How to encrypt with openSLL using the DES-CBC method - php

Question

Actually I'm using Mcrypt but I'm moving to OpenSSL and I need to be able to use it the exact same way as Mcrypt.
This is how I'm encrypting
mcrypt_encrypt(MCRYPT_DES, $key, $text, MCRYPT_MODE_cbc, "\0\0\0\0\0\0\0\0");
For the decryption, I already managed to do it in OpenSSL, both are working the same exact ways
//Using Mcrypt
mcrypt_decrypt(MCRYPT_DES, $key, $enc, MCRYPT_MODE_cbc, "\0\0\0\0\0\0\0\0");
//Using Openssl
openssl_decrypt($enc, 'des-cbc', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
For the encryption using OpenSSL, this is my test code
$key = "123456SO";
$text = "name=louis&cp=75013";
$encMcrypt = mcrypt_encrypt(MCRYPT_DES, $key, $text, MCRYPT_MODE_cbc, "\0\0\0\0\0\0\0\0");
$encOpenssl = openssl_encrypt($text, "des-cbc", $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, "\0\0\0\0\0\0\0\0");
echo "Mcrypt : " . urlencode(base64_encode($encMcrypt));
echo " OpenSsl : " . urlencode(base64_encode($encOpenssl));
And this is the output :
Mcrypt : f0tF0ERITdKiI2SxrttYAJBVNBtoGR%2BD OpenSsl :
This is the official list of method, but I can't find the DES methods.
I know that Openssl declared DES weak, but I still need to use it in my situation.
How can I encrypt in DES-CBC using OpenSSL and make it behave the same way as the Mcrypt fonction ?
Edit:
If I removed the OPENSSL_ZERO_PADDING option, the result is almost the one expected
Code:
openssl_encrypt($text, "des-cbc", $key, OPENSSL_RAW_DATA , "\0\0\0\0\0\0\0\0");
output:
Mcrypt : f0tF0ERITdKiI2SxrttYAJBVNBtoGR%2BD
OpenSsl : f0tF0ERITdKiI2SxrttYANpJ%2BZaEiIFr
The first part of the string is correct but at the end it differs from the output of the Mcrypt encryption string.

Answer 1

Thanks to #Topaco I managed to make it work
I added the OPENSSL_ZERO_PADDING option to disable the PKCS7 padding, then I created a function to manually pad my string with 0x00
function zero_padding($text)
{
if (strlen($text) % 8)
$text = str_pad($text,strlen($text) + 8 - strlen($text) % 8, "\0");
return $text;
}
$key = "123456SO";
$text = "name=louis&cp=75013";
$encMcrypt = mcrypt_encrypt(MCRYPT_DES, $key, $text, MCRYPT_MODE_cbc, "\0\0\0\0\0\0\0\0");
$encOpenssl = openssl_encrypt(zero_padding($text), "des-cbc", $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, "\0\0\0\0\0\0\0\0");
$encMcrypt = urlencode(base64_encode($encMcrypt));
$encOpenssl = urlencode(base64_encode($encOpenssl));
echo "Mcrypt :" . $encMcrypt;
echo "OpenSsl:" . $encOpenssl;
Output:
Mcrypt : f0tF0ERITdKiI2SxrttYAJBVNBtoGR%2BD
OpenSsl: f0tF0ERITdKiI2SxrttYAJBVNBtoGR%2BD