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(PHP 4 >= 4.0.2, PHP 5)

mdecrypt_generic — Decrypt data


string mdecrypt_generic ( resource $td , string $data )

This function decrypts data. Note that the length of the returned string can in fact be longer then the unencrypted string, due to the padding of the data.

Example#1 mdecrypt_generic() example

/* Data */
$key 'this is a very long key, even too long for the cipher';
$plain_text 'very important data';
/* Open module, and create IV */ 
$td mcrypt_module_open('des''''ecb''');
$key substr($key0mcrypt_enc_get_key_size($td));
$iv_size mcrypt_enc_get_iv_size($td);
$iv mcrypt_create_iv($iv_sizeMCRYPT_RAND);

/* Initialize encryption handle */
if (mcrypt_generic_init($td$key$iv) != -1) {

/* Encrypt data */
$c_t mcrypt_generic($td$plain_text);

/* Reinitialize buffers for decryption */
$p_t mdecrypt_generic($td$c_t);

/* Clean up */

    if (
strncmp($p_t$plain_textstrlen($plain_text)) == 0) {
    } else {

The above example shows how to check if the data before the encryption is the same as the data after the decryption. It is very important to reinitialize the encryption buffer with mcrypt_generic_init() before you try to decrypt the data.

The decryption handle should always be initialized with mcrypt_generic_init() with a key and an IV before calling this function. Where the encryption is done, you should free the encryption buffers by calling mcrypt_generic_deinit(). See mcrypt_module_open() for an example.

See also mcrypt_generic(), mcrypt_generic_init(), and mcrypt_generic_deinit().