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Below is MD5-based block cypher ( MDC-like ), which works in 128bit CFB mode. It is very useful to encrypt secret data before transfer it over the network.
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<?php
/**********************************************
**
** MD5 block cypher
**
** Author..: leapinglangoor [ leapinglangoor@yahoo.co.in ]
** Date....: 30th Apr 2005
** version.: v1.00
**
** Desc....: Below is MD5-based block cypher ( MDC-like ),
** which works in 128bit CFB mode. It is very useful to
** encrypt secret data before transfer it over the network.
**
** $iv_len - initialization vector's length.
** 0 <= $iv_len <= 512
**
************************************************/
function get_rnd_iv( $iv_len )
{
$iv = '';
while ( $iv_len-- > 0 )
{
$iv .= chr( mt_rand( ) & 0xff );
}
return $iv;
}
function md5_encrypt( $plain_text, $password, $iv_len = 16 )
{
$plain_text .= "\x13";
$n = strlen( $plain_text );
if ( $n % 16 )
{
$plain_text .= str_repeat( "\0", 16 - ( $n % 16 ) );
}
$i = 0;
$enc_text = get_rnd_iv( $iv_len );
$iv = substr( $password ^ $enc_text, 0, 512 );
while ( $i < $n )
{
$block = substr( $plain_text, $i, 16 ) ^ pack( 'H*', md5( $iv ) );
$enc_text .= $block;
$iv = substr( $block . $iv, 0, 512 ) ^ $password;
$i += 16;
}
return base64_encode( $enc_text );
}
function md5_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*', md5( $iv ) );
$iv = substr( $block . $iv, 0, 512 ) ^ $password;
$i += 16;
}
return preg_replace( '/\\x13\\x00*$/', '', $plain_text );
}
?> | |
example.php:
| <?php
include( 'md5.php' );
$plain_text = 'very secret string';
$password = 'very secret password';
echo "plain text is: [${plain_text}]<br />\n";
echo "password is: [${password}]<br />\n";
$enc_text = md5_encrypt( $plain_text, $password );
echo "encrypted text is: [${enc_text}]<br />\n";
$plain_text2 = md5_decrypt( $enc_text, $password );
echo "decrypted text is: [${plain_text2}]<br />\n";
?> | |
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