<?php
function get_rnd_iv($iv_len)
{
$iv = '';
while ($iv_len-- > 0) {
$iv .= chr(mt_rand() & 0xff);
}
return $iv;
}
function md2_encrypt($plain_text, $password, $iv_len = 16)
{
$plain_text .= "\x13";
echo "<br>".$plain_text;
$n = strlen($plain_text);
echo "<br>".$n;
if ($n % 16) $plain_text .= str_repeat("\0", 16 - ($n % 16));
$i = 0;
$enc_text = get_rnd_iv($iv_len);
echo "<br>".$enc_text;
$iv = substr($password ^ $enc_text, 0, 512);
echo "<br>".$iv;
while ($i < $n) {
$block = substr($plain_text, $i, 16) ^ pack('H*', md2($iv));
echo "<br>".$block;
$enc_text .= $block;
echo "<br>".$enc_text;
$iv = substr($block . $iv, 0, 512) ^ $password;
echo "<br>".$iv;
$i += 16;
}
$enc=base64_encode($enc_text);
echo "<br>".$enc;
return $enc;
}
function md2_decrypt($enc_text, $password, $iv_len = 16)
{
$enc_text = base64_decode($enc_text);
$n = strlen($enc_text);
$i = $iv_len;
$plain_text = '';
$iv = substr($password ^ substr($enc_text, 0, $iv_len), 0, 512);
while ($i < $n) {
$block = substr($enc_text, $i, 16);
$plain_text .= $block ^ pack('H*', md2($iv));
$iv = substr($block . $iv, 0, 512) ^ $password;
echo "<br>".$iv;
$i += 16;
}
return preg_replace('/\\x13\\x00*$/', '', $plain_text);
}/******************************************/
$plain_text = 'network security';
$password = 'very secret password';
echo "plain text is: [${plain_text}]<br />\n";
echo "password is: [${password}]<br />\n";
$enc_text = md2_encrypt($plain_text, $password);
echo "encrypted text is: [${enc_text}]<br />\n";
$plain_text2 = md2_decrypt($enc_text, $password);
echo "decrypted text is: [${plain_text2}]<br />\n";
?>
this is md5(hash code with encryption) code work for both md5 and SHA1
but generate error with md4.
help me in this code plz.........
i want hash funtion md4 with encryption and decryption.
