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[freeside.git] / fs_selfservice / fri / includes / crypt.php

diff --git a/fs_selfservice/fri/includes/crypt.php b/fs_selfservice/fri/includes/crypt.php
new file mode 100644 (file)
index 0000000..301d8a8
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+++ b/fs_selfservice/fri/includes/crypt.php
@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * Allows encrypt and decrypt
+ */
+class Crypt {
+
+  /**
+   * Gets a random value for encryption
+   * - From php.net docs
+   *
+   * @param $iv_len
+   *   length of random variable
+   */
+  function getRndIV($iv_len) {
+
+    $iv = '';
+    while ($iv_len-- > 0) {
+      $iv .= chr(mt_rand() & 0xff);
+    }
+    return $iv;
+  }
+
+  /**
+   * Encrypts string
+   * - From php.net docs
+   *
+   * @param $str
+   *   string to encrypt
+   * @param $salt
+   *   password to use for encryption
+   * @param $iv_len
+   *   length of random number
+   */
+  function encrypt($str, $salt, $iv_len = 16) {
+
+    $str .= "\x13";
+    $n = strlen($str);
+    if ($n % 16) $str .= str_repeat("\0", 16 - ($n % 16));
+    $i = 0;
+    $enc_text = $this->getRndIV($iv_len);
+    $iv = substr($salt ^ $enc_text, 0, 512);
+    while ($i < $n) {
+      $block = substr($str, $i, 16) ^ pack('H*', md5($iv));
+      $enc_text .= $block;
+      $iv = substr($block . $iv, 0, 512) ^ $salt;
+      $i += 16;
+    }
+    return urlencode(base64_encode($enc_text));
+  }
+
+  /**
+   * Decrypts string
+   * - From php.net docs
+   *
+   * @param $enc
+   *   encrypted string to decrypt
+   * @param $salt
+   *   password to use for encryption
+   * @param $iv_len
+   *   length of random number
+   */
+  function decrypt($enc, $salt, $iv_len = 16) {
+
+     $enc = urldecode(base64_decode($enc));
+     $n = strlen($enc);
+     $i = $iv_len;
+     $str = '';
+     $iv = substr($salt ^ substr($enc, 0, $iv_len), 0, 512);
+     while ($i < $n) {
+         $block = substr($enc, $i, 16);
+         $str .= $block ^ pack('H*', md5($iv));
+         $iv = substr($block . $iv, 0, 512) ^ $salt;
+         $i += 16;
+     }
+     return preg_replace('/\\x13\\x00*$/', '', $str);
+  }
+}
+
+
+?>