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milfskleper/toa/src/SignatureMethod.php

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<?php
/**
* The MIT License
* Copyright (c) 2007 Andy Smith
*/
namespace Abraham\TwitterOAuth;
/**
* A class for implementing a Signature Method
* See section 9 ("Signing Requests") in the spec
*/
abstract class SignatureMethod
{
/**
* Needs to return the name of the Signature Method (ie HMAC-SHA1)
*
* @return string
*/
abstract public function getName();
/**
* 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 Request $request
* @param Consumer $consumer
* @param Token $token
*
* @return string
*/
abstract public function buildSignature(Request $request, Consumer $consumer, Token $token = null);
/**
* Verifies that a given signature is correct
*
* @param Request $request
* @param Consumer $consumer
* @param Token $token
* @param string $signature
*
* @return bool
*/
public function checkSignature(Request $request, Consumer $consumer, Token $token, $signature)
{
$built = $this->buildSignature($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;
}
}