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PHP Vigenere Cipher
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| <?php | |
| // initialize variables | |
| $pswd = ""; | |
| $code = ""; | |
| $error = ""; | |
| $valid = true; | |
| $color = "#FF0000"; | |
| // if form was submit | |
| if ($_SERVER['REQUEST_METHOD'] == "POST") | |
| { | |
| // declare encrypt and decrypt funtions | |
| require_once('vigenere.php'); | |
| // set the variables | |
| $pswd = $_POST['pswd']; | |
| $code = $_POST['code']; | |
| // check if password is provided | |
| if (empty($_POST['pswd'])) | |
| { | |
| $error = "Please enter a password!"; | |
| $valid = false; | |
| } | |
| // check if text is provided | |
| else if (empty($_POST['code'])) | |
| { | |
| $error = "Please enter some text or code to encrypt or decrypt!"; | |
| $valid = false; | |
| } | |
| // check if password is alphanumeric | |
| else if (isset($_POST['pswd'])) | |
| { | |
| if (!ctype_alpha($_POST['pswd'])) | |
| { | |
| $error = "Password should contain only alphabetical characters!"; | |
| $valid = false; | |
| } | |
| } | |
| // inputs valid | |
| if ($valid) | |
| { | |
| // if encrypt button was clicked | |
| if (isset($_POST['encrypt'])) | |
| { | |
| $code = encrypt($pswd, $code); | |
| $error = "Text encrypted successfully!"; | |
| $color = "#526F35"; | |
| } | |
| // if decrypt button was clicked | |
| if (isset($_POST['decrypt'])) | |
| { | |
| $code = decrypt($pswd, $code); | |
| $error = "Code decrypted successfully!"; | |
| $color = "#526F35"; | |
| } | |
| } | |
| } | |
| ?> | |
| <html> | |
| <head> | |
| <title>XBCrypt - Vigenere Cipher</title> | |
| <link href="favicon.ico" rel="shortcut icon" type="image/x-icon" /> | |
| <link rel="stylesheet" type="text/css" href="style.css"> | |
| <script type="text/javascript" src="Script.js"></script> | |
| </head> | |
| <body> | |
| <br><br><br> | |
| <form action="index.php" method="post"> | |
| <table cellpadding="5" align="center" cellpadding="2" border="7"> | |
| <caption><hr><b>XBCrypt - Text Cryption</b><hr></caption> | |
| <tr> | |
| <td align="center">Password: <input type="text" name="pswd" id="pass" value="<?php echo htmlspecialchars($pswd); ?>" /></td> | |
| </tr> | |
| <tr> | |
| <td align="center"><textarea id="box" name="code"><?php echo htmlspecialchars($code); ?></textarea></td> | |
| </tr> | |
| <tr> | |
| <td><input type="submit" name="encrypt" class="button" value="Encode" onclick="validate(1)" /></td> | |
| </tr> | |
| <tr> | |
| <td><input type="submit" name="decrypt" class="button" value="Decode" onclick="validate(2)" /></td> | |
| </tr> | |
| <tr> | |
| <td align="center">XBCrypt | By #XByte | Copyright © 2015 | <span style="cursor:pointer;color:#0000FF" onclick="help()">help</span></td> | |
| </tr> | |
| <tr> | |
| <td><center><div style="color: <?php echo htmlspecialchars($color) ?>"><?php echo htmlspecialchars($error) ?></div></center></td> | |
| </tr> | |
| </table> | |
| </form> | |
| </body> | |
| </html> |
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| textarea { | |
| width: 500; | |
| height: 200; | |
| background-color: E0E0E0; | |
| color: #0000FF; | |
| } | |
| input { | |
| font-family: Courier New; | |
| } | |
| .button { | |
| width: 500; | |
| height: 40; | |
| } | |
| b { | |
| font-size: 20pt; | |
| color: #303030; | |
| } | |
| body { | |
| background-color: #808080; | |
| font-family: Courier New; | |
| } | |
| table { | |
| border-color: #A0A0A0; | |
| background-color: #C0C0C0; | |
| } |
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| <?php | |
| // function to encrypt the text given | |
| function encrypt($pswd, $text) | |
| { | |
| // change key to lowercase for simplicity | |
| $pswd = strtolower($pswd); | |
| // intialize variables | |
| $code = ""; | |
| $ki = 0; | |
| $kl = strlen($pswd); | |
| $length = strlen($text); | |
| // iterate over each line in text | |
| for ($i = 0; $i < $length; $i++) | |
| { | |
| // if the letter is alpha, encrypt it | |
| if (ctype_alpha($text[$i])) | |
| { | |
| // uppercase | |
| if (ctype_upper($text[$i])) | |
| { | |
| $text[$i] = chr(((ord($pswd[$ki]) - ord("a") + ord($text[$i]) - ord("A")) % 26) + ord("A")); | |
| } | |
| // lowercase | |
| else | |
| { | |
| $text[$i] = chr(((ord($pswd[$ki]) - ord("a") + ord($text[$i]) - ord("a")) % 26) + ord("a")); | |
| } | |
| // update the index of key | |
| $ki++; | |
| if ($ki >= $kl) | |
| { | |
| $ki = 0; | |
| } | |
| } | |
| } | |
| // return the encrypted code | |
| return $text; | |
| } | |
| // function to decrypt the text given | |
| function decrypt($pswd, $text) | |
| { | |
| // change key to lowercase for simplicity | |
| $pswd = strtolower($pswd); | |
| // intialize variables | |
| $code = ""; | |
| $ki = 0; | |
| $kl = strlen($pswd); | |
| $length = strlen($text); | |
| // iterate over each line in text | |
| for ($i = 0; $i < $length; $i++) | |
| { | |
| // if the letter is alpha, decrypt it | |
| if (ctype_alpha($text[$i])) | |
| { | |
| // uppercase | |
| if (ctype_upper($text[$i])) | |
| { | |
| $x = (ord($text[$i]) - ord("A")) - (ord($pswd[$ki]) - ord("a")); | |
| if ($x < 0) | |
| { | |
| $x += 26; | |
| } | |
| $x = $x + ord("A"); | |
| $text[$i] = chr($x); | |
| } | |
| // lowercase | |
| else | |
| { | |
| $x = (ord($text[$i]) - ord("a")) - (ord($pswd[$ki]) - ord("a")); | |
| if ($x < 0) | |
| { | |
| $x += 26; | |
| } | |
| $x = $x + ord("a"); | |
| $text[$i] = chr($x); | |
| } | |
| // update the index of key | |
| $ki++; | |
| if ($ki >= $kl) | |
| { | |
| $ki = 0; | |
| } | |
| } | |
| } | |
| // return the decrypted text | |
| return $text; | |
| } | |
| ?> |
Do you have Playfair cipher.
Thanks, dude 🙏
Nice
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Thanks man, was very helpfull