Hmac.php

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<?php
#require_once 'Zend/Oauth/Signature/SignatureAbstract.php';

#require_once 'Zend/Crypt/Hmac.php';

class Zend_Oauth_Signature_Hmac extends Zend_Oauth_Signature_SignatureAbstract
{
    public function sign(array $params, $method = null, $url = null)
    {
        $binaryHash = Zend_Crypt_Hmac::compute(
            $this->_key,
            $this->_hashAlgorithm,
            $this->_getBaseSignatureString($params, $method, $url),
            Zend_Crypt_Hmac::BINARY
        );
        return base64_encode($binaryHash);
    }
}