canonicalNode->setAttribute('Algorithm', $nsCannonMethod);
134	1	$signatureMethodNode = $dom->createElement('SignatureMethod');
135	1	$signedInfoNode->appendChild($signatureMethodNode);
136	1	$signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod);
137	1	$referenceNode = $dom->createElement('Reference');
138	1	$signedInfoNode->appendChild($referenceNode);
139	1	if (!empty($idSigned)) {
140	1	$idSigned = "#$idSigned";
141		}
142	1	$referenceNode->setAttribute('URI', $idSigned);
143	1	$transformsNode = $dom->createElement('Transforms');
144	1	$referenceNode->appendChild($transformsNode);
145	1	$transfNode1 = $dom->createElement('Transform');
146	1	$transformsNode->appendChild($transfNode1);
147	1	$transfNode1->setAttribute('Algorithm', $nsTransformMethod1);
148	1	$transfNode2 = $dom->createElement('Transform');
149	1	$transformsNode->appendChild($transfNode2);
150	1	$transfNode2->setAttribute('Algorithm', $nsTransformMethod2);
151	1	$digestMethodNode = $dom->createElement('DigestMethod');
152	1	$referenceNode->appendChild($digestMethodNode);
153	1	$digestMethodNode->setAttribute('Algorithm', $nsDigestMethod);
154	1	$digestValueNode = $dom->createElement('DigestValue', $digestValue);
155	1	$referenceNode->appendChild($digestValueNode);
156	1	$c14n = self::canonize($signedInfoNode, $canonical);
157	1	$signature = $certificate->sign($c14n, $algorithm);
158	1	$signatureValue = base64_encode($signature);
159	1	$signatureValueNode = $dom->createElement('SignatureValue', $signatureValue);
160	1	$signatureNode->appendChild($signatureValueNode);
161	1	$keyInfoNode = $dom->createElement('KeyInfo');
162	1	$signatureNode->appendChild($keyInfoNode);
163	1	$x509DataNode = $dom->createElement('X509Data');
164	1	$keyInfoNode->appendChild($x509DataNode);
165
166	1	if (!empty($options["subjectName"])) {
167		$subjectName = $certificate->publicKey->subjectNameValue;
168		$x509SubjectNode = $dom->createElement('X509SubjectName', $subjectName);
169		$x509DataNode->appendChild($x509SubjectNode);
170		}
171
172	1	$pubKeyClean = $certificate->publicKey->unFormated();
173	1	$x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
174	1	$x509DataNode->appendChild($x509CertificateNode);
175	1	return $dom;
176		}
177		/**
178		* Remove old signature from document to replace it
179		* @param string $content
180		* @return string
181		*/
182	1	public static function removeSignature($content)
183		{
184	1	if (!self::existsSignature($content)) {
185		return $content;
186		}
187	1	$dom = new \DOMDocument('1.0', 'utf-8');
188	1	$dom->formatOutput = false;
189	1	$dom->preserveWhiteSpace = false;
190	1	$dom->loadXML($content);
191	1	$node = $dom->documentElement;
192	1	$signature = $node->getElementsByTagName('Signature')->item(0);
193	1	if (!empty($signature)) {
194	1	$parent = $signature->parentNode;
195	1	$parent->removeChild($signature);
196		}
197	1	return $dom->saveXML();
198		}
199		/**
200		* Verify if xml signature is valid
201		* @param string $content
202		* @param string $tagname tag for sign (opcional)
203		* @param array $canonical parameters to format node for signature (opcional)
204		* @return boolean
205		* @throws SignerException Not is a XML, Digest or Signature dont match
206		*/
207	6	public static function isSigned($content, $tagname = '', $canonical = self::CANONICAL)
208		{
209	6	if (!self::existsSignature($content)) {
210	1	return false;
211		}
212	5	if (!self::digestCheck($content, $tagname, $canonical)) {
213		return false;
214		}
215	3	return self::signatureCheck($content, $canonical);
216		}
217
218		/**
219		* Check if Signature tag already exists
220		* @param string $content
221		* @return boolean
222		*/
223	6	public static function existsSignature($content)
224		{
225	6	if (!Validator::isXML($content)) {
226		throw SignerException::isNotXml();
227		}
228	6	$dom = new \DOMDocument('1.0', 'utf-8');
229	6	$dom->formatOutput = false;
230	6	$dom->preserveWhiteSpace = false;
231	6	$dom->loadXML($content);
232	6	$signature = $dom->getElementsByTagName('Signature')->item(0);
233	6	return !empty($signature);
234		}
235
236		/**
237		* Verify signature value from SignatureInfo node and public key
238		* @param string $xml
239		* @param array $canonical
240		* @return boolean
241		*/
242	3	public static function signatureCheck($xml, $canonical = self::CANONICAL)
243		{
244	3	$dom = new \DOMDocument('1.0', 'utf-8');
245	3	$dom->formatOutput = false;
246	3	$dom->preserveWhiteSpace = false;
247	3	$dom->loadXML($xml);
248
249	3	$signature = $dom->getElementsByTagName('Signature')->item(0);
250	3	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
251	3	$algorithm = OPENSSL_ALGO_SHA256;
252	3	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
253	3	$algorithm = OPENSSL_ALGO_SHA1;
254		}
255	3	$certificateContent = $signature->getElementsByTagName('X509Certificate')->item(0)->nodeValue;
256	3	$publicKey = PublicKey::createFromContent($certificateContent);
257	3	$signInfoNode = self::canonize($signature->getElementsByTagName('SignedInfo')->item(0), $canonical);
258	3	$signatureValue = $signature->getElementsByTagName('SignatureValue')->item(0)->nodeValue;
259	3	$decodedSignature = base64_decode(str_replace(array("\r", "\n"), '', $signatureValue));
260	3	if (!$publicKey->verify($signInfoNode, $decodedSignature, $algorithm)) {
261	1	throw SignerException::signatureComparisonFailed();
262		}
263	2	return true;
264		}
265
266		/**
267		* Verify digest value of data node
268		* @param string $xml
269		* @param string $tagname
270		* @param array $canonical
271		* @return bool
272		* @throws SignerException
273		*/
274	5	public static function digestCheck($xml, $tagname = '', $canonical = self::CANONICAL)
275		{
276	5	$dom = new \DOMDocument('1.0', 'utf-8');
277	5	$dom->formatOutput = false;
278	5	$dom->preserveWhiteSpace = false;
279	5	$dom->loadXML($xml);
280	5	$root = $dom->documentElement;
281	5	$signature = $dom->getElementsByTagName('Signature')->item(0);
282	5	$sigURI = $signature->getElementsByTagName('Reference')->item(0)->getAttribute('URI');
283	5	if (empty($tagname)) {
284	4	if (empty($sigURI)) {
285		$tagname = $root->nodeName;
286		} else {
287	4	$xpath = new \DOMXPath($dom);
288	4	$entries = $xpath->query('//@Id');
289	4	foreach ($entries as $entry) {
290	4	$tagname = $entry->ownerElement->nodeName;
291	4	break;
292		}
293		}
294		}
295	5	$node = $dom->getElementsByTagName($tagname)->item(0);
296	5	if (empty($node)) {
297	1	throw SignerException::tagNotFound($tagname);
298		}
299	4	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')->item(0)->getAttribute('Algorithm');
300	4	$algorithm = 'sha256';
301	4	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
302	4	$algorithm = 'sha1';
303		}
304	4	if ($sigURI == '') {
305		$node->removeChild($signature);
306		}
307	4	$calculatedDigest = self::makeDigest($node, $algorithm, $canonical);
308	4	$informedDigest = $signature->getElementsByTagName('DigestValue')->item(0)->nodeValue;
309	4	if ($calculatedDigest != $informedDigest) {
310	1	throw SignerException::digestComparisonFailed();
311		}
312	3	return true;
313		}
314
315		/**
316		* Calculate digest value for given node
317		* @param DOMNode $node
318		* @param string $algorithm
319		* @param array $canonical
320		* @return string
321		*/
322	4	private static function makeDigest(DOMNode $node, $algorithm, $canonical = self::CANONICAL)
323		{
324		//calcular o hash dos dados
325	4	$c14n = self::canonize($node, $canonical);
326	4	$hashValue = hash($algorithm, $c14n, true);
327	4	return base64_encode($hashValue);
328		}
329
330		/**
331		* Reduced to the canonical form
332		* @param DOMNode $node
333		* @param array $canonical
334		* @return string
335		*/
336	4	private static function canonize(DOMNode $node, $canonical = self::CANONICAL)
337		{
338	4	return $node->C14N(
339	4	$canonical[0],
340	4	$canonical[1],
341	4	$canonical[2],
342	4	$canonical[3]
343		);
344		}
345		}
346

nfephp-org / sped-common

Pull Request — master (#245)

Signer::canonize() A

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