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mcrypt_get_iv_size(PHP 4 >= 4.0.2, PHP 5) mcrypt_get_iv_size -- Returns the size of the IV belonging to a specific cipher/mode combinationDescriptionint mcrypt_get_iv_size ( string cipher, string mode )mcrypt_get_iv_size() returns the size of the Initialisation Vector (IV) in bytes. On error the function returns FALSE. If the IV is ignored in the specified cipher/mode combination zero is returned. cipher is one of the MCRYPT_ciphername constants of the name of the algorithm as string. mode is one of the MCRYPT_MODE_modename constants or one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". The IV is ignored in ECB mode as this mode does not require it. You will need to have the same IV (think: starting point) both at encryption and decryption stages, otherwise your encryption will fail. It is more useful to use the mcrypt_enc_get_iv_size() function as this uses the resource returned by mcrypt_module_open().
See also mcrypt_get_block_size(), mcrypt_enc_get_iv_size() and mcrypt_create_iv(). Copyright © 1997 - 2007 by the PHP Documentation Group. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later. A copy of the Open Publication License is distributed with this manual, the latest version is presently available at http://www.opencontent.org/openpub/. Please see full copyright text at http://www.php.net/manual/en/copyright.php Original version of the above documentation is available at http://www.php.net/manual/en/ |
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