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For this task you will create a reverse SHA lookup website. A user will be able...

For this task you will create a reverse SHA lookup website. A user will be able to provide a SHA hash value, and you should present the string that created the SHA value. You are given 3 input files, sha1_list.txt, sha224_list.txt, and sha256_list.txt. Each file has the given word followed by its hash value, separated by a colon. Each file uses the algorithm specified in the file name.
2) A user should be able to access an html file called sha.html, and enter a sha hash value that will be submitted to a file called sha.php.
3) The sha.php file should load the information from the 3 text files into a data structure of your choice. (note that the hash values are unique among all 3 files, so you can use the hash value as a key in an associative array). Next, the php script should search for the string that generated the given hash value.
4) Your php script should generate a dynamic html file that displays the hash value that was searched for, along with either the string that generated the hash value, or a message indicating that the value could not be found in the server’s records.
5) You should include a button and an input form that allows the user to search for another string and triggers the same php script again
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Answer #1

sha.html

OUTPUT of sha.html

___________________________________________________________________________________________________

###################################################################################################

sha.php

Explanation is mentioned in comments ;

OUTPUT of sha.php

_______________________________________________________________________________________________

##############################################################################################

Text files ::

RAW CODE ::::

___________________________________________ sha.html _____________________________________________

<!DOCTYPE html>
<html>
<head>
   <title>
       SHA-crack  
   </title>
   <style type="text/css">
       body {
           font-size: 20px;
       }
       fieldset {
           width: 600px;
       }
       input{
           width: 500px;
       }
   </style>
</head>
<body>
   <center>
       <form method="POST" action="sha.php">
           <fieldset>
               <legend>SHA Hashes</legend>
               <br>
               <input type="text" name="hash" placeholder="Enter your hash">
               <br><br>
               <button id="calc">crack</button>
           </fieldset>
       </form>
   </center>
</body>
</html>

####################################################################################################

___________________________________________________ sha.php ________________________________________

<?php
if ( isset($_POST["hash"]) ){
   $hash = $_POST["hash"];
   $type = "none";
   // This preg_match also maintains security for our site
   if (preg_match("/\b([a-f0-9]{40})\b/", $hash)){
       $type = "sha1";
   }elseif (preg_match("/\b([a-f0-9]{56})\b/", $hash)) {
       $type = "sha224";
   }elseif (preg_match("/\b([a-f0-9]{64})\b/", $hash)) {
       $type = "sha256";
   } // First we find out the hash type by the length of that hash
   if ($type !== "none"){ // So that we can get rid of searching all 3 files
       $fn = fopen($type."_list.txt","r"); // we can particularly search only 1 file
       $Arr = array(); // We have used the Array data structues to load the file data
       while(! feof($fn)) { // While loop for reading lines one by one
           $result = fgets($fn); // grabbing the line
           $line = substr($result, 0, strlen($result)-1); //removing '\n'
           if(strlen($line) === 0){ // End of file
               break; // terminating
           }
           $str_arr = explode (":", $line); // split by ':'
           $Arr[$str_arr[1]] = $str_arr[0]; // appending to array ; Arr[hash] = value
       }fclose($fn); // after completion of reading data ; closing the file
       if (array_key_exists($hash, $Arr)){ // If the key means hash exits
           $value = $Arr[$hash]; // Grabbing the value which results in hash
           $msg = $type."('".$value."') => ".$hash; // Making the msg var to output
           // both hash and value ; as sha...('value') => hash | in that way
       }
   }else{
       $msg = "Enter a valid hash"; // If pregmatch failed ; means wrong hash
   }
}else{
   $msg = "Enter a hash value"; // If hash value not sent by vai post
}
?>
<!DOCTYPE html>
<html>
<head>
   <title>Hash</title>
</head>
<body>
   <center>
       <!-- At last printing the msg which we want to output through html -->
       <p><b><?php echo $msg;?></b></p>
       <!-- To crack another hash -->
       <a href="sha.html">To Crack another hash</a>
   </center>
</body>
</html>

################################################################################################

________________________________________ sha1_list.txt _____________________________________________

hello:aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
world:7c211433f02071597741e6ff5a8ea34789abbf43
asdf:3da541559918a808c2402bba5012f6c60b27661c
asdf@123:1b28fb759ac3a1212038d60e8cffbada07093f5d
################################################################################################

_______________________________________ sha224_list.txt ___________________________________________

hello:d222253ccf19d787ecaa84c7dbfe5d3ee0311d19f085ce1d6a6d78fe
world:06d2dbdb71973e31e4f1df3d7001fa7de268aa72fcb1f6f9ea37e0e5
asdf:cda1d665441ef8120c3d3e82610e74ab0d3b043763784676654d8ef1
asdf@123:7c227e7f624e83b2c6463a8894f30229a1b3d411a5c171bc16c27f92
###############################################################################################

_______________________________________ sha256_list.txt __________________________________________

hello:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
world:486ea46224d1bb4fb680f34f7c9ad96a8f24ec88be73ea8e5a6c65260e9cb8a7
asdf:f0e4c2f76c58916ec258f246851bea091d14d4247a2fc3e18694461b1816e13b
asdf@123:2ff38c248d716dae4131fc40cb2097f9b3de7227792bdb33e78dedc1e11ffc1c
##############################################################################################

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