LingotekOAuthSignatureMethod_RSA_SHA1.php in Lingotek Translation 7.6

File

lib/oauth-php/library/signature_method/LingotekOAuthSignatureMethod_RSA_SHA1.php

<?php

/**
 * OAuth signature implementation using PLAINTEXT
 * 
 * @version $Id$
 * @author Marc Worrell <[e-mail]>
 * @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.
 */
require_once dirname(__FILE__) . '/LingotekOAuthSignatureMethod.class.php';
class LingotekOAuthSignatureMethod_RSA_SHA1 extends LingotekOAuthSignatureMethod {
  public function name() {
    return 'RSA-SHA1';
  }

  /**
   * Fetch the public CERT key for the signature
   *
   * @param LingotekOAuthRequest 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 OAuthException2("LingotekOAuthSignatureMethod_RSA_SHA1::fetch_public_cert not implemented");
  }

  /**
   * Fetch the private CERT key for the signature
   *
   * @param LingotekOAuthRequest 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 OAuthException2("LingotekOAuthSignatureMethod_RSA_SHA1::fetch_private_cert not implemented");
  }

  /**
   * Calculate the signature using RSA-SHA1
   * This function is copyright Andy Smith, 2008.
   *
   * @param LingotekOAuthRequest 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 LingotekOAuthRequest 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: */

Classes

Name	Description
LingotekOAuthSignatureMethod_RSA_SHA1