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xmlseclibs.php
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<?php
/**
* xmlseclibs.php
*
* Copyright (c) 2007-2013, Robert Richards <rrichards@cdatazone.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Robert Richards nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @author Robert Richards <rrichards@cdatazone.org>
* @copyright 2007-2013 Robert Richards <rrichards@cdatazone.org>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version 1.3.1
*/
/*
Functions to generate simple cases of Exclusive Canonical XML - Callable function is C14NGeneral()
i.e.: $canonical = C14NGeneral($domelement, TRUE);
*/
/* helper function */
function sortAndAddAttrs($element, $arAtts) {
$newAtts = array();
foreach ($arAtts AS $attnode) {
$newAtts[$attnode->nodeName] = $attnode;
}
ksort($newAtts);
foreach ($newAtts as $attnode) {
$element->setAttribute($attnode->nodeName, $attnode->nodeValue);
}
}
/* helper function */
function canonical($tree, $element, $withcomments) {
if ($tree->nodeType != XML_DOCUMENT_NODE) {
$dom = $tree->ownerDocument;
} else {
$dom = $tree;
}
if ($element->nodeType != XML_ELEMENT_NODE) {
if ($element->nodeType == XML_DOCUMENT_NODE) {
foreach ($element->childNodes AS $node) {
canonical($dom, $node, $withcomments);
}
return;
}
if ($element->nodeType == XML_COMMENT_NODE && ! $withcomments) {
return;
}
$tree->appendChild($dom->importNode($element, TRUE));
return;
}
$arNS = array();
if ($element->namespaceURI != "") {
if ($element->prefix == "") {
$elCopy = $dom->createElementNS($element->namespaceURI, $element->nodeName);
} else {
$prefix = $tree->lookupPrefix($element->namespaceURI);
if ($prefix == $element->prefix) {
$elCopy = $dom->createElementNS($element->namespaceURI, $element->nodeName);
} else {
$elCopy = $dom->createElement($element->nodeName);
$arNS[$element->namespaceURI] = $element->prefix;
}
}
} else {
$elCopy = $dom->createElement($element->nodeName);
}
$tree->appendChild($elCopy);
/* Create DOMXPath based on original document */
$xPath = new DOMXPath($element->ownerDocument);
/* Get namespaced attributes */
$arAtts = $xPath->query('attribute::*[namespace-uri(.) != ""]', $element);
/* Create an array with namespace URIs as keys, and sort them */
foreach ($arAtts AS $attnode) {
if (array_key_exists($attnode->namespaceURI, $arNS) &&
($arNS[$attnode->namespaceURI] == $attnode->prefix)) {
continue;
}
$prefix = $tree->lookupPrefix($attnode->namespaceURI);
if ($prefix != $attnode->prefix) {
$arNS[$attnode->namespaceURI] = $attnode->prefix;
} else {
$arNS[$attnode->namespaceURI] = NULL;
}
}
if (count($arNS) > 0) {
asort($arNS);
}
/* Add namespace nodes */
foreach ($arNS AS $namespaceURI=>$prefix) {
if ($prefix != NULL) {
$elCopy->setAttributeNS("http://www.w3.org/2000/xmlns/",
"xmlns:".$prefix, $namespaceURI);
}
}
if (count($arNS) > 0) {
ksort($arNS);
}
/* Get attributes not in a namespace, and then sort and add them */
$arAtts = $xPath->query('attribute::*[namespace-uri(.) = ""]', $element);
sortAndAddAttrs($elCopy, $arAtts);
/* Loop through the URIs, and then sort and add attributes within that namespace */
foreach ($arNS as $nsURI=>$prefix) {
$arAtts = $xPath->query('attribute::*[namespace-uri(.) = "'.$nsURI.'"]', $element);
sortAndAddAttrs($elCopy, $arAtts);
}
foreach ($element->childNodes AS $node) {
canonical($elCopy, $node, $withcomments);
}
}
/*
$element - DOMElement for which to produce the canonical version of
$exclusive - boolean to indicate exclusive canonicalization (must pass TRUE)
$withcomments - boolean indicating wether or not to include comments in canonicalized form
*/
function C14NGeneral($element, $exclusive=FALSE, $withcomments=FALSE) {
/* IF PHP 5.2+ then use built in canonical functionality */
$php_version = explode('.', PHP_VERSION);
if (($php_version[0] > 5) || ($php_version[0] == 5 && $php_version[1] >= 2) ) {
return $element->C14N($exclusive, $withcomments);
}
/* Must be element or document */
if (! $element instanceof DOMElement && ! $element instanceof DOMDocument) {
return NULL;
}
/* Currently only exclusive XML is supported */
if ($exclusive == FALSE) {
throw new Exception("Only exclusive canonicalization is supported in this version of PHP");
}
$copyDoc = new DOMDocument();
canonical($copyDoc, $element, $withcomments);
return $copyDoc->saveXML($copyDoc->documentElement, LIBXML_NOEMPTYTAG);
}
class XMLSecurityKey {
const TRIPLEDES_CBC = 'http://www.w3.org/2001/04/xmlenc#tripledes-cbc';
const AES128_CBC = 'http://www.w3.org/2001/04/xmlenc#aes128-cbc';
const AES192_CBC = 'http://www.w3.org/2001/04/xmlenc#aes192-cbc';
const AES256_CBC = 'http://www.w3.org/2001/04/xmlenc#aes256-cbc';
const RSA_1_5 = 'http://www.w3.org/2001/04/xmlenc#rsa-1_5';
const RSA_OAEP_MGF1P = 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p';
const DSA_SHA1 = 'http://www.w3.org/2000/09/xmldsig#dsa-sha1';
const RSA_SHA1 = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
const RSA_SHA256 = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
const RSA_SHA384 = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha384';
const RSA_SHA512 = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha512';
private $cryptParams = array();
public $type = 0;
public $key = NULL;
public $passphrase = "";
public $iv = NULL;
public $name = NULL;
public $keyChain = NULL;
public $isEncrypted = FALSE;
public $encryptedCtx = NULL;
public $guid = NULL;
/**
* This variable contains the certificate as a string if this key represents an X509-certificate.
* If this key doesn't represent a certificate, this will be NULL.
*/
private $x509Certificate = NULL;
/* This variable contains the certificate thunbprint if we have loaded an X509-certificate. */
private $X509Thumbprint = NULL;
public function __construct($type, $params=NULL) {
srand();
switch ($type) {
case (XMLSecurityKey::TRIPLEDES_CBC):
$this->cryptParams['library'] = 'mcrypt';
$this->cryptParams['cipher'] = MCRYPT_TRIPLEDES;
$this->cryptParams['mode'] = MCRYPT_MODE_CBC;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#tripledes-cbc';
$this->cryptParams['keysize'] = 24;
break;
case (XMLSecurityKey::AES128_CBC):
$this->cryptParams['library'] = 'mcrypt';
$this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
$this->cryptParams['mode'] = MCRYPT_MODE_CBC;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes128-cbc';
$this->cryptParams['keysize'] = 16;
break;
case (XMLSecurityKey::AES192_CBC):
$this->cryptParams['library'] = 'mcrypt';
$this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
$this->cryptParams['mode'] = MCRYPT_MODE_CBC;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes192-cbc';
$this->cryptParams['keysize'] = 24;
break;
case (XMLSecurityKey::AES256_CBC):
$this->cryptParams['library'] = 'mcrypt';
$this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
$this->cryptParams['mode'] = MCRYPT_MODE_CBC;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes256-cbc';
$this->cryptParams['keysize'] = 32;
break;
case (XMLSecurityKey::RSA_1_5):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#rsa-1_5';
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
throw new Exception('Certificate "type" (private/public) must be passed via parameters');
return;
case (XMLSecurityKey::RSA_OAEP_MGF1P):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['padding'] = OPENSSL_PKCS1_OAEP_PADDING;
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p';
$this->cryptParams['hash'] = NULL;
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
throw new Exception('Certificate "type" (private/public) must be passed via parameters');
return;
case (XMLSecurityKey::RSA_SHA1):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['method'] = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
$this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
throw new Exception('Certificate "type" (private/public) must be passed via parameters');
break;
case (XMLSecurityKey::RSA_SHA256):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
$this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
$this->cryptParams['digest'] = 'SHA256';
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
throw new Exception('Certificate "type" (private/public) must be passed via parameters');
break;
case (XMLSecurityKey::RSA_SHA384):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha384';
$this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
$this->cryptParams['digest'] = 'SHA384';
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
case (XMLSecurityKey::RSA_SHA512):
$this->cryptParams['library'] = 'openssl';
$this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha512';
$this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
$this->cryptParams['digest'] = 'SHA512';
if (is_array($params) && ! empty($params['type'])) {
if ($params['type'] == 'public' || $params['type'] == 'private') {
$this->cryptParams['type'] = $params['type'];
break;
}
}
default:
throw new Exception('Invalid Key Type');
return;
}
$this->type = $type;
}
/**
* Retrieve the key size for the symmetric encryption algorithm..
*
* If the key size is unknown, or this isn't a symmetric encryption algorithm,
* NULL is returned.
*
* @return int|NULL The number of bytes in the key.
*/
public function getSymmetricKeySize() {
if (! isset($this->cryptParams['keysize'])) {
return NULL;
}
return $this->cryptParams['keysize'];
}
public function generateSessionKey() {
if (!isset($this->cryptParams['keysize'])) {
throw new Exception('Unknown key size for type "' . $this->type . '".');
}
$keysize = $this->cryptParams['keysize'];
if (function_exists('openssl_random_pseudo_bytes')) {
/* We have PHP >= 5.3 - use openssl to generate session key. */
$key = openssl_random_pseudo_bytes($keysize);
} else {
/* Generating random key using iv generation routines */
$key = mcrypt_create_iv($keysize, MCRYPT_RAND);
}
if ($this->type === XMLSecurityKey::TRIPLEDES_CBC) {
/* Make sure that the generated key has the proper parity bits set.
* Mcrypt doesn't care about the parity bits, but others may care.
*/
for ($i = 0; $i < strlen($key); $i++) {
$byte = ord($key[$i]) & 0xfe;
$parity = 1;
for ($j = 1; $j < 8; $j++) {
$parity ^= ($byte >> $j) & 1;
}
$byte |= $parity;
$key[$i] = chr($byte);
}
}
$this->key = $key;
return $key;
}
public static function getRawThumbprint($cert) {
$arCert = explode("\n", $cert);
$data = '';
$inData = FALSE;
foreach ($arCert AS $curData) {
if (! $inData) {
if (strncmp($curData, '-----BEGIN CERTIFICATE', 22) == 0) {
$inData = TRUE;
}
} else {
if (strncmp($curData, '-----END CERTIFICATE', 20) == 0) {
$inData = FALSE;
break;
}
$data .= trim($curData);
}
}
if (! empty($data)) {
return strtolower(sha1(base64_decode($data)));
}
return NULL;
}
public function loadKey($key, $isFile=FALSE, $isCert = FALSE) {
if ($isFile) {
$this->key = file_get_contents($key);
} else {
$this->key = $key;
}
if ($isCert) {
$this->key = openssl_x509_read($this->key);
openssl_x509_export($this->key, $str_cert);
$this->x509Certificate = $str_cert;
$this->key = $str_cert;
} else {
$this->x509Certificate = NULL;
}
if ($this->cryptParams['library'] == 'openssl') {
if ($this->cryptParams['type'] == 'public') {
if ($isCert) {
/* Load the thumbprint if this is an X509 certificate. */
$this->X509Thumbprint = self::getRawThumbprint($this->key);
}
$this->key = openssl_get_publickey($this->key);
} else {
$this->key = openssl_get_privatekey($this->key, $this->passphrase);
}
} else if ($this->cryptParams['cipher'] == MCRYPT_RIJNDAEL_128) {
/* Check key length */
switch ($this->type) {
case (XMLSecurityKey::AES256_CBC):
if (strlen($this->key) < 25) {
throw new Exception('Key must contain at least 25 characters for this cipher');
}
break;
case (XMLSecurityKey::AES192_CBC):
if (strlen($this->key) < 17) {
throw new Exception('Key must contain at least 17 characters for this cipher');
}
break;
}
}
}
private function encryptMcrypt($data) {
$td = mcrypt_module_open($this->cryptParams['cipher'], '', $this->cryptParams['mode'], '');
$this->iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $this->key, $this->iv);
if ($this->cryptParams['mode'] == MCRYPT_MODE_CBC) {
$bs = mcrypt_enc_get_block_size($td);
for ($datalen0=$datalen=strlen($data); (($datalen%$bs)!=($bs-1)); $datalen++)
$data.=chr(rand(1, 127));
$data.=chr($datalen-$datalen0+1);
}
$encrypted_data = $this->iv.mcrypt_generic($td, $data);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $encrypted_data;
}
private function decryptMcrypt($data) {
$td = mcrypt_module_open($this->cryptParams['cipher'], '', $this->cryptParams['mode'], '');
$iv_length = mcrypt_enc_get_iv_size($td);
$this->iv = substr($data, 0, $iv_length);
$data = substr($data, $iv_length);
mcrypt_generic_init($td, $this->key, $this->iv);
$decrypted_data = mdecrypt_generic($td, $data);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
if ($this->cryptParams['mode'] == MCRYPT_MODE_CBC) {
$dataLen = strlen($decrypted_data);
$paddingLength = substr($decrypted_data, $dataLen - 1, 1);
$decrypted_data = substr($decrypted_data, 0, $dataLen - ord($paddingLength));
}
return $decrypted_data;
}
private function encryptOpenSSL($data) {
if ($this->cryptParams['type'] == 'public') {
if (! openssl_public_encrypt($data, $encrypted_data, $this->key, $this->cryptParams['padding'])) {
throw new Exception('Failure encrypting Data');
return;
}
} else {
if (! openssl_private_encrypt($data, $encrypted_data, $this->key, $this->cryptParams['padding'])) {
throw new Exception('Failure encrypting Data');
return;
}
}
return $encrypted_data;
}
private function decryptOpenSSL($data) {
if ($this->cryptParams['type'] == 'public') {
if (! openssl_public_decrypt($data, $decrypted, $this->key, $this->cryptParams['padding'])) {
throw new Exception('Failure decrypting Data');
return;
}
} else {
if (! openssl_private_decrypt($data, $decrypted, $this->key, $this->cryptParams['padding'])) {
throw new Exception('Failure decrypting Data');
return;
}
}
return $decrypted;
}
private function signOpenSSL($data) {
$algo = OPENSSL_ALGO_SHA1;
if (! empty($this->cryptParams['digest'])) {
$algo = $this->cryptParams['digest'];
}
if (! openssl_sign ($data, $signature, $this->key, $algo)) {
throw new Exception('Failure Signing Data: ' . openssl_error_string() . ' - ' . $algo);
return;
}
return $signature;
}
private function verifyOpenSSL($data, $signature) {
$algo = OPENSSL_ALGO_SHA1;
if (! empty($this->cryptParams['digest'])) {
$algo = $this->cryptParams['digest'];
}
return openssl_verify ($data, $signature, $this->key, $algo);
}
public function encryptData($data) {
switch ($this->cryptParams['library']) {
case 'mcrypt':
return $this->encryptMcrypt($data);
break;
case 'openssl':
return $this->encryptOpenSSL($data);
break;
}
}
public function decryptData($data) {
switch ($this->cryptParams['library']) {
case 'mcrypt':
return $this->decryptMcrypt($data);
break;
case 'openssl':
return $this->decryptOpenSSL($data);
break;
}
}
public function signData($data) {
switch ($this->cryptParams['library']) {
case 'openssl':
return $this->signOpenSSL($data);
break;
}
}
public function verifySignature($data, $signature) {
switch ($this->cryptParams['library']) {
case 'openssl':
return $this->verifyOpenSSL($data, $signature);
break;
}
}
public function getAlgorith() {
return $this->cryptParams['method'];
}
static function makeAsnSegment($type, $string) {
switch ($type){
case 0x02:
if (ord($string) > 0x7f)
$string = chr(0).$string;
break;
case 0x03:
$string = chr(0).$string;
break;
}
$length = strlen($string);
if ($length < 128){
$output = sprintf("%c%c%s", $type, $length, $string);
} else if ($length < 0x0100){
$output = sprintf("%c%c%c%s", $type, 0x81, $length, $string);
} else if ($length < 0x010000) {
$output = sprintf("%c%c%c%c%s", $type, 0x82, $length/0x0100, $length%0x0100, $string);
} else {
$output = NULL;
}
return($output);
}
/* Modulus and Exponent must already be base64 decoded */
static function convertRSA($modulus, $exponent) {
/* make an ASN publicKeyInfo */
$exponentEncoding = XMLSecurityKey::makeAsnSegment(0x02, $exponent);
$modulusEncoding = XMLSecurityKey::makeAsnSegment(0x02, $modulus);
$sequenceEncoding = XMLSecurityKey:: makeAsnSegment(0x30, $modulusEncoding.$exponentEncoding);
$bitstringEncoding = XMLSecurityKey::makeAsnSegment(0x03, $sequenceEncoding);
$rsaAlgorithmIdentifier = pack("H*", "300D06092A864886F70D0101010500");
$publicKeyInfo = XMLSecurityKey::makeAsnSegment (0x30, $rsaAlgorithmIdentifier.$bitstringEncoding);
/* encode the publicKeyInfo in base64 and add PEM brackets */
$publicKeyInfoBase64 = base64_encode($publicKeyInfo);
$encoding = "-----BEGIN PUBLIC KEY-----\n";
$offset = 0;
while ($segment=substr($publicKeyInfoBase64, $offset, 64)){
$encoding = $encoding.$segment."\n";
$offset += 64;
}
return $encoding."-----END PUBLIC KEY-----\n";
}
public function serializeKey($parent) {
}
/**
* Retrieve the X509 certificate this key represents.
*
* Will return the X509 certificate in PEM-format if this key represents
* an X509 certificate.
*
* @return The X509 certificate or NULL if this key doesn't represent an X509-certificate.
*/
public function getX509Certificate() {
return $this->x509Certificate;
}
/* Get the thumbprint of this X509 certificate.
*
* Returns:
* The thumbprint as a lowercase 40-character hexadecimal number, or NULL
* if this isn't a X509 certificate.
*/
public function getX509Thumbprint() {
return $this->X509Thumbprint;
}
/**
* Create key from an EncryptedKey-element.
*
* @param DOMElement $element The EncryptedKey-element.
* @return XMLSecurityKey The new key.
*/
public static function fromEncryptedKeyElement(DOMElement $element) {
$objenc = new XMLSecEnc();
$objenc->setNode($element);
if (! $objKey = $objenc->locateKey()) {
throw new Exception("Unable to locate algorithm for this Encrypted Key");
}
$objKey->isEncrypted = TRUE;
$objKey->encryptedCtx = $objenc;
XMLSecEnc::staticLocateKeyInfo($objKey, $element);
return $objKey;
}
}
class XMLSecurityDSig {
const XMLDSIGNS = 'http://www.w3.org/2000/09/xmldsig#';
const SHA1 = 'http://www.w3.org/2000/09/xmldsig#sha1';
const SHA256 = 'http://www.w3.org/2001/04/xmlenc#sha256';
const SHA384 = 'http://www.w3.org/2001/04/xmldsig-more#sha384';
const SHA512 = 'http://www.w3.org/2001/04/xmlenc#sha512';
const RIPEMD160 = 'http://www.w3.org/2001/04/xmlenc#ripemd160';
const C14N = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
const C14N_COMMENTS = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments';
const EXC_C14N = 'http://www.w3.org/2001/10/xml-exc-c14n#';
const EXC_C14N_COMMENTS = 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments';
const template = '<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:SignedInfo>
<ds:SignatureMethod />
</ds:SignedInfo>
</ds:Signature>';
public $sigNode = NULL;
public $idKeys = array();
public $idNS = array();
private $signedInfo = NULL;
private $xPathCtx = NULL;
private $canonicalMethod = NULL;
private $prefix = 'ds';
private $searchpfx = 'secdsig';
/* This variable contains an associative array of validated nodes. */
private $validatedNodes = NULL;
public function __construct() {
$sigdoc = new DOMDocument();
$sigdoc->loadXML(XMLSecurityDSig::template);
$this->sigNode = $sigdoc->documentElement;
}
private function resetXPathObj() {
$this->xPathCtx = NULL;
}
private function getXPathObj() {
if (empty($this->xPathCtx) && ! empty($this->sigNode)) {
$xpath = new DOMXPath($this->sigNode->ownerDocument);
$xpath->registerNamespace('secdsig', XMLSecurityDSig::XMLDSIGNS);
$this->xPathCtx = $xpath;
}
return $this->xPathCtx;
}
static function generate_GUID($prefix='pfx') {
$uuid = md5(uniqid(rand(), true));
$guid = $prefix.substr($uuid,0,8)."-".
substr($uuid,8,4)."-".
substr($uuid,12,4)."-".
substr($uuid,16,4)."-".
substr($uuid,20,12);
return $guid;
}
public function locateSignature($objDoc) {
if ($objDoc instanceof DOMDocument) {
$doc = $objDoc;
} else {
$doc = $objDoc->ownerDocument;
}
if ($doc) {
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('secdsig', XMLSecurityDSig::XMLDSIGNS);
$query = ".//secdsig:Signature";
$nodeset = $xpath->query($query, $objDoc);
$this->sigNode = $nodeset->item(0);
return $this->sigNode;
}
return NULL;
}
public function createNewSignNode($name, $value=NULL) {
$doc = $this->sigNode->ownerDocument;
if (! is_null($value)) {
$node = $doc->createElementNS(XMLSecurityDSig::XMLDSIGNS, $this->prefix.':'.$name, $value);
} else {
$node = $doc->createElementNS(XMLSecurityDSig::XMLDSIGNS, $this->prefix.':'.$name);
}
return $node;
}
public function setCanonicalMethod($method) {
switch ($method) {
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
$this->canonicalMethod = $method;
break;
default:
throw new Exception('Invalid Canonical Method');
}
if ($xpath = $this->getXPathObj()) {
$query = './'.$this->searchpfx.':SignedInfo';
$nodeset = $xpath->query($query, $this->sigNode);
if ($sinfo = $nodeset->item(0)) {
$query = './'.$this->searchpfx.'CanonicalizationMethod';
$nodeset = $xpath->query($query, $sinfo);
if (! ($canonNode = $nodeset->item(0))) {
$canonNode = $this->createNewSignNode('CanonicalizationMethod');
$sinfo->insertBefore($canonNode, $sinfo->firstChild);
}
$canonNode->setAttribute('Algorithm', $this->canonicalMethod);
}
}
}
private function canonicalizeData($node, $canonicalmethod, $arXPath=NULL, $prefixList=NULL) {
$exclusive = FALSE;
$withComments = FALSE;
switch ($canonicalmethod) {
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
$exclusive = FALSE;
$withComments = FALSE;
break;
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
$withComments = TRUE;
break;
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
$exclusive = TRUE;
break;
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
$exclusive = TRUE;
$withComments = TRUE;
break;
}
/* Support PHP versions < 5.2 not containing C14N methods in DOM extension */
$php_version = explode('.', PHP_VERSION);
if (($php_version[0] < 5) || ($php_version[0] == 5 && $php_version[1] < 2) ) {
if (! is_null($arXPath)) {
throw new Exception("PHP 5.2.0 or higher is required to perform XPath Transformations");
}
return C14NGeneral($node, $exclusive, $withComments);
}
return $node->C14N($exclusive, $withComments, $arXPath, $prefixList);
}
public function canonicalizeSignedInfo() {
$doc = $this->sigNode->ownerDocument;
$canonicalmethod = NULL;
if ($doc) {
$xpath = $this->getXPathObj();
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($signInfoNode = $nodeset->item(0)) {
$query = "./secdsig:CanonicalizationMethod";
$nodeset = $xpath->query($query, $signInfoNode);
if ($canonNode = $nodeset->item(0)) {
$canonicalmethod = $canonNode->getAttribute('Algorithm');
}
$this->signedInfo = $this->canonicalizeData($signInfoNode, $canonicalmethod);
return $this->signedInfo;
}
}
return NULL;
}
public function calculateDigest ($digestAlgorithm, $data) {
switch ($digestAlgorithm) {
case XMLSecurityDSig::SHA1:
$alg = 'sha1';
break;
case XMLSecurityDSig::SHA256:
$alg = 'sha256';
break;
case XMLSecurityDSig::SHA384:
$alg = 'sha384';
break;
case XMLSecurityDSig::SHA512:
$alg = 'sha512';
break;
case XMLSecurityDSig::RIPEMD160:
$alg = 'ripemd160';
break;
default:
throw new Exception("Cannot validate digest: Unsupported Algorith <$digestAlgorithm>");
}
if (function_exists('hash')) {
return base64_encode(hash($alg, $data, TRUE));
} elseif (function_exists('mhash')) {
$alg = "MHASH_" . strtoupper($alg);
return base64_encode(mhash(constant($alg), $data));
} elseif ($alg === 'sha1') {
return base64_encode(sha1($data, TRUE));
} else {
throw new Exception('xmlseclibs is unable to calculate a digest. Maybe you need the mhash library?');
}
}
public function validateDigest($refNode, $data) {
$xpath = new DOMXPath($refNode->ownerDocument);
$xpath->registerNamespace('secdsig', XMLSecurityDSig::XMLDSIGNS);
$query = 'string(./secdsig:DigestMethod/@Algorithm)';
$digestAlgorithm = $xpath->evaluate($query, $refNode);
$digValue = $this->calculateDigest($digestAlgorithm, $data);
$query = 'string(./secdsig:DigestValue)';
$digestValue = $xpath->evaluate($query, $refNode);
return ($digValue == $digestValue);
}
public function processTransforms($refNode, $objData, $includeCommentNodes = TRUE) {
$data = $objData;
$xpath = new DOMXPath($refNode->ownerDocument);
$xpath->registerNamespace('secdsig', XMLSecurityDSig::XMLDSIGNS);
$query = './secdsig:Transforms/secdsig:Transform';
$nodelist = $xpath->query($query, $refNode);
$canonicalMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
$arXPath = NULL;
$prefixList = NULL;
foreach ($nodelist AS $transform) {
$algorithm = $transform->getAttribute("Algorithm");
switch ($algorithm) {
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
if(!$includeCommentNodes) {
/* We remove comment nodes by forcing it to use a canonicalization
* without comments.
*/
$canonicalMethod = 'http://www.w3.org/2001/10/xml-exc-c14n#';
} else {
$canonicalMethod = $algorithm;
}
$node = $transform->firstChild;
while ($node) {
if ($node->localName == 'InclusiveNamespaces') {
if ($pfx = $node->getAttribute('PrefixList')) {
$arpfx = array();
$pfxlist = explode(" ", $pfx);
foreach ($pfxlist AS $pfx) {
$val = trim($pfx);
if (! empty($val)) {
$arpfx[] = $val;
}
}
if (count($arpfx) > 0) {
$prefixList = $arpfx;
}
}
break;
}
$node = $node->nextSibling;
}
break;
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
if(!$includeCommentNodes) {
/* We remove comment nodes by forcing it to use a canonicalization
* without comments.
*/
$canonicalMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
} else {
$canonicalMethod = $algorithm;
}
break;
case 'http://www.w3.org/TR/1999/REC-xpath-19991116':
$node = $transform->firstChild;
while ($node) {
if ($node->localName == 'XPath') {
$arXPath = array();
$arXPath['query'] = '(.//. | .//@* | .//namespace::*)['.$node->nodeValue.']';
$arXpath['namespaces'] = array();
$nslist = $xpath->query('./namespace::*', $node);
foreach ($nslist AS $nsnode) {
if ($nsnode->localName != "xml") {
$arXPath['namespaces'][$nsnode->localName] = $nsnode->nodeValue;
}
}
break;
}
$node = $node->nextSibling;
}
break;
}
}
if ($data instanceof DOMNode) {
$data = $this->canonicalizeData($objData, $canonicalMethod, $arXPath, $prefixList);
}
return $data;
}
public function processRefNode($refNode) {
$dataObject = NULL;
/*
* Depending on the URI, we may not want to include comments in the result
* See: http://www.w3.org/TR/xmldsig-core/#sec-ReferenceProcessingModel
*/
$includeCommentNodes = TRUE;
if ($uri = $refNode->getAttribute("URI")) {
$arUrl = parse_url($uri);
if (empty($arUrl['path'])) {
if ($identifier = $arUrl['fragment']) {
/* This reference identifies a node with the given id by using
* a URI on the form "#identifier". This should not include comments.
*/
$includeCommentNodes = FALSE;
$xPath = new DOMXPath($refNode->ownerDocument);
if ($this->idNS && is_array($this->idNS)) {
foreach ($this->idNS AS $nspf=>$ns) {
$xPath->registerNamespace($nspf, $ns);
}
}
$iDlist = '@Id="'.$identifier.'"';
if (is_array($this->idKeys)) {
foreach ($this->idKeys AS $idKey) {
$iDlist .= " or @$idKey='$identifier'";
}
}
$query = '//*['.$iDlist.']';
$dataObject = $xPath->query($query)->item(0);
} else {
$dataObject = $refNode->ownerDocument;
}
} else {
$dataObject = file_get_contents($arUrl);
}
} else {
/* This reference identifies the root node with an empty URI. This should
* not include comments.
*/
$includeCommentNodes = FALSE;
$dataObject = $refNode->ownerDocument;
}
$data = $this->processTransforms($refNode, $dataObject, $includeCommentNodes);
if (!$this->validateDigest($refNode, $data)) {
return FALSE;
}
if ($dataObject instanceof DOMNode) {
/* Add this node to the list of validated nodes. */
if(! empty($identifier)) {
$this->validatedNodes[$identifier] = $dataObject;