<?php
/**********************************************
function get_rnd_iv ( $iv_len )
$iv = '' ;
$iv_len -- > 0 )
$iv .= chr ( mt_rand ( ) & 0xff );
$iv ;
md5_encrypt ( $plain_text , $password , $iv_len = 16 )
$plain_text .= "\x13" ;
$n = strlen ( $plain_text );
$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 );
$i < $n )
$block = substr ( $plain_text , $i , 16 ) ^ pack ( 'H*' , md5 ( $iv ) );
$enc_text .= $block ;
$iv = substr ( $block . $iv , 0 , 512 ) ^ $password ;
$i += 16 ;
base64_encode ( $enc_text );
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 );
$i < $n )
$block = substr ( $enc_text , $i , 16 );
$plain_text .= $block ^ pack ( 'H*' , md5 ( $iv ) );
$iv = substr ( $block . $iv , 0 , 512 ) ^ $password ;
$i += 16 ;
preg_replace ( '/\\x13\\x00*$/' , '' , $plain_text );
?>
<?php
include( 'md5.php' );
$plain_text = 'very secret string' ;
$password = 'very secret password' ;
"plain text is: [ ${ plain_text } ]<br />\n" ;
"password is: [ ${ password } ]<br />\n" ;
$enc_text = md5_encrypt ( $plain_text , $password );
"encrypted text is: [ ${ enc_text } ]<br />\n" ;
$plain_text2 = md5_decrypt ( $enc_text , $password );
"decrypted text is: [ ${ plain_text2 } ]<br />\n" ;
?>
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