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