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<?php

namespace Gaufrette\Adapter;

/**
 * Interface which add checksum calculation support to adapter.
 *
 * @author Leszek Prabucki <[email protected]>
 */
interface ChecksumCalculator
{
    /**
     * Returns the checksum of the specified key.
     *
     * @param string $key
     *
     * @return string
     */
    public function checksum($key);
}