removed mods directory from the ATutor codebase

[atutor.git] / mods / social / lib / Crypto.php

diff --git a/mods/social/lib/Crypto.php b/mods/social/lib/Crypto.php
deleted file mode 100644 (file)
index c0d31c9..0000000
--- a/mods/social/lib/Crypto.php
+++ /dev/null
@@ -1,123 +0,0 @@
-<?php
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-class GeneralSecurityException extends Exception {
-}
-
-final class Crypto {
-  
-  /**
-   * HMAC algorithm to use
-   */
-  private static $HMAC_TYPE = "HMACSHA1";
-  
-  /** 
-   * minimum safe length for hmac keys (this is good practice, but not 
-   * actually a requirement of the algorithm
-   */
-  private static $MIN_HMAC_KEY_LEN = 8;
-  
-  /**
-   * Encryption algorithm to use
-   */
-  private static $CIPHER_TYPE = "AES/CBC/PKCS5Padding";
-  
-  private static $CIPHER_KEY_TYPE = "AES";
-  
-  /**
-   * Use keys of this length for encryption operations
-   */
-  public static $CIPHER_KEY_LEN = 16;
-  
-  private static $CIPHER_BLOCK_SIZE = 16;
-  
-  /**
-   * Length of HMAC SHA1 output
-   */
-  public static $HMAC_SHA1_LEN = 20;
-
-  private function __construct() {}
-
-  public static function hmacSha1Verify($key, $in, $expected) {
-    $hmac = Crypto::hmacSha1($key, $in);
-    if ($hmac != $expected) {
-      throw new GeneralSecurityException("HMAC verification failure");
-    }
-  }
-
-  public static function aes128cbcEncrypt($key, $text) {
-    /* Open the cipher */
-    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
-    if (! $td) {
-      throw new GeneralSecurityException('Invalid mcrypt cipher, check your libmcrypt library and php-mcrypt extention');
-    }
-    // replaced MCRYPT_DEV_RANDOM with MCRYPT_RAND since windows doesn't have /dev/rand :)
-    srand((double)microtime() * 1000000);
-    $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
-    /* Intialize encryption */
-    mcrypt_generic_init($td, $key, $iv);
-    /* Encrypt data */
-    $encrypted = mcrypt_generic($td, $text);
-    /* Terminate encryption handler */
-    mcrypt_generic_deinit($td);
-    /*
-                *  AES-128-CBC encryption.  The IV is returned as the first 16 bytes
-                * of the cipher text.
-                */
-    return $iv . $encrypted;
-  }
-
-  public static function aes128cbcDecrypt($key, $encrypted_text) {
-    /* Open the cipher */
-    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
-    if (is_callable('mb_substr')) {
-      $iv = mb_substr($encrypted_text, 0, Crypto::$CIPHER_BLOCK_SIZE, 'latin1');
-    } else {
-      $iv = substr($encrypted_text, 0, Crypto::$CIPHER_BLOCK_SIZE);
-    }
-    /* Initialize encryption module for decryption */
-    mcrypt_generic_init($td, $key, $iv);
-    /* Decrypt encrypted string */
-    if (is_callable('mb_substr')) {
-      $encrypted = mb_substr($encrypted_text, Crypto::$CIPHER_BLOCK_SIZE, mb_strlen($encrypted_text, 'latin1'), 'latin1');
-    } else {
-      $encrypted = substr($encrypted_text, Crypto::$CIPHER_BLOCK_SIZE);
-    }
-    $decrypted = mdecrypt_generic($td, $encrypted);
-    /* Terminate decryption handle and close module */
-    mcrypt_generic_deinit($td);
-    mcrypt_module_close($td);
-    /* Show string */
-    return trim($decrypted);
-  }
-
-  public static function hmacSha1($key, $data) {
-    $blocksize = 64;
-    $hashfunc = 'sha1';
-    if (strlen($key) > $blocksize) {
-      $key = pack('H*', $hashfunc($key));
-    }
-    $key = str_pad($key, $blocksize, chr(0x00));
-    $ipad = str_repeat(chr(0x36), $blocksize);
-    $opad = str_repeat(chr(0x5c), $blocksize);
-    $hmac = pack('H*', $hashfunc(($key ^ $opad) . pack('H*', $hashfunc(($key ^ $ipad) . $data))));
-    return $hmac;
-  }
-}