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    mcrypt_cbc

    (PHP 4, PHP 5)

    mcrypt_cbc — Encripta/decripta datos en modo CBC

    Advertencia

    Esta función está OBSOLETA en PHP 5.5.0, por lo tanto, será ELIMINADA en PHP 7.0.0.

    Las alternativas a esta función son:

    Descripción

    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

    El primer prototipo es cuando se enlazó con libmcrypt 2.2.x, el segundo cuando se enlazó con libmcrypt 2.4.x o superiores. El parámetro mode debería ser o MCRYPT_ENCRYPT o MCRYPT_DECRYPT.

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    User Contributed Notes 3 notes

    up
    4
    Bubba at hines57 dot com
    12 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);
    }
    up
    0
    dafuk at dafuk dot co dot il
    12 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
    up
    -9
    Othman
    15 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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