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Add PHP implementation for Jummania URL encryption/decryption
This commit introduces a PHP script that replicates the functionality of the Java Jummania class. It handles AES-128 encryption/decryption with obfuscated keys and provides a corresponding Java code snippet for interoperability. Additionally, the `.idea/php.xml` file was updated to specify the PHP language level.
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‎.idea/php.xml‎

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‎index.php‎

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<?php
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/**
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* Jummania.php
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*
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* Replicates the Java Jummania class in PHP:
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* 1. Generates an AES-128 key, encodes it without padding, shifts each char +1
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* 2. Reverses that to recover the raw key
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* 3. Encrypts a URL with AES/ECB/PKCS5Padding, Base64-encodes it, then shifts each char −1
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* 4. Shifts back +1, Base64-decodes, and decrypts to recover the original URL
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*/
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$string = $_GET['string'] ?? null;
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if (!$string) {
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// Build current URL without query string
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$scheme = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? "https" : "http";
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$host = $_SERVER['HTTP_HOST'];
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$path = $_SERVER['PHP_SELF']; // script path
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$currentUrl = $scheme . "://" . $host . $path;
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$javaCode = <<<JAVA
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Exception in thread "main" java.lang.IllegalStateException: string must not be null
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at com.jummania.link.Main.main(Main.java:10)
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Usage: {$currentUrl}?string=your_encrypted_text_here
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JAVA;
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showJavaCode($javaCode);
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exit();
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}
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// 1. Generate a lightweight AES-128 key (16 raw bytes)
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$base64Key = rtrim(base64_encode(random_bytes(16)), '=');
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// 2. Obfuscate the key: shift each character by +1
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$encKeyChars = '';
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for ($i = 0, $l = strlen($base64Key); $i < $l; $i++) {
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$encKeyChars .= chr(ord($base64Key[$i]) + 1);
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}
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// 3. Function to reverse key obfuscation
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function getSecretKey(string $keyStr): string
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{
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$decoded = '';
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for ($i = 0, $l = strlen($keyStr); $i < $l; $i++) {
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$decoded .= chr(ord($keyStr[$i]) - 1);
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}
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return base64_decode($decoded);
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}
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$secretKey = getSecretKey($encKeyChars);
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// 4. Encrypt the text and shift each char by -1
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function encryptShift(string $plainText, string $key): string
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{
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$encrypted = openssl_encrypt($plainText, 'AES-128-ECB', $key, OPENSSL_RAW_DATA);
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$b64 = base64_encode($encrypted);
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$shifted = '';
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for ($i = 0, $l = strlen($b64); $i < $l; $i++) {
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$shifted .= chr(ord($b64[$i]) - 1);
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}
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return $shifted;
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}
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$shiftedEnc = encryptShift($string, $secretKey);
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$javaCode = <<<JAVA
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public class Jummania {
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public static String getString() {
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javax.crypto.SecretKey secretKey = getSecretKey("$encKeyChars");
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return getString(secretKey, "$shiftedEnc");
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}
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public static javax.crypto.SecretKey getSecretKey(String key) {
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String string = shiftChars(key, -1);
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byte[] decodedKey = java.util.Base64.getDecoder().decode(string);
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return new javax.crypto.spec.SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
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}
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public static String getString(javax.crypto.SecretKey secretKey, String encryptedText) {
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try {
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String string = shiftChars(encryptedText, 1);
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java.util.Base64.Decoder decoder = java.util.Base64.getDecoder();
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byte[] encryptedTextByte = decoder.decode(string);
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javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("AES");
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cipher.init(javax.crypto.Cipher.DECRYPT_MODE, secretKey);
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return new String(cipher.doFinal(encryptedTextByte));
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} catch (Exception e) {
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return null;
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}
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}
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public static String shiftChars(String input, int shift) {
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StringBuilder result = new StringBuilder();
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for (char c : input.toCharArray()) {
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result.append((char) (c + shift));
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}
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return result.toString();
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}
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}
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JAVA;
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showJavaCode($javaCode);
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function showJavaCode(string $javaCode)
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{
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?>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Java Code</title>
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/java.min.js"></script>
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<script>hljs.highlightAll();</script>
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</head>
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<body>
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<pre><code class="language-java"><?php echo htmlspecialchars($javaCode); ?></code></pre>
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</body>
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</html>
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<?php
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exit();
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}

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