<?php 
namespace Aws; 
 
/** 
 * Interface that allows implementing various incremental hashes. 
 */ 
interface HashInterface 
{ 
    /** 
     * Adds data to the hash. 
     * 
     * @param string $data Data to add to the hash 
     */ 
    public function update($data); 
 
    /** 
     * Finalizes the incremental hash and returns the resulting digest. 
     * 
     * @return string 
     */ 
    public function complete(); 
 
    /** 
     * Removes all data from the hash, effectively starting a new hash. 
     */ 
    public function reset(); 
} 
 
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