Bug #62102 [NEW]: mcrypt CAST128 80/40-bit does not agree with RFC2144 test vectors
From:
Operating system: Windows XP
PHP version: 5.3.13
Package: mcrypt related
Bug Type: Bug
Bug description:mcrypt CAST128 80/40-bit does not agree with RFC2144 test vectors
Description:
------------
Please verify that the 80-bit and 40-bit test vectors in RFC2144 Section
B.1 do
not agree with the output from mcrypt when using CAST 128 encryption. I
provided
a test program with functions that print and parse the hexadecimal.
I am using mcrypt 2.5.8 on php 5.3.13.
The 128-bit test vector does work though. The problem is probably related
to the
fact that CAST-128 changes the number of rounds from 16 to 12 when a key is
80
bits or smaller.
I have verified that the test vectors in RFC2144 work with a different
piece of
code written in C.
Please let me know if there is a work around.
Test script:
---------------
function str2hex($string)
{
$hex='';
for ($i=0; $i < strlen($string); $i++)
{
$hex .= sprintf("%02x",ord($string[$i])) . ' ';
}
return $hex;
}
function hex2str($x) {
$s='';
foreach(explode("\n",trim(chunk_split($x,2))) as $h) $s.=chr(hexdec($h));
return($s);
}
//RFC-2144
$text = hex2str("0123456789ABCDEF");
//Section B.1 128-bit example
$key = hex2str("0123456712345678234567893456789A");
echo "RFC-2144 Section B.1 128-bit<BR>";
$enc = mcrypt_encrypt(MCRYPT_CAST_128,$key,$text,MCRYPT_MODE_ECB);
echo "ciphertext: " . str2hex($enc);
echo "<BR>";
//RFC-2144
//Section B.1 80-bit example
$key = hex2str("01234567123456782345");
echo "RFC-2144 Section B.1 80-bit<BR>";
$enc = mcrypt_encrypt(MCRYPT_CAST_128,$key,$text,MCRYPT_MODE_ECB);
echo "ciphertext: " . str2hex($enc);
echo "<BR>";
//RFC-2144
//Section B.1 40-bit example
$key = hex2str("0123456712");
echo "RFC-2144 Section B.1 40-bit<BR>";
$enc = mcrypt_encrypt(MCRYPT_CAST_128,$key,$text,MCRYPT_MODE_ECB);
echo "ciphertext: " . str2hex($enc);
echo "<BR>";
Expected result:
----------------
see RFC2144 Section B.1
Actual result:
--------------
see result of provided code.
--
Edit bug report at https://bugs.php.net/bug.php?id=62102&edit=1
--
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Thread (4 messages)
- nathanpust at hotmail dot com