Signer::makeDigest() - Code Metrics - Inspection of "Merge pull request #167 from robmachado/master" - nfephp-org/sped-common - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — master ( e62ad0...8c869c )

by Roberto

created 2018-03-28 20:23 UTC

Signer::makeDigest() A

↳ Parent: Signer

Complexity

Conditions	1
Paths	1

Size

Total Lines	10
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	1

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	0
loc	10
ccs	4
cts	4
cp	1
rs	9.4285
cc	1
eloc	7
nc	1
nop	3
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
{
    private static $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 = [true,false,null,null],
        $rootname = ''
    ) {
        if (!empty($canonical)) {
            self::$canonical = $canonical;
        }
        if (empty($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;
        $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
            );
        };
        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 \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 = [true,false,null,null]
    ) {
        $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);
        $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 = '',
        $canonical = [true,false,null,null]
    ) {
        if (self::existsSignature($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 = [true,false,null,null]
    ) {
        $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 = [true,false,null,null]
    ) {
        $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 = [true,false,null,null]
    ) {
        //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 = [true,false,null,null]
    ) {
        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		private static $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 = [true,false,null,null],
56		$rootname = ''
57		) {
58	2	if (!empty($canonical)) {
59	2	self::$canonical = $canonical;
60		}
61	2	if (empty($content)) {
62		throw SignerException::isNotXml();
63		}
64	2	if (! Validator::isXML($content)) {
65	1	throw SignerException::isNotXml();
66		}
67	1	$dom = new DOMDocument('1.0', 'UTF-8');
68	1	$dom->loadXML($content);
69	1	$dom->preserveWhiteSpace = false;
70	1	$dom->formatOutput = false;
71	1	$root = $dom->documentElement;
72	1	if (!empty($rootname)) {
73		$root = $dom->getElementsByTagName($rootname)->item(0);
74		}
75	1	$node = $dom->getElementsByTagName($tagname)->item(0);
76	1	if (empty($node) \|\| empty($root)) {
77		throw SignerException::tagNotFound($tagname);
78		}
79	1	if (! self::existsSignature($content)) {
80	1	$dom = self::createSignature(
81		$certificate,
82		$dom,
83		$root,
84		$node,
		0 ignored issues – show Compatibility introduced 2017-04-29 14:39 UTC by Report Bug Copy Issue Report `$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...
85		$mark,
86		$algorithm,
87		$canonical
88		);
89		};
90		return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
91	1	. $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL);
92		}
93
94		/**
95		* Method that provides the signature of xml as standard SEFAZ
96		* @param Certificate $certificate
97		* @param \DOMDocument $dom
98		* @param \DOMNode $root xml root
99		* @param \DOMElement $node node to be signed
100		* @param string $mark Marker signed attribute
101		* @param int $algorithm cryptographic algorithm (opcional)
102		* @param array $canonical parameters to format node for signature (opcional)
103		* @return \DOMDocument
104		*/
105	1	private static function createSignature(
106		Certificate $certificate,
107		DOMDocument $dom,
108		DOMNode $root,
109		DOMElement $node,
110		$mark,
111		$algorithm = OPENSSL_ALGO_SHA1,
112		$canonical = [true,false,null,null]
113		) {
114	1	$nsDSIG = 'http://www.w3.org/2000/09/xmldsig#';
115	1	$nsCannonMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
116	1	$nsSignatureMethod = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
117	1	$nsDigestMethod = 'http://www.w3.org/2000/09/xmldsig#sha1';
118	1	$digestAlgorithm = 'sha1';
119	1	if ($algorithm == OPENSSL_ALGO_SHA256) {
120		$digestAlgorithm = 'sha256';
121		$nsSignatureMethod = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
122		$nsDigestMethod = 'http://www.w3.org/2001/04/xmlenc#sha256';
123		}
124	1	$nsTransformMethod1 ='http://www.w3.org/2000/09/xmldsig#enveloped-signature';
125	1	$nsTransformMethod2 = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
126	1	$idSigned = trim($node->getAttribute($mark));
127	1	$digestValue = self::makeDigest($node, $digestAlgorithm, $canonical);
128	1	$signatureNode = $dom->createElementNS($nsDSIG, 'Signature');
129	1	$root->appendChild($signatureNode);
130	1	$signedInfoNode = $dom->createElement('SignedInfo');
131	1	$signatureNode->appendChild($signedInfoNode);
132	1	$canonicalNode = $dom->createElement('CanonicalizationMethod');
133	1	$signedInfoNode->appendChild($canonicalNode);
134	1	$canonicalNode->setAttribute('Algorithm', $nsCannonMethod);
135	1	$signatureMethodNode = $dom->createElement('SignatureMethod');
136	1	$signedInfoNode->appendChild($signatureMethodNode);
137	1	$signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod);
138	1	$referenceNode = $dom->createElement('Reference');
139	1	$signedInfoNode->appendChild($referenceNode);
140	1	if (!empty($idSigned)) {
141	1	$idSigned = "#$idSigned";
142		}
143	1	$referenceNode->setAttribute('URI', $idSigned);
144	1	$transformsNode = $dom->createElement('Transforms');
145	1	$referenceNode->appendChild($transformsNode);
146	1	$transfNode1 = $dom->createElement('Transform');
147	1	$transformsNode->appendChild($transfNode1);
148	1	$transfNode1->setAttribute('Algorithm', $nsTransformMethod1);
149	1	$transfNode2 = $dom->createElement('Transform');
150	1	$transformsNode->appendChild($transfNode2);
151	1	$transfNode2->setAttribute('Algorithm', $nsTransformMethod2);
152	1	$digestMethodNode = $dom->createElement('DigestMethod');
153	1	$referenceNode->appendChild($digestMethodNode);
154	1	$digestMethodNode->setAttribute('Algorithm', $nsDigestMethod);
155	1	$digestValueNode = $dom->createElement('DigestValue', $digestValue);
156	1	$referenceNode->appendChild($digestValueNode);
157	1	$c14n = self::canonize($signedInfoNode, $canonical);
158	1	$signature = $certificate->sign($c14n, $algorithm);
159	1	$signatureValue = base64_encode($signature);
160	1	$signatureValueNode = $dom->createElement('SignatureValue', $signatureValue);
161	1	$signatureNode->appendChild($signatureValueNode);
162	1	$keyInfoNode = $dom->createElement('KeyInfo');
163	1	$signatureNode->appendChild($keyInfoNode);
164	1	$x509DataNode = $dom->createElement('X509Data');
165	1	$keyInfoNode->appendChild($x509DataNode);
166	1	$pubKeyClean = $certificate->publicKey->unFormated();
167	1	$x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean);
168	1	$x509DataNode->appendChild($x509CertificateNode);
169	1	return $dom;
170		}
171
172		/**
173		* Remove old signature from document to replace it
174		* @param string $content
175		* @return string
176		*/
177	1	public static function removeSignature($content)
178		{
179	1	if (! self::existsSignature($content)) {
180		return $content;
181		}
182	1	$dom = new \DOMDocument('1.0', 'utf-8');
183	1	$dom->formatOutput = false;
184	1	$dom->preserveWhiteSpace = false;
185	1	$dom->loadXML($content);
186	1	$node = $dom->documentElement;
187	1	$signature = $node->getElementsByTagName('Signature')->item(0);
188	1	if (!empty($signature)) {
189	1	$parent = $signature->parentNode;
190	1	$parent->removeChild($signature);
191		}
192	1	return $dom->saveXML();
193		}
194
195		/**
196		* Verify if xml signature is valid
197		* @param string $content
198		* @param string $tagname tag for sign (opcional)
199		* @param array $canonical parameters to format node for signature (opcional)
200		* @return boolean
201		* @throws SignerException Not is a XML, Digest or Signature dont match
202		*/
203	6	public static function isSigned(
204		$content,
205		$tagname = '',
206		$canonical = [true,false,null,null]
207		) {
208	6	if (self::existsSignature($content)) {
209	5	if (self::digestCheck($content, $tagname, $canonical)) {
210	3	if (self::signatureCheck($content, $canonical)) {
211	2	return true;
212		}
213		}
214		}
215	1	return false;
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 = $dom->getElementsByTagName('Signature')->item(0);
233	6	if (empty($signature)) {
234	2	return false;
235		}
236	6	return true;
237		}
238
239		/**
240		* Verify signature value from SignatureInfo node and public key
241		* @param string $xml
242		* @param array $canonical
243		* @return boolean
244		*/
245	3	public static function signatureCheck(
246		$xml,
247		$canonical = [true,false,null,null]
248		) {
249	3	$dom = new \DOMDocument('1.0', 'utf-8');
250	3	$dom->formatOutput = false;
251	3	$dom->preserveWhiteSpace = false;
252	3	$dom->loadXML($xml);
253
254	3	$signature = $dom->getElementsByTagName('Signature')->item(0);
255	3	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')
256	3	->item(0)->getAttribute('Algorithm');
257	3	$algorithm = OPENSSL_ALGO_SHA256;
258	3	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
259	3	$algorithm = OPENSSL_ALGO_SHA1;
260		}
261	3	$certificateContent = $signature->getElementsByTagName('X509Certificate')
262	3	->item(0)->nodeValue;
263	3	$publicKey = PublicKey::createFromContent($certificateContent);
264	3	$signInfoNode = self::canonize(
265	3	$signature->getElementsByTagName('SignedInfo')->item(0),
266		$canonical
267		);
268	3	$signatureValue = $signature->getElementsByTagName('SignatureValue')
269	3	->item(0)->nodeValue;
270	3	$decodedSignature = base64_decode(
271	3	str_replace(array("\r", "\n"), '', $signatureValue)
272		);
273	3	if (! $publicKey->verify($signInfoNode, $decodedSignature, $algorithm)) {
274	1	throw SignerException::signatureComparisonFailed();
275		}
276	2	return true;
277		}
278
279		/**
280		* Verify digest value of data node
281		* @param string $xml
282		* @param string $tagname
283		* @param array $canonical
284		* @return bool
285		* @throws SignerException
286		*/
287	5	public static function digestCheck(
288		$xml,
289		$tagname = '',
290		$canonical = [true,false,null,null]
291		) {
292	5	$dom = new \DOMDocument('1.0', 'utf-8');
293	5	$dom->formatOutput = false;
294	5	$dom->preserveWhiteSpace = false;
295	5	$dom->loadXML($xml);
296	5	$root = $dom->documentElement;
297	5	$signature = $dom->getElementsByTagName('Signature')->item(0);
298	5	$sigURI = $signature->getElementsByTagName('Reference')
299	5	->item(0)
300	5	->getAttribute('URI');
301	5	if (empty($tagname)) {
302	4	if (empty($sigURI)) {
303		$tagname = $root->nodeName;
304		} else {
305	4	$xpath = new \DOMXPath($dom);
306	4	$entries = $xpath->query('//@Id');
307	4	foreach ($entries as $entry) {
308	4	$tagname = $entry->ownerElement->nodeName;
309	4	break;
310		}
311		}
312		}
313	5	$node = $dom->getElementsByTagName($tagname)->item(0);
314	5	if (empty($node)) {
315	1	throw SignerException::tagNotFound($tagname);
316		}
317	4	$sigMethAlgo = $signature->getElementsByTagName('SignatureMethod')
318	4	->item(0)
319	4	->getAttribute('Algorithm');
320	4	$algorithm = 'sha256';
321	4	if ($sigMethAlgo == 'http://www.w3.org/2000/09/xmldsig#rsa-sha1') {
322	4	$algorithm = 'sha1';
323		}
324	4	if ($sigURI == '') {
325		$node->removeChild($signature);
326		}
327	4	$calculatedDigest = self::makeDigest($node, $algorithm, $canonical);
328	4	$informedDigest = $signature->getElementsByTagName('DigestValue')
329	4	->item(0)
330	4	->nodeValue;
331	4	if ($calculatedDigest != $informedDigest) {
332	1	throw SignerException::digestComparisonFailed();
333		}
334	3	return true;
335		}
336
337		/**
338		* Calculate digest value for given node
339		* @param DOMNode $node
340		* @param string $algorithm
341		* @param array $canonical
342		* @return string
343		*/
344	4	private static function makeDigest(
345		DOMNode $node,
346		$algorithm,
347		$canonical = [true,false,null,null]
348		) {
349		//calcular o hash dos dados
350	4	$c14n = self::canonize($node, $canonical);
351	4	$hashValue = hash($algorithm, $c14n, true);
352	4	return base64_encode($hashValue);
353		}
354
355		/**
356		* Reduced to the canonical form
357		* @param DOMNode $node
358		* @param array $canonical
359		* @return string
360		*/
361	4	private static function canonize(
362		DOMNode $node,
363		$canonical = [true,false,null,null]
364		) {
365	4	return $node->C14N(
366	4	$canonical[0],
367	4	$canonical[1],
368	4	$canonical[2],
369	4	$canonical[3]
370		);
371		}
372		}
373

nfephp-org / sped-common

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Signer::makeDigest() A

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