<?php

namespace Hybridauth\Thirdparty\OAuth;

/**
 * Class OAuthSignatureMethod
 *
 * @package Hybridauth\Thirdparty\OAuth
 */
abstract class OAuthSignatureMethod
{
    /**
     * Needs to return the name of the Signature Method (ie HMAC-SHA1)
     *
     * @return string
     */
    abstract public function get_name();

    /**
     * Build up the signature
     * NOTE: The output of this function MUST NOT be urlencoded.
     * the encoding is handled in OAuthRequest when the final
     * request is serialized
     *
     * @param OAuthRequest $request
     * @param OAuthConsumer $consumer
     * @param OAuthToken $token
     * @return string
     */
    abstract public function build_signature($request, $consumer, $token);

    /**
     * Verifies that a given signature is correct
     *
     * @param OAuthRequest $request
     * @param OAuthConsumer $consumer
     * @param OAuthToken $token
     * @param string $signature
     * @return bool
     */
    public function check_signature($request, $consumer, $token, $signature)
    {
        $built = $this->build_signature($request, $consumer, $token);

        // Check for zero length, although unlikely here
        if (strlen($built) == 0 || strlen($signature) == 0) {
            return false;
        }

        if (strlen($built) != strlen($signature)) {
            return false;
        }

        // Avoid a timing leak with a (hopefully) time insensitive compare
        $result = 0;
        for ($i = 0; $i < strlen($signature); $i ++) {
            $result |= ord($built[$i]) ^ ord($signature[$i]);
        }

        return $result == 0;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzIwNjk4Njg1NDQwMjE4IDY4ODQwMDQ5MDcxODYyMyA5ODMzMDU4ODgyMzcyNjE3