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。

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User Contributed Notes 3 notes

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Bubba at hines57 dot com ¶

6 years ago


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);

}

down

dafuk at dafuk dot co dot il ¶

7 years ago


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

down

-7

Othman ¶

10 years ago


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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官方地址：https://www.php.net/manual/en/function.mcrypt-cbc.php

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mcrypt_cbc

说明

User Contributed Notes 3 notes