PHP 5.6.22 is available

mcrypt_decrypt

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

mcrypt_decryptDesencripta texto cifrado con los parámetros dados

Descripción

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

Desencripta data y devuelve los datos sin cifrar.

Parámetros

cipher

Una de las constantes MCRYPT_nombredelcifrado, o el nombre del algoritmo como string.

key

La clave con la cual los datos fueron cifrados. Si la clave proporcionada no está soportada por el cifrador, la función emitirá una advertencia y devolverá FALSE

data

La información que será descifrada con el cifrador y modo dados por los parámetros cipher y mode. Si el tamaño de la información no es n * blocksize, la información será rellenada con '\0'.

mode

Una de las constantes MCRYPT_MODE_nombredelmodo, o una de las siguientes strings: "ecb", "cbc", "cfb", "ofb", "nofb" o "stream".

iv

Utilizado para la inicialización en los modos CBC, CFB, OFB, y en algunos algoritmos en el modo STREAM. Si el tamañlo del IV proporcionado no está soportado por el modo de encadenamiento o no se proporcionó ninún IV, y el modo de encadenamiento requiere uno, la función emitirá una advertencia y devolverá FALSE.

Valores devueltos

Devuelve los datos descifrados en formato cadena o FALSE en caso de error.

Historial de cambios

Versión Descripción
5.6.0 Tamaños incorrectos en key y iv ya no son admitidos. mcrypt_decrypt() emitirá una advertencia y devolverá FALSE si los datos de entrada son incorrectos. Anteriormente la clave y el IV eran rellenados con bytes '\0' hasta el siguiente tamaño válido.

Ver también

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User Contributed Notes 7 notes

up
23
eddiec at stararcher dot com
10 years ago
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:
<?php
    $retval
= mcrypt_decrypt( ...etc ...);
   
$retval = rtrim($retval, "\0");     // trim ONLY the nulls at the END
?>
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8
david at sickmiller dot com
7 years ago
If you happen to be decrypting something encrypted in ColdFusion, you'll discover that its encrypt function apparently pads the plaintext with ASCII 4, the "end of transmission" character.

Building on eddiec's code, you can remove both nulls and EOTs with this:

<?php
    $retval
= mcrypt_decrypt( ...etc ...);
   
$retval = rtrim($retval, "\0\4");     // trim ONLY the nulls and EOTs at the END
?>
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9
evangelion207 at hotmail dot com
5 years ago
Be careful, sometimes mcrypt_decrypt return additional white spaces to the uncrypted string; use trim() for deleting them. I was like 2 hours searching the error and it was that..
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6
beltrachi
4 years ago
Caution, MCRYPT_RIJNDAEL_256 is not equivalent to AES_256.

The way to make RIJNDAEL be decrypted from AES with openssl is to use MCRYPT_RIJNDAEL_128 and padd the string to encrypt before encrypting with the follwing function:

<?php
function pkcs5_pad ($text, $blocksize) {
   
$pad = $blocksize - (strlen($text) % $blocksize);
    return
$text . str_repeat(chr($pad), $pad);
}
?>

On the decryption, the choosing of AES_256 or AES_128, etc. is based on the keysize used in the crypting. In my case it was a 128bit key so I used AES_128.
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1
Anonymous
5 years ago
To remove PKCS7 padding:

<?php
    $decrypted
= mdecrypt_generic($td, base64_decode($enc_auth_token));
   
$dec_s = strlen($decrypted);
   
$padding = ord($decrypted[$dec_s-1]);
   
$decrypted = substr($decrypted, 0, -$padding);
?>
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0
pnz dot r00t at yandex dot ru
2 months ago
When i using this function i find some problem, with adding additional binary symbols in decode message.
$sDecrypt – «2433091»
$sDecrypt strlen – 16 (before trim)
$sDecrypt – «2433091»
$sDecrypt strlen – 7 (after trim)
At local PC this problem solved by using trim/trim, but if I send my encrypt message to sever, and try encrypt them, I see that my message is not 16 symbols, as it was in my local pc, it is 32 sybmols, after encode. And trim function not working. I look at symbols code and what I see
    50
    52
    51
    51
    48
    57
    49
    0
    0
    0
    0
    0
    0
    0
    0
    0
    10
    158
    112
    183
    154
    27
    95
    85
    42
    35
    95
    54
    227
    41
    179
    77
After “tabulation symbols” I get some junk symbols, and  I solve this problems like this.
After mcrypt_decrypt I use this code
$plaintext_dec = substr($plaintext_dec, 0, strpos($plaintext_dec, "\0"));
I think it is not best resolution for this problem, but I solve my problem :)
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-8
artaxerxes2 at iname dot com
3 years ago
To decrypt data coming from MySQL's AES_ENCRYPT function:

<?php

function mysql_aes_key($key)
{
   
$new_key = str_repeat(chr(0), 16);
    for(
$i=0,$len=strlen($key);$i<$len;$i++)
    {
       
$new_key[$i%16] = $new_key[$i%16] ^ $key[$i];
    }
    return
$new_key;
}

function
aes_decrypt($encrypted,$key)
{
   
// if $encrypted is HEXed, then return it to binary
   
$encrypted = pack('H*',$encrypted);

   
$key = mysql_aes_key($key);
    return
rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128,$key,$encrypted,MCRYPT_MODE_ECB,''),"\x00..\x1F");
}

?>

adapted from the article "Replicating MySQL AES Encryption Methods With PHP" (dated 2012-05-20) found somewhere online.
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