| | |
| | | // Add a single canary byte to the end of the clear text, which |
| | | // will help find out how much of padding will need to be removed |
| | | // upon decryption; see http://php.net/mcrypt_generic#68082. |
| | | $clear = pack("a*H2", $clear, "80"); |
| | | $ckey = $this->config->get_crypto_key($key); |
| | | |
| | | if (function_exists('openssl_encrypt')) { |
| | | $method = 'DES-EDE3-CBC'; |
| | | $opts = defined('OPENSSL_RAW_DATA') ? OPENSSL_RAW_DATA : true; |
| | | $iv = $this->create_iv(openssl_cipher_iv_length($method)); |
| | | $cipher = $iv . openssl_encrypt($clear, $method, $ckey, $opts, $iv); |
| | | } |
| | | else if (function_exists('mcrypt_module_open') && |
| | | ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")) |
| | | ) { |
| | | $iv = $this->create_iv(mcrypt_enc_get_iv_size($td)); |
| | | mcrypt_generic_init($td, $ckey, $iv); |
| | | $cipher = $iv . mcrypt_generic($td, $clear); |
| | | mcrypt_generic_deinit($td); |
| | | mcrypt_module_close($td); |
| | | } |
| | | else { |
| | | @include_once 'des.inc'; |
| | | |
| | | if (function_exists('des')) { |
| | | $des_iv_size = 8; |
| | | $iv = $this->create_iv($des_iv_size); |
| | | $cipher = $iv . des($ckey, $clear, 1, 1, $iv); |
| | | } |
| | | else { |
| | | self::raise_error(array( |
| | | 'code' => 500, 'type' => 'php', |
| | | 'file' => __FILE__, 'line' => __LINE__, |
| | | 'message' => "Could not perform encryption; make sure OpenSSL or Mcrypt or lib/des.inc is available" |
| | | ), true, true); |
| | | } |
| | | } |
| | | $clear = pack("a*H2", $clear, "80"); |
| | | $ckey = $this->config->get_crypto_key($key); |
| | | $method = 'DES-EDE3-CBC'; |
| | | $opts = defined('OPENSSL_RAW_DATA') ? OPENSSL_RAW_DATA : true; |
| | | $iv = rcube_utils::random_bytes(openssl_cipher_iv_length($method), true); |
| | | $cipher = $iv . openssl_encrypt($clear, $method, $ckey, $opts, $iv); |
| | | |
| | | return $base64 ? base64_encode($cipher) : $cipher; |
| | | } |
| | |
| | | $cipher = $base64 ? base64_decode($cipher) : $cipher; |
| | | $ckey = $this->config->get_crypto_key($key); |
| | | |
| | | if (function_exists('openssl_decrypt')) { |
| | | $method = 'DES-EDE3-CBC'; |
| | | $opts = defined('OPENSSL_RAW_DATA') ? OPENSSL_RAW_DATA : true; |
| | | $iv_size = openssl_cipher_iv_length($method); |
| | | $iv = substr($cipher, 0, $iv_size); |
| | | $method = 'DES-EDE3-CBC'; |
| | | $opts = defined('OPENSSL_RAW_DATA') ? OPENSSL_RAW_DATA : true; |
| | | $iv_size = openssl_cipher_iv_length($method); |
| | | $iv = substr($cipher, 0, $iv_size); |
| | | |
| | | // session corruption? (#1485970) |
| | | if (strlen($iv) < $iv_size) { |
| | | return ''; |
| | | } |
| | | |
| | | $cipher = substr($cipher, $iv_size); |
| | | $clear = openssl_decrypt($cipher, $method, $ckey, $opts, $iv); |
| | | // session corruption? (#1485970) |
| | | if (strlen($iv) < $iv_size) { |
| | | return ''; |
| | | } |
| | | else if (function_exists('mcrypt_module_open') && |
| | | ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")) |
| | | ) { |
| | | $iv_size = mcrypt_enc_get_iv_size($td); |
| | | $iv = substr($cipher, 0, $iv_size); |
| | | |
| | | // session corruption? (#1485970) |
| | | if (strlen($iv) < $iv_size) { |
| | | return ''; |
| | | } |
| | | |
| | | $cipher = substr($cipher, $iv_size); |
| | | mcrypt_generic_init($td, $ckey, $iv); |
| | | $clear = mdecrypt_generic($td, $cipher); |
| | | mcrypt_generic_deinit($td); |
| | | mcrypt_module_close($td); |
| | | } |
| | | else { |
| | | @include_once 'des.inc'; |
| | | |
| | | if (function_exists('des')) { |
| | | $des_iv_size = 8; |
| | | $iv = substr($cipher, 0, $des_iv_size); |
| | | $cipher = substr($cipher, $des_iv_size); |
| | | $clear = des($ckey, $cipher, 0, 1, $iv); |
| | | } |
| | | else { |
| | | self::raise_error(array( |
| | | 'code' => 500, 'type' => 'php', |
| | | 'file' => __FILE__, 'line' => __LINE__, |
| | | 'message' => "Could not perform decryption; make sure OpenSSL or Mcrypt or lib/des.inc is available" |
| | | ), true, true); |
| | | } |
| | | } |
| | | $cipher = substr($cipher, $iv_size); |
| | | $clear = openssl_decrypt($cipher, $method, $ckey, $opts, $iv); |
| | | |
| | | // Trim PHP's padding and the canary byte; see note in |
| | | // rcube::encrypt() and http://php.net/mcrypt_generic#68082 |
| | | $clear = substr(rtrim($clear, "\0"), 0, -1); |
| | | |
| | | return $clear; |
| | | } |
| | | |
| | | /** |
| | | * Generates encryption initialization vector (IV) |
| | | * |
| | | * @param int $size Vector size |
| | | * |
| | | * @return string Vector string |
| | | */ |
| | | private function create_iv($size) |
| | | { |
| | | // mcrypt_create_iv() can be slow when system lacks entrophy |
| | | // we'll generate IV vector manually |
| | | $iv = ''; |
| | | for ($i = 0; $i < $size; $i++) { |
| | | $iv .= chr(mt_rand(0, 255)); |
| | | } |
| | | |
| | | return $iv; |
| | | } |
| | | |
| | | /** |