68 lines
1.7 KiB
PHP
68 lines
1.7 KiB
PHP
<?php
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/*!
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* This file is part of the OAuth PHP Library (https://code.google.com/p/oauth/)
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*
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* OAuth `PHP' Library is an open source software available under the MIT License.
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*/
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namespace Hybridauth\Thirdparty\OAuth;
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/**
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* Class OAuthSignatureMethod
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*
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* @package Hybridauth\Thirdparty\OAuth
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*/
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abstract class OAuthSignatureMethod
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{
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/**
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* Needs to return the name of the Signature Method (ie HMAC-SHA1)
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*
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* @return string
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*/
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abstract public function get_name();
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/**
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* Build up the signature
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* NOTE: The output of this function MUST NOT be urlencoded.
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* the encoding is handled in OAuthRequest when the final
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* request is serialized
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*
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* @param OAuthRequest $request
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* @param OAuthConsumer $consumer
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* @param OAuthToken $token
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* @return string
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*/
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abstract public function build_signature($request, $consumer, $token);
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/**
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* Verifies that a given signature is correct
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*
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* @param OAuthRequest $request
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* @param OAuthConsumer $consumer
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* @param OAuthToken $token
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* @param string $signature
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* @return bool
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*/
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public function check_signature($request, $consumer, $token, $signature)
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{
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$built = $this->build_signature($request, $consumer, $token);
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// Check for zero length, although unlikely here
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if (strlen($built) == 0 || strlen($signature) == 0) {
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return false;
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}
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if (strlen($built) != strlen($signature)) {
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return false;
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}
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// Avoid a timing leak with a (hopefully) time insensitive compare
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$result = 0;
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for ($i = 0; $i < strlen($signature); $i ++) {
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$result |= ord($built[$i]) ^ ord($signature[$i]);
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}
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return $result == 0;
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}
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}
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