PHP. Руководство по PHP. 2005

mcrypt_encrypt

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mcrypt_encrypt

(PHP 4 >= 4.0.2, PHP 5)mcrypt_encrypt -- Encrypts plaintext with given parameters

Description

string mcrypt_encrypt (string cipher, string key, string data, string mode [, string iv])

mcrypt_encrypt() encrypts the data

and returns the encrypted data.

Cipher is one of the MCRYPT_ciphername

constants of the name of the algorithm as string.

Key is the key with which the data

will be encrypted. If it's smaller that the required keysize, it

is padded with '\0'. It is better not to use ASCII strings for

keys. It is recommended to use the mhash functions to create a key

from a string.

Data is the data that will be encrypted

with the given cipher and mode. If the size of the data is not

n * blocksize, the data will be padded with '\0'. The returned

crypttext can be larger that the size of the data that is given

by data.

Mode is one of the MCRYPT_MODE_modename

constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or

"stream".

The IV parameter is used for the

initialisation in CBC, CFB, OFB modes, and in some algorithms

in STREAM mode. If you do not supply an IV, while it is needed

for an algorithm, the function issues a warning and uses an

IV with all bytes set to '\0'.

Пример 1. mcrypt_encrypt() Example


<?php
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$key = "This is a very secret key";
$text = "Meet me at 11 o'clock behind the monument.";
echo strlen($text). "\n";

$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
echo strlen($crypttext). "\n";
?>

Результат выполнения данного примера:

See also mcrypt_module_open() for a more advanced API

and an example.

mcrypt_enc_self_test

mcrypt_generic_deinit

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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