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<?php
/**
* OAuth signature implementation using PLAINTEXT
*
* @version $Id$
* @author Marc Worrell <marcw@pobox.com>
* @date Sep 8, 2008 12:00:14 PM
*
* The MIT License
*
* Copyright (c) 2007-2008 Mediamatic Lab
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod
{
public function name()
{
return 'RSA-SHA1';
}
/**
* Fetch the public CERT key for the signature
*
* @param OAuthRequest request
* @return string public key
*/
protected function fetch_public_cert ( $request )
{
// not implemented yet, ideas are:
// (1) do a lookup in a table of trusted certs keyed off of consumer
// (2) fetch via http using a url provided by the requester
// (3) some sort of specific discovery code based on request
//
// either way should return a string representation of the certificate
throw OAuthException("OAuthSignatureMethod_RSA_SHA1::fetch_public_cert not implemented");
}
/**
* Fetch the private CERT key for the signature
*
* @param OAuthRequest request
* @return string private key
*/
protected function fetch_private_cert ( $request )
{
// not implemented yet, ideas are:
// (1) do a lookup in a table of trusted certs keyed off of consumer
//
// either way should return a string representation of the certificate
throw OAuthException("OAuthSignatureMethod_RSA_SHA1::fetch_private_cert not implemented");
}
/**
* Calculate the signature using RSA-SHA1
* This function is copyright Andy Smith, 2008.
*
* @param OAuthRequest request
* @param string base_string
* @param string consumer_secret
* @param string token_secret
* @return string
*/
public function signature ( $request, $base_string, $consumer_secret, $token_secret )
{
// Fetch the private key cert based on the request
$cert = $this->fetch_private_cert($request);
// Pull the private key ID from the certificate
$privatekeyid = openssl_get_privatekey($cert);
// Sign using the key
$sig = false;
$ok = openssl_sign($base_string, $sig, $privatekeyid);
// Release the key resource
openssl_free_key($privatekeyid);
return $request->urlencode(base64_encode($sig));
}
/**
* Check if the request signature is the same as the one calculated for the request.
*
* @param OAuthRequest request
* @param string base_string
* @param string consumer_secret
* @param string token_secret
* @param string signature
* @return string
*/
public function verify ( $request, $base_string, $consumer_secret, $token_secret, $signature )
{
$decoded_sig = base64_decode($request->urldecode($signature));
// Fetch the public key cert based on the request
$cert = $this->fetch_public_cert($request);
// Pull the public key ID from the certificate
$publickeyid = openssl_get_publickey($cert);
// Check the computed signature against the one passed in the query
$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
// Release the key resource
openssl_free_key($publickeyid);
return $ok == 1;
}
}
/* vi:set ts=4 sts=4 sw=4 binary noeol: */
?>
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