Web студия "GrandView"

Description

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

mcrypt_decrypt() decrypts the data and returns the unencrypted 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 is encrypted. If it's smaller that the required keysize, it is padded with '\0'.

Data is the data that will be decrypted with the given cipher and mode. If the size of the data is not n * blocksize, the data will be padded with '\0'.

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'.

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mcrypt_decrypt

smp_info at yahoo dot com
10-Oct-2007 11:27


Since the returned data seems to be still padded with extra characters, you can get *only* the original data that was encrypted by str_replace()'ing the \x0 characters.



<?php

$decryptedData = str_replace("\x0", '', $encryptedData);

?>

eddiec at stararcher dot com
13-Jul-2005 06:26


It appears that mcrypt_decrypt pads the *RETURN STRING* with nulls ('\0') to fill out to n * blocksize.  For old C-programmers, like myself, it is easy to believe the string ends at the first null.  In PHP it does not:



    strlen("abc\0\0") returns 5 and *NOT* 3

    strcmp("abc", "abc\0\0") returns -2 and *NOT* 0



I learned this lesson painfully when I passed a string returned from mycrypt_decrypt into a NuSoap message, which happily passed the nulls along to the receiver, who couldn't figure out what I was talking about.



My solution was:

<?

    $retval = mcrypt_decrypt( ...etc ...);

    $retval = rtrim($retval, "\0");     // trim ONLY the nulls at the END

?>

kooktroop at gmail dot com
09-Jul-2004 03:13


Following on from the mcrypt_encrypt() example:



<?php

$text = "boggles the inivisble monkey will rule the world";

$key = "This is a very secret key";



$iv_size = mcrypt_get_iv_size(MCRYPT_XTEA, MCRYPT_MODE_ECB);

$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

echo strlen($text) . "<br>";



$enc = mcrypt_encrypt(MCRYPT_XTEA, $key, $text, MCRYPT_MODE_ECB, $iv);

echo strlen($enc) . "<br>";

   

$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

$key = "This is a very secret key";

$text = "Meet me at 11 o'clock behind the monument.";

echo strlen($text) . "<br>";



$crypttext = mcrypt_decrypt(MCRYPT_XTEA, $key, $enc, MCRYPT_MODE_ECB, $iv);

echo "$crypttext<br>";

?>

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