Signer::canonize() - Code Metrics - Inspection of "Sugestão: alteração do método Signer->sign para de..." - nfephp-org/sped-common - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#181)

unknown

created 2018-06-02 01:07 UTC

Signer::canonize() A

↳ Parent: Signer

Complexity

Conditions	1
Paths	1

Size

Total Lines	11
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	1

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	0
loc	11
ccs	6
cts	6
cp	1
rs	9.4285
cc	1
eloc	8
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)
     * @return string
     * @throws SignerException
     */
    public static function sign(
        Certificate $certificate,
        $content,
        $tagname,
        $mark = 'Id',
        $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL
    ) {
        if (empty($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;
        $node = $dom->getElementsByTagName($tagname)->item(0);
        if (empty($node)) {
            throw SignerException::tagNotFound($tagname);
        }
        if (! self::existsSignature($content)) {
            $dom = self::createSignature(
                $certificate,
                $dom,
                $node,

                $mark,
                $algorithm,
                $canonical
            );
        };
        return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
            . $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL);
    }
    
    /**
     * Method that provides the signature of xml as standard SEFAZ
     * @param Certificate $certificate
     * @param \DOMDocument $dom
     * @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,
        DOMElement $node,
        $mark,
        $algorithm = OPENSSL_ALGO_SHA1,
        $canonical = self::CANONICAL
    ) {
        $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');
        $node->parentNode->appendChild($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 $content
     * @return string
     */
    public static function removeSignature($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)) {
            if (self::digestCheck($content, $tagname, $canonical)) {
                if (self::signatureCheck($content, $canonical)) {
                    return true;
                }
            }
        }
        return false;
    }
    
    /**
     * 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 = $dom->getElementsByTagName('Signature')->item(0);
        if (empty($signature)) {
            return false;
        }
        return true;
    }
    
    /**
     * 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		* @return string
46		* @throws SignerException
47		*/
48	2	public static function sign(
49		Certificate $certificate,
50		$content,
51		$tagname,
52		$mark = 'Id',
53		$algorithm = OPENSSL_ALGO_SHA1,
54		$canonical = self::CANONICAL
55		) {
56	2	if (empty($content)) {
57		throw SignerException::isNotXml();
58		}
59	2	if (! Validator::isXML($content)) {
60	1	throw SignerException::isNotXml();
61		}
62	1	$dom = new DOMDocument('1.0', 'UTF-8');
63	1	$dom->loadXML($content);
64	1	$dom->preserveWhiteSpace = false;
65	1	$dom->formatOutput = false;
66	1	$node = $dom->getElementsByTagName($tagname)->item(0);
67	1	if (empty($node)) {
68		throw SignerException::tagNotFound($tagname);
69		}
70	1	if (! self::existsSignature($content)) {
71	1	$dom = self::createSignature(
72		$certificate,
73		$dom,
74		$node,
		0 ignored issues – show Compatibility introduced 2018-06-02 01:10 UTC by Report Bug Copy Issue Report `$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...
75		$mark,
76		$algorithm,
77		$canonical
78		);
79		};
80		return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
81	1	. $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL);
82		}
83
84		/**
85		* Method that provides the signature of xml as standard SEFAZ
86		* @param Certificate $certificate
87		* @param \DOMDocument $dom
88		* @param \DOMElement $node node to be signed
89		* @param string $mark Marker signed attribute
90		* @param int $algorithm cryptographic algorithm (opcional)
91		* @param array $canonical parameters to format node for signature (opcional)
92		* @return \DOMDocument
93		*/
94	1	private static function createSignature(
95		Certificate $certificate,
96		DOMDocument $dom,
97		DOMElement $node,
98		$mark,
99		$algorithm = OPENSSL_ALGO_SHA1,
100		$canonical = self::CANONICAL
101		) {
102	1	$nsDSIG = 'http://www.w3.org/2000/09/xmldsig#';
103	1	$nsCannonMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
104	1	$nsSignatureMethod = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
105	1	$nsDigestMethod = 'http://www.w3.org/2000/09/xmldsig#sha1';
106	1	$digestAlgorithm = 'sha1';
107	1	if ($algorithm == OPENSSL_ALGO_SHA256) {
108		$digestAlgorithm = 'sha256';
109		$nsSignatureMethod = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
110		$nsDigestMethod = 'http://www.w3.org/2001/04/xmlenc#sha256';
111		}
112	1	$nsTransformMethod1 ='http://www.w3.org/2000/09/xmldsig#enveloped-signature';
113	1	$nsTransformMethod2 = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
114	1	$idSigned = trim($node->getAttribute($mark));
115	1	$signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
116	1	$node->parentNode->appendChild($signatureNode);
117	1	$signedInfoNode = $dom->createElement('SignedInfo');
118	1	$signatureNode->appendChild($signedInfoNode);
119	1	$canonicalNode = $dom->createElement('CanonicalizationMethod');
120	1	$signedInfoNode->appendChild($canonicalNode);
121	1	$canonicalNode->setAttribute('Algorithm', $nsCannonMethod);
122	1	$signatureMethodNode = $dom->createElement('SignatureMethod');
123	1	$signedInfoNode->appendChild($signatureMethodNode);
124	1	$signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod);
125	1	$referenceNode = $dom->createElement('Reference');
126	1	$signedInfoNode->appendChild($referenceNode);
127	1	if (!empty($idSigned)) {
128	1	$idSigned = "#$idSigned";
129		}
130	1	$referenceNode->setAttribute('URI', $idSigned);
131	1	$transformsNode = $dom->createElement('Transforms');
132	1	$referenceNode->appendChild($transformsNode);
133	1	$transfNode1 = $dom->createElement('Transform');
134	1	$transformsNode->appendChild($transfNode1);
135	1	$transfNode1->setAttribute('Algorithm', $nsTransformMethod1);
136	1	$transfNode2 = $dom->createElement('Transform');
137	1	$transformsNode->appendChild($transfNode2);
138	1	$transfNode2->setAttribute('Algorithm', $nsTransformMethod2);
139	1	$digestMethodNode = $dom->createElement('DigestMethod');
140	1	$referenceNode->appendChild($digestMethodNode);
141	1	$digestMethodNode->setAttribute('Algorithm', $nsDigestMethod);
142	1	$digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
143	1	$digestValueNode = $dom->createElement('DigestValue', $digestValue);
144	1	$referenceNode->appendChild($digestValueNode);
145	1	$c14n = self::canonize($signedInfoNode, $canonical);
146	1	$signature = $certificate->sign($c14n, $algorithm);
147	1	$signatureValue = base64_encode($signature);
148	1	$signatureValueNode = $dom->createElement('SignatureValue', $signatureValue);
149	1	$signatureNode->appendChild($signatureValueNode);
150	1	$keyInfoNode = $dom->createElement('KeyInfo');
151	1	$signatureNode->appendChild($keyInfoNode);
152	1	$x509DataNode = $dom->createElement('X509Data');
153	1	$keyInfoNode->appendChild($x509DataNode);
154	1	$pubKeyClean = $certificate->publicKey->unFormated();
155	1	$x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
156	1	$x509DataNode->appendChild($x509CertificateNode);
157	1	return $dom;
158		}
159
160		/**
161		* Remove old signature from document to replace it
162		* @param string $content
163		* @return string
164		*/
165	1	public static function removeSignature($content)
166		{
167	1	if (! self::existsSignature($content)) {
168		return $content;
169		}
170	1	$dom = new \DOMDocument('1.0', 'utf-8');
171	1	$dom->formatOutput = false;
172	1	$dom->preserveWhiteSpace = false;
173	1	$dom->loadXML($content);
174	1	$node = $dom->documentElement;
175	1	$signature = $node->getElementsByTagName('Signature')->item(0);
176	1	if (!empty($signature)) {
177	1	$parent = $signature->parentNode;
178	1	$parent->removeChild($signature);
179		}
180	1	return $dom->saveXML();
181		}
182
183		/**
184		* Verify if xml signature is valid
185		* @param string $content
186		* @param string $tagname tag for sign (opcional)
187		* @param array $canonical parameters to format node for signature (opcional)
188		* @return boolean
189		* @throws SignerException Not is a XML, Digest or Signature dont match
190		*/
191	6	public static function isSigned(
192		$content,
193		$tagname = '',
194		$canonical = self::CANONICAL
195		) {
196	6	if (self::existsSignature($content)) {
197	5	if (self::digestCheck($content, $tagname, $canonical)) {
198	3	if (self::signatureCheck($content, $canonical)) {
199	2	return true;
200		}
201		}
202		}
203	1	return false;
204		}
205
206		/**
207		* Check if Signature tag already exists
208		* @param string $content
209		* @return boolean
210		*/
211	6	public static function existsSignature($content)
212		{
213	6	if (! Validator::isXML($content)) {
214		throw SignerException::isNotXml();
215		}
216	6	$dom = new \DOMDocument('1.0', 'utf-8');
217	6	$dom->formatOutput = false;
218	6	$dom->preserveWhiteSpace = false;
219	6	$dom->loadXML($content);
220	6	$signature = $dom->getElementsByTagName('Signature')->item(0);
221	6	if (empty($signature)) {
222	2	return false;
223		}
224	6	return true;
225		}
226
227		/**
228		* Verify signature value from SignatureInfo node and public key
229		* @param string $xml
230		* @param array $canonical
231		* @return boolean
232		*/
233	3	public static function signatureCheck(
234		$xml,
235		$canonical = self::CANONICAL
236		) {
237	3	$dom = new \DOMDocument('1.0', 'utf-8');
238	3	$dom->formatOutput = false;
239	3	$dom->preserveWhiteSpace = false;
240	3	$dom->loadXML($xml);
241
242	3	$signature = $dom->getElementsByTagName('Signature')->item(0);
243	3	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')
244	3	->item(0)->getAttribute('Algorithm');
245	3	$algorithm = OPENSSL_ALGO_SHA256;
246	3	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
247	3	$algorithm = OPENSSL_ALGO_SHA1;
248		}
249	3	$certificateContent = $signature->getElementsByTagName('X509Certificate')
250	3	->item(0)->nodeValue;
251	3	$publicKey = PublicKey::createFromContent($certificateContent);
252	3	$signInfoNode = self::canonize(
253	3	$signature->getElementsByTagName('SignedInfo')->item(0),
254		$canonical
255		);
256	3	$signatureValue = $signature->getElementsByTagName('SignatureValue')
257	3	->item(0)->nodeValue;
258	3	$decodedSignature = base64_decode(
259	3	str_replace(array("\r", "\n"), '', $signatureValue)
260		);
261	3	if (! $publicKey->verify($signInfoNode, $decodedSignature, $algorithm)) {
262	1	throw SignerException::signatureComparisonFailed();
263		}
264	2	return true;
265		}
266
267		/**
268		* Verify digest value of data node
269		* @param string $xml
270		* @param string $tagname
271		* @param array $canonical
272		* @return bool
273		* @throws SignerException
274		*/
275	5	public static function digestCheck(
276		$xml,
277		$tagname = '',
278		$canonical = self::CANONICAL
279		) {
280	5	$dom = new \DOMDocument('1.0', 'utf-8');
281	5	$dom->formatOutput = false;
282	5	$dom->preserveWhiteSpace = false;
283	5	$dom->loadXML($xml);
284	5	$root = $dom->documentElement;
285	5	$signature = $dom->getElementsByTagName('Signature')->item(0);
286	5	$sigURI = $signature->getElementsByTagName('Reference')
287	5	->item(0)
288	5	->getAttribute('URI');
289	5	if (empty($tagname)) {
290	4	if (empty($sigURI)) {
291		$tagname = $root->nodeName;
292		} else {
293	4	$xpath = new \DOMXPath($dom);
294	4	$entries = $xpath->query('//@Id');
295	4	foreach ($entries as $entry) {
296	4	$tagname = $entry->ownerElement->nodeName;
297	4	break;
298		}
299		}
300		}
301	5	$node = $dom->getElementsByTagName($tagname)->item(0);
302	5	if (empty($node)) {
303	1	throw SignerException::tagNotFound($tagname);
304		}
305	4	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')
306	4	->item(0)
307	4	->getAttribute('Algorithm');
308	4	$algorithm = 'sha256';
309	4	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
310	4	$algorithm = 'sha1';
311		}
312	4	if ($sigURI == '') {
313		$node->removeChild($signature);
314		}
315	4	$calculatedDigest = self::makeDigest($node, $algorithm, $canonical);
316	4	$informedDigest = $signature->getElementsByTagName('DigestValue')
317	4	->item(0)
318	4	->nodeValue;
319	4	if ($calculatedDigest != $informedDigest) {
320	1	throw SignerException::digestComparisonFailed();
321		}
322	3	return true;
323		}
324
325		/**
326		* Calculate digest value for given node
327		* @param DOMNode $node
328		* @param string $algorithm
329		* @param array $canonical
330		* @return string
331		*/
332	4	private static function makeDigest(
333		DOMNode $node,
334		$algorithm,
335		$canonical = self::CANONICAL
336		) {
337		//calcular o hash dos dados
338	4	$c14n = self::canonize($node, $canonical);
339	4	$hashValue = hash($algorithm, $c14n, true);
340	4	return base64_encode($hashValue);
341		}
342
343		/**
344		* Reduced to the canonical form
345		* @param DOMNode $node
346		* @param array $canonical
347		* @return string
348		*/
349	4	private static function canonize(
350		DOMNode $node,
351		$canonical = self::CANONICAL
352		) {
353	4	return $node->C14N(
354	4	$canonical[0],
355	4	$canonical[1],
356	4	$canonical[2],
357	4	$canonical[3]
358		);
359		}
360		}
361

nfephp-org / sped-common

Pull Request — master (#181)

Signer::canonize() A

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