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mcrypt_cbc

(PHP 4, PHP 5)

mcrypt_cbc — 以 CBC 模式加解密数据

Warning

This function was DEPRECATED in PHP 5.5.0, and REMOVED in PHP 7.0.0.

Alternatives to this function include:

说明

mcrypt_cbc ( int $cipher , string $key , string $data , int $mode [, string $iv ] ) : string

mcrypt_cbc ( string $cipher , string $key , string $data , int $mode [, string $iv ] ) : string

第一个原型是针对 libmcrypt 2.2.x 的，第二个原型是针对 libmcrypt 2.4.x 及更高版本的。 mode 可选值为： MCRYPT_ENCRYPT 或 MCRYPT_DECRYPT。

User Contributed Notes

Bubba at hines57 dot com 22-Jul-2012 04:59


The PERL libraries have changed a little bit and getting PHP and PERL to mcrypt together can be confusing, so here is a current example;





PHP


===


<?php


$string = 'Some Secret thing I want to encrypt';


$iv = '12345678';


$passphrase = '8chrsLng';





$encryptedString = encryptString($string, $passphrase, $iv);


// Expect: 7DjnpOXG+FrUaOuc8x6vyrkk3atSiAf425ly5KpG7lOYgwouw2UATw== 





function encryptString($unencryptedText, $passphrase, $iv) {


  $enc = mcrypt_encrypt(MCRYPT_BLOWFISH, $passphrase, $unencryptedText, MCRYPT_MODE_CBC, $iv);


  return base64_encode($enc);


}


?>





PERL


====


$encryptedString = '7DjnpOXG+FrUaOuc8x6vyrkk3atSiAf425ly5KpG7lOYgwouw2UATw==';


$iv = '12345678';


$passphrase = '8chrsLng';





$string = &decryptPhpEncrypted $encryptedString, $passphrase, $iv;


# Expect: Some Secret thing I want to encrypt





sub decryptPhpEncrypted() {


  my ($encryptedString, $passphrase, $iv) = @_;


  my $keysize = length($passphrase);


  use Crypt::CBC;


  $cipher = Crypt::CBC->new( {'key' => $encryptedString,


                              'cipher'=> 'Blowfish',


                              'iv' => $iv,


                              'keysize' => $keysize,


                              'regenerate_key' => 0,


                              'padding' => 'null',


                              'prepend_iv' => 0});





  return $cipher->decrypt($encryptedString);


}

dafuk at dafuk dot co dot il 25-Apr-2012 11:20


if you use blowfish and somehow when you compare strings before and after it was  (usually when it's shorter than 8 or 16 bytes) you might notice the difference, it comes out that this function does not remove padding, as a result you get a bunch of nulls at the end.



use

$decrypted = rtrim($decrypted,"\0"); 

to fix it

Othman 16-May-2009 09:56


The following code is to 

encrypt-->encode 

decode-->decrypt



<?php

$stuff="String to enc/enc/dec/dec =,=,";

$key="XiTo74dOO09N48YeUmuvbL0E";



function nl() {

    echo "<br/> \n";

}

$iv = mcrypt_create_iv (mcrypt_get_block_size (MCRYPT_TripleDES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM);



// Encrypting

function encrypt($string, $key) {

    $enc = "";

    global $iv;

    $enc=mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_ENCRYPT, $iv);



  return base64_encode($enc);

}



// Decrypting 

function decrypt($string, $key) {

    $dec = "";

    $string = trim(base64_decode($string));

    global $iv;

    $dec = mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_DECRYPT, $iv);

  return $dec;

}



$encrypted = encrypt($stuff, $key);

$decrypted = decrypt($encrypted, $key);



echo "Encrypted is ".$encrypted . nl(); 

echo "Decrypted is ".$decrypted . nl(); 

?>



Notes on the result 

-o running the script from the command line 1 time 

    php script.php works correct

-o if i ran the script in a loop i.e.



#!/bin/bash

for x in `seq 100` 

do

        echo $x

        php script.php >> LOG.text 

        sleep 1



done

it gets slower after the 10th time

+ inconsistent output 

sometimes correct some with encrypted characters at the end of the decrypted string 



-o Firefox on Linux it decrypts to the original string but appends 

    some encryption at the end of the decrypted sting

-o running the script on the browser from windows on Firefox, 

    Google Chrome, IE7 works fine for just few times 

    "refresh every few seconds" 

    if refresh fast it doesn't work correctly, 

    some times returns the decrypted as encrypted!

    some times returns mix of encrypted & decrypted



I thought if sharing that test for those functions might be 

useful for some body

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mcrypt_cbc

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