Here the code:
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| <html> | |
| <head> | |
| <h1>Web Service -RSA-</h1> | |
| </head> | |
| <body> | |
| <form action="/index.php" method="post"> | |
| <table> | |
| <tbody> | |
| <tr> | |
| <td>Challenge: | |
| <?php | |
| $x = rand(1,100); | |
| echo "<input type='text' placeholder='$x' size='11'/>"; | |
| echo "<input type='hidden' name='challenge' value='$x'>";?> | |
| <input type="submit" name="Generate" value="Generate" /></td> | |
| </tr> | |
| </form> | |
| <tr> | |
| <td><a href= script.py target=_balnk><button>Download script</button></a></td></tr> | |
| <tr> | |
| <td><form action="prove.php" method="post"> | |
| User:<input type="text" name="User" required size="20" value="" /><tr/> | |
| <input type='hidden' name='x' value= "<?php echo $x; ?>" > | |
| <tr><td>r: <input type="text" name="R" required placeholder="response" size="20" value=""/></td></tr> | |
| <tr><td><input type="submit" name="validate" value="Validate"></td> | |
| </form> | |
| </tr> | |
| </form> | |
| </table> | |
| </body> | |
| </html> |
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| <html> | |
| <body> | |
| <?php | |
| $user = $_REQUEST['User']; | |
| $lines=file('base.txt'); | |
| $i=0; | |
| $r = $_REQUEST['R']; | |
| $x = $_REQUEST['x']; | |
| echo "Valor de x $x"; | |
| echo "valor de r $r"; | |
| while($lines[$i]!=NULL){ | |
| $row = $lines[$i+1]; | |
| $sql = explode(",",$row); | |
| $i++; | |
| $aux = $sql[0]; | |
| if (strcmp($user,$aux) ==0 ){ | |
| $y = $x * 3 + 5; | |
| $n = $sql[1]; | |
| $e = $sql[2]; | |
| } | |
| else | |
| { | |
| //echo "si pasa aka"; | |
| // "<br/ >"; | |
| } | |
| } | |
| ?> | |
| <?php | |
| $k = 1; | |
| $u = $r % $n; | |
| while (e >0) | |
| { | |
| if(($e % 2) == 1) | |
| { | |
| $k = ($k*$u) % $n; | |
| } | |
| $e = $e/2; | |
| $u=($u*$u) % n; | |
| } | |
| $y = $x * 3+5; | |
| echo "imprimo $k"; | |
| echo "imprimo $y"; | |
| if ($k == $y){ | |
| echo "is him! :)"; | |
| }else | |
| { | |
| echo "not him :C"; | |
| } | |
| ?> | |
| </body> | |
| </html> |
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| #!/usr/bin/python | |
| def f(x): | |
| return x*3+5 | |
| def fastmodexp(x, y, mod): | |
| p = 1 | |
| aux = x | |
| while y > 0: | |
| if y % 2 == 1: | |
| p = (p * aux) % mod | |
| aux = (aux * aux) % mod | |
| y = y >> 1 | |
| return p | |
| def main(): | |
| x = int(raw_input("write your x: ")) | |
| d = int(raw_input("write your d: ")) | |
| n = int(raw_input("write your n: ")) | |
| y = f(x) | |
| r = fastmodexp(y, d, n) | |
| print "your r is = " + str(r) | |
| print "Give your r to your friend :)" |
here some images
http://alejandroave.260mb.org/Obed/
This fails when n is smaller than the challenge or when the key is large. We're also missing the second example (I was expecting to see a success and a failure). 7 pts.
ResponderEliminar